Operator alternatives framework
Best Campaign Monitor alternatives in 2026 — when Campaign Monitor isn't the right pick (8 honest alternatives)
Campaign Monitor by Marigold is a paid partner. We surface it on the broader best-email-marketing comparison because it earns the rank for its ICP — not because of the commission. Beautifully-coded responsive templates, drag-and-drop visual editor, journeys (automation), segmentation, and transactional sending under the Marigold customer-engagement suite. For B2C and content-first B2B brands where brand consistency in the inbox is a competitive moat, Campaign Monitor is the structural default.
But four buyer constraints break the Campaign Monitor fit: (1) transactional email + SMS bundling is in scope (Campaign Monitor ships transactional via the broader Marigold platform, not under standard Lite / Essentials / Premier tiers), (2) deep marketing automation + native sales CRM is the wedge, (3) Shopify-native e-commerce flows are daily-driver, (4) cheapest volume pricing matters more than designer-grade template polish. This page is the honest framework for those constraints — when Campaign Monitor still wins, and when each of 8 alternatives fits better.
When Campaign Monitor is still the right pick
Before evaluating alternatives, confirm Campaign Monitor doesn't already fit your shape. Campaign Monitor is the structural default when any of these four describe your motion:
- Designer-grade template polish is your moat.
Beautifully-coded responsive templates + drag-and-drop visual editor are category-leading for B2C and content-first B2B brands. If brand consistency in the inbox is a competitive advantage — fashion, lifestyle, publishers, media properties, design-led B2B — Campaign Monitor earns the premium over every alternative on raw template polish. - Marigold suite bundling is part of your roadmap.
Campaign Monitor is now part of the Marigold customer-engagement suite — loyalty, SMS-CRM, relationship intelligence under one platform. If you're planning to scale beyond email-only into loyalty or omnichannel customer engagement, Marigold-bundled roadmap is the wedge. Brevo / MailerLite / Mailchimp are email-only. - B2C and content-first B2B brand-consistency-first motion.
For brands where the email visual is the product — fashion drops, lifestyle editorial, publisher newsletters, agency portfolio emails — Campaign Monitor's design surface is the wedge. Alternatives win on automation, volume pricing, or e-commerce flows, but none match Campaign Monitor on raw design-led B2C polish. - Transactional + marketing in one workspace under Marigold.
For teams scaling beyond email-only, the Marigold platform bundles transactional sending with marketing under one tenant. For pure marketing + transactional in a single small workspace, Brevo Starter at $9/mo is cheaper — but Brevo doesn't have the wider Marigold suite roadmap.
Want to try Campaign Monitor?
If any of those four describe your shape, stay on Campaign Monitor.
Campaign Monitor is the structural default for B2C and content-first B2B brands where designer-grade template polish + Marigold-suite optionality is the wedge. Lite at ~$11/mo (2.5K contacts, 12 emails/mo cap) covers validation; most teams land on Essentials at ~$19/mo (unlimited sends + journeys + analytics) within 60 days. Premier at ~$29/mo adds advanced segmentation + send-time optimization for design-led teams scaling past 25K contacts.
Stick with Campaign Monitor →Affiliate link — StackSwap earns a commission if you sign up for Campaign Monitor by Marigold. We only partner with tools we'd recommend anyway.The 8 alternatives — when each one structurally wins
Each alternative is mapped to the specific buyer constraint where it beats Campaign Monitor. Use the "wins when / loses when" framing to match the right alternative to your actual problem.
1. Brevopartner
Email + transactional + SMS bundled under one tenantPricing: Free 300/day (unlimited contacts) · Starter $9/mo (20K emails) · Business $18/mo · BrevoPlus custom
Best for: SMB and bootstrapped B2B teams who want marketing email + transactional sending + SMS + a basic CRM under one contract — without paying per-contact pricing. The structural sweet spot is 1-50K contact lists where send volume is moderate and you'd otherwise be stitching Mailchimp + Postmark + Twilio + HubSpot Free together.
Wins when: Transactional email is in scope — Brevo bundles transactional API + marketing automation in the same workspace. Campaign Monitor doesn't ship transactional under standard tiers. SMS/WhatsApp matters — Brevo bundles both at every paid tier. Email-volume pricing (not per-contact) wins for large lists with moderate sends — at 25K contacts Brevo Starter is materially cheaper than Campaign Monitor Essentials.
