# Tijdgraver vs Sunja

The clearest difference is in-app purchases: Tijdgraver at none against Sunja's 2. Tijdgraver also leads on iOS requirement (15.0 vs 17.6). Sunja's advantage is device support. On price and update cadence there is nothing between them.

Both are free to download. Sunja sells 2 in-app purchases, starting at $29.99 per month. Tijdgraver asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 5 months. The most recent releases landed on October 17, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Tijdgraver | Sunja |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | Yes |
| Update frequency | Every 5 months | Every 5 months |
| Size | 155 MB | 70 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | — | **iPhone, iPad** |
| Age rating | 17+ | 4+ |
| Developer | [Eduvolutionx B.V](https://appshunter.io/developer/1761047254) | [Sunja Labs Private Limited](https://appshunter.io/developer/1774734869) |

## What reviewers say

### Tijdgraver

[App page](https://appshunter.io/ios/app/tijdgraver/id6474678365)

**In-app purchases:** none


### Sunja

[App page](https://appshunter.io/ios/app/sunja-interactive-3d-science/id6760365462)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Learning | $29.99 | per month |
| Annual Learning | $199.99 | per year |


## Frequently asked questions

### Is Tijdgraver free?

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

### Is Sunja free?

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

### Which is updated more often, Tijdgraver or Sunja?

Tijdgraver ships an update every 5 months, and Sunja every 5 months. Most recently, Tijdgraver was updated on October 17, 2026 and Sunja on October 7, 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.*