Comparison

ReadableCalc vs Stopwatch Library

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ReadableCalc

Features
Read full description

ReadableCalc is a calculator app that displays large numbers—like 3 trillion 500 billion—in readable units. It’s designed to make extremely large numbers more intuitive at a glance. Main Features • Supports four basic operations (+, −, ×, ÷) • Displays results in English numeric units for easy readability • Handles decimals and negative numbers • DEL button for deleting one character at a time (Long press to clear the entire expression) • Long press on expressions or results to copy • Tap on the “readable” result to toggle display between: • Short scale / Long scale / Kanji numerals Additional features in landscape mode: • “00”, “000”, and “0000” buttons for quickly adding zeros • “x²” and “x³” buttons for quick exponentiation Note: • Numbers exceeding 200 digits may be rounded due to calculation and display limitations. Please be cautious if you need high precision. • Short scale and Long scale support numbers up to 10^198. • Kanji numeral display supports up to 10^72. Larger numbers are shown in Arabic numerals instead.

About

Stopwatch Library

Read full description

複数のストップウォッチを表示させることができます。 アナログかデジタルかは選んでください。

Screenshots

ReadableCalc3 screens
Stopwatch Library4 screens

Verdict

The call

The clearest difference is in-app purchases: ReadableCalc at none against Stopwatch Library's 1. ReadableCalc also leads on iOS requirement (12.0 vs 17.0). Stopwatch Library's advantage is update cadence (every 3 days vs weekly). On price, 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. Stopwatch Library sells 1 one-off in-app purchase. ReadableCalc asks for nothing beyond the download.

UpkeepUpdate frequency

ReadableCalc ships an update weekly, Stopwatch Library every 3 days. The most recent releases landed on October 7, 2026 and October 13, 2026 respectively.

Scorecard3 real differences · 3 level
ReadableCalc versus Stopwatch Library: the parameters behind the verdict, then further details
ParameterReadableCalcStopwatch Library
PriceFreeFree
Update frequencyWeeklyEvery 3 days — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better17.0
Further details — not scored
Size28 MB5 MB
Age rating4+4+
DeveloperYONAGARE LABNaoyuki Hasegawa

In-app purchases

None

ReadableCalc

No in-app purchases

1 purchases

Stopwatch Library

One-time1
  • 広告を削除$2.99

Questions

Is ReadableCalc free?
ReadableCalc is free to download, with no in-app purchases.
Is Stopwatch Library free?
Stopwatch Library is free to download, with in-app purchases available.
Do ReadableCalc or Stopwatch Library have ads?
Neither ReadableCalc nor Stopwatch Library shows ads.
Which is updated more often, ReadableCalc or Stopwatch Library?
ReadableCalc ships an update weekly, and Stopwatch Library every 3 days. Most recently, ReadableCalc was updated on October 7, 2026 and Stopwatch Library on October 13, 2026.

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