Mailmodo vs Plunk
An independent, review-free comparison compiled by the SaaSTracker editorial team. Both products are profiled in full, and neither can pay for placement here.
The short answer
Both sides assessedMailmodo compared with Plunk
Plunk is open source, charges $0.001 per email with unlimited contacts and no monthly fee, and can be self-hosted. Mailmodo charges $149 a month for 500 contacts and 2,000 sends. On raw sending economics the comparison is absurd, and on interactivity Plunk offers nothing. Plunk suits a developer team that wants cheap programmable email; Mailmodo suits a marketer betting specifically on AMP conversion.
Plunk compared with Mailmodo
Mailmodo charges $149 a month for 500 contacts and 2,000 sends and gives you interactive AMP email that Plunk cannot do. Plunk charges $0.001 per email with unlimited contacts, so the same 2,000 sends cost two dollars. Unless in-email interactivity is a measured revenue driver for your audience, the economics are not close, and Plunk also unifies your transactional path which Mailmodo does not.
Choose Mailmodo if
Consumer-facing businesses with meaningful Gmail share on their list who run surveys, feedback requests, NPS, bookings, or quick-conversion campaigns often enough that removing the click-through step measurably changes revenue, and who can absorb a $149 to $199 monthly floor at small list sizes.
Choose Plunk if
SaaS teams, indie hackers, and developer-led products that want transactional email, onboarding automations, and broadcasts on one contact record at usage-based pricing, and who either value open source on principle or want the option to self-host and stop paying per email entirely.
Side by side
13 attributes| Attribute | Mailmodo | Plunk |
|---|---|---|
| Category | Automation | Automation |
| Starting price | $149 per month for 500 contacts (Lite, billed annually) (free trial) | $0 (free tier), then $0.001 per email (free plan available) |
| Pricing model | Tiered subscription metered on contacts and email sending credits simultaneously, with seat, active-journey, custom-domain, and API rate limits set per tier. Annual billing saves 20 percent against monthly. | Usage-based pricing at a flat rate per email with unlimited contacts, no monthly fee, no feature tiers, and a free self-hosted option. |
| Free plan | No | 1,000 emails a month with no credit card required and every feature included; the only limitation is Plunk branding on messages. |
| Free trial | Self-serve free signup is offered from the site; the pricing page does not publish a fixed trial length. | No separate trial; the free tier is permanent and functionally complete. |
| Best for | Consumer-facing businesses with meaningful Gmail share on their list who run surveys, feedback requests, NPS, bookings, or quick-conversion campaigns often enough that removing the click-through step measurably changes revenue, and who can absorb a $149 to $199 monthly floor at small list sizes. | SaaS teams, indie hackers, and developer-led products that want transactional email, onboarding automations, and broadcasts on one contact record at usage-based pricing, and who either value open source on principle or want the option to self-host and stop paying per email entirely. |
| Setup time | A day to import contacts, authenticate a domain, and send a static campaign. Longer for the AMP path, because Google, Yahoo, and Mail.ru whitelisting are separate approval processes with their own turnaround times and nothing interactive renders until they complete. | An hour on the hosted service to authenticate a domain, import contacts, and send. Half a day to a day for a self-hosted deployment including Docker Compose, PostgreSQL, Redis, and SES verification. |
| Learning curve | Low for the editor and journey builder, which are conventional. The genuinely new learning is strategic rather than technical: working out which of your campaigns benefit from in-email interaction and which are just newsletters that do not. | Low for developers and moderate for anyone else. The concepts are small: contacts, events, workflows, campaigns, and segments. The main adjustment is thinking in events rather than lists, which is the correct habit anyway. |
| Platforms | Web application, REST API, Transactional email API, Hosted AMP and HTML email rendering | Web application, REST API, Node.js and Python SDKs, Self-hosted via Docker Compose |
| Compliance | GDPR tooling for consent and data requests, CAN-SPAM compliant unsubscribe handling, SOC 2 posture published by the vendor | GDPR compliant with EU hosting on the managed service, CAN-SPAM compliant unsubscribe handling |
| Founded | 2020 | 2022 |
| Headquarters | San Francisco, United States, with operations in Bengaluru, India | Europe |
| Ownership | Venture-backed | Independent and bootstrapped, with the product open sourced under AGPL-3.0 |
Strengths and limitations
Mailmodo
Strengths
- Genuinely differentiated: no mainstream competitor makes interactive AMP email practical for a non-technical marketer, and building it yourself is not realistic.
- The in-email form and rating blocks solve a real measurable problem, and response rates on feedback and survey campaigns improve materially where AMP renders.
- Automatic HTML fallback means the interactive layer never breaks the campaign for unsupported clients, so the downside is bounded.
- Mailmodo handles the fiddly Google, Yahoo, and Mail.ru whitelisting process rather than leaving it to you, which is a real service.
Limitations
- Pricing is high and multiply constrained: $149 a month buys one seat, one journey, 500 contacts, and 2,000 sends, which is a worse envelope than tools costing a third as much.
