Interest Meter vs 3s Kakeibo
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
Interest Meter
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Do you know exactly how much interest your savings are earning? Interest Meter is a clean, precise calculator for bank deposit interest. It supports both simple and compound interest, and automatically deducts withholding tax (default: Japan's 20.315%) so you can see your real take-home earnings. --- Free Features --- - Simple and compound interest calculation - Compound frequency: yearly, semi-annual, monthly, or **custom** (specify any number of compounding events per year ā e.g. 4 quarterly, 52 weekly, 365 daily) - Flexible deposit period (1 to 50 years) - See pre-tax and after-tax interest at a glance - Year-by-year breakdown chart - Customizable tax rate (default: 20.315%) - Clean, intuitive design --- Premium Features (one-time purchase) --- - Switch the calculator to any of 9 foreign currencies (USD, EUR, GBP, AUD, CNY, HKD, SGD, KRW, THB) - Live exchange rates with a JPY conversion section in the result view - Ad-free experience across the entire app --- Who Is This For? --- - Anyone checking returns on fixed deposits - People who want to see compound interest in action - Savers who want to know their real after-tax yield - Anyone taking the first step toward smarter money management - Foreign-currency depositors who need quick JPY conversions Simple by design. Check your deposit interest today.
3s Kakeibo
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The number one reason expense trackers fail? You forget to log. 3s Kakeibo shrinks the distance to zero. Log an expense right from where you are ā no app launch required: ⢠Home Screen widget: tap a smart preset amount, done (interactive, iOS 17) ⢠Lock Screen widget: see this month's total, tap to log ⢠Action Button & Siri: just say "log with 3s Kakeibo" ⢠Control Center (iOS 18): one swipe, one tap INSIDE THE APP, 3 SECONDS FLAT The keypad is ready the moment the app opens, your last category is pre-selected, and four preset amounts re-order themselves by how often you use them. Mis-tapped? Undo within 10 seconds. NO PAYWALL, NO TRIAL LIMITS ⢠Unlimited history: view and edit every record you ever logged ⢠Monthly reports: category breakdown, month-over-month, daily average ⢠Up to 8 ledgers and custom categories (up to 24) ⢠Full-history CSV export ADS, AND HOW TO REMOVE THEM A banner sits at the bottom of the History and Report tabs ā never on the entry, editing or settings screens, and never while the keyboard is up. One optional one-time purchase, "Remove Ads", makes it disappear for good. It unlocks nothing else, because nothing else is locked. PRIVATE BY DESIGN Your records never leave your device. No accounts, no bank linking, and no analytics. The app works fully offline. Figures shown are informational, based on your own records ā not financial advice.
Screenshots
Verdict
Interest Meter and 3s Kakeibo are too close to call on the numbers: across 6 compared parameters ā price, update cadence, ads and in-app purchases among them ā neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS
Both are free to download. Interest Meter sells 1 one-off in-app purchase and 3s Kakeibo sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Both ship on a similar rhythm, roughly every 3 days. The most recent releases landed on September 9, 2026 and August 12, 2026 respectively.
| Parameter | Interest Meter | 3s Kakeibo |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 days | Every 3 days |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad ā better | iPhone |
| Requires iOS | 16.0 ā better | 17.0 |
| Further details ā not scored | ||
| Size | 6 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Fuji Bit Inc. | 丽佳 ę½ |
In-app purchases
Interest Meter
- Premium$2.99
3s Kakeibo
- Remove Ads$0.99





