# # Simple Invoice vs Katbix Ads

The clearest difference is in-app purchases: Katbix Ads at none against # Simple Invoice's 2. Katbix Ads also leads on update cadence (daily vs every 8 days). # Simple Invoice's advantage is ads (none vs shown) and device support (3 vs 1). On price there is nothing between them.

Both are free to download. # Simple Invoice sells 2 in-app purchases, starting at $1.99 per month. Katbix Ads asks for nothing beyond the download.

# Simple Invoice ships an update every 8 days, Katbix Ads daily. The most recent releases landed on October 7, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | # Simple Invoice | Katbix Ads |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 8 days | **Daily** |
| Size | 48 MB | 7 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [YUKI TANAIKE](https://appshunter.io/developer/478558546) | [BELAL KATBI](https://appshunter.io/developer/1649110613) |

## What reviewers say

### # Simple Invoice

[App page](https://appshunter.io/ios/app/simple-invoice/id6761528129)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Invoice Pro (Monthly) | $1.99 | per month |
| Invoice Pro (Annual) | $18.00 | per year |


### Katbix Ads

[App page](https://appshunter.io/ios/app/katbix-ads/id6764017333)

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

**In-app purchases:** none


## Frequently asked questions

### Is # Simple Invoice free?

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

### Is Katbix Ads free?

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

### Do # Simple Invoice or Katbix Ads have ads?

Katbix Ads shows ads; # Simple Invoice does not.

### Which is updated more often, # Simple Invoice or Katbix Ads?

# Simple Invoice ships an update every 8 days, and Katbix Ads daily. Most recently, # Simple Invoice was updated on October 7, 2026 and Katbix Ads on October 8, 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.*