# Skala Operator Mobile App vs Invoice Maker

The clearest difference is in-app purchases: Skala Operator Mobile App at none against Invoice Maker's 4. Skala Operator Mobile App also leads on update cadence (every 4 months vs every 11 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Invoice Maker sells 4 in-app purchases, starting at $2.99 per month. Skala Operator Mobile App asks for nothing beyond the download.

Skala Operator Mobile App ships an update every 4 months, Invoice Maker every 11 months. The most recent releases landed on October 27, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Skala Operator Mobile App | Invoice Maker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 11 months |
| Size | 13 MB | 40 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kemal KARAKAS](https://appshunter.io/developer/1708281507) | [UYGAR GOKCEN](https://appshunter.io/developer/1857142201) |

## What reviewers say

### Skala Operator Mobile App

[App page](https://appshunter.io/ios/app/skala-operator-mobile-app/id6467143612)

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

**In-app purchases:** none


### Invoice Maker

[App page](https://appshunter.io/ios/app/invoice-maker-speed-bill/id6755901333)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standart Plan (Aylık) | $2.99 | per month |
| Pro Plan (Aylık) | $4.99 | per month |
| Standart Plan (Yıllık) | $29.99 | per year |
| Pro Plan (Yıllık) | $49.99 | per year |


## Frequently asked questions

### Is Skala Operator Mobile App free?

Skala Operator Mobile App is free to download, with no in-app purchases.

### Is Invoice Maker free?

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

### Do Skala Operator Mobile App or Invoice Maker have ads?

Neither Skala Operator Mobile App nor Invoice Maker shows ads.

### Which is updated more often, Skala Operator Mobile App or Invoice Maker?

Skala Operator Mobile App ships an update every 4 months, and Invoice Maker every 11 months. Most recently, Skala Operator Mobile App was updated on October 27, 2026 and Invoice Maker on November 9, 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.*