# SmartBook Service vs WFF Inbox

The clearest difference is iOS requirement: SmartBook Service at 12.0 against WFF Inbox's 15.0. 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.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | SmartBook Service | WFF Inbox |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Size | 11 MB | 11 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ONM Systems Ltd.](https://appshunter.io/developer/953087849) | [Car Comparison LTD](https://appshunter.io/developer/1656096007) |

## What reviewers say

### SmartBook Service

[App page](https://appshunter.io/ios/app/smartbook-service/id1464190552)

**Features:** macOS Compatibility

**In-app purchases:** none


### WFF Inbox

[App page](https://appshunter.io/ios/app/wff-inbox/id6790561486)

**In-app purchases:** none


## Frequently asked questions

### Is SmartBook Service free?

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

### Is WFF Inbox free?

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

### Do SmartBook Service or WFF Inbox have ads?

Neither SmartBook Service nor WFF Inbox shows ads.

### Which is updated more often, SmartBook Service or WFF Inbox?

SmartBook Service ships an update every 3 weeks, and WFF Inbox every 3 weeks. Most recently, SmartBook Service was updated on November 3, 2026 and WFF Inbox on October 31, 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.*