# Just Invoice vs 4Spares

The clearest difference is update cadence: 4Spares at every 3 days against Just Invoice's monthly. Just Invoice's advantage is iOS requirement (12.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Just Invoice ships an update monthly, 4Spares every 3 days. The most recent releases landed on October 2, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Just Invoice | 4Spares |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 days** |
| Size | 29 MB | 74 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [WAFR CONSULTING](https://appshunter.io/developer/1526945307) | [4SPARES PRIVATE LIMITED](https://appshunter.io/developer/6780640486) |

## What reviewers say

### Just Invoice

[App page](https://appshunter.io/ios/app/just-invoice/id1601486783)

**Features:** macOS Compatibility

**In-app purchases:** none


### 4Spares

[App page](https://appshunter.io/ios/app/4sparesinventory/id6780988607)

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

**In-app purchases:** none


## Frequently asked questions

### Is Just Invoice free?

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

### Is 4Spares free?

4Spares is free to download, with no in-app purchases.

### Do Just Invoice or 4Spares have ads?

Neither Just Invoice nor 4Spares shows ads.

### Which is updated more often, Just Invoice or 4Spares?

Just Invoice ships an update monthly, and 4Spares every 3 days. Most recently, Just Invoice was updated on October 2, 2026 and 4Spares on September 25, 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.*