Loses when: Designer-grade template polish is non-negotiable — Campaign Monitor's beautifully-coded responsive templates + drag-and-drop editor have a 10+ year head start in design-led B2C marketing. Brand consistency in the inbox is a competitive moat for your business — Brevo's template library is functional but not design-led. Marigold suite bundling (loyalty, SMS-CRM, relationship intelligence) is part of your roadmap — Brevo doesn't have the wider customer-engagement suite.
Honest strength: Cheapest legitimate entry tier in the category — Starter at $9/mo with 20K emails/mo and no daily cap. Email + transactional + SMS + basic CRM under one contract. Free tier (300/day with unlimited contacts) is genuinely useful for validation. Volume-priced rather than per-contact wins for large lists with moderate engagement.
Honest weakness: Template polish caps below Campaign Monitor's design-led library. CRM is a basic contact + deal tracker, not a real CRM. Automation surface lighter than ActiveCampaign. Brand recognition narrower than Mailchimp in agency conversations.
When to pick Brevo: You're a 1-50K contact SMB or bootstrapped B2B team where transactional sending, SMS, and email-volume pricing matter more than designer-grade template polish. Brevo Starter at $9/mo is the structurally cheapest path to an omnichannel email stack — and you'd otherwise be paying for 3-4 separate tools.
2. Kitpartner
Creator-first email + paid newsletters + Creator NetworkPricing: Newsletter Free (up to 10K subs, no automation) · Creator $33/mo · Pro $66/mo (verified May 2026)
Best for: Solo creators, course operators, newsletter publishers, B2B founders running a personal-brand newsletter, and authors selling digital products. The structural sweet spot is tag-based subscriber motion (one subscriber, many tags) where sequences, paid newsletters, and Creator Network cross-promotion matter more than designer-grade template polish.
Wins when: Creator economy motion — paid newsletters, course launches, info-product funnels, sponsor placements. Kit ships paid-newsletter monetization via Kit Stripe, Creator Network cross-promotion, and tag-based subscriber model that Campaign Monitor doesn't have. Free tier covers up to 10K subscribers with broadcast emails + landing pages — the most generous free tier for creator-led motions in the category.
Loses when: B2C brand-consistency-first motion — Kit's template library is minimalist by design (text-forward, conversion-driven) and doesn't match Campaign Monitor's designer-grade polish. B2B sales-led nurture with lifecycle stages tied to a CRM — Kit isn't a marketing automation platform in the ActiveCampaign sense. Transactional sending — Kit doesn't ship it.
Honest strength: Best-in-class for creator-economy motions. Tag-based subscriber model (one sub, many tags) beats list-duplication for content-led businesses. Paid newsletters via Kit Stripe + Creator Network cross-promotion. Real free tier up to 10K subscribers. Visual automation builder. Native landing pages + opt-in forms.
Honest weakness: Template library is minimalist by design — not for B2C brands where designer-grade visuals are the moat. No transactional sending. No SMS / WhatsApp. Caps below ActiveCampaign on automation depth, below Klaviyo on Shopify-deep e-commerce, below Mailchimp on tiny-list ergonomics.
When to pick Kit: You're a creator, course operator, newsletter publisher, or solo B2B founder where content-led monetization (paid newsletters, sequences, info products) is the motion. Kit's free tier validates the model up to 10K subscribers; Creator at $33/mo unlocks automation + integrations once you outgrow free.
3. Mailchimp
SMB default with category-leading brand recognition + tiny-list free tierPricing: Free 500 contacts · Essentials $13/mo · Standard $20/mo · Premium $350/mo (verified May 2026)
Best for: Solo and small DTC brands under 25K contacts where brand recognition, agency familiarity, Intuit/Shopify integrations, and the most polished out-of-the-box template library are the wedge. The structural sweet spot is 0-5K contact lists where Mailchimp's free tier (500 contacts) covers validation and Essentials at $13/mo handles ongoing growth.
Wins when: Tiny-list free-tier validation matters — Mailchimp Free at 500 contacts is the most accessible no-cost entry to legitimate email marketing. Brand recognition + agency familiarity matter — "we use Mailchimp" is the path of least resistance with freelance designers and contractors. Shopify integration is shallow but workable — better than Campaign Monitor for non-e-commerce-first SMB DTC.
