Privacy Policy

Effective October 19, 2026

Redline Reader (“Redline”, “we”) is a speed-reading app. This page explains, in plain language, what we store, why, and how you can delete it.

Short version: we keep what’s needed to run the reader and sync it across your devices. We don’t sell your data, show ads, or use tracking analytics. You can delete your account and everything in it at any time.

If you don’t sign in

You can use Redline without an account. Your library, reading progress and stats are then stored only in your browser on that device. Clearing the site’s data in your browser deletes them.

What we store when you have an account

Accounts and synced data are stored with our database and authentication provider, Supabase.

Account details: your email address, and your name if you sign in with Google or enter one.
Your library: the text of documents you add (as extracted words), titles, authors, chapter lists, and cover images.
Reading activity: reading progress, reading sessions (when you read, for how long, how many words), your speed setting, daily goal and streak.
Settings: reminder preferences, time zone, and, if you turn on notifications, your browser’s push-notification address.

How we use it

Only to provide the reading service: showing your books, keeping your place, calculating your stats and streak, syncing everything across your devices, and sending the reminders you’ve turned on. We don’t sell or rent your personal data, and we don’t use it for advertising.

Leaderboard and friends feed (optional)

Redline turns your reading into XP and a reader level on our servers. Both are calculated from your reading sessions, and only you see them unless you switch one of the options below on in Stats.

Show me on the leaderboard (off by default) puts you in a weekly league with other readers who have it on. They can see your display name, reader level, XP, streak and reading totals: time, words, speed and books finished.

Share milestones with friends (off by default) posts short updates to the feed of other readers who share theirs: hitting your daily goal (with that day’s minutes and words), level-ups, streak milestones, perfect weeks and league promotions. Each update shows roughly when it happened, for example “3h ago”. Friends can give kudos, and you see who did.

Nobody else ever sees your email, your books or files, or your individual reading sessions. Turn either option off at any time. You leave the board straight away; you leave your league at the next weekly reset, and while you’re off, your name is hidden from it. Turning sharing off also hides the updates you already posted. While sharing is on, friends see updates from the last 14 days.

Documents you upload

Files you add (PDF, EPUB, Word, text and others) are processed to extract their text so it can be shown in the reader. Most of this happens on your own device; we keep the extracted text and a cover image, not your original file.
Audio and video files are uploaded to temporary storage, sent to our transcription provider (Deepgram) to turn speech into text, and deleted after transcription.
Some features use an AI provider (Anthropic): finding chapter breaks (we send chapter titles and short previews, not the whole book), picking your daily “morning line” (we send a short excerpt from the part of the book you’ve already read), “Find a free book” (we send the title, author and notes you type), and the cover prompt helper (we send the book’s title, author, a short excerpt and your cover idea).
If you create a cover with AI, your cover prompt is sent to our image provider (OpenAI) to generate the image, which is then stored as your book’s cover.

Who else processes data

Supabase — accounts, database and file storage.
Vercel — hosts the app and its servers. To enforce daily usage limits we keep counters keyed to a one-way hash of your IP address, not the address itself.
Deepgram — audio/video transcription, only when you upload audio or video.
Anthropic — the AI features described above.
OpenAI — only when you generate an AI cover.
Google — only if you choose “Continue with Google” to sign in.
Your browser’s push service (for example Google, Mozilla or Apple) — only if you turn on notifications, to deliver them.

These providers process data on our behalf to run the service.

Deleting your data

Delete your account: open Redline → the account button at the top of the library → Delete account. This permanently deletes your account, your synced library, uploaded text and covers, reading stats and settings.
Removing a book from your library deletes it from your account too.
Signing out removes your synced library from that device.

Children

Redline isn’t directed to children under 13, and we don’t knowingly collect their personal information.

Changes

If we change this policy, we’ll update this page and its effective date. Significant changes will be shown in the app.