# OptiSurface Mobile vs Invoice Maker ₊

The clearest difference is update cadence: OptiSurface Mobile at every 8 days against Invoice Maker ₊'s every 6 weeks. OptiSurface Mobile also leads on device support (3 vs 1) and iOS requirement (9.0 vs 17.6). On price, 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.

OptiSurface Mobile ships an update every 8 days, Invoice Maker ₊ every 6 weeks. The most recent releases landed on September 28, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | OptiSurface Mobile | Invoice Maker ₊ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 6 weeks |
| Size | 27 MB | 25 MB |
| Requires iOS | **9.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Graeme Cox](https://appshunter.io/developer/1437126862) | [HabbitHub](https://appshunter.io/developer/1701559105) |

## What reviewers say

### OptiSurface Mobile

[App page](https://appshunter.io/ios/app/optisurface-mobile/id1472505397)

**Features:** macOS Compatibility

**In-app purchases:** none


### Invoice Maker ₊

[App page](https://appshunter.io/ios/app/invoice-maker/id6470811583)

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

**In-app purchases:** none


## Frequently asked questions

### Is OptiSurface Mobile free?

OptiSurface Mobile is free to download, with no in-app purchases.

### Is Invoice Maker ₊ free?

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

### Do OptiSurface Mobile or Invoice Maker ₊ have ads?

Neither OptiSurface Mobile nor Invoice Maker ₊ shows ads.

### Which is updated more often, OptiSurface Mobile or Invoice Maker ₊?

OptiSurface Mobile ships an update every 8 days, and Invoice Maker ₊ every 6 weeks. Most recently, OptiSurface Mobile was updated on September 28, 2026 and Invoice Maker ₊ on October 4, 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.*