Comparison

SUM+= Simple Expense Tracker vs Kakeibo Style

Price, ratings, monetisation and update history for both apps, side by side — 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
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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/

About

Kakeibo Style

Features
Read full description

Kakeibo (家計簿) — meaning "household financial ledger" — is a budgeting method created by Japanese journalist Hani Motoko in 1904. Rather than just tracking what you spend, it asks you to pause and reflect on why you spend. How it works: Every expense is sorted into one of four pillars: - Needs (必要) — essentials like rent, groceries, and bills - Wants (欲しい) — enjoyable but non-essential purchases - Culture (文化) — books, courses, music, and enrichment - Unexpected (予想外) — repairs, medical costs, and surprises At the start of each month, set your income and savings goal. As you spend, Kakeibo shows how your money flows across the four pillars. At the end of the month, reflect on what went well and what you can improve. Features: - Multiple income sources - Fixed costs with categories and month-to-month import - Visual budget bar showing savings, spending, and what's left - Search across all months - Monthly reflection with guided questions - Multi-currency support - Rename and organise expense categories Private by design All your data stays on your device. No accounts, no cloud sync, no analytics. The only network request is loading fonts on first launch. After that, Kakeibo works fully offline. Small, consistent acts of awareness lead to lasting change.

Screenshots

SUM+= Simple Expense Tracker4 screens
Kakeibo Style4 screens

Verdict

The call

The clearest difference is update cadence: SUM+= Simple Expense Tracker at every 3 days against Kakeibo Style's fortnightly. Kakeibo Style's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 26.2). On price, ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. SUM+= Simple Expense Tracker sells 4 in-app purchases, starting at $3.99 per month and Kakeibo Style sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

SUM+= Simple Expense Tracker ships an update every 3 days, Kakeibo Style fortnightly. The most recent releases landed on October 15, 2026 and October 5, 2026 respectively.

Scorecard3 real differences · 7 level
SUM+= Simple Expense Tracker versus Kakeibo Style: the parameters behind the verdict, then further details
ParameterSUM+= Simple Expense TrackerKakeibo Style
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 3 days — betterFortnightly
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS26.215.0 — better
Further details — not scored
Size28 MB44 MB
Age rating4+4+
DeveloperJonas ZimmermannMark Brady

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
2 purchases

Kakeibo Style

One-time2
  • Thank you$0.99
  • A big thank you$1.99

Questions

Is SUM+= Simple Expense Tracker free?
SUM+= Simple Expense Tracker is free to download, with in-app purchases available.
Is Kakeibo Style free?
Kakeibo Style is free to download, with in-app purchases available.
Do SUM+= Simple Expense Tracker or Kakeibo Style have ads?
Neither SUM+= Simple Expense Tracker nor Kakeibo Style shows ads.
Which is updated more often, SUM+= Simple Expense Tracker or Kakeibo Style?
SUM+= Simple Expense Tracker ships an update every 3 days, and Kakeibo Style fortnightly. Most recently, SUM+= Simple Expense Tracker was updated on October 15, 2026 and Kakeibo Style on October 5, 2026.

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