Privacy
Mirel is built so that as little of your mail as possible is ever stored, and so that what is stored stays yours. This page says exactly what happens to your data.
Your own server
When you start Mirel, it creates a private server just for you, hosted by Fly.io in Frankfurt, Germany, on an encrypted disk. Your mail is never mixed with anyone else's. Mirel HQ, which creates these servers, never receives your mail.
What your server stores
| Data | How long |
|---|---|
| Email text (body) | 14 days, then deleted from the database and search index. Older emails are read live from your mail provider when you open them. |
| Subject, sender, recipients, dates, read and star state | While your account is connected |
| AI summary, category, promises, follow-ups, drafts you haven't sent | While your account is connected |
| Mail account app passwords | Encrypted (AES-256-GCM) while the account is connected; deleted when you remove it |
| Attachments | Never stored |
| Calendar | Never leaves your device (only attendee addresses and the event title are used to find related mail) |
Server backups are kept for one day.
Who else processes your data
| Fly.io | Hosting of your private server (Frankfurt) |
| Anthropic (USA) | AI features read recent emails to sort them, summarise threads and draft replies. Anthropic's commercial API does not use this data to train models. Transfers to the USA rely on standard contractual clauses. |
| Apple | Push notifications. With “Private notifications” on, these contain no sender or subject. |
| GitHub (USA) | Bug reports you choose to send are filed as private issues for the Mirel team. |
| Your mail provider | Mirel connects to iCloud, Gmail, Zoho or your IMAP server with the app password you provide. |
Bug reports and the waitlist
If you send a bug report from the app, it goes to the Mirel team with your device model, app version and, if you choose, a screenshot. It never includes email content unless you choose to include it. Waitlist sign-ups store your email address and the role you selected, only to invite you.
Purchases
Plans are bought through Apple. We never see your card or payment details. When you buy or renew, the app hands the App Store's signed receipt to your Mirel, which checks it with Apple and keeps the plan, its renewal date and Apple's transaction number, so your iPhone, iPad and Mac all know you have a plan. Apple processes the payment under its own privacy policy.
Anonymous usage counts
Once a day your server sends the Mirel team a few numbers about the day before, so we can see whether Mirel works and what it costs to run: how often the app was opened and on which kind of device, how many mail accounts are connected and from which providers, how many emails came in and went out, which setup steps have been reached, how often each Mirel feature and screen was used, how many AI requests were made and their cost, whether an account needs to sign in again, and whether you are in your trial, on a plan or paused, and how often the plan screen was shown. These are counts only. They never include email content, subjects, addresses, names or contacts, and they are linked only to your server's technical name, never to you or your device. You can turn them off at any time in the app under Settings → Privacy & data.
Deleting your data
Remove an account in Settings → Accounts and its stored mail is deleted from your server. To delete everything, open Settings → Your data → Delete my Mirel data: your server and its disk are destroyed at once, and the last daily backup copy expires within about a day. You can also email us and we will do it for you.
Why we may process it
We process your data to provide the service you asked for (the contract with you), bug reports and waitlist sign-ups because you chose to send them (your consent, which you can withdraw at any time), and the anonymous usage counts to keep Mirel working and affordable (our legitimate interest; you can turn them off). Mirel has no ads, no tracking and no third-party analytics, and never sells data.
Your rights
Under the Swiss Federal Act on Data Protection (revFADP) and, where it applies, the EU GDPR, you can ask what we hold about you, have it corrected, exported or deleted, and object to or restrict its processing. Write to the address below. You can also complain to the Swiss Federal Data Protection and Information Commissioner (FDPIC) or your local supervisory authority.
Children
Mirel is not directed at children under 16.
Changes
If this policy changes, we update the date at the top and, for significant changes, tell you in the app.
Contact
Mirel is run by Alain Brusch in Switzerland. Contact: privacy@mirel.io.