Listmonk is a free, AGPL-licensed, self-hosted newsletter and mailing list manager that runs as a single Go binary backed by PostgreSQL. We rate it 89/100 — for technical teams, indie creators, and bootstrapped SaaS founders who can run a server and connect an SMTP relay, it is the strongest open-source alternative to Mailchimp, Brevo, and ConvertKit on the market in 2026.

What is Listmonk?

Listmonk is an email and messaging campaign platform built by Kailash Nadh (CTO of Zerodha) that you self-host on your own server. The first public commit landed on June 26, 2019, and as of April 25, 2026 the project sits at 19,621 GitHub stars, 2,008 forks, and version v6.1.0 (released March 29, 2026). The repository is officially listed under the topics newsletter, mailing-list, email-marketing, and self-hosted.

Architecturally, Listmonk is one Go binary that bundles the admin dashboard, REST API, campaign engine, multi-SMTP queue, and a Vue + Buefy frontend. It pairs with a single PostgreSQL database — nothing else. There is no Redis, no separate worker process, no message broker. That is the entire point: you can run a production newsletter that handles millions of subscribers from one VPS, with the binary peaking at roughly 57 MB of RAM during a campaign send, according to the project's own benchmark of a 7+ million email production run.

Listmonk dashboard showing campaign analytics, subscriber lists, and send queue — The Listmonk admin dashboard — campaigns, subscribers, lists, templates, analytics, and the SMTP queue all live behind one login.

Key Features of Listmonk

Single binary, single database: One Go executable plus PostgreSQL is the entire stack. The Docker image is around 110 MB, install is two commands (--new-config then --install), and there are official builds for Linux, macOS, Windows, FreeBSD, NetBSD, and OpenBSD.
Multi-SMTP, multi-threaded queue: You can plug in any number of SMTP providers (Amazon SES, SendGrid, Mailgun, Postmark, your own Postfix relay) and Listmonk will round-robin or rate-limit across them with per-server concurrency, retry, and sliding-window throttling. Sub-second send rates are routine on a $5/month VPS.
SQL-powered subscriber segmentation: Lists support single and double opt-in, and queries are written in raw SQL against a documented subscribers schema. There is no point-and-click visual segment builder — the trade-off is that any segment Postgres can express, Listmonk can target.
Go templating with 100+ functions: Subject lines and bodies are full Go templates, so you can branch on attributes, format dates, and slot in dynamic content. Compose in a drag-and-drop visual builder, a WYSIWYG editor, Markdown, raw HTML, or plain text — all four are first-class.
Transactional API: A single POST /api/tx endpoint sends arbitrary one-off messages to a subscriber using a saved template. The same Messengers abstraction can fan out to SMS, WhatsApp, FCM push, Slack, Discord, or any HTTP webhook — not just SMTP.
Built-in analytics: Per-campaign opens, clicks, top links, bounces, unsubscribes, and time-series charts are rendered in the dashboard with no third-party tracker. Privacy controls let subscribers export, wipe, or block their own data — useful for GDPR.
OIDC SSO and RBAC: Multiple OIDC providers (Google, GitHub, Authentik, Keycloak), granular roles, and scoped API tokens. Password auth can be disabled entirely, which is rare for self-hosted tools at this scale.
Media library with S3 backend: Image and asset uploads go to local disk or any S3-compatible store (R2, MinIO, B2). Inline image embedding works without a CDN.

Listmonk built-in campaign analytics with opens, clicks, top links, and bounce rates — Built-in campaign analytics — no Mixpanel, no Google Analytics, no third-party tracker required.

What Users Say About Listmonk

Sentiment in self-hosting communities is overwhelmingly positive. The most upvoted threads on r/selfhosted and r/sysadmin describe Listmonk as "the only open-source ESP I would actually trust at scale," and the original Hacker News launch thread drew specific praise for the lightweight resource footprint and the fact that the project ships a real REST API rather than treating the API as an afterthought. Bootstrapped indie hackers on Indie Hackers and X repeatedly cite per-email cost as the primary motivation — with Amazon SES at $0.10 per 1,000 emails, a list of 100,000 subscribers costs roughly $10 per send versus $300+ on Mailchimp.

The most common complaints, repeated across GitHub issues and review sites: (1) deliverability is your problem, not Listmonk's — the software does not handle SPF, DKIM, DMARC, IP warming, or reputation management, and several users report bounce-handling edge cases (issue #1928) where non-existent addresses fail to register as bounces; (2) the setup curve is steep for non-technical users — a YunoHost forum thread notes the official install docs assume working knowledge of Postgres, systemd, and reverse proxies; (3) the SQL-first segmentation is powerful but unfriendly for marketing operators used to drag-and-drop builders. Maintainer Kailash Nadh is known for fast issue triage but is also explicit that the scope stays tight — no built-in MTA, no marketing automation flows.

Listmonk Pricing

Listmonk itself is free and open source under the AGPL-3.0 license. There is no paid tier, no hosted SaaS run by the maintainer, no per-subscriber fee, and no telemetry. Your real costs are the server you self-host on plus whatever your SMTP provider charges per email.

