# Unit Converter Calculator Pro vs Smart Event Tracker

The clearest difference is in-app purchases: Smart Event Tracker at none against Unit Converter Calculator Pro's 4. Smart Event Tracker also leads on ads (none vs shown). Unit Converter Calculator Pro's advantage is update cadence (monthly vs every 19 months) and device support (4 vs 2). On price there is nothing between them.

Both are free to download. Unit Converter Calculator Pro sells 4 one-off in-app purchases. Smart Event Tracker asks for nothing beyond the download.

Unit Converter Calculator Pro ships an update monthly, Smart Event Tracker every 19 months. The most recent releases landed on October 26, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Unit Converter Calculator Pro | Smart Event Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (993 ratings)](https://appshunter.io/ios/app/unit-converter-calculator-pro/id1343845631/reviews)** | — |
| Number of ratings | **993** | — |
| Positive reviews | 76.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 19 months |
| Monetization | Free with in-app purchases | — |
| Size | 37 MB | 6 MB |
| Requires iOS | **13.0** | 18.2 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Rome Rock LLC](https://appshunter.io/developer/1190244007) | [Prakash Parupudi](https://appshunter.io/developer/1800398100) |

## What reviewers say

### Unit Converter Calculator Pro

[App page](https://appshunter.io/ios/app/unit-converter-calculator-pro/id1343845631)

Easily convert between metric and imperial units for a wide range of measurements including area, speed, temperature, and weight. Supports scientific prefixes and offers a history of your conversions. No internet connection required.

**Highlights:** Metric to Imperial unit conversion, Imperial to Metric unit conversion, Area, speed, temperature, volume, weight conversions, Scientific prefixes support, Conversion history, Offline functionality

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads & Unlock Themes | $2.99 | one-time |
| Remove Ads & Unlock Themes 1 | $4.99 | one-time |
| Remove Ads & Unlock Themes 2 | $6.99 | one-time |
| Remove Ads & Unlock Themes 3 | $9.99 | one-time |

**What reviewers like**

- 🚀 Easy & accurate
- 🚀 Excellent Tool
- 👍 Goog for social
- 👍 Excelente para mi trabajo
- 👍 Sencillez

**What reviewers complain about**

- 👎 Hard to use interface
- 👎 Lacks pressure units
- 👎 No reverse button
- 👎 Metric to imperial format not user-friendly

**Reported bugs**

- 🐛 Changing to something else

**Requested features**

- 💡 Favorite conversations
- 💡 Color-coded sections
- 💡 Money conversion


### Smart Event Tracker

[App page](https://appshunter.io/ios/app/smart-event-tracker/id6742869857)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Unit Converter Calculator Pro free?

Unit Converter Calculator Pro is free to download, with in-app purchases available.

### Is Smart Event Tracker free?

Smart Event Tracker is free to download, with no in-app purchases.

### Do Unit Converter Calculator Pro or Smart Event Tracker have ads?

Unit Converter Calculator Pro shows ads; Smart Event Tracker does not.

### Which is updated more often, Unit Converter Calculator Pro or Smart Event Tracker?

Unit Converter Calculator Pro ships an update monthly, and Smart Event Tracker every 19 months. Most recently, Unit Converter Calculator Pro was updated on October 26, 2026 and Smart Event Tracker on October 17, 2026.

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