Smart Green Converter vs UnitStack
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Smart Green Converter
Easily convert between various units of measurement for gases, including length, power, volume, mass, and pressure. Share your conversion results via email or SMS, or copy them to your notes.
- Unit of Measurement Conversion
- Length Units
- Power Units
- Volume Units
- Mass Units
- Pressure Units
- Share Conversion Results
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The Green Flame Gas converter mobile application that will help you convert UOMs (Units of Measurements) from one to another, You can share the conversion results with others through mails, SMS, etc... or it can be copied to your notes. Those UOMs are as follow: - Length Units. - Power Units. - Dynamic Viscosity Units. - Heat Flux Units. - Volume Units. - Energy Unit. - Kinematic Viscosity Units. - Specific Energy Units. - Molar Flow-rate Units. - Mass Units. - Mass Flow-rate Units. - Specific Heat Units. - Volumetric Flow-rate Units. - Density Units. - Heat Transfer Coefficient Units. - Pressure Units. - Area Units. - Thermal Conductivity Units. Enjoy.
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: UnitStack at every 2 days against Smart Green Converter's every 7 months. Smart Green Converter's advantage is iOS requirement (14.0 vs 18.6). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Smart Green Converter against 5.0 for UnitStack. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Smart Green Converter ships an update every 7 months, UnitStack every 2 days. The most recent releases landed on October 5, 2026 and October 4, 2026 respectively.
| Parameter | Smart Green Converter | UnitStack |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 7 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 18 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | The Green Flame Gas Co | Michael Yang |
Customer experience
Smart Green Converter
UnitStack
In-app purchases
Smart Green Converter
No in-app purchases
UnitStack
No in-app purchases
Questions
Is Smart Green Converter free?
Is UnitStack free?
Which has better reviews, Smart Green Converter or UnitStack?
Do Smart Green Converter or UnitStack have ads?
Which is updated more often, Smart Green Converter or UnitStack?
Other comparisons
