Privacy policy
Effective October 16, 2026
The short version
- No account, no login, and we never ask for your Substack password.
- We only read information that is already public on Substack.
- No cookies, no analytics, no ads, and we never sell data.
- Scan results are kept in memory for a few hours to make repeat visits faster, then discarded.
What myStackMates does
You enter a Substack handle. myStackMates looks up that profile's recent public posts and notes, then reads the public lists of who liked, commented on and restacked them. It arranges those people in circles and suggests one of their articles plus their latest post.
Information we handle
- The handle you enter. It's sent to our server so we can run the scan. Your browser also remembers the last handle you used (in local storage on your device) so you don't have to retype it. You can clear it by clearing this site's data in your browser.
- Public Substack data. This includes names, profile photos, handles, publication names, public posts, and public likes, comments and restacks, as published on Substack. We don't access anything private, paywalled or behind a login.
- Scan results. Results are kept in our server's memory for up to 6 hours so a repeat request is instant and doesn't hit Substack again. Public profile and post-list lookups for stackmates are kept for up to 12 hours. Nothing is written to a database; it all disappears when that time passes or the server restarts.
- Fair-use limits. To keep the service fair when it's busy, our server remembers your IP address and when you started a scan for up to one hour, in memory only, so it can limit how many new scans one person runs.
- Technical logs. Like most websites, our hosting provider may keep standard server logs (such as IP address, time and the page requested) for security and reliability. We don't use them to profile anyone.
What we don't do
- We don't use cookies, analytics, advertising or tracking pixels.
- We don't sell, rent or share data for marketing.
- We don't post, like, comment, message or change anything on Substack.
Third parties your browser talks to
- Substack. Our server requests public data from Substack. Profile photos and cover images load directly from Substack's image servers, so Substack may see your IP address when they load.
- Google Fonts. Fonts load from Google, which may see your IP address. See Google's privacy policy for details.
People who appear in your circles
The people shown chose to like, comment on or restack publicly on Substack. myStackMates only displays what Substack already shows publicly. If you appear in someone's circle and would like us to exclude your profile, email us and we'll add you to an exclusion list.
Children
myStackMates is not directed at children under 13 (or the minimum age in your country) and does not knowingly process their information.
Your choices and rights
Because we don't keep accounts or long-term records, there's usually nothing stored about you to access or delete. Depending on where you live, you may still have rights to ask what we hold, request deletion or object to processing. To make a request, contact us using the address below.
Changes
If this policy changes, we'll update this page and the effective date above.
Contact
Questions or requests: hello@mystackmates.com