Plan	Price	Key Limits
Self-hosted (only option)	$0	Unlimited subscribers, lists, campaigns, and templates. AGPLv3 — you must publish source modifications if you offer Listmonk as a network service.
Typical VPS hosting	$5 – $20 / month	A 1 GB RAM Hetzner CX11 or DigitalOcean basic droplet handles 100k+ subscribers comfortably.
SMTP cost (Amazon SES)	$0.10 per 1,000 emails	The cheapest reliable option. SendGrid, Mailgun, and Postmark are 5–10× more expensive at scale.

For a 50,000-subscriber list sending one campaign per week, total cost is roughly $5 server + $20 SES = $25/month. The same list on Mailchimp's Standard plan is $350/month at the time of writing.

Listmonk template editor with Go templating, drag-and-drop builder, and HTML view — Template authoring: visual drag-and-drop builder, WYSIWYG, Markdown, and raw HTML modes — with full Go template expressions in subject lines and bodies.

Who Should Use Listmonk?

Best for: Bootstrapped SaaS founders, indie newsletter writers, agencies running campaigns for multiple clients, technical content creators with 10k–500k subscribers, and privacy-focused organisations that cannot send subscriber data to a US-based ESP. If you can SSH into a VPS and configure DKIM records, Listmonk will save you four figures a year.

Not ideal for: Marketing teams that need drag-and-drop automation flows, A/B test orchestration, CRM integrations, or visual customer journeys — those are out of scope by design. Also skip Listmonk if you do not want responsibility for IP reputation, deliverability monitoring, or PostgreSQL backups; a managed ESP is genuinely the better answer for that use case.

Pros and Cons

Pros:

One-binary install with PostgreSQL as the only dependency — a fresh deploy takes under 10 minutes.
Production-grade performance: the maintainer has documented a 7+ million email send peaking at 57 MB RAM and a fraction of a single CPU core.
Cost structure is unbeatable above 5,000 subscribers — pay only your SMTP provider, not a per-subscriber tax.
Active, responsive maintainer with a clear public roadmap and 19,621 GitHub stars worth of community testing.
First-class transactional API and Messengers abstraction for SMS, WhatsApp, FCM, and webhooks alongside email.

Cons:

Deliverability, IP warming, SPF/DKIM/DMARC, and bounce-loop diagnostics are entirely your problem.
No visual journey or automation builder — if you need drip flows triggered by user behaviour, you will need to script them via the API or a tool like n8n.
SQL-based segmentation is powerful but excludes non-technical operators who cannot write a JOIN.
The AGPL-3.0 license has implications if you offer Listmonk as a hosted service to other companies — check with a lawyer before re-selling.

Alternatives to Listmonk

Mautic is the heavier, marketing-automation-first OSS option — visual journey builder, deeper CRM integrations, and a much larger PHP/Symfony stack to operate. Pick Mautic when you need automation flows; pick Listmonk when you need raw send performance. Postal is a self-hosted MTA, not a campaign tool — useful as Listmonk's downstream SMTP layer if you want to run the entire pipeline yourself. Mailchimp and Brevo are the obvious managed alternatives; both will cost an order of magnitude more once you cross 10,000 subscribers but require zero infrastructure on your end.

Verdict: Is Listmonk Worth It?

If you have technical staff, send to more than a few thousand subscribers, and want to own your subscriber data, Listmonk is the obvious choice in 2026. The code is mature, the maintainer is responsive, and the cost arbitrage versus Mailchimp is brutal at scale. We rate it 89/100 — it loses points only for the steep learning curve for non-developers and for the deliverability burden it leaves with the operator. For everyone else who can write a SQL query and read a DKIM record, this is the strongest open-source ESP available.

Frequently Asked Questions

Is Listmonk free?: Yes. Listmonk is fully free and open source under the AGPL-3.0 license. There are no paid tiers, no per-subscriber fees, and no telemetry. Your only real costs are the VPS you run it on (typically $5–$20/month) and your SMTP provider's per-email charge.
What platforms does Listmonk support?: Listmonk ships official binaries for Linux, macOS, Windows, FreeBSD, NetBSD, and OpenBSD, plus an official Docker image at listmonk/listmonk:latest. The admin dashboard is a web app, so any modern browser works on the client side.
How does Listmonk compare to Mailchimp?: Listmonk is open source and self-hosted; Mailchimp is a managed SaaS. For a 50,000-subscriber list, Listmonk costs roughly $25/month all-in (server + SES) versus $350/month on Mailchimp's Standard plan. The trade-off is that Listmonk has no visual automation builder, no built-in deliverability tooling, and you are responsible for the server.
Is Listmonk open source?: Yes — the source is on GitHub at knadh/listmonk under AGPL-3.0. As of April 2026 the repository has 19,621 stars and 2,008 forks.
Does Listmonk handle email deliverability?: No. Listmonk is the campaign engine; deliverability depends on the SMTP provider you connect (Amazon SES, SendGrid, Mailgun, Postmark, etc.) and on your DNS records (SPF, DKIM, DMARC). Listmonk tracks bounces and complaints but does not warm IPs or manage sender reputation for you.
What is the latest version of Listmonk?: The latest release is v6.1.0, published on March 29, 2026. Releases are tagged on the GitHub releases page.

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