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Private expense sharing app: 13 questions to ask before you choose

October 7, 2026 · 9 min read · Dimesum Engineering

Privacy is a fair way to choose a splitting app: what it keeps, what it reads beyond the bills, and whether leaving is a button. Thirteen questions to ask any app, answered for Dimesum from its privacy notice.

A private expense sharing app tells you in plain words what it keeps, who else reads it, and how you leave. Dimesum shows no ads and sells no data. It masks phone numbers, email addresses and payment handles before a model reads a bill you type, and it lets you delete your account from inside the app, with seven days to change your mind.

The questions below are the ones to ask any app before your group puts a year of bills into it. The answers are Dimesum's, taken from our privacy notice as updated on 7 October 2026. Facts about other apps come from our own market research and are dated to August 2026.

What makes an expense sharing app private?

A private expense sharing app keeps only what the split needs, says who else touches it, and lets you delete it without writing to anyone. Three things decide it: whether it sells or advertises with your data, how much access it asks for beyond the bills, and whether leaving is a button or a request.

The bills themselves are shared by design. Everyone at a table sees that table's records, because a balance only works when both sides can check it. Privacy here is about everything around the bills: your contact details, your payment details, your other accounts, and who else gets a copy. The bill splitting apps comparison counts getting your data out among its four tests.

Does Dimesum sell data or show ads?

No. Dimesum shows no advertising and sells no data, and no data goes to advertisers or data brokers. The privacy notice says so in its first paragraph, and the list of companies that process data for Dimesum contains no ad network.

That list is short and public, and the table further down shows what Dimesum keeps. If an app cannot show you the equivalent, ask why before your group signs up.

Does an AI model read my bills?

Only a bill you type as a sentence, and only after masking. When you write "coffee 12 with Lucas", a language model turns it into a draft you confirm. Before the sentence leaves Dimesum's server, phone numbers, email addresses and payment handles are replaced with placeholders, and government identifiers are removed outright.

The names of the people at your table are sent, because matching them is the point. The model provider is Groq, under terms that forbid training on the text and bound how long it is kept. Nothing a model returns posts on its own, and Dimesum does not train models on your bills; why we deleted our expense parser tells how that design came about.

Does a splitting app need my bank login or my shopping accounts?

Dimesum needs neither. It signs you in with an email address and a code, or with Google if you choose, and any payment details you add are handles you choose to show your group. Apps that fetch bills from your other accounts ask for much more, and that is where reviewers start to worry.

A review on Splitkaro's Play Store listing, read on 22 August 2026, put it plainly. As of August 2026, Splitkaro fetches bills from food delivery and grocery apps, and the reviewer wrote that it "is effectively logging into" those accounts "to fetch my bills", then asked whether it could see saved cards and addresses. Splitkaro's payments FAQ says its payments are powered by Yes Bank and Decentro.

Does the app hold or move my money?

Dimesum never holds or moves money. It records that a payment happened, and your bank or payment app moves it. The payment doors it shows, such as PayPal, Wise or a bank transfer by IBAN, open the app you already use.

Some splitting apps have moved into payments. As of August 2026, Splitwise Pay is a US wallet banked by Coastal Community Bank, and the Splitwise Card is a Mastercard debit card from the same bank that splits each purchase at the till. Splitwise also offers pay by bank through Tink in the UK since April 2024, and in France, Germany and Austria since October 2025, as Tink's announcement records. When an app moves money, a bank and a payment network sit in the path of every payment.

The rest of the comparison is in Dimesum vs Splitwise, and the Splitwise alternatives list covers the other apps a group might move to.

What does Dimesum keep about me?

Your email address, your display name, and anything you choose to add: a photo, a phone number, payment details. It also keeps the bills, splits, comments and settlements your group records, plus the technical records that keep you signed in and the service running.

Who else sees my data, and where is it stored?

Eight named service providers, and the privacy notice lists what each one sees. Oracle Cloud runs the servers and database in its Mumbai region, Resend sends the sign-in code, Groq reads a masked typed bill, Cloudflare serves the website and stores encrypted backups, Sentry and Grafana Cloud see error and timing data, Google sees a sign-in only if you choose it, and Expo carries phone notifications.

Backups are encrypted on Dimesum's server before they are stored and are kept for at most 35 days. The privacy notice names each provider and its job.

Who in my group can see what I record?

Everyone at a table sees that table's bills, splits and settlements. Your payment details show only to the people at your tables when they settle with you. A phone number, if you add one, is never shown to strangers. For a couple the table is just the two of you, which is the setup the apps for couples to split expenses are ranked on.

Edits are visible too. When a bill is corrected, the history keeps both versions, so the table can see what changed; why an edit must restate its split explains the reason. Someone who joins a quick split from a link sees that one table, as splitting a bill with someone who does not have the app describes.

Does Dimesum read my phone contacts?

No. If you tap "Find people from your contacts" on a phone, your phone turns each number into a hash and sends only the hashes. Dimesum answers with the accounts that match and keeps nothing from the request; the matches stay cached on your phone until you refresh.

Can I delete my account from inside the app?

Yes. Go to Me, then your profile, then Delete account. A fresh sign-in code confirms it is you, and you have seven days to change your mind before the deletion goes through.

If you have already uninstalled the app, you can ask by email from the delete your account page. Leaving an app should be a button, and before you commit a group's history anywhere, find that button first; moving a group off Splitwise shows what leaving looks like when the exit is harder.

What happens to shared bills after I delete my account?

Your personal details go, and the amounts stay. Dimesum deletes your email, name, photo, phone, payment details, sessions and devices, and your seat at every table becomes "Former member". The bills you shared keep their amounts, because your flatmates' balances are their records too.

That is the arithmetic of the table without the person. Encrypted backups age out within 35 days. The append-only ledger post explains why a shared record cannot lose one side of a bill.

Does the Dimesum website use tracking cookies?

No. The website sets one cookie, dimesum_in, and only while you are signed in to the web app. It holds your initials so the site can show that you are signed in, grants no access to your account, and is removed when you sign out.

Is a bank's split feature more private than a separate app?

It changes where the record lives. Revolut Group Bills, Monzo Split and Venmo Groups sit inside a bank or a payment app, and Tricount has been owned by the bank bunq since 2022. The record of who owes whom then sits with the company that already holds your account and your payment history.

If you would rather keep the score apart from your bank, a separate ledger does that. Our comparison of bank split features and the Tricount alternatives post cover the features themselves, and the ranking of shared-expense trackers adds privacy to the other tests.

What rights do I have over my data?

You can see everything Dimesum holds in the app, correct it under Me, remove a phone number or payment detail at any time, and delete the account. Write to support@dimesum.com for a copy in a file or to complain; a person reads that mailbox.

In the European Union and the United Kingdom you also hold the rights the GDPR and UK GDPR give: access, rectification, erasure, restriction, portability and objection. You must be 18 or older to open a Dimesum account.