# Supernova vs Crystal Cavern Idle Mine

The clearest difference is in-app purchases: Crystal Cavern Idle Mine at none against Supernova's 10. Supernova's advantage is ads (none vs shown) and update cadence (every 2 days vs every 6 days). On price and iOS requirement there is nothing between them.

Both are free to download. Supernova sells 10 one-off in-app purchases. Crystal Cavern Idle Mine asks for nothing beyond the download.

Supernova ships an update every 2 days, Crystal Cavern Idle Mine every 6 days. The most recent releases landed on November 3, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Supernova | Crystal Cavern Idle Mine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (79 ratings)](https://appshunter.io/ios/app/supernova-idle-star-forge/id6779555607/reviews)** | — |
| Number of ratings | **79** | — |
| Positive reviews | 76.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 2 days** | Every 6 days |
| Monetization | Free with in-app purchases | — |
| Size | 15 MB | 5 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | **iPhone, iPad, Mac, Apple TV, Vision Pro** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [HUGO ANATOLE PAUL MORICEAU](https://appshunter.io/developer/1845368412) | [Yoshihiko Okano](https://appshunter.io/developer/6797871783) |

## What reviewers say

### Supernova

[App page](https://appshunter.io/ios/app/supernova-idle-star-forge/id6779555607)

An idle space tycoon game where you fuse hydrogen to grow and detonate stars. Earn permanent power-ups with each supernova to accelerate future runs. Features offline progress and a visually evolving star.

**Highlights:** Fuse hydrogen to create and grow stars, Offline progress and production, Visually evolving star stages, Prestige system with supernova cinematics, Deep multiplier stacking and research upgrades, Daily missions and streaks, Fully offline gameplay

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 50 Photons | $0.99 | one-time |
| Time Warp: 4 Hours | $1.99 | one-time |
| Break the Piggy Bank | $2.99 | one-time |
| Automation Core | $3.99 | one-time |
| Supporter Pack | $4.99 | one-time |
| Time Warp: 24 Hours | $4.99 | one-time |
| 300 Photons | $4.99 | one-time |
| 700 Photons | $9.99 | one-time |
| Time Warp: 7 Days | $14.99 | one-time |
| 1600 Photons | $19.99 | one-time |


### Crystal Cavern Idle Mine

[App page](https://appshunter.io/ios/app/crystal-cavern-idle-mine/id6814801361)

**In-app purchases:** none


## Frequently asked questions

### Is Supernova free?

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

### Is Crystal Cavern Idle Mine free?

Crystal Cavern Idle Mine is free to download, with no in-app purchases.

### Do Supernova or Crystal Cavern Idle Mine have ads?

Crystal Cavern Idle Mine shows ads; Supernova does not.

### Which is updated more often, Supernova or Crystal Cavern Idle Mine?

Supernova ships an update every 2 days, and Crystal Cavern Idle Mine every 6 days. Most recently, Supernova was updated on November 3, 2026 and Crystal Cavern Idle Mine on October 29, 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.*