# Units Converter for Engineers vs Trial Alert

Units Converter for Engineers and Trial Alert both sit at 3.0 stars, but that hides the real split: 50% of Units Converter for Engineers's written reviews are positive against 0% of Trial Alert's. Trial Alert's advantage is in-app purchases (none vs 2) and update cadence (every 3 days vs every 5 weeks). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Units Converter for Engineers sells 2 one-off in-app purchases. Trial Alert asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 3.0 for Units Converter for Engineers against 3.0 for Trial Alert. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews are what separate them: 50% of Units Converter for Engineers's written reviews are positive against 0% of Trial Alert's.

Units Converter for Engineers ships an update every 5 weeks, Trial Alert every 3 days. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Units Converter for Engineers | Trial Alert |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/units-converter-for-engineers/id1018604081/reviews) | [3.0 (1 ratings)](https://appshunter.io/ios/app/trial-alert-avoid-auto-bills/id6739868277/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | **50.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 5 MB | 30 MB |
| Requires iOS | 16.6 | **12.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Lucy Enterprises](https://appshunter.io/developer/1656612108) | [Benjamin Rhodes-Kropf](https://appshunter.io/developer/1573646019) |

## What reviewers say

### Units Converter for Engineers

[App page](https://appshunter.io/ios/app/units-converter-for-engineers/id1018604081)

This tool allows professionals and students to convert units and currencies using dimensional analysis. It supports a vast number of unit combinations and includes physical constants. Currency rates are updated monthly.

**Highlights:** Free-form unit conversion via dimensional analysis, Supports over 300 single units, Supports over 165 currencies with automatic updates, Includes dozens of physical constants, Identifies unit mismatches, Glossary of available units

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock all features | $0.99 | one-time |
| Remove ads | $1.99 | one-time |


### Trial Alert

[App page](https://appshunter.io/ios/app/trial-alert-avoid-auto-bills/id6739868277)

This app helps you manage free trials and subscriptions. Get timely reminders before trials end to avoid unwanted charges. Easily track active subscriptions and their remaining days.

**Highlights:** Track subscription trials, Receive expiry reminders, Add trials quickly, Swipe to remove trials, View active trials, Monitor remaining days

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Units Converter for Engineers free?

Units Converter for Engineers is free to download, with in-app purchases available.

### Is Trial Alert free?

Trial Alert is free to download, with no in-app purchases.

### Which has better reviews, Units Converter for Engineers or Trial Alert?

Units Converter for Engineers and Trial Alert are both rated 3.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Units Converter for Engineers or Trial Alert have ads?

Neither Units Converter for Engineers nor Trial Alert shows ads.

### Which is updated more often, Units Converter for Engineers or Trial Alert?

Units Converter for Engineers ships an update every 5 weeks, and Trial Alert every 3 days. Most recently, Units Converter for Engineers was updated on November 1, 2026 and Trial Alert on October 30, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*