# PetroFI vs StoneBook

The clearest difference is device support: PetroFI at 3 against StoneBook's 1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PetroFI ships an update every 3 days, StoneBook every 4 days. The most recent releases landed on September 18, 2026 and August 28, 2026 respectively.

## The numbers

| Metric | PetroFI | StoneBook |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 4 days |
| Size | 44 MB | 96 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Anurag Srivastava](https://appshunter.io/developer/1874649245) | [Krishna Chatanya Idamakanti](https://appshunter.io/developer/1884830600) |

## What reviewers say

### PetroFI

[App page](https://appshunter.io/ios/app/petrofi/id6758732447)

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

**In-app purchases:** none


### StoneBook

[App page](https://appshunter.io/ios/app/stonebook/id6760532532)

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

**In-app purchases:** none


## Frequently asked questions

### Is PetroFI free?

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

### Is StoneBook free?

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

### Do PetroFI or StoneBook have ads?

Neither PetroFI nor StoneBook shows ads.

### Which is updated more often, PetroFI or StoneBook?

PetroFI ships an update every 3 days, and StoneBook every 4 days. Most recently, PetroFI was updated on September 18, 2026 and StoneBook on August 28, 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.*