# FCFSD vs Rock Identifier

The clearest difference is in-app purchases: FCFSD at none against Rock Identifier's 2. FCFSD also leads on device support (4 vs 1) and iOS requirement (15.1 vs 17). Rock Identifier's advantage is update cadence (every 5 weeks vs every 3 months). On price and ads there is nothing between them.

Both are free to download. Rock Identifier sells 2 in-app purchases, starting at $4.99 per 7 days. FCFSD asks for nothing beyond the download.

FCFSD ships an update every 3 months, Rock Identifier every 5 weeks. The most recent releases landed on October 6, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | FCFSD | Rock Identifier |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (206 ratings)](https://appshunter.io/ios/app/rock-identifier/id6740112477/reviews)** |
| Number of ratings | — | **206** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 56 MB | 34 MB |
| Requires iOS | **15.1** | 17 |
| Devices | **iPhone, iPad, iPod, Apple TV** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Fulton Christian Fellowship](https://appshunter.io/developer/1676167118) | [Kawaii](https://appshunter.io/developer/1696001381) |

## What reviewers say

### FCFSD

[App page](https://appshunter.io/ios/app/fcfsd/id6446127718)

**Features:** Vision Pro support

**In-app purchases:** none


### Rock Identifier

[App page](https://appshunter.io/ios/app/rock-identifier/id6740112477)

Instantly identify rocks, minerals, crystals, and fossils using advanced AI. This app serves as a geological companion for enthusiasts, students, and professionals, offering detailed information and community interaction.

**Highlights:** AI-powered rock identification, Community identification sharing, Personal AI rock assistant, Learn rock categories and properties, Information on crystal systems, Geological formation details

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Rock Identifier Pro (Weekly) | $4.99 | per 7 days |
| Rock Identifier Pro (Yearly) | $29.99 | per year |


## Frequently asked questions

### Is FCFSD free?

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

### Is Rock Identifier free?

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

### Do FCFSD or Rock Identifier have ads?

Neither FCFSD nor Rock Identifier shows ads.

### Which is updated more often, FCFSD or Rock Identifier?

FCFSD ships an update every 3 months, and Rock Identifier every 5 weeks. Most recently, FCFSD was updated on October 6, 2026 and Rock Identifier on October 12, 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.*