Support

Email is the fastest way to get help. Questions, bug reports and data requests all go to the same address.

Reporting a bug

Four things make a bug report solvable rather than a guessing game. If you can include them, please do:

• What you were trying to do, and what happened instead.
• Your device and OS version — an iPhone 13 mini on iOS 18, for example.
• The Atsuma version, from Settings at the bottom of the screen.
• A screenshot, if there was anything on screen worth seeing.

Anything involving money is worth reporting immediately, even if you are not sure it is wrong. A balance that looks incorrect is treated as urgent.

Common questions

How do I delete my account?

In the app: Settings, then Delete account at the bottom. It happens straight away, and the app shows you exactly what will be removed before you confirm.

No longer have the app installed? Use the account deletion page to ask us to do it — you do not need to be signed in anywhere.

Either way, photos you added to any album are deleted, including albums other people own. Content you posted into a shared group may remain where removing it would break the record for other people — an expense that others' balances depend on, for example. The deletion page and the Privacy Policy both explain this in full.

Someone sent me an invite link. Do I need the app?

No. You can open the link in a browser and reply without an account. Once the organiser admits you, the same link shows the plan, the photos and what you owe. You need the app to join the group chat or to post photos.

How do I join with a QR code or a link?

Point your phone's camera at the QR code, or tap the link. It opens in your browser, or in Atsuma if the app is installed. An event link lets you reply to the event. An expense-group link lets you join the shared costs. A group-chat link lets you join the chat, which needs the app. To share one yourself, open the event, expense group or chat and choose Invite link, then Show QR or Copy link. For a chat, Regenerate makes the old link and QR code stop working straight away; people already in the chat stay.

How do I turn notifications off, or stop the emails?

In the app, Settings, then Notifications has a switch for messages, group messages, events, expenses, friend requests and album activity. They mute the alerts and push notifications in the app. You can also turn Atsuma's notifications off in your phone's settings.

Most of Atsuma's emails end with a Stop sending me these link: the event emails (for guests and for people with accounts) and the balance reminders. It stops all of Atsuma's email to that address except security notices (about your account) and the confirmation of an account removal request. The note about joining a group's shared expenses has no such link; write to support@atsuma.app if you want those to stop. Sign-up codes and password-reset links come from our sign-in provider and are not affected. If you stopped emails by mistake, write to us and we will turn them back on.

I forgot my password.

On the website, go to the sign-in page and choose Forgot your password?, or go straight to atsuma.app/reset. Enter your email and we send a link to choose a new password. The link works once and expires in an hour. If nothing arrives, check your spam folder, then ask again. On the phone, use Forgot password on the sign-in screen.

How much can I upload?

Each person has 5 GB of photo and video space, and videos can be up to 5 minutes long. A group chat holds up to 50 members and an event up to 50 invited people. See your usage in Settings under Personal storage. When you reach the limit, new uploads are refused but everything you have already uploaded stays, and messages and expenses keep working. Deleting photos and videos you no longer need frees space; space from deleted chat media can take up to a day to come back.

Can I use Atsuma in China?

Mostly, but some Google services Atsuma relies on can be blocked on Chinese networks without a VPN. Android push notifications, the maps, place search and the time zone lookup use Google, so they may not work, and the web app loads some of its files from Google too. Chat, events, expenses and photos do not depend on Google. Sign-up codes and reset links arrive by email, and some webmail providers deliver slowly or filter mail in China, so use an address you can reliably receive on.

Can I get a copy of my data?

Yes. In the app, open Settings and choose Request my data at the bottom; we reply within 30 days. You can also email support@atsuma.app from the address on your account and ask.

I think a balance is wrong.

Email as soon as you notice. Include the group name, the expense you think is wrong, and what you expected to see. Do not settle up on a figure you do not trust.

Is Atsuma available on Android?

An Android version is in testing. Use the Try it on Android button on the home page to ask for access, or email us.

Security issues

If you have found a security vulnerability, email support@atsuma.app with "security" in the subject line. Please give a reasonable window to fix it before disclosing publicly. Reports are taken seriously and answered.

Privacy and data requests

Access, correction, deletion and portability requests go to the same address. See the Privacy Policy for what those rights cover.