Kalc vs Thumb calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Kalc
This utility app offers a unit converter, calculator, and world clock. Its user-friendly interface is designed for quick access to everyday calculations and conversions.
- Unit converter
- Calculator
- World clock
- Simple UI
- Quick results
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Unit Converter, Calculator, and World Clock. The simple & clean UI to get the results you need for everyday use as quickly as possible.
Thumb calculator
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A calculator that is easy to operate with just the thumb of one hand, even on large-screen smartphones. *Specially placed numeric keypad
Screenshots
Verdict
The clearest difference is ads: Kalc at none against Thumb calculator's shown. Kalc also leads on iOS requirement (13.4 vs 15.8.3). On price, update cadence, 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. Neither carries in-app purchases, so what you see is what you pay.
Kalc ships an update every 9 days, Thumb calculator every 2 weeks. The most recent releases landed on October 23, 2026 and October 4, 2026 respectively.
| Parameter | Kalc | Thumb calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (3 ratings) — better | — |
| Positive reviews | 96.2% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 9 days — better | Every 2 weeks |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.4 — better | 15.8.3 |
| Further details — not scored | ||
| Size | 24 MB | 35 MB |
| Age rating | 4+ | 4+ |
| Developer | YUTA OKAJIMA | Hideaki Uchikoshi |
In-app purchases
Kalc
No in-app purchases
Thumb calculator
No in-app purchases
