Comparison

TinyWatchCalc vs Only One Calculator

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

Head to head
About

TinyWatchCalc

Features
Read full description

A simple calculator for the Apple Watch. Supports addition, subtraction, multiplication and division.

About

Only One Calculator

This utility app offers instant currency exchange and unit conversions, making it ideal for travel and shopping. It features undo/redo functionality for easy editing and supports over 160 currencies with customizable update frequencies. Users can also access calculation history and customize the keyboard.

Highlights
  • Instant currency exchange
  • Unit conversion (length, weight, area, volume, temperature)
  • Undo/Redo functionality
  • History of calculations
  • Customizable keyboard layout
  • Real-time calculation results
Read full description

This calculator has instant currency exchange and unit conversion. With the "Undo" and "Redo" functions, you can go back to the previous steps and edit it. Select a specified currency exchange to be fixed to the calculator. When you input a number or expression, you can instantly know the conversion result, which is convenient for traveling and shopping. Features: • Can select a specified currency exchange and pin it to the calculator. During the input process, you can instantly know the exchange result, which is convenient for travel and shopping. • With the "Undo" and "Redo" functions, the calculator allows you to go back to the previous steps. It keeps up to 300 input steps for your review. So you don't have to worry about re-entering because of any mistakes during input. • Can choose between more than 160 currencies, and the exchange rate is updated manually or automatically per hour, day, or week. • The calculation expression and calculation result are recorded when pressing the equal button or clear button. You can insert the calculation expression or calculation result from a history record into the current calculation expression. • Can edit a very long calculation, and cursor control is very convenient and smooth. • During the input process, the calculation result will be shown instantly without pressing the equal button. • In addition to currency exchange, there are other conversion functions for length, weight, area, volume, and temperature. • If you need the Memory Buttons on traditional calculators, you can add them into the keyboard layout. ** Note: No Scientific Calculation Function. Not suitable for users who need Scientific Calulation. **

Screenshots

TinyWatchCalc1 screens
Only One Calculator4 screens

Verdict

The call

The clearest difference is update cadence: Only One Calculator at every 2 weeks against TinyWatchCalc's every 16 months. 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

TinyWatchCalc ships an update every 16 months, Only One Calculator every 2 weeks. The most recent releases landed on September 28, 2026 and October 7, 2026 respectively.

Scorecard1 real difference · 9 level
TinyWatchCalc versus Only One Calculator: the parameters behind the verdict, then further details
ParameterTinyWatchCalcOnly One Calculator
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 16 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPod, Apple Watch — betteriPhone, iPod
Requires iOS12.011.0 — better
Further details — not scored
Size9 MB34 MB
Age rating4+4+
DeveloperPeter EntwistleJia Hua Huang

In-app purchases

None

TinyWatchCalc

No in-app purchases

None

Only One Calculator

No in-app purchases

Questions

Is TinyWatchCalc free?
TinyWatchCalc is free to download, with no in-app purchases.
Is Only One Calculator free?
Only One Calculator is free to download, with no in-app purchases.
Do TinyWatchCalc or Only One Calculator have ads?
Neither TinyWatchCalc nor Only One Calculator shows ads.
Which is updated more often, TinyWatchCalc or Only One Calculator?
TinyWatchCalc ships an update every 16 months, and Only One Calculator every 2 weeks. Most recently, TinyWatchCalc was updated on September 28, 2026 and Only One Calculator on October 7, 2026.

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