- AMP only renders in Gmail, Yahoo Mail, and Mail.ru, so the differentiator reaches a fraction of most lists and none of an Outlook-heavy B2B audience.
- The 500 active contacts per journey cap on Lite and Pro is a hard limit unrelated to your total contact count and is easy to miss when comparing plans.
- Email only: no SMS, no push, no in-app messaging, so any multi-channel lifecycle programme needs a second platform.
Plunk
Strengths
- Transactional and marketing email on one contact record with one sending identity, which removes an entire category of reconciliation and reputation problems.
- Unlimited contacts with billing purely on emails sent, which is the most sensible pricing model in this category and dramatically cheaper for large lists sent to infrequently.
- Every feature on every plan with no gating, so the free tier is a complete product rather than a demonstration.
- Fully open source under AGPL-3.0 with more than 5,000 GitHub stars, so you can audit exactly what happens to your data and fork it if the project stops.
Limitations
- Email only. No SMS, no push, no in-app messaging, and no orchestration across channels, so any multi-channel programme needs a second vendor.
- No compliance certification, no SLA, and no enterprise support, which rules Plunk out wherever procurement has a checklist.
- The hosted service is operated by one person with no outside funding, which is a real continuity risk for anything in a transactional critical path.
- No landing pages, forms, popups, or lead scoring, so the acquisition side of marketing has to live somewhere else entirely.
Pricing compared
Mailmodo
Tiered subscription metered on contacts and email sending credits simultaneously, with seat, active-journey, custom-domain, and API rate limits set per tier. Annual billing saves 20 percent against monthly.
- Lite$149
- Pro$199
- MaxCustom
Measured on conventional capability per dollar, Mailmodo is poor value: $149 a month buys 500 contacts, 2,000 sends, one seat, and one journey, where GetResponse Marketer gives unlimited sends, five seats, and unlimited workflows for around $59, and EngageBay gives a whole CRM and helpdesk besides. Modelled at 5,000 contacts you are into higher tiers on a meter that charges for both list and volume, and at 50,000 contacts you are almost certainly negotiating a Max quote. The only sound reason to accept that premium is a measured conversion lift from interactive email on your specific audience. That lift is real for feedback, surveys, bookings, and quick promotions on Gmail-heavy consumer lists, and close to zero for a B2B list full of Outlook users. Test before you commit to a year.
Plunk
Usage-based pricing at a flat rate per email with unlimited contacts, no monthly fee, no feature tiers, and a free self-hosted option.
- Free$0
- Pay as you go$0.001
- Self-hosted$0 licence
Plunk is the cheapest credible option in this category by a wide margin, and the pricing model is the reason. A product with 5,000 users sending four emails each a month is 20,000 emails, which costs $20 on the hosted service and effectively nothing self-hosted; a per-contact platform at that list size would charge somewhere between $50 and $250. A product with 50,000 users sending the same frequency is 200,000 emails at $200 hosted, where GetResponse, EngageBay, or HubSpot at that contact count would all charge several hundred to a few thousand. Self-hosting reduces the 200,000-email figure to roughly $20 of SES plus a small server. The thing you are giving up is not capability so much as assurance: no SOC 2, no SLA, no support contract, no multi-channel, and a hosted service run by one person. For an indie SaaS or a developer-led product, that trade is usually obviously worth making. For a company whose procurement asks for a security questionnaire, it is not.
Editorial verdict on each
Mailmodo
InnovationMailmodo is a single good idea executed properly and priced aggressively. Interactive email genuinely works where it renders, the editor makes AMP accessible to people who would never hand-write it, the HTML fallback bounds the risk, and having the vendor handle Google, Yahoo, and Mail.ru whitelisting removes real friction. Against that, $149 a month buys 500 contacts, 2,000 sends, one seat, and one journey, which is a fraction of what GetResponse or EngageBay give you for a third of the money, and the differentiator does not reach Apple Mail or Outlook at all. Buy it if you have a Gmail-heavy consumer list and a specific conversion problem that lives in the gap between the inbox and the landing page, and prove the lift with a test before you sign an annual contract. Do not buy it as a general-purpose marketing automation platform, because judged that way it is expensive and narrow.
Read the full Mailmodo profilePlunk
Plunk is the most quietly sensible piece of pricing in this whole category. Unlimited contacts, a flat tenth of a cent per email, every feature on every plan, transactional and marketing unified on one record, and a fully open-source codebase you can self-host on a Docker Compose file with your own SES account. For an indie SaaS or a developer-led product, the value is not close: a list size that would cost a few hundred dollars a month on a per-contact platform costs twenty dollars here, and self-hosting takes it lower still. The limits are real and should be stated plainly. It is email only, there is no SOC 2 or SLA, and the hosted service is run by one person with no funding, which is a genuine dependency for anything transactional. But the open-source licence is the mitigation that makes the risk tolerable, because the exit is a deployment rather than a migration. Take it if you are technical, cost-sensitive, and email is enough.
Read the full Plunk profileMailmodo profile last reviewed 2026-08-22; Plunk last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.