# Visible Knowledge vs Oppi

The clearest difference is in-app purchases: Visible Knowledge at none against Oppi's 2. Visible Knowledge also leads on iOS requirement (12.4 vs 17.0). Oppi's advantage is device support. On price there is nothing between them.

Both are free to download. Oppi sells 2 in-app purchases, starting at $4.99 per month. Visible Knowledge asks for nothing beyond the download.

## The numbers

| Metric | Visible Knowledge | Oppi |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Update frequency | — | Every 5 days |
| Size | 21 MB | 93 MB |
| Requires iOS | **12.4** | 17.0 |
| Devices | — | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Visible care Sweden AB](https://appshunter.io/developer/1485727328) | [Middle Milk Studio AB](https://appshunter.io/developer/1734689386) |

## What reviewers say

### Visible Knowledge

[App page](https://appshunter.io/ios/app/visible-knowledge/id1629871489)

**In-app purchases:** none


### Oppi

[App page](https://appshunter.io/ios/app/oppi-homework-without-nagging/id6478979252)

**Features:** Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Oppi+ Månadsvis | $4.99 | per month |
| Oppi+ Årlig | $39.99 | per year |


## Frequently asked questions

### Is Visible Knowledge free?

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

### Is Oppi free?

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

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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.*