Comparison

Conversions vs UnitStack

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

Head to head
About

Conversions

Easily convert over 100 units across various categories like temperature, length, and weight. View conversion formulas, copy results, and share them directly. Enjoy a private, ad-free experience with a native iOS design.

Highlights
  • Convert 100+ units
  • Temperature, length, weight conversions
  • View conversion formulas
  • Copy and share conversions
  • Native iOS design
  • Ad-free experience
Features
Read full description

Conversions helps you convert different units of measurement, including units of temperature, length, or weight. Use Conversions to convert common measures, such as Fahrenheit to Celsius, meters to feet, and pounds to kilograms, or more technical ones, such as Joule to Kilowatt Hour, Newton to Pound-Force, and Pascal to Bar. Features: · Convert over 100 units across categories like angle, area, data, energy, force, length, power, pressure, speed, temperature, time, volume, and weight · Keep track of up to 100 of your recent conversions · Save up to 25 favorites for quick access · View the exact formulas behind each conversion · Look up unit details, including symbols, measurement systems, and conversion formulas for related units · Copy your conversions to clipboard or share directly with others · Enjoy a native iOS design, using Apple’s latest frameworks and UI guidelines Conversions provides a private and secure, ad-free experience—no ads, no tracking, ever. Terms of Service: https://crater.tools/conversions/terms-of-service Privacy Policy: https://crater.tools/conversions/privacy-policy

About

UnitStack

This utility app allows for simultaneous unit and currency conversions, saving your progress and custom units. Its minimalist design ensures a clear and efficient user experience for all your measurement needs.

Highlights
  • Stack multiple conversions
  • Persistent values
  • Custom units of measure
  • Minimalist interface
  • Custom color themes
  • Currency conversion
Features
Read full description

UnitStack lets you stack multiple unit conversions at once—so you never have to switch units or reselect conversions again. Your conversions are always saved. Open the app and start typing. Add custom units too—like that old reliable sauce spoon. Built for speed and clarity • Stack multiple conversions at once • Persistent values — pick up where you left off • Minimal, distraction-free interface • Custom color themes, including your own • Support for custom units of measure Whether you’re comparing measurements, converting currencies, or working across systems, UnitStack keeps everything visible and friction-free. Currency exchange rates are provided by Frankfurter (ECB reference rates).

Screenshots

Conversions4 screens
UnitStack4 screens

Verdict

The call

The clearest difference is update cadence: UnitStack at every 2 days against Conversions's every 2 weeks. On price, rating, ratings volume and ads 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.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Conversions against 5.0 for UnitStack. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

UpkeepUpdate frequency

Conversions ships an update every 2 weeks, UnitStack every 2 days. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

Scorecard1 real difference · 9 level
Conversions versus UnitStack: the parameters behind the verdict, then further details
ParameterConversionsUnitStack
PriceFreeFree
Rating5.0 (2 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings2 — better1
Update frequencyEvery 2 weeksEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhoneiPhone, iPad — better
Requires iOS18.618.6
Further details — not scored
Size6 MB4 MB
Age rating4+4+
DeveloperPiotr BakkerMichael Yang

Customer experience

Conversions

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

UnitStack

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Conversions

No in-app purchases

None

UnitStack

No in-app purchases

Questions

Is Conversions free?
Conversions is free to download, with no in-app purchases.
Is UnitStack free?
UnitStack is free to download, with no in-app purchases.
Which has better reviews, Conversions or UnitStack?
Conversions and UnitStack are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.
Do Conversions or UnitStack have ads?
Neither Conversions nor UnitStack shows ads.
Which is updated more often, Conversions or UnitStack?
Conversions ships an update every 2 weeks, and UnitStack every 2 days. Most recently, Conversions was updated on November 4, 2026 and UnitStack on October 31, 2026.

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