Privacy

Updated September 10, 2026. CoHours is run by its solo developer. Questions: hello@cohours.com.

What is stored

No account or sign-in is required. A random browser ID in local storage connects this browser to its records. A browser ID is not a verified person: different browsers may belong to the same person.

Cloudflare stores the browser ID, study sessions and minutes, materials and goals you enter, reservations, room presence, invitations, Circle membership and messages, safety reports, and optional notification subscriptions. Basic usage events include visits, starts, completions and invitation actions, with the referral code from the link. While a personal timer runs, periodic server check-ins record connected working intervals to understand initial use and return visits.

Feedback is stored with the browser ID and, if supplied, an email address used only to reply. Feedback may be forwarded to the developer's inbox through the configured email provider. The database remains the record if email delivery fails.

The landing page also records page views, scroll depth, time on page and button clicks, referral codes and a country code inferred at the network edge. The app does not store your IP address as a user record; hosting providers process network requests.

What other people see

People in your room or Circle can see your chosen name, current study status and elapsed time, room goals, and messages you send. An invitation can show your name and completed time. Your full private study history and reply email are not public.

Your device and service providers

Preferences, drafts and some study data also remain in this browser. Calendar files and share images are generated on your device. Cloudflare hosts the app and its database; Vercel hosts the landing page. Their infrastructure processes requests to deliver and protect the service. CoHours does not add advertising trackers, sell your data, or request camera or microphone access.

Questions and deletion requests

Use the app → Me → Feedback from the browser you use for CoHours, and say which data you want removed. The request includes this browser ID so its records can be located. You can also contact hello@cohours.com; we may need to confirm the browser ID. Requests are handled by the developer. Clearing browser storage does not delete server records, and may make it harder to connect your request to them. There is no automatic expiry currently promised for study records.

日本語

ログインは不要です。ランダムなブラウザIDに学習時間、教材や目標、予約、在室、招待、Circleの活動、通知設定、基本的な利用イベントを結び付けてCloudflareに保存します。タイマー動作中の定期接続から、接続を確認できた学習時間も記録します。ブラウザIDの数は、確認済みの実人数とは限りません。

同じルームやCircleには名前、現在の学習状態と経過時間、送った目標やメッセージが見えます。履歴全体と返信先メールは公開されません。フィードバックと任意の返信先は保存し、返信先は返信だけに使います。削除依頼は利用中の端末からMe → フィードバックへ送ってください。ブラウザの保存内容を消してもサーバーの記録は消えません。開発者が個別に対応します。