Comparison

SUM+= Simple Expense Tracker vs Budget Ninja

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
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: • 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

Budget Ninja

Features
Read full description

Your bank statement says "Groceries". You remember bread, wine, and cleaning supplies. Budget Ninja helps you track money the way it actually happens—with categories that reflect real life, not guesses. THE PROBLEM WITH MOST BUDGETING You spend £45 at the shop. Your banking app files it under "Groceries". But what did you actually buy? Was it food? Household items? A gift? When categories are too broad, it's hard to make confident decisions about where your money goes. A DIFFERENT APPROACH Budget Ninja lets you split that £45 into what you actually bought: • £18 Food • £12 Wine & Drinks • £10 Toiletries • £5 Cleaning Supplies Your categories now tell the truth. Your budget reflects reality. HOW IT WORKS Create custom categories that match how you think about money. Split purchases into multiple categories. Add notes to remember details. Watch your monthly budget update in real-time. COLLABORATE WITH OTHERS Share budgets with partners, flatmates, or family. Everyone can add expenses and see updates instantly. Perfect for household budgets or shared expenses. ALWAYS IN SYNC Add an expense on your iPhone—see it immediately on the web. Everything synchronises automatically across all your devices. WHAT YOU CAN DO • Create monthly budgets for income and expenses • Split purchases into meaningful categories • Track daily spending with notes • Share budgets with others • Synchronise across iPhone and web • Access your budgets offline WHO THIS IS FOR People tired of vague categories. Couples managing household finances together. Flatmates tracking shared expenses. Anyone who wants to understand where their money actually goes. YOUR DATA STAYS YOURS Your financial data is protected and never sold or used for advertising. No tracking, no adverts.

Screenshots

SUM+= Simple Expense Tracker4 screens
Budget Ninja4 screens

Verdict

The call

The clearest difference is in-app purchases: Budget Ninja at none against SUM+= Simple Expense Tracker's 4. Budget Ninja also leads on iOS requirement (17.6 vs 26.2). On price, update cadence, ads and device support 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. Budget Ninja asks for nothing beyond the download.

UpkeepUpdate frequency

SUM+= Simple Expense Tracker ships an update every 4 days, Budget Ninja every 5 days. The most recent releases landed on October 31, 2026 and October 28, 2026 respectively.

Scorecard2 real differences · 8 level
SUM+= Simple Expense Tracker versus Budget Ninja: the parameters behind the verdict, then further details
ParameterSUM+= Simple Expense TrackerBudget Ninja
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 4 days — betterEvery 5 days
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhoneiPhone
Requires iOS26.217.6 — better
Further details — not scored
Size28 MB5 MB
Age rating4+4+
DeveloperJonas ZimmermannJakub Jawor

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

Budget Ninja

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 Budget Ninja free?
Budget Ninja is free to download, with no in-app purchases.
Do SUM+= Simple Expense Tracker or Budget Ninja have ads?
Neither SUM+= Simple Expense Tracker nor Budget Ninja shows ads.
Which is updated more often, SUM+= Simple Expense Tracker or Budget Ninja?
SUM+= Simple Expense Tracker ships an update every 4 days, and Budget Ninja every 5 days. Most recently, SUM+= Simple Expense Tracker was updated on October 31, 2026 and Budget Ninja on October 28, 2026.

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