Unit Converter vs UnitStack
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Unit Converter
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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!
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.
- Stack multiple conversions
- Persistent values
- Custom units of measure
- Minimalist interface
- Custom color themes
- Currency conversion
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Unit Converter ships an update daily, UnitStack every 2 days. The most recent releases landed on February 23, 2026 and September 17, 2026 respectively.
| Parameter | Unit Converter | UnitStack |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Daily — better | Every 2 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 13.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 20 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | SEOKWON YANG | Michael Yang |
In-app purchases
Unit Converter
No in-app purchases
UnitStack
No in-app purchases





