CoTally is a family expense-tracking Progressive Web App (PWA) designed to combine shared household budgets with private personal records. Its developer describes offline expense entry, later synchronization to Supabase, and conversion into a household base currency. Those are reported design goals and implementation details—not independently verified guarantees about privacy, sync reliability, or accounting accuracy.
What CoTally is designed to do
In his October 1, 2026, project article, developer Levin Siju describes CoTally as a household tool for tracking shared budgets, balancing debts, and handling expenses across currencies. The intended distinction is that household members can see shared costs while individual spending, private debts, and savings goals remain personal. The article gives AED, INR, USD, EUR, GBP, and SAR as examples of currencies used in international households; it does not establish that this is the complete list supported by the app.
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The developer says the app is live at cotally.vercel.app and free to use. That is a time-sensitive statement from the project article, not confirmation of current availability, pricing terms, or service guarantees. The name alone is not enough to identify this PWA with a similarly named app whose support materials describe iCloud sync.
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According to the project article, shared expenses such as groceries, utilities, and dining out contribute to totals and budget limits visible to household members. Personal spending, private debts, and individual savings goals are intended to be hidden from other members using Supabase Row-Level Security (RLS).
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RLS is a database access-control mechanism, not proof that an app’s privacy rules are correct. Supabase’s security guidance says to enable RLS on exposed tables and configure least-privilege policies. It permits a publishable key in frontend code when RLS is in place, but says service-role and secret keys must never be exposed there because they bypass RLS.
The project article does not document CoTally’s actual policies, household membership checks, table grants, invitation handling, threat model, encryption approach, or data-retention rules. It therefore does not establish that every access path is appropriately restricted. The description also does not support calling the app audited, end-to-end encrypted, or completely private.
Rank #2
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- User-Friendly Layout - The budget planner features a user-friendly layout designed for easy navigation and organization. Each month, you'll find dedicated budget pages where you can set financial goals, track your income, and plan your expenses. Additional sections include debt trackers, savings goals, bill payment trackers, and more, making it simple to stay on top of your finances.
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- Reliable and Convenient Design - Our monthly budget planner is designed for your convenience and built to last. The elastic band keeps everything securely in place, and the dual-sided pocket provides extra storage. Experience a budget planner that combines practicality and durability.
- Master Budgeting with Ease - Our financial planner includes a complete guidebook that provides valuable insights and instructions for optimal usage. From setting financial goals to tracking expenses, this guidebook offers step-by-step guidance and practical tips. Whether you're new to budgeting or an experienced user, this resource will help you make the most of your budget planner, empowering you to achieve financial success.
What the published technology stack includes
The developer’s article lists this implementation stack. It is a description of the published project, not an independent code review or confirmation that the current deployment still uses every component.
The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →| Area | Reported components |
|---|---|
| Frontend | React 18, Vite, and TypeScript |
| Interface and visuals | Tailwind CSS, shadcn/ui, Radix UI primitives, Lucide Icons, Framer Motion, and Recharts |
| Backend and authentication | Supabase PostgreSQL and Supabase Auth, with Row-Level Security |
| Data fetching and caching | TanStack React Query |
| Offline support | VitePWA/Workbox and a localStorage event queue |
| Quick-add service | A Supabase Edge Function named quick-add |
How offline entry and synchronization are supposed to work
The developer says Workbox precaches static app assets and that recent transactions and category data are cached locally. For an expense entered offline, the described flow is:
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- The app assigns the expense a local ID and places it in a queue stored in localStorage.
- The entry appears in the transaction feed with a waiting-to-sync status.
- When the browser reconnects, a sync hook sends queued entries sequentially to Supabase.
- After synchronization, the local entry is replaced with a permanent database record.
This describes the intended flow, but the article does not establish how the app handles two devices editing the same record, rejected uploads, repeated failures, or browser storage that is cleared or evicted. It also does not demonstrate that queued entries survive every interruption. The developer characterizes the offline app shell as opening in “0ms,” but provides no measurement method, device, or test conditions; that figure should not be read as an independently verified performance result.
How the app handles multiple currencies
The project article says CoTally fetches exchange rates from open.er-api.com, caches rates in memory to reduce repeat requests, and calculates an amount_base value in the household’s chosen base currency. It also says changing the household base currency migrates past records and recalculates budget progress.
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The article does not specify how often rates refresh, which rate timestamp applies to a transaction, whether the original amount and rate are retained, or how rounding and offline conversion work. It also does not explain how historical conversions can be audited. On the available description, CoTally’s conversion should not be treated as an exact real-time quote or an accounting- or tax-grade record.
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Quick-add and category shortcuts
The developer describes iOS and Android shortcuts that collect an amount, category, and note, then send a small payload to the quick-add Supabase Edge Function. A contextual category dictionary is said to map examples such as “Stationary” to Education, “Shein” to Shopping, and “Karak” to Dining. The article claims quick-add logging takes under two seconds, but supplies no benchmark method or conditions, so the timing is not independently established.
Best Value
- Effective Budget Planning - Take control of your finances with the budget account book. This comprehensive planner allows you to plan and track your income, expenses, savings, and financial goals in one convenient place. With its intuitive layout and easy-to-use sections, you can stay organized and make informed decisions to achieve financial success.
- User-Friendly Layout - The budget planner features a user-friendly layout designed for easy navigation and organization. Each month, you'll find dedicated budget pages where you can set financial goals, track your income, and plan your expenses. Additional sections include debt trackers, savings goals, bill payment trackers, and more, making it simple to stay on top of your finances.
- Undated Monthly Calendar & Bonus Stickers - Featuring undated calendar each month, you'll have ample space to mark paydays, bills due, appointments, and important dates. Say goodbye to difficult writing spaces. Plus, we've included 3 cute sticker sheets that allow you to personalize your financial organizer and make budgeting more fun. Dates are not pre-printed and are completed by the user.
- Reliable and Convenient Design - Our monthly budget planner is designed for your convenience and built to last. The elastic band keeps everything securely in place, and the dual-sided pocket provides extra storage. Experience a budget planner that combines practicality and durability.
- Master Budgeting with Ease - Our financial planner includes a complete guidebook that provides valuable insights and instructions for optimal usage. From setting financial goals to tracking expenses, this guidebook offers step-by-step guidance and practical tips. Whether you're new to budgeting or an experienced user, this resource will help you make the most of your budget planner, empowering you to achieve financial success.
What to check before relying on a family expense tracker
CoTally’s project description identifies useful evaluation questions for this app or any similar tool:
- Sharing boundaries: Which records, totals, and budgets can each household member see?
- Offline failure behavior: Can you tell what is pending, and what happens if an upload fails or two devices change the same record?
- Currency records: Does a transaction preserve its original amount, the conversion rate, and the rate’s effective date?
- Data location: Which information is stored on the device and which is sent to a service provider?
- Security evidence: Have the code, database policies, and deployed behavior been independently reviewed?
The project article describes intended features but provides no controlled comparison with competing apps, independent test results, or security audit. Readers should distinguish the described design from assurances established by verified implementation or testing.
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