Privacy notice

Math Culture is run by Arts Culture Pte. Ltd., Singapore. Last updated 25 October 2026.

In short: a parent owns the account and decides what their children use. We collect as little about children as we can: a nickname, their level and their learning progress. We never show ads, never sell data, and the AI service we use does not train its models on what children type.

What we collect

About the parent	Email address or mobile number (to sign in and send login codes); your name if you give it; your name and signature when you accept the subscription terms; your plan and payment status. Card payments are handled by HitPay; we only keep the card brand and last 4 digits, never the full number.
About each child	A first name or nickname, Primary level, chosen buddy, an optional 4-digit PIN (stored scrambled, never in plain form), and learning progress: questions answered, mastery scores, papers, practice days and minutes, and settings such as voice and music.
Buddy chats	When a child asks their buddy for help, we keep the question, the child's message and the buddy's reply so you can read them in the Parent area. These are deleted after 90 days.
Devices and security	Device name, browser type, IP address and sign-in times, to keep accounts secure and enforce the device limit.

We do not ask for a child's full name, school, photo, voice recording, location, email address or phone number.

How we use it

To run Math Culture: save progress, sync it across your devices and pick the right practice for your child.
To send you login codes, receipts and, unless you switch it off, a weekly progress report.
To keep the service safe, prevent misuse and fix problems.
To improve our questions and teaching, using combined statistics that do not identify anyone.

We do not use children's data for advertising or marketing profiles, and we do not sell personal data.

Companies that help us

Railway	Hosts the app and database, in Singapore.
Anthropic (Claude)	Powers the AI buddy and fresh word problems. We send the maths question, the worked steps, the child's message and nickname. Anthropic's commercial terms say it does not train its models on content from customers of its paid services. Processing may take place outside Singapore.
Microsoft Azure	Turns question text into the Singapore-English reading voice. Only the question text is sent.
HitPay	Processes subscription payments.
Resend	Sends emails such as login codes and weekly reports.

How long we keep it

Buddy chats: 90 days.
Login codes: 30 days. Security and sign-in logs: 13 months.
A removed child profile and its progress: deleted for good 30 days after removal.
Your account and children's progress: for as long as you have an account. Ask us and we will delete it.

Your choices and rights

See and change your children's profiles, time limits and bedtime, read buddy chats, and switch weekly reports on or off in the Parent area.
Remove a child's profile and progress at any time in the Parent area.
Ask for a copy of your data, a correction, or deletion of your whole account by emailing us. We reply within 30 days.
You can withdraw consent at any time; we will then delete the data we no longer need to keep.

Children

Math Culture is made for primary school children to use under a parent's account. The parent creates each child's profile and gives consent on the child's behalf. Children cannot message other users, and there is nothing public in the app.

Security

All traffic is encrypted (HTTPS). PINs and login codes are stored scrambled (hashed). Only the account owner can see their family's data, and staff access is limited to running and supporting the service.

Contact and Data Protection Officer

Questions, requests or complaints: email our Data Protection Officer at thetradingdad77@gmail.com. You may also contact the Personal Data Protection Commission (PDPC) of Singapore.

We will update this notice if how we handle data changes, and tell you about important changes by email.