Loses when: Per-contact pricing escalates harshly above 25K contacts — Standard at $20/mo is for 500 contacts; the math scales fast. Designer-grade template polish + brand consistency is the moat — Campaign Monitor's beautifully-coded templates still beat Mailchimp on design-led B2C inbox quality. Automation depth — Mailchimp's automation surface is shallow vs ActiveCampaign or Brevo.
Honest strength: Most recognizable brand in the category — frictionless agency/freelancer onboarding. Real free tier up to 500 contacts. Polished out-of-the-box template library. Shopify integration. Intuit ownership adds QuickBooks/POS integrations for local SMB.
Honest weakness: Per-contact pricing escalates harshly above 25K contacts. Automation surface is shallow compared to ActiveCampaign or Brevo. Intuit ownership has slowed product velocity vs. Klaviyo/Brevo/ActiveCampaign. E-commerce features lag Klaviyo on Shopify. No native SMS bundle (it's a paid add-on). Designer-grade template polish trails Campaign Monitor.
When to pick Mailchimp: You're a solo or small DTC brand under 25K contacts where Mailchimp's ease of use + free tier + brand recognition is the wedge — and you don't need deep automation, omnichannel, or designer-grade brand consistency in the inbox. Above 25K contacts, switch the math to Brevo (volume pricing) or upgrade to Campaign Monitor Essentials (design polish).
4. ActiveCampaignpartner
Marketing automation depth + native sales CRM bundledPricing: Starter $15/mo · Plus $49/mo · Pro $79/mo · Enterprise from $145/mo (per 1K contacts, scales by list size)
Best for: 2-15 person GTM teams running automation-led lifecycle marketing as the centerpiece — multi-branch conditional flows, goal-based automation, lead scoring, predictive sending, and a real sales CRM tied to the same tenant. The structural sweet spot is bootstrapped B2B SaaS, agency / consulting motions, and SMB sales teams that would otherwise stitch Campaign Monitor + a separate CRM.
Wins when: Automation depth is daily-driver — ActiveCampaign's visual workflow builder is the deepest in the SMB-to-mid-market range. Native sales CRM is in scope — Plus tier ($49/mo) bundles a real CRM tied to marketing automation under one tenant. Goal-based automation + lead scoring + branching logic is your operating motion — Campaign Monitor's journeys are competent but lighter on conditional depth.
Loses when: Designer-grade template polish + brand consistency is the moat — Campaign Monitor still wins on beautifully-coded responsive templates and drag-and-drop visual design. Per-contact pricing scales harshly above ~25K contacts on Plus and above. B2C brand-led motion where the email visual is the product — ActiveCampaign is automation-first, design-second.
Honest strength: Deepest marketing automation surface in the SMB-to-mid-market range. Native sales CRM bundled from Plus tier. AI Lab (100K+ business research, 8.3M campaign data) ships at every tier. Multi-branch conditional flows, goal-based automation, lead scoring, predictive sending (Pro+).
Honest weakness: Per-contact pricing escalates above 25K contacts. UI complexity surfaces at Plus tier and above — non-technical operators often need help. Template design trails Campaign Monitor on B2C polish. Marketing and CRM are separate SKUs above Starter, which inflates the tier numbers.
When to pick ActiveCampaign: You're a 2-15 person GTM team where marketing automation + native sales CRM under one tenant is the wedge. ActiveCampaign Starter at $15/mo onboards a small team; Plus at $49/mo adds the CRM. For most automation-led B2B SMB motions, ActiveCampaign is the structural answer.
5. Klaviyo
Shopify-native e-commerce flows + revenue attributionPricing: Free up to 250 contacts (500 emails/mo) · Email starts ~$20/mo (501-1.5K contacts) · scales by contact tier
Best for: Shopify, BigCommerce, and WooCommerce DTC brands at $250K-$10M+ GMV where abandoned cart, browse abandonment, post-purchase, win-back, and product recommendation flows are tied directly to product + order data. The structural sweet spot is e-commerce brands optimizing revenue per send with predictive CLV, recommended products, and channel attribution.
Wins when: Shopify-deep e-commerce is the entire motion — Klaviyo's native Shopify integration, predictive CLV, recommended products, and revenue-per-send reporting beat every alternative for DTC. Revenue attribution per campaign is daily-driver — Klaviyo's e-commerce-specific reporting attributes every send to actual order revenue. SMS bundled in the same product, not stitched.
