Comparison

SUM+= Simple Expense Tracker vs Fynn

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read 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: โ€ข 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 โ€ข 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 โ€ข Minimalist design: The app is designed to look beautiful and works without distracting extras โ€ข 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/

About

Fynn

Read full description

Fynn is your minimalist finance companion. Keep track of accounts and transactions without the clutter, charts, or complexity you don't need. Just open the app and see what matters: your balance. Managing money should be effortless. With Apple Intelligence built in, you can add expenses using natural language. Just type or dictate "Add $20 for groceries to my credit card" and Fynn understands. All processing happens on your device, so your data never leaves your iPhone. No cloud, no tracking, no worries. The interface is clean and thoughtful. View your total balance at a glance, manage multiple currencies, and tap through accounts to see transactions. Daily summaries keep you informed without overwhelming you. Widgets bring key insights to your Home or Lock Screen. Fynn respects your time and privacy. No ads. No subscriptions. No unnecessary features. It works beautifully with or without Apple Intelligence. Manual entry is simple and fast. Optional gentle reminders help you stay consistent.

Screenshots

SUM+= Simple Expense Tracker4 screens
Fynn4 screens

Verdict

The call

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 ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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.

UpkeepUpdate frequency

SUM+= Simple Expense Tracker ships an update every 3 days, Fynn every 2 months. The most recent releases landed on September 2, 2026 and September 9, 2026 respectively.

Scorecard2 real differences ยท 6 level
SUM+= Simple Expense Tracker versus Fynn: the parameters behind the verdict, then further details
ParameterSUM+= Simple Expense TrackerFynn
PriceFreeFree
Positive reviews100.0% of reviewsโ€”
Update frequencyEvery 3 days โ€” betterEvery 2 months
AdsNoNo
In-app purchasesYesNo โ€” better
MonetizationFreemiumโ€”
DevicesiPhoneiPhone
Requires iOS26.226.0 โ€” better
Further details โ€” not scored
Size26 MB35 MB
Age rating4+4+
DeveloperJonas ZimmermannAlessio Rubicini

In-app purchases

4 purchases

SUM+= Simple Expense Tracker

Subscriptions2
  • SUM Pro1 Month trial$3.991 Month
  • SUM Pro1 Month trial$22.991 Year
One-time2
  • 7-day TrialFree
  • Sum Premium$6.99
None

Fynn

No in-app purchases

Questions

Is SUM+= Simple Expense Tracker free?
SUM+= Simple Expense Tracker is free to download, with in-app purchases available.
Is Fynn free?
Fynn is free to download, with no in-app purchases.
Do SUM+= Simple Expense Tracker or Fynn have ads?
Neither SUM+= Simple Expense Tracker nor Fynn shows ads.
Which is updated more often, SUM+= Simple Expense Tracker or Fynn?
SUM+= Simple Expense Tracker ships an update every 3 days, and Fynn every 2 months. Most recently, SUM+= Simple Expense Tracker was updated on September 2, 2026 and Fynn on September 9, 2026.

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