Comparison

Unit Converter vs UnitStack

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

Head to head
About

Unit Converter

Features
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Unit Converter - SLOX is a simple and powerful unit conversion app. [Features] • 8 categories: Length, Weight, Temperature, Volume, Area, Speed, Time, Data • Real-time conversion • 8 languages supported (English, Korean, Japanese, Chinese, Spanish, German, French, Portuguese) • Beautiful dark theme • Copy results to clipboard • Conversion formula display [Supported Units] Length: m, km, cm, mm, mi, yd, ft, in Weight: kg, g, mg, lb, oz, t Temperature: °C, °F, K Volume: L, mL, gal, qt, pt, cup, fl oz Area: m², km², cm², ha, ac, ft², in² Speed: m/s, km/h, mph, kn, ft/s Time: s, min, h, d, wk, mo, yr Data: B, KB, MB, GB, TB, bit Convert any unit you need, instantly!

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

Unit Converter3 screens
UnitStack4 screens

Verdict

The call

The clearest difference is update cadence: Unit Converter at daily against UnitStack's every 2 days. Unit Converter also leads on iOS requirement (13.0 vs 18.6). 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

Unit Converter ships an update daily, UnitStack every 2 days. The most recent releases landed on February 23, 2026 and September 17, 2026 respectively.

Scorecard2 real differences · 7 level
Unit Converter versus UnitStack: the parameters behind the verdict, then further details
ParameterUnit ConverterUnitStack
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyDaily — betterEvery 2 days
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPodiPhone, iPad
Requires iOS13.0 — better18.6
Further details — not scored
Size20 MB4 MB
Age rating4+4+
DeveloperSEOKWON YANGMichael Yang

In-app purchases

None

Unit Converter

No in-app purchases

None

UnitStack

No in-app purchases

Questions

Is Unit Converter free?
Unit Converter is free to download, with no in-app purchases.
Is UnitStack free?
UnitStack is free to download, with no in-app purchases.
Do Unit Converter or UnitStack have ads?
Neither Unit Converter nor UnitStack shows ads.
Which is updated more often, Unit Converter or UnitStack?
Unit Converter ships an update daily, and UnitStack every 2 days. Most recently, Unit Converter was updated on February 23, 2026 and UnitStack on September 17, 2026.

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