Extra Credit Privacy Policy

Publisher: Choordinator LLC · Effective date: October 23, 2026

Who we are

Extra Credit: Math Games is a game for Android and iPhone/iPad published by Choordinator LLC. It holds two games, Pushback and Sumhaven, with math practice for children. Homeroom is our website where parents and teachers see how a child is doing and choose what the child practises. This policy covers the game and Homeroom.

What the game sends, and when

From the first launch, without any account:

• A random id. Our server gives each install a random id and a secret key. They are used only to give the right save and settings back to the right game. They are not the phone's advertising id or hardware id.
• A few facts about the install: which game, Android or iPhone, the app version and the phone model (for example "Pixel 8"). We use them for support.
• The save. After each play session the game sends a copy of its save file. The save holds game progress, the math settings, the game's own record of which math facts were answered right or wrong, and total play time. In Sumhaven it also holds the names a child gives to creatures. Beside each save we keep short labels (such as "Long Winter chapter 3" or "4 creatures"), the minutes played, the first and last day played, and we do not record where in the world the save came from. We never use GPS or ask for location permission.

Only after a grown-up agrees in Homeroom (see below):

• Each math answer: the problem (for example 7 + 8), the answer given, whether it was right, how many seconds it took, the grade and number range in use, and the time on the device with its time zone offset, so "today" on the dashboard is the child's own day.
• Once, the game's record of right and wrong facts from before, so the dashboard starts with what the child already practised.

Before anyone has agreed, our server stores no math answers. The game keeps them on the device instead.

Only if a grown-up uses these screens (they sit behind a grown-up lock, a multiplication question):

• Join a class: the class code and the name the child picks from the teacher's list or types. That teacher is the only person who sees it.
• Bring my creatures: a save code typed to move a save to this device.

The game has no ads, no advertising id, no analytics, no crash reporting, no chat, no purchases and no links out of the app. It contains no third-party software kits. It never sends the phone's hardware id: it keeps a scrambled form of it on the phone only, to notice when its files were copied to a new phone.

Your phone's own backup (Android backup or iCloud) may also copy the game's files to your Google or Apple account. That backup is run by Google or Apple under your account, and we cannot see it.

What Homeroom collects from grown-ups

• Sign-in: your email address, and your name and picture if you sign in with Google or Apple. Apple lets you hide your email; we then get an address Apple forwards.
• What you enter: a nickname, grade and picture for each child you add, the math settings you choose, and whether you want the weekly email.
• Teachers: the class name, the school's name, the names on your roster, and, if you add one, a school email address we check with a link.
• Payment: if you buy the family plan, Stripe takes the payment. We keep only that the plan was paid and Stripe's reference numbers. We never see your card number.

Consent, parents and teachers

Parents. A parent signs in to Homeroom, types the save code shown on the game's Grown-up page, and ticks a box agreeing that Homeroom keeps a backup of the child's saves and a record of the math problems they answer. That is the parent's consent. A second parent can join with the same code.

Teachers. A teacher makes a class and ticks a box saying they act for their school in allowing Homeroom to keep a record of the math problems the children on their roster answer. Children join from the game and appear to the teacher only by the name on the roster. The teacher approves each one. A teacher sees a child's progress only while the child is in one of their active classes, and never sees a parent's name or the family's data export.

A child's record keeps answers only while a parent's or a school's consent is in place. When a child leaves their last class and no parent has agreed, the game stops sending answers.

How we use it

Only to run the games and Homeroom: to back up and restore saves, to show parents and teachers progress and let them change practice settings, to send sign-in links and the weekly progress email, and to help a family who writes to us find a lost save. We do not use it for advertising, we do not build profiles for anyone else, and we do not sell or share it.

Who handles it for us

These companies run parts of the service for us and may use the information only to do so:

• Vercel hosts the Homeroom website and server.
• Neon runs our database, in the United States (US East).
• Resend sends our emails to grown-ups.
• Stripe takes payment for the family plan.
• Google and Apple handle sign-in if you choose them.

Everything travels over encrypted connections (HTTPS). We would disclose information only if the law requires it.

How long we keep it

• Saves: the five newest copies of each game's save for a child, plus the current one. Older copies are deleted automatically.
• Math answers: each answer is deleted 180 days after it arrives. The daily and per-fact totals made from them stay until the child's record is deleted.
• Answers of a child nobody has consented for: deleted 30 days after the last parent's or school's consent ends, or 30 days after they arrive if there never was a consent.
• Internet addresses used to stop people guessing codes: deleted within two hours. Our host keeps short-lived server logs for running the service.
• A child's record (saves, answers, settings and devices) stays until a parent who added the child deletes it, or until we delete it at your request. A child with no grown-up, no class and no activity from any of their devices for two years is deleted automatically.
• Grown-up accounts stay until you delete yours on your Account page in Homeroom, or ask us to.
• Support records: when we help someone, we keep a record of what we looked up or changed, which may include a child's save code. These records are kept so we can account for every support action.

Deleted data is removed from our database at once. Copies may remain in our database provider's recovery backups for a short time until they expire.

Children's privacy

The game is made for children. It does not ask a child for personal information. Before a grown-up is involved, it sends only the save and a random id, used for nothing but giving that save back. Before a grown-up links a child, the game sends only a random device id and the game's own save so the save can be restored on a new phone; this is used for nothing else, which is the kind of internal operation children's privacy law allows without consent. Math answers are stored only with a parent's consent given in Homeroom, or a teacher's consent given for their school. We do not show a child's information to other players, and children cannot talk to anyone through the game. We designed the game and Homeroom to meet the U.S. Children's Online Privacy Protection Act (COPPA) and Google Play's Families policy.

A parent can review, download or delete what we hold about their child at any time, and can write to us to stop us collecting more.

Your choices

• See and download: on the child's page in Homeroom, Export data downloads everything we hold about the child as a file.
• Delete a child: on the child's page, Delete this child removes every save, every answer and every device for that child at once. A teacher's roster keeps the name the teacher typed until the teacher removes it.
• Leave a class: a parent can take the child out of a class on the child's page; the teacher can also remove them.
• Stop the weekly email: use the link in any weekly email, or turn it off on your account page.
• Delete your account: on your Account page in Homeroom, Delete my account removes your account and your link to every child. The children's games keep working and their saves stay; another grown-up who is linked keeps seeing them. You can also write to us from your sign-in email.
• Delete a child no grown-up has added: write to us with the child's save code, and we will delete it.
• In the game: uninstalling the app removes everything on the device. It does not delete the backup on our server; use Homeroom or write to us for that.

Changes to this policy

If this policy changes, the new version will be posted on this page with a new effective date. If we ever want to collect something new from children, we will update this page before that version of the game is released, and ask parents again where the law requires it.

Contact

Questions, requests or concerns about this policy, the game or Homeroom: support@choordinator.com
Choordinator LLC