SUM+= Simple Expense Tracker vs Fynn
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SUM+= Simple Expense Tracker
This finance app simplifies expense tracking with AI assistance, allowing for quick data entry and powerful analysis through large language models. It prioritizes user control and privacy with local data storage and a minimalist design.
- AI-assisted data entry
- LLM analysis and forecasting
- Minimalist and beautiful design
- Local data storage and privacy
- User-controlled database
- Subscription options with free trial
Read full descriptionHide full description
There are hundreds of expense tracker apps and they all do more or less the same thing. But oddly enough, not a single one suited my needs, so I developed my own. Through small but targeted adjustments, I've developed the app to become my preferred solution: • Control stays with the user while data entry is greatly simplified: The time between "open app" and "entry saved" has been reduced to a minimum. AI can support this process so that in many cases you wouldn't even need to open the app • AI analysis through LLMs: Instead of developing custom analysis logic, the app prepares your data so it can be used directly in Large Language Models like ChatGPT or Claude: for analysis, forecasts and recommendations • Minimalist design: The app is designed to look beautiful and works without distracting extras • Full control & privacy: No login, no account. Data stays locally on your device. You have complete control over your own database. If you want to share your data with an AI, you decide that yourself Financial barriers shouldn't stand in the way of your personal financial planning with Sum. Contact us for individual solutions via the support form. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Fynn
Read full descriptionHide full description
Fynn is your minimalist finance companion. Keep track of your accounts, balances, and everyday spending without the clutter, charts, or complexity you don't need. Open the app and see what matters. Adding expenses is designed to be effortless. Type or dictate naturally, enter the details manually, or let Fynn find transactions in receipts, bills, payment confirmations, and screenshots. Take a photo, choose an image from your library, or paste one from your clipboard. Fynn can even recognize multiple activities at once, so catching up on several expenses doesn't mean entering them one by one. With Apple Intelligence, Fynn understands natural language and helps turn what you type, say, or scan into activities you can review before saving. On supported devices, you can scan receipts directly with your camera, while Siri AI lets you interact with Fynn through natural conversation. Your financial data and AI processing stay on your device. The interface stays focused on your finances. See your total balance at a glance, manage multiple accounts and currencies, and open any account to browse its activity. Natural daily summaries highlight what matters without overwhelming you, while widgets bring useful information to your Home Screen and Lock Screen. Already tracking your finances somewhere else? Fynn can import existing data from Revolut and Cashew, making it easier to get started without leaving your history behind. Fynn respects your time and privacy. No ads. No subscriptions. No unnecessary complexity. It works with or without Apple Intelligence, with fast manual entry always available and optional gentle reminders to help you stay consistent. (Camera scanning requires a device with Apple Intelligence enabled and iOS 27.0 or later.)
Screenshots
Verdict
The clearest difference is in-app purchases: Fynn at none against SUM+= Simple Expense Tracker's 4. SUM+= Simple Expense Tracker's advantage is update cadence (every 3 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. SUM+= Simple Expense Tracker sells 4 in-app purchases, starting at $3.99 per month. Fynn asks for nothing beyond the download.
SUM+= Simple Expense Tracker ships an update every 3 days, Fynn every 2 months. The most recent releases landed on October 24, 2026 and October 12, 2026 respectively.
| Parameter | SUM+= Simple Expense Tracker | Fynn |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 3 days — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | — |
| Devices | iPhone | iPhone |
| Requires iOS | 26.2 | 26.0 — better |
| Further details — not scored | ||
| Size | 28 MB | 55 MB |
| Age rating | 4+ | 4+ |
| Developer | Jonas Zimmermann | Alessio Rubicini |
In-app purchases
SUM+= Simple Expense Tracker
- SUM Pro1 Month trial$3.991 Month
- SUM Pro1 Month trial$22.991 Year
- 7-day TrialFree
- Sum Premium$6.99
Fynn
No in-app purchases









