# Time to Invoice vs Hourbook

The clearest difference is update cadence: Hourbook at every 4 days against Time to Invoice's every 10 months. Hourbook also leads on iOS requirement (17.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Time to Invoice sells 1 one-off in-app purchase and Hourbook sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Time to Invoice ships an update every 10 months, Hourbook every 4 days. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Time to Invoice | Hourbook |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 4 days** |
| Size | 2 MB | 22 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Apptown Studio AB](https://appshunter.io/developer/330530757) | [EERO OSSINPOIKA JUNKKARI](https://appshunter.io/developer/1896768941) |

## What reviewers say

### Time to Invoice

[App page](https://appshunter.io/ios/app/time-to-invoice/id999295530)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $49.99 | one-time |


### Hourbook

[App page](https://appshunter.io/ios/app/hourbook-work-hours-tracker/id6771013197)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hourbook Pro | $1.99 | per month |
| Hourbook Pro | $17.99 | per year |


## Frequently asked questions

### Is Time to Invoice free?

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

### Is Hourbook free?

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

### Do Time to Invoice or Hourbook have ads?

Neither Time to Invoice nor Hourbook shows ads.

### Which is updated more often, Time to Invoice or Hourbook?

Time to Invoice ships an update every 10 months, and Hourbook every 4 days. Most recently, Time to Invoice was updated on November 1, 2026 and Hourbook 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.*