Best self-hosted Mailchimp alternatives in 2026: open-source & one-time-license, compared

It depends on what you want. For a full app you own outright, AcelleMail ships the most in one $80 one-time licence — drag-and-drop builder, visual automation, multi-user/SaaS layer, full PHP source. listmonk is the lightest free (AGPLv3) option, Mautic has the deepest open-source automation, and Keila is a newer 100% open-source (Elixir) choice. The comparison table on this page ranks them by license, cost model, and capability so you can match one to your needs.

Yes — several. listmonk (AGPLv3, Go), Mautic (GPLv3, PHP), Keila (AGPLv3, Elixir), phpList (AGPLv3, PHP), and Mailtrain (GPL, Node.js) are all free and open source; you pay only for hosting and your sending service (e.g. Amazon SES at ~$0.10 per 1,000). They trade the licence fee for either fewer bundled features or heavier operation, and their copyleft licences attach obligations if you offer a modified version as a service.

Three common reasons: cost (Mailchimp charges a recurring fee that climbs with your contact count, while a self-hosted app is a flat hosting + sending cost), ownership (your list lives in your own database, not a third-party platform), and control (your own sending domain, deliverability setup, and the ability to modify the software). The trade-off is that you run the server and handle deliverability yourself.

Mailchimp's paid plans scale with your audience size, so a 10,000-contact list can run well into three figures per month. A self-hosted app pairs a one-time licence (or a free open-source tool) with Amazon SES at ~$0.10 per 1,000 emails plus a small VPS — typically a flat ~$20–40/month regardless of list size. Over three years that is often the difference between a few thousand dollars and a few hundred. Check mailchimp.com for current tier pricing; the savings grow with your list.

Open-source tools (listmonk, Mautic, Keila, phpList) ship under OSI licences like AGPLv3/GPLv3 — free, with the full code public, but with copyleft: if you distribute a modified version or offer it as a service, you may have to share your changes. "Source-available" (like AcelleMail) means the full source ships to you under a commercial licence with NO copyleft — you can modify it privately and resell it as your own SaaS. Pick open source for $0 + community code; pick source-available when you want to own and resell without the AGPL obligations.

Yes. Export your audience from Mailchimp as CSV (Audience → Export), then import it into your chosen tool with column mapping — AcelleMail accepts CSV and XLSX with custom-field mapping, and supports very large lists via chunked import or the REST API. Tags and merge fields map across. Plan to also recreate your templates and rebuild any Mailchimp automations as workflows in the new tool.

For visual, branching journeys close to Mailchimp's Customer Journeys: Mautic has the deepest open-source automation (at the cost of heavier hosting), and AcelleMail ships Automation2 — a visual canvas with trigger / wait / condition / branch / segment-move nodes — bundled on every licence. Keila and Mailcoach offer no-code automations too. listmonk keeps automation minimal (scheduling; multi-step via its API). If automation is your priority, look at Mautic or AcelleMail.

Some. You need a server (a small VPS, cPanel host, or Docker) and a sending account (Amazon SES is the usual choice). AcelleMail installs via a 5-minute web installer and generates the SPF/DKIM records you publish; listmonk is a single binary; Mautic and Keila ship Docker images. None require you to write code, but you do manage hosting and deliverability — which is the trade for owning your stack. If that's not for you, a hosted alternative like EmailOctopus stays managed.

Yes — the AcelleMail Extended Licence ($199) and MailWizz's Extended licence add a multi-tenant SaaS layer (customer accounts, plans, billing). AcelleMail bundles 6 payment gateways, prorated upgrades, dunning, and white-label, so you run it as your own product on one install. The open-source tools (listmonk, Mautic, Keila) are single-tenant or require running multiple instances, and their AGPL copyleft applies to a modified service — so the commercial source-available route is the cleaner reseller path.

For the smallest footprint, listmonk (a single binary) is the quickest to stand up if you're comfortable with the command line. For a full Mailchimp-like UI with a guided installer, AcelleMail is straightforward and has a live demo you can try before installing anything. If you'd rather not run a server at all, a hosted SaaS such as EmailOctopus is the easiest — at the cost of a recurring fee and not owning the software.