PrimeCalc vs kong calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PrimeCalc
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--- PrimeCalc feature --- ■ Normal arithmetic operation (×, /, +, -) is available. ■ prime: integer calculation (Division remainder ÷, prime factorization p) can be done. (You can also exponentiate.) ■ auto: Automatic calculation, memory storage, history recording is possible. ■ global: Digit display of countries around the world is possible. （千、万、億、兆、京、垓、・・・） ■ iPhone / iPad is available. Free. We are displaying advertisements. Caution) In case of large number, calculation error etc. may occur. Please use it together with other calculator. If you have comments, questions, etc., please email or bulletin board. http: //www.eonet.ne.jp/~treechart/
kong calculator
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It is a simple calculator that provides a calculation history function.
Screenshots
Verdict
The clearest difference is update cadence: kong calculator at every 4 days against PrimeCalc's every 5 weeks. PrimeCalc's advantage is iOS requirement (12.0 vs 15.0). 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. Neither carries in-app purchases, so what you see is what you pay.
PrimeCalc ships an update every 5 weeks, kong calculator every 4 days. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.
| Parameter | PrimeCalc | kong calculator |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 weeks | Every 4 days — better |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 12 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | Yutaka Nakao | Changyeol Seo |
In-app purchases
PrimeCalc
No in-app purchases
kong calculator
No in-app purchases
Questions
Is PrimeCalc free?
Is kong calculator free?
Do PrimeCalc or kong calculator have ads?
Which is updated more often, PrimeCalc or kong calculator?
Other comparisons
