# Conversion Calculator Units vs SmartProBono

The clearest difference is in-app purchases: SmartProBono at none against Conversion Calculator Units's 1. SmartProBono also leads on ads (none vs shown) and rating (5.0 vs 4.7). Conversion Calculator Units's advantage is ratings volume (5K vs 4). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Conversion Calculator Units sells 1 one-off in-app purchase. SmartProBono asks for nothing beyond the download.

SmartProBono holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Conversion Calculator Units has 5K ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 82% of Conversion Calculator Units's written reviews are positive against 100% of SmartProBono's.

Conversion Calculator Units ships an update every 2 months, SmartProBono every 3 weeks. The most recent releases landed on October 13, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Conversion Calculator Units | SmartProBono |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (5K ratings)](https://appshunter.io/ios/app/conversion-calculator-units/id727632233/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/smartprobono/id6759347017/reviews)** |
| Number of ratings | **5K** | 4 |
| Positive reviews | 82.1% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 41 MB | 30 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [RV AppStudios LLC](https://appshunter.io/developer/340181308) | [Baheem Ferrell](https://appshunter.io/developer/1812780567) |

## What reviewers say

### Conversion Calculator Units

[App page](https://appshunter.io/ios/app/conversion-calculator-units/id727632233)

This app offers a simple and powerful way to convert between over 140 units across 12 categories. Easily switch between units, customize your experience with themes, and share your results.

**Highlights:** Converts over 140 units, Supports 12 conversion categories, Customizable themes, Drag and set unit positions, Add units to favorites, Share converted units via email

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |

**What reviewers like**

- 👍 User-friendly
- 🚀 Easy to use
- 💡 Helpful for learning metric system
- 👍 Great for conversions
- 👍 Intuitive interface

**What reviewers complain about**

- 🐛 Ads disrupt usage
- 🐛 Difficult to change units
- 🐛 Lacks portrait mode
- 🐛 Upside-down orientation issues
- 🐛 Cluttered UI design

**Reported bugs**

- Ads not removed after purchase
- Incorrect unit conversions

**Requested features**

- Add pressure conversion units
- Include a basic calculator function
- Implement multi-language support
- Allow customization of unit order


### SmartProBono

[App page](https://appshunter.io/ios/app/smartprobono/id6759347017)

This safety app allows users to easily record audio or video of important moments, automatically capturing location data. It enables sharing of these recordings and location with a trusted contact during emergencies. All recorded events are stored in a history for later review, sharing, or deletion.

**Highlights:** One-tap audio/video recording, Automatic location capture, Add trusted emergency contacts, Share location and recordings, Safety event history, Name and manage events

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Conversion Calculator Units free?

Conversion Calculator Units is free to download, with in-app purchases available.

### Is SmartProBono free?

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

### Which has better reviews, Conversion Calculator Units or SmartProBono?

SmartProBono is rated higher. Conversion Calculator Units averages 4.7 out of 5 from 5K ratings, while SmartProBono averages 5.0 from 4 ratings.

### Do Conversion Calculator Units or SmartProBono have ads?

Conversion Calculator Units shows ads; SmartProBono does not.

### Which is updated more often, Conversion Calculator Units or SmartProBono?

Conversion Calculator Units ships an update every 2 months, and SmartProBono every 3 weeks. Most recently, Conversion Calculator Units was updated on October 13, 2026 and SmartProBono on October 2, 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.*