# Grow Sensor vs Rex Roulette Predictor

The clearest difference is in-app purchases: Grow Sensor at none against Rex Roulette Predictor's 1. Rex Roulette Predictor's advantage is update cadence (daily vs every 2 months) and iOS requirement (12.0 vs 14.0). On price, ads and device support there is nothing between them.

Both are free to download. Rex Roulette Predictor sells 1 in-app purchase, starting at $15.00 per month. Grow Sensor asks for nothing beyond the download.

Grow Sensor ships an update every 2 months, Rex Roulette Predictor daily. Both last shipped on November 4, 2026.

## The numbers

| Metric | Grow Sensor | Rex Roulette Predictor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/grow-sensor-read-the-room/id6473087688/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Daily** |
| Monetization | Free | — |
| Size | 72 MB | 32 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Grow Sensor LTD](https://appshunter.io/developer/1718380665) | [ismail kirmizigul](https://appshunter.io/developer/1760187460) |

## What reviewers say

### Grow Sensor

[App page](https://appshunter.io/ios/app/grow-sensor-read-the-room/id6473087688)

This app monitors environmental conditions in grow rooms, including temperature, humidity, CO₂, and light levels. It provides real-time data and detailed graphs to help optimize plant growth. Alerts keep users informed about their environment.

**Highlights:** Real