Loses when: You're not running e-commerce — Klaviyo's wedge depends on the native e-com data layer. Pricing matters more than revenue lift — Klaviyo is the most expensive email tool in this list at comparable list sizes; Brevo and MailerLite are 3-5x cheaper at the same contact count. B2B + content-first brands — Klaviyo's product surface is e-commerce-shaped, not lifecycle-marketing-shaped.
Honest strength: Best-in-class Shopify-native depth — predictive CLV, recommended products, recommended segments, channel attribution. SMS + email + reviews under one tenant. Real free tier (250 contacts + 500 emails/mo). E-commerce-specific reporting attributes every send to revenue.
Honest weakness: Per-contact pricing is the most expensive in the category at comparable list sizes. Product surface assumes e-commerce — non-Shopify B2B / B2C content motions overprovision. Designer-grade B2C brand-consistency-first motions (where the email visual is the product) lean toward Campaign Monitor for raw template polish.
When to pick Klaviyo: You're a Shopify / BigCommerce / WooCommerce DTC brand at $250K-$10M+ GMV where revenue-per-send and abandoned-cart / browse-abandonment / post-purchase flows are the operating motion. Klaviyo is the structural answer for that shape. Don't pick it for B2B content-first motion or non-e-commerce SMB.
6. GetResponsepartner
Email + webinars + funnels + landing pages bundled in one platformPricing: Starter $19/mo · Marketer $59/mo · Creator $69/mo · Enterprise custom (annual billing ~18% off)
Best for: Solo operators, course creators, coaches, agencies, and SMB B2B teams where bundled webinar hosting + email + sales funnels + landing pages + courses under one contract is the wedge. The structural sweet spot is 1-10 person teams who would otherwise pay for Campaign Monitor + Zoom Webinars + a separate funnel builder.
Wins when: Webinars are core demand-gen — GetResponse bundles native webinar hosting (100 attendees on Creator tier) inside the email platform. Course creation / membership tiers / paid digital products — Creator tier ($69/mo) ships a course builder, premium newsletters, and website builder under one tenant. Bundling 4-5 line items (email + webinars + funnels + landing pages + courses) into one contract is structurally cheaper than stitching them.
Loses when: Designer-grade email template polish — Campaign Monitor's design library is materially stronger. You don't run webinars or courses — the bundle's wedge disappears and you're paying for surfaces you won't use. You want best-in-class email + automation as standalone tools — ActiveCampaign or Brevo go deeper individually.
Honest strength: Bundled webinars + email + funnels + landing pages + courses under one contract at $69/mo Creator tier. Reduces 4-5 typical SaaS line items to one vendor relationship. Solid email automation. Strong international reach (multi-language, multi-currency).
Honest weakness: Email template design trails Campaign Monitor on B2C polish. Webinar hosting is functional but lighter than Zoom Webinars or Demio for production-grade events. Brand recognition narrower in B2B SMB circles. Marketer tier ($59) lands close to ActiveCampaign Plus without matching ActiveCampaign's automation depth.
When to pick GetResponse: You're a 1-10 person operator (creator, coach, agency, SMB B2B) running webinars + email + funnels + courses as a bundled motion. GetResponse Creator at $69/mo collapses 4-5 line items into one tenant. For pure email + designer-grade templates, Campaign Monitor still wins.
7. Constant Contact
Small-business baseline + event/survey features + phone supportPricing: Lite $12/mo · Standard $35/mo · Premium $80/mo (scales with contacts)
Best for: Local-business operators, nonprofits, event-led small businesses, and SMB owners who would rather call support than read docs. The structural sweet spot is teams under 10K contacts where event registration, ticketing, RSVP tracking, and post-event surveys are part of the motion.
Wins when: Events are core to your motion — Constant Contact ships event registration, ticketing, RSVP tracking, and post-event surveys inside the email platform. You want phone support — Constant Contact's customer support reputation is materially stronger than Campaign Monitor / Brevo / Mailchimp / ActiveCampaign. Local-business operator profile — restaurants, nonprofits, fitness studios, faith communities are the bullseye.
Loses when: You're not running events — the bundle's wedge disappears and you're paying for surfaces you don't use. Designer-grade template polish + brand consistency is the moat — Campaign Monitor wins on visual design. Automation depth — Constant Contact's automation is shallow vs ActiveCampaign / Brevo. Large lists — per-contact pricing escalates fast above 10K.
