Last updated: 21 August 2026
The short version: Synopsical stores what you type into your own compendium — that's the whole product. Signing in needs an email and password. Entries are private to your account. Generating "related entries" suggestions sends an entry's text to one outside AI provider. Subscribing to the newsletter shares only your email with the service that sends it. There's no advertising, no analytics, and nothing is sold to anyone.
Everything below is the specific, complete version of that.
To create an account: an email address and a password. The password is never stored in readable form — Supabase, the database service Synopsical runs on, handles that using standard secure hashing, and we never see or store the plain password ourselves.
What you write: entry titles, categories, tags, summaries, body text, custom fields, links between entries, and anything you upload — faceplate images and custom font files. This is the actual content of your compendium, and it's private to your account by default; nothing you write is shown to other users or made public by the app.
If you subscribe to the newsletter: just an email address. Subscribing doesn't require an account, and isn't linked to one if you already have one.
Supabase hosts the database, file storage, and sign-in system Synopsical runs on. Your account and entries live there. This is the one service everything ultimately runs through.
OpenRouter is used for exactly one feature: suggesting related entries by meaning, not just shared tags. When that runs, an entry's title, tags, summary, and body text are sent to OpenRouter's API to generate what's called an "embedding" — a mathematical representation of the text's meaning, used only to compare entries against each other. The text itself isn't stored by OpenRouter beyond processing the request, based on their own provider terms.
Resend is used only for sending emails — the newsletter (if you subscribe) and account emails like sign-up confirmation and password resets. It sees the relevant email address and nothing else.
Google Fonts supplies the typefaces used across the site. Loading a font makes a direct request to Google's servers, which — like any request to any server — includes technical details such as your IP address. No account or content data is sent as part of this.
Nobody's information is sold, rented, or shared with anyone beyond the services above, and those are used only to run the features described here.
Synopsical doesn't use cookies, and doesn't run any analytics or advertising trackers. Staying signed in works through your browser's own local storage, on your device only — it's how the app remembers you between visits, and it isn't something we can read or access remotely.
Two controls exist for exactly this, both directly in the app, both immediate — neither is a support ticket:
If you'd rather have this done for you, or have any other question about your data, reach out at admin@synopsical.com.
Synopsical isn't directed at children, and we don't knowingly collect information from anyone under 13.
If this page changes in any meaningful way, the date at the top will be updated. Continuing to use Synopsical after a change means you've accepted the update.
Questions about any of this: admin@synopsical.com.