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Privacy policy

Last updated 29 September 2026

Productivity Tracker (kristoffergt.com) is a small study and productivity app run by Kristoffer Tiedemann as a private individual. This page says what the app stores about you, who can see it, who helps run it, and how to get it deleted.

What is stored

There are no ads, no analytics and no tracking cookies. Videos embedded in notes use YouTube's privacy-enhanced (no-cookie) player.

Who can see it

Nothing is sold, and nothing is shared for marketing.

Services that help run the app

ServiceWhat it does
SupabaseDatabase, sign-in, file storage and server functions. Data is stored in Supabase's Seoul, Korea region and encrypted at rest.
ResendSends the app's emails (welcome, reminders, recaps, notices). Receives your email address and the email's content.
Apple, Google, Mozilla and Microsoft push servicesDeliver phone and browser notifications, if you turn them on.
GoogleConfirms who you are, only if you choose to sign in with Google. Google learns that you use this app, and sends your name, email address and profile picture link. Its sign-in button is loaded from Google on the sign-in screen, so Google sees your IP address there even if you do not use it.
Have I Been PwnedChecks a new password against passwords leaked in known data breaches. Only the first 5 characters of the password's SHA-1 hash are sent, never the password itself, and the comparison happens in your browser.
GitHub PagesHosts the website itself.
jsDelivr, cdnjs, Google FontsDeliver the scripts and fonts the page loads. Like any website your browser contacts, they see your IP address.

How long it is kept

Until you delete it, or until you delete your account. Deleting your account (Account settings → Delete account) first keeps it for 30 days, in case it was a mistake or was not you: during that time it is hidden from everyone else, you get no emails from it except one saying when it will be deleted, and signing in restores it exactly as it was. After the 30 days your account and everything you added are deleted for good, and the files you uploaded are removed within a day.

Your choices and rights

Age

You must be 13 or older to create an account, or 14 or older if you live in Korea.

Security

All traffic is encrypted (HTTPS), stored data is encrypted at rest, uploaded CVs and cover letters are private and opened through short-lived links, and you can protect your account with two-factor authentication.

Changes

If this policy changes, the date at the top changes with it.

Contact

Kristoffer Tiedemann · kristoffergt@gmail.com

See also the terms of use.