Sub vs Interest Meter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sub
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Clean up your monthly expenses with Sub-Scrub! Easily manage your subscriptions, track fixed costs, and prevent unwanted renewals with our privacy-focused tracker. [Why Sub-Scrub?] - Forgot to cancel a trial and got charged? - Don't know how much you spend on subscriptions in total? - Want to keep certain subscriptions private? Sub-Scrub solves these problems simply and securely. [Key Features] ◆ Visualize Your Expenses Automatically calculate your monthly and yearly total. Seeing the numbers is the first step to saving money. ◆ Renewal Reminders Get notified 3 days before a payment is due. Never pay for an unused service again. ◆ Secret Mode (Premium) Hide private subscriptions behind a passcode or FaceID. Includes a "Camouflage" feature to disguise notification messages as system updates, keeping your privacy secure even on the lock screen. ◆ Secure & Private All data is stored locally on your device. No external servers, no data leaks. [Get Started] Add your subscriptions now and start decluttering your fixed costs!
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 — 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.
Screenshots
Verdict
The clearest difference is update cadence: Interest Meter at every 3 days against Sub's every 8 days. On price, ads, in-app purchases 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
Both are free to download. Sub sells 1 one-off in-app purchase and Interest Meter sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Sub ships an update every 8 days, Interest Meter every 3 days. The most recent releases landed on September 30, 2026 and September 9, 2026 respectively.
| Parameter | Sub | Interest Meter |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 8 days | Every 3 days — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.6 | 16.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 6 MB |
| Age rating | 9+ | 4+ |
| Developer | Taisei Matsuo | Fuji Bit Inc. |
In-app purchases
Sub
- Premium Plan$2.99
Interest Meter
- Premium$2.99








