Pricing
One line, and it doesn't move.
A human driving mimux is free, forever. A machine driving mimux — the API, the MCP server, webhooks — is paid. Nothing ever crosses from the free side to the paid side.
The client
€0
forever · AGPL-3.0
- The complete mail client
- Unlimited accounts & devices
- Sync, search, compose, filters
- PWA, encrypted push, ntfy
- AI compose & translate (your key)
- Community support on GitHub
Pro — annual
€49/year
per instance · ELv2 · cancel anytime
- Everything in the client
- REST API with OpenAPI spec
- MCP server for AI agents
- CLI for shells and scripts
- Signed webhooks with delivery log
- Scoped API tokens
- All updates while active
Pro — perpetual
€99 once
per instance · ELv2 · yours forever
- Everything in Pro annual
- One payment, no subscription
- Covers all builds released within a year of purchase
- Those builds run forever
14-day free trial of pro, no key, no card · 14-day money-back guarantee · payments by Stripe at account.mimux.dev
The licence, honestly
Built to be trusted, not to trap you.
Verification
Offline Ed25519 signature check, built into the binary. No activation server, no fingerprint, no phone-home. Check it: mimux licence status.
Expiry
Annual lapsed? 14 days of grace with warnings, then only the automation layer stops. Your mail client never does — that's a design guarantee, not a promise.
Source
The pro code is in the public repo under ELv2 — read every line before paying. make verify-free proves the free build links none of it.
Scope
Per instance, flat. Unlimited mail accounts, unlimited agents, unlimited requests. Two servers, two licences — that's the whole model.
The alternative
Hosted email APIs exist. So does the catch.
Email API services are excellent products — for companies connecting thousands of customer mailboxes. For one person's inbox, the trade looks different:
| mimux pro | Hosted email API | |
|---|---|---|
| Where your mail lives | Your server, full stop | Synced into a vendor's cloud |
| Pricing model | Flat, per instance | Per mailbox, per month |
| Works offline / on a LAN | Yes | No |
| A mail client included | Yes — it's the core | No |
| If the vendor disappears | Everything keeps running | The API goes with them |
FAQ
Fair questions, straight answers.
What is free, and for how long?
The complete mail client — sync, search, compose, filters, notifications, PWA, AI compose with your own key — is free under the AGPL-3.0, forever. Nothing is metered, and nothing will move behind a licence key later. Only the automation layer (REST API, MCP server, webhooks) is paid.
What happens when an annual licence expires?
You get a 14-day grace period with warnings. After that, only the automation layer stops — API, MCP and webhooks. The mail client itself keeps working forever, licensed or not. Your mail is never held hostage.
What does the perpetual licence cover?
One payment covers every mimux build released within one year of your purchase, and those builds run forever — automation layer included. Builds released after that need a new licence, but nothing ever forces you to upgrade.
How is the licence enforced? Does mimux phone home?
No. Licence keys are verified offline with an Ed25519 signature check built into the binary. There is no activation server, no machine fingerprint, and no phone-home — the app makes zero network calls to us, ever.
Can I try pro without a card?
Yes. A pro build runs the full automation layer for 14 days from first boot, no key and no card. When the trial ends the client keeps working — only the automation layer pauses until you add a key.
What does "per instance" mean?
One licence covers one running mimux server, no matter how many email accounts it connects to or how many agents talk to it. Run two servers, buy two licences.
Is there a refund policy?
14-day money-back guarantee on a first purchase, no questions asked — email mattmezza@gmail.com from the address you purchased with. EU and EEA consumers keep any statutory withdrawal rights that apply. Details in the terms.
Is the pro source code available?
Yes — the pro layer lives in the same public repository under the Elastic License 2.0, so you can read every line before buying. ELv2 allows almost everything except reselling mimux as a hosted service, circumventing licence keys, or removing notices.
Why is the automation layer paid at all?
Because email integration is never finished. Providers change auth, protocols drift, and someone has to keep the integration working for years. The licence funds that maintenance. The split is principled: a human driving mimux is free; a machine driving it is paid — and the line is published, so it can't quietly move.
Is there a GraphQL API?
Not yet — it's on the roadmap. When it ships it will be part of pro like every other machine interface, at the same price. Nothing about the licence changes.
Try the whole thing first.
Install mimux free, flip on the pro trial, and decide in two weeks with your own mail on your own hardware.