# Optimum Line vs FairInvoice

The clearest difference is in-app purchases: Optimum Line at none against FairInvoice's 3. Optimum Line also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. FairInvoice sells 3 in-app purchases, starting at $2.99 per month. Optimum Line asks for nothing beyond the download.

Optimum Line ships an update fortnightly, FairInvoice every 2 weeks. Both last shipped on November 5, 2026.

## The numbers

| Metric | Optimum Line | FairInvoice |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 weeks |
| Size | 23 MB | 19 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Exera Ltd](https://appshunter.io/developer/1458450388) | [Moaath Othman](https://appshunter.io/developer/866641649) |

## What reviewers say

### Optimum Line

[App page](https://appshunter.io/ios/app/optimum-line/id6757951052)

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

**In-app purchases:** none


### FairInvoice

[App page](https://appshunter.io/ios/app/fairinvoice-invoice-maker/id6789216704)

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Yearly | $19.99 | per year |
| FairInvoice Pro Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is Optimum Line free?

Optimum Line is free to download, with no in-app purchases.

### Is FairInvoice free?

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

### Do Optimum Line or FairInvoice have ads?

Neither Optimum Line nor FairInvoice shows ads.

### Which is updated more often, Optimum Line or FairInvoice?

Optimum Line ships an update fortnightly, and FairInvoice every 2 weeks. Most recently, Optimum Line was updated on November 5, 2026 and FairInvoice on November 5, 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.*