# BookGrass vs Lumi

The clearest difference is in-app purchases: BookGrass at none against Lumi's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Lumi sells 2 in-app purchases, starting at $5.99 per month. BookGrass asks for nothing beyond the download.

Both ship on a similar rhythm, roughly daily. The most recent releases landed on October 12, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | BookGrass | Lumi |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Daily | Daily |
| Size | 9 MB | 18 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Jaeyoung Heo](https://appshunter.io/developer/1833670805) | [Ivan Trajanovski](https://appshunter.io/developer/1718049049) |

## What reviewers say

### BookGrass

[App page](https://appshunter.io/ios/app/bookgrass/id6757300121)

**In-app purchases:** none


### Lumi

[App page](https://appshunter.io/ios/app/lumi-book-tracker/id6791566415)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lumi Pro Monthly | $5.99 | per month |
| Lumi Pro Yearly | $29.99 | per year |


## Frequently asked questions

### Is BookGrass free?

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

### Is Lumi free?

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

### Do BookGrass or Lumi have ads?

Neither BookGrass nor Lumi shows ads.

### Which is updated more often, BookGrass or Lumi?

BookGrass ships an update daily, and Lumi daily. Most recently, BookGrass was updated on October 12, 2026 and Lumi on October 25, 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.*