# Optim System app vs TauTasPay

The clearest difference is ads: Optim System app at none against TauTasPay's shown. Optim System app also leads on iOS requirement (15.1 vs 17.0). On price, 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.

## The numbers

| Metric | Optim System app | TauTasPay |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 9 days | — |
| Size | 44 MB | 184 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Optim Systems, Ltd.](https://appshunter.io/developer/1713704866) | [Emerald24](https://appshunter.io/developer/1504671878) |

## What reviewers say

### Optim System app

[App page](https://appshunter.io/ios/app/optim-system-app-weopsy/id6470450913)

**Features:** macOS Compatibility

**In-app purchases:** none


### TauTasPay

[App page](https://appshunter.io/ios/app/tautaspay/id6751705150)

**In-app purchases:** none


## Frequently asked questions

### Is Optim System app free?

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

### Is TauTasPay free?

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

### Do Optim System app or TauTasPay have ads?

TauTasPay shows ads; Optim System app does not.

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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.*