# FCM IoT vs DarkScreenReader

The clearest difference is in-app purchases: FCM IoT at none against DarkScreenReader's 1. FCM IoT also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, update cadence and ads there is nothing between them.

Both are free to download. DarkScreenReader sells 1 one-off in-app purchase. FCM IoT asks for nothing beyond the download.

FCM IoT ships an update every 3 weeks, DarkScreenReader every 5 weeks. The most recent releases landed on October 5, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | FCM IoT | DarkScreenReader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/darkscreenreader/id6790046139/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Monetization | — | Free |
| Size | 96 MB | 2 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [苏州曼捷科智能科技有限公司](https://appshunter.io/developer/1530505401) | [兴雨 蔡](https://appshunter.io/developer/6775318889) |

## What reviewers say

### FCM IoT

[App page](https://appshunter.io/ios/app/fcm-iot/id1584102216)

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

**In-app purchases:** none


### DarkScreenReader

[App page](https://appshunter.io/ios/app/darkscreenreader/id6790046139)

This tool allows discreet reading of local novel files by displaying text only in a small, user-defined area against a black screen. It mimics a locked phone to avoid drawing attention in public spaces. Features include customizable display, tap-to-hide functionality, and automatic page turning.

**Highlights:** Selected display area on black screen, Tap to hide/resume text, Automatic page turning, Swipe navigation, Customizable display area, Local file support

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DarkScreenReader Pro LifeTime | $1.99 | one-time |


## Frequently asked questions

### Is FCM IoT free?

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

### Is DarkScreenReader free?

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

### Do FCM IoT or DarkScreenReader have ads?

Neither FCM IoT nor DarkScreenReader shows ads.

### Which is updated more often, FCM IoT or DarkScreenReader?

FCM IoT ships an update every 3 weeks, and DarkScreenReader every 5 weeks. Most recently, FCM IoT was updated on October 5, 2026 and DarkScreenReader on September 28, 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.*