# Unit Converter and Conversion vs Idea Rewind

The clearest difference is ads: Idea Rewind at none against Unit Converter and Conversion's shown. Idea Rewind also leads on update cadence (every 2 days vs every 10 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Unit Converter and Conversion sells 1 one-off in-app purchase and Idea Rewind sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Unit Converter and Conversion ships an update every 10 months, Idea Rewind every 2 days. The most recent releases landed on October 11, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Unit Converter and Conversion | Idea Rewind |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (48 ratings)](https://appshunter.io/ios/app/unit-converter-and-conversion/id1350107532/reviews)** | — |
| Number of ratings | **48** | — |
| Positive reviews | 81.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 10 months | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 42 MB | 42 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Asad Ahsan](https://appshunter.io/developer/1326954499) | [逸飞 闫](https://appshunter.io/developer/6804338112) |

## What reviewers say

### Unit Converter and Conversion

[App page](https://appshunter.io/ios/app/unit-converter-and-conversion/id1350107532)

This app offers a user-friendly interface for converting units across more than 40 categories, including length, weight, volume, and digital storage. It works offline and saves conversion history for future reference. Ideal for students and professionals needing quick and accurate conversions.

**Highlights:** Over 40 conversion categories, Offline functionality, Conversion history saving, User-friendly interface, Supports length, weight, volume, and more, Elegant graphics

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unit Converter Pro | $4.99 | one-time |


### Idea Rewind

[App page](https://appshunter.io/ios/app/idea-rewind-notes-and-recall/id6806823786)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Idea Rewind Pro Monthly | $0.99 | per month |
| Idea Rewind Pro Yearly | $4.99 | per year |
| Idea Rewind Pro Lifetime | $14.99 | one-time |


## Frequently asked questions

### Is Unit Converter and Conversion free?

Unit Converter and Conversion is free to download, with in-app purchases available.

### Is Idea Rewind free?

Idea Rewind is free to download, with in-app purchases available.

### Do Unit Converter and Conversion or Idea Rewind have ads?

Unit Converter and Conversion shows ads; Idea Rewind does not.

### Which is updated more often, Unit Converter and Conversion or Idea Rewind?

Unit Converter and Conversion ships an update every 10 months, and Idea Rewind every 2 days. Most recently, Unit Converter and Conversion was updated on October 11, 2026 and Idea Rewind on October 8, 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.*