# Calcul Mental Challenge vs StellarVana

The clearest difference is in-app purchases: Calcul Mental Challenge at none against StellarVana's 2. Calcul Mental Challenge also leads on update cadence (every 4 days vs fortnightly) and iOS requirement (15.6 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. StellarVana sells 2 in-app purchases, starting at $4.99 per month. Calcul Mental Challenge asks for nothing beyond the download.

Calcul Mental Challenge ships an update every 4 days, StellarVana fortnightly. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Calcul Mental Challenge | StellarVana |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/stellarvana-star-map/id6808117808/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Fortnightly |
| Monetization | — | Free with in-app purchases |
| Size | 196 MB | 13 MB |
| Requires iOS | **15.6** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Laurent BOST](https://appshunter.io/developer/1891585206) | [Gary Saggu](https://appshunter.io/developer/465733546) |

## What reviewers say

### Calcul Mental Challenge

[App page](https://appshunter.io/ios/app/calcul-mental-challenge/id6761807166)

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

**In-app purchases:** none


### StellarVana

[App page](https://appshunter.io/ios/app/stellarvana-star-map/id6808117808)

Explore the night sky with a dynamic celestial map. Identify stars, planets, and constellations in real-time. Plan observations and learn about astronomical events like eclipses.

**Highlights:** Live sky map identification, Constellation and object search, Eclipse countdowns and visibility, Tonight's observation planner, Educational astronomy topics, Night-vision red mode

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| StellarVana Premium monthly | $4.99 | per month |
| StellarVana Premium Annual | $39.99 | per year |


## Frequently asked questions

### Is Calcul Mental Challenge free?

Calcul Mental Challenge is free to download, with no in-app purchases.

### Is StellarVana free?

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

### Do Calcul Mental Challenge or StellarVana have ads?

Neither Calcul Mental Challenge nor StellarVana shows ads.

### Which is updated more often, Calcul Mental Challenge or StellarVana?

Calcul Mental Challenge ships an update every 4 days, and StellarVana fortnightly. Most recently, Calcul Mental Challenge was updated on October 25, 2026 and StellarVana on October 31, 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.*