Honest strength: Best-in-class phone support reputation in the category. Native event registration + ticketing + RSVP + post-event surveys. Long-standing brand with local-business / nonprofit market presence. Lite tier ($12/mo) is the cheapest legitimate entry for very small teams.
Honest weakness: Automation surface is light. Per-contact pricing punishes large lists. Pricing tiers escalate fast above 5K contacts. No native SMS bundle (paid add-on). Template design trails Campaign Monitor. Product velocity slower than the modern leaders.
When to pick Constant Contact: Events + email + post-event surveys are your primary motion and you'd rather call support than read docs. Constant Contact's bundle is purpose-built for that. For pure email + designer-grade templates, Campaign Monitor wins. For pure email + automation + volume pricing, Brevo or MailerLite are better fits.
8. MailerLite
Cheapest design-forward entry + clean SMB UXPricing: Free up to 1K subscribers (12K emails/mo) · Growing Business from $10/mo · Advanced from $20/mo · Enterprise custom
Best for: Solo operators, indie creators, small DTC brands, and SMB teams who want Campaign Monitor-style design polish at the cheapest legitimate entry tier in the category. The structural sweet spot is 1-25K subscriber lists where clean UX + drag-and-drop design + cheap entry pricing beats enterprise governance or Marigold-suite bundling.
Wins when: Cheapest design-forward entry tier — Free up to 1K subscribers + 12K emails/mo with a real drag-and-drop editor and clean templates. Growing Business at $10/mo (500 subs starter) is the cheapest paid tier with designer-grade visual editing. Clean SMB UX without the enterprise telephony / Marigold-suite overhead.
Loses when: Marigold suite bundling (loyalty, SMS-CRM, relationship intelligence) is part of your roadmap — MailerLite is email-only, no wider customer-engagement suite. Enterprise governance (granular admin, SSO, advanced procurement) at 50+ user scale — Campaign Monitor / Marigold wins. Transactional sending — MailerLite ships it but it's not the wedge.
Honest strength: Best-in-class clean UX for SMB email. Real free tier (1K subscribers + 12K emails/mo) more generous than Mailchimp Free or Campaign Monitor's gated trial. Growing Business at $10/mo is the cheapest design-forward paid tier in the category. Drag-and-drop editor competitive with Campaign Monitor on visual polish at SMB scale.
Honest weakness: Email-only — no Marigold-suite bundling (loyalty, SMS-CRM, relationship intelligence). Enterprise governance lighter than Campaign Monitor / Marigold. Brand recognition narrower than Mailchimp / Brevo / Campaign Monitor in agency conversations. Automation surface lighter than ActiveCampaign.
When to pick MailerLite: You're a solo operator, indie creator, or sub-25K subscriber SMB who wants Campaign Monitor-style design polish at the cheapest legitimate entry tier — and you don't need Marigold-suite bundling or enterprise governance. MailerLite Free up to 1K subs is the most generous validation tier; Growing Business at $10/mo is the cheapest paid design-forward email tool in the category.
Want to try Brevo?
If transactional + SMS + volume pricing is the wedge, start with Brevo Starter.
Brevo bundles marketing email + transactional API + SMS + WhatsApp + a basic CRM under one tenant. Free at 300/day with unlimited contacts validates the fit; Starter at $9/mo unlocks 20K emails/mo with no daily cap. For SMB and bootstrapped B2B teams where transactional sending and SMS matter as much as marketing, Brevo at half the cost of Campaign Monitor Essentials is the structural answer.
