# OpsBack vs Simple Invoice PDF

The clearest difference is in-app purchases: OpsBack at none against Simple Invoice PDF's 1. OpsBack also leads on update cadence (every 5 days vs fortnightly) and iOS requirement (15.1 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. Simple Invoice PDF sells 1 one-off in-app purchase. OpsBack asks for nothing beyond the download.

OpsBack ships an update every 5 days, Simple Invoice PDF fortnightly. The most recent releases landed on September 17, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | OpsBack | Simple Invoice PDF |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Fortnightly |
| Size | 68 MB | 2 MB |
| Requires iOS | **15.1** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Tribute Path](https://appshunter.io/developer/1803045839) | [Serghei Eschin](https://appshunter.io/developer/6774241012) |

## What reviewers say

### OpsBack

[App page](https://appshunter.io/ios/app/opsback/id6764493810)

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

**In-app purchases:** none


### Simple Invoice PDF

[App page](https://appshunter.io/ios/app/simple-invoice-pdf/id6788337612)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Simple Invoice Pro | $9.99 | one-time |


## Frequently asked questions

### Is OpsBack free?

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

### Is Simple Invoice PDF free?

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

### Do OpsBack or Simple Invoice PDF have ads?

Neither OpsBack nor Simple Invoice PDF shows ads.

### Which is updated more often, OpsBack or Simple Invoice PDF?

OpsBack ships an update every 5 days, and Simple Invoice PDF fortnightly. Most recently, OpsBack was updated on September 17, 2026 and Simple Invoice PDF on September 19, 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.*