# Invoice Rex vs FinZenFlow

The clearest difference is update cadence: FinZenFlow at every 3 days against Invoice Rex's monthly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Invoice Rex sells 2 in-app purchases, starting at $4.99 per month and FinZenFlow sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Invoice Rex ships an update monthly, FinZenFlow every 3 days. The most recent releases landed on September 30, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Invoice Rex | FinZenFlow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 days** |
| Size | 18 MB | 16 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone, iPad, Mac | **iPhone, iPad, Mac, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Charlie Monroe Software, s.r.o.](https://appshunter.io/developer/647791583) | [Francisco J. Camacho](https://appshunter.io/developer/1893566445) |

## What reviewers say

### Invoice Rex

[App page](https://appshunter.io/ios/app/invoice-rex/id6480509935)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $4.99 | per month |
| Yearly | $49.99 | per year |


### FinZenFlow

[App page](https://appshunter.io/ios/app/finzenflow/id6762256648)

**Features:** Family Sharing, Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FinZenFlow Family Premium | $3.99 | per month |
| FinZenFlow Family Premium | $39.99 | per year |


## Frequently asked questions

### Is Invoice Rex free?

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

### Is FinZenFlow free?

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

### Do Invoice Rex or FinZenFlow have ads?

Neither Invoice Rex nor FinZenFlow shows ads.

### Which is updated more often, Invoice Rex or FinZenFlow?

Invoice Rex ships an update monthly, and FinZenFlow every 3 days. Most recently, Invoice Rex was updated on September 30, 2026 and FinZenFlow on October 12, 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.*