Try Brevo →Affiliate link — StackSwap earns a commission if you sign up for Brevo. We only partner with tools we'd recommend anyway.Quick decision matrix — pick by buyer constraint
| Your buyer constraint | Right answer | Pricing | Key trade vs Campaign Monitor |
|---|---|---|---|
| Transactional + SMS bundled + cheapest volume pricing | Brevo Starter | $9/mo | Bundled transactional + SMS vs. lighter template design polish |
| Creator economy (paid newsletters, courses, info products) | Kit Creator | $33/mo (Free up to 10K subs) | Tag-based + Creator Network + paid newsletters vs. B2C visual polish |
| Tiny-list free-tier validation + brand recognition | Mailchimp Essentials | $13/mo (Free 500 contacts) | Brand recognition + free tier vs. designer-grade template polish |
| Automation depth + native sales CRM in one tenant | ActiveCampaign Plus | $49/mo (per 1K contacts) | Automation + CRM depth vs. B2C template design polish |
| Shopify DTC + revenue-per-send attribution | Klaviyo Email | ~$20/mo (Free 250 contacts) | Shopify-native flows + attribution vs. cheaper non-e-commerce motion |
| Webinars + email + funnels + courses bundled | GetResponse Creator | $69/mo | Bundled webinars + courses vs. designer-grade template polish |
| Events + RSVP + phone support (local SMB / nonprofit) | Constant Contact Standard | $35/mo | Events bundle + phone support vs. designer-grade templates + automation |
| Cheapest design-forward entry + clean SMB UX | MailerLite Growing Business | $10/mo (Free 1K subs) | Cheapest design-led entry vs. Marigold suite bundling roadmap |
How to evaluate before committing
Three-step pressure test before any switch — Campaign Monitor's switching cost is real (domain re-authentication, template rebuild, journey re-creation, list re-import), so make sure the alternative actually beats Campaign Monitor by >15% on your binding constraint before committing.
- Identify your binding constraint, then trial 1-2 matched alternatives. Brevo Free (300/day) for transactional + SMS, Kit Free (up to 10K subs) for creator motion, MailerLite Free (1K subs) for cheaper design-forward, ActiveCampaign 14-day trial for automation + CRM, Klaviyo Free (250 contacts) for Shopify DTC. Send a real campaign to your real list. Confirm templates render across Gmail / Outlook / Apple Mail, deliverability hits inbox (run Mail Tester or Litmus), automation flows fire correctly.
- Test the binding-constraint surface specifically. If transactional is in scope, send 100 real transactional emails through the candidate's API and verify inbox placement. If brand polish is the wedge, build your top 3 branded templates in each candidate and compare side-by-side in the inbox. If automation is the wedge, build a 4-step branching nurture and verify the conditions execute. If Shopify e-commerce is the wedge, wire Klaviyo to your store and confirm order-data segmentation works.
- Calculate TCO at your projected 12-month list growth. Campaign Monitor's tier pricing rewards stable design-led motion; Brevo's email-volume pricing rewards large lists with moderate sends; ActiveCampaign / Klaviyo / Mailchimp per-contact pricing rewards smaller lists with high engagement. If your list will 5x in 12 months and design polish is your moat, Campaign Monitor wins long-term. If your list will 5x and design is nice-to-have, Brevo's volume model wins. The alternative has to beat Campaign Monitor by >15% on your binding constraint to justify 4-8 weeks of template rebuild and partial productivity loss.
Related comparisons + deep-dives
- Best email marketing for small business 2026 — category hub with all 8+ vendors ranked by motion
- Campaign Monitor by Marigold review — full operator take on designer-grade B2C email
- Brevo review — bundled email + transactional + SMS + basic CRM at $9/mo Starter
- Kit review — creator-first email with tag-based subscribers + paid newsletters
- ActiveCampaign review — automation depth + native sales CRM bundled in one tenant
- GetResponse review — bundled webinars + email + funnels + courses
- Best Brevo alternatives 2026 — when bundled volume-priced email doesn't fit
- Best GetResponse alternatives 2026 — when the webinar bundle doesn't fit
- Best Kit alternatives 2026 — when creator-economy email isn't the shape
- Cancel Mailchimp — the operator playbook for the per-contact pricing trap
- Are you wasting money on Mailchimp? — tier overprovision check
- StackScan — model your full marketing stack with email platform included
FAQ
Canonical URL: https://stackswap.ai/best-campaign-monitor-alternatives-2026. Disclosure: StackSwap is a Campaign Monitor by Marigold affiliate. We rank Campaign Monitor for its ICP in our broader best-email-marketing-for-small-business comparison because it earns the rank — not because of the commission. The alternatives in this article (Brevo, Kit, ActiveCampaign, GetResponse are also partners; Mailchimp, Klaviyo, Constant Contact, MailerLite are not) are positioned honestly for the specific buyer constraints where Campaign Monitor doesn't fit. Pricing verified May 2026 — email marketing tiers change frequently; double-check the vendor's pricing page before committing.