Cosum: Split Bills & Expenses
Roommates, trips & couples
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Cosum keeps track of what your group spends — and tells you exactly who owes what, in the fewest possible transfers.
Add an expense, split it equally or by exact amounts or shares, and Cosum does the math. No spreadsheets, no chasing people down, no "wait, who paid for what again."
WORKS WHERE YOU ARE
• Add expenses from your phone or straight from your browser — cosum.app works from any laptop, same account, synced instantly
• See a shared ledger's basics before you even sign up — check it out, then join when you're ready
• View your balances even offline
PERFECT FOR
• Roommates splitting rent, bills and groceries every month
• Trips and holidays with friends or family
• Couples sharing everyday costs
• Any group that owes each other money and wants it simple
BUILT FOR REAL LIFE
• Split equally, by exact amount, or by shares — for every kind of expense
• Recurring entries for rent, subscriptions and salary — set it once, it logs itself every period, free on every plan
• Every ledger keeps its own currency
• A running activity log of who added or changed what
• One small banner ad on the summary screen for free users — never on the screens where you enter money or settle up
• 18 languages
Cosum is built and maintained by one developer. Feedback goes straight to a real person, not a ticket queue.
COSUM PREMIUM
Premium removes the ad, raises your ledger and participant limits, lifts the daily entry cap, and unlocks a one-page PDF settle-up report you can share when a ledger is done.
Cosum Premium is offered as a Monthly (1 month) or Yearly (12 months) auto-renewing subscription; prices are shown in the app and vary by region. Payment is charged to your Apple Account at confirmation of purchase and the subscription renews automatically unless turned off at least 24 hours before the end of the current period. Manage or cancel any time in your App Store account settings. If you don't subscribe, Cosum stays fully usable for free.
Privacy Policy & Terms of Service: cosum.app/privacy · cosum.app/terms
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• New: Invite a friend — you both earn a free active ledger slot once you split a real expense together.
• If your friend upgrades to Premium quickly, you earn a free week of Premium too.
• General improvements and bug fixes.
The developer, OGUZHAN OZGOKCE, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- User Content
- Identifiers
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Financial Info
- Contact Info
- User Content
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- OGUZHAN OZGOKCE
- Size
- 80.8 MB
- Category
- Finance
- Compatibility
Requires iOS 18.2 or later.
- iPhone
Requires iOS 18.2 or later. - iPad
Requires iPadOS 18.2 or later. - Mac
Requires macOS 15.2 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.2 or later.
- iPhone
- Languages
English and 17 more
- English, Arabic, Dutch, French, German, Indonesian, Italian, Japanese, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Swahili, Thai, Turkish, Ukrainian, Vietnamese
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- Premium Yearly $19.99
- Premium Monthly $2.99
- Copyright
- © 2026 Oğuzhan Özgökce