Draft for review · not legal advice
Privacy policy
Last updated 16 October 2026
Mintern helps founders plan and post to social media. This page explains what we keep about you, why, who helps us run the service, and what you can ask us to do with it. If anything here is unclear, email hello@mintern.app.
Who we are
Mintern (mintern.app) is run by its founder in the United Kingdom. For UK GDPR, we are the controller of the personal data described here. Contact: hello@mintern.app.
What we store
- Your account. Your email address, and your name and profile picture if you sign in with Google. We use these to sign you in and to contact you about your account.
- Connected social accounts. When you connect Bluesky, Threads, Instagram or Facebook, we keep the account's handle and ID and the password or access token it needs. Passwords and tokens are encrypted before they are stored and are never sent to your browser.
- Your posts. The drafts the strategist writes, any picture cards, your edits, what you approve or reject, when posts are scheduled, and whether they went out.
- Post results. Likes, replies, reposts and similar counts we fetch from the platforms, so we can show what worked.
- Your settings. Notes on how you write and what you sell, words you never want used, and your time zone.
- Chat with the strategist. Your recent chat is kept in your own browser, not on our servers. Each message you send, with the chat so far and your settings, is passed to Anthropic's Claude to write a reply. Drafts it suggests are saved as posts.
- Technical logs. Our hosting keeps short-lived request logs (such as IP address, time and the page asked for) to keep the service running and safe.
We don't sell your data, show you ads, or use your data to train AI models.
Why we use it (our lawful basis)
- To provide Mintern to you (performance of a contract): signing you in, writing and posting drafts, showing results.
- To keep it secure and working (legitimate interests): logs, fixing faults, preventing abuse.
- To meet legal duties (legal obligation), for example keeping records if the law requires it.
Who processes it for us
We use a small number of trusted services. Each only gets what it needs to do its job.
- Supabase stores your account and data and handles sign-in (database hosted in Tokyo, Japan).
- Cloudflare hosts the website and runs the service that posts on your behalf.
- Resend sends sign-in codes and account emails.
- Anthropic runs Claude, the AI model behind the strategist. It receives your chat messages, your settings and recent posts to write replies and drafts.
- Google, if you choose "Continue with Google", confirms who you are.
- Bluesky and Meta (Threads, Instagram, Facebook), only when you connect an account. They receive the posts you approve and send us the counts for them. Their own privacy policies apply to what you post there.
Data outside the UK
Some of these services store or process data outside the UK, including in Japan and the United States. Where they do, we rely on the safeguards the law allows, such as UK adequacy regulations or the UK International Data Transfer Addendum to the EU standard contractual clauses.
How long we keep it
We keep your data while your account is open. When you delete your account, we delete your account, connected accounts, posts and results within 30 days, apart from anything we must keep by law. Backups held by our providers roll off on their own schedule. Disconnecting a social account deletes its stored password or token straight away.
Your rights
Under UK GDPR you can ask us to:
- give you a copy of the personal data we hold about you;
- correct anything that's wrong;
- delete your data;
- limit or object to how we use it;
- send your data to you or another service in a common format.
Email hello@mintern.app from the address you sign in with and we'll reply within one month. It's free.
Deleting your account
You can disconnect any social account from Set-up in the dashboard at any time. To delete your whole Mintern account, email hello@mintern.app from the address you sign in with and we'll delete it and confirm by email. Clearing your browser's site data removes the chat history kept there.
Cookies and browser storage
We don't use advertising or tracking cookies. Your browser stores your sign-in session and recent chat so the dashboard works. The sign-in page loads fonts from Google Fonts, which sees your IP address.
Complaints
If you're unhappy with how we've handled your data, please tell us first. You can also complain to the Information Commissioner's Office at ico.org.uk.
Changes
If we change this policy in a way that matters, we'll update the date above and email you before it takes effect.