# BookGrass vs SmartPet

The clearest difference is in-app purchases: BookGrass at none against SmartPet's 2. BookGrass also leads on ads (none vs shown) and update cadence (daily vs every 3 weeks). SmartPet's advantage is iOS requirement (15.0 vs 17.6). On price and device support there is nothing between them.

Both are free to download. SmartPet sells 2 in-app purchases, starting at $10.99 per month. BookGrass asks for nothing beyond the download.

BookGrass ships an update daily, SmartPet every 3 weeks. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | BookGrass | SmartPet |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Daily** | Every 3 weeks |
| Size | 9 MB | 81 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jaeyoung Heo](https://appshunter.io/developer/1833670805) | [Odin Solutions Lda](https://appshunter.io/developer/1878421565) |

## What reviewers say

### BookGrass

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

**In-app purchases:** none


### SmartPet

[App page](https://appshunter.io/ios/app/smartpet-bite-sized-books/id6766229269)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription Package | $10.99 | per month |
| Yearly Subscription Package | $89.99 | per year |


## Frequently asked questions

### Is BookGrass free?

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

### Is SmartPet free?

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

### Do BookGrass or SmartPet have ads?

SmartPet shows ads; BookGrass does not.

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

BookGrass ships an update daily, and SmartPet every 3 weeks. Most recently, BookGrass was updated on October 28, 2026 and SmartPet on October 25, 2026.

---

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