# Chemistry Solver AI vs R2D2Reader

The clearest difference is in-app purchases: R2D2Reader at none against Chemistry Solver AI's 2. R2D2Reader also leads on update cadence (every 2 weeks vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Chemistry Solver AI sells 2 in-app purchases, starting at $4.99 per 7 days. R2D2Reader asks for nothing beyond the download.

Chemistry Solver AI ships an update every 4 months, R2D2Reader every 2 weeks. Both last shipped on October 2, 2026.

## The numbers

| Metric | Chemistry Solver AI | R2D2Reader |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Size | 24 MB | 14 MB |
| Requires iOS | 18.0 | **17.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ilayda Kizil](https://appshunter.io/developer/1819099692) | [Trung Huynh](https://appshunter.io/developer/1099811794) |

## What reviewers say

### Chemistry Solver AI

[App page](https://appshunter.io/ios/app/chemistry-solver-ai-chemy/id6747715456)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.99 | per 7 days |
| Annual | $49.99 | per year |


### R2D2Reader

[App page](https://appshunter.io/ios/app/r2d2reader/id6763250961)

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

**In-app purchases:** none


## Frequently asked questions

### Is Chemistry Solver AI free?

Chemistry Solver AI is free to download, with in-app purchases available.

### Is R2D2Reader free?

R2D2Reader is free to download, with no in-app purchases.

### Do Chemistry Solver AI or R2D2Reader have ads?

Neither Chemistry Solver AI nor R2D2Reader shows ads.

### Which is updated more often, Chemistry Solver AI or R2D2Reader?

Chemistry Solver AI ships an update every 4 months, and R2D2Reader every 2 weeks. Most recently, Chemistry Solver AI was updated on October 2, 2026 and R2D2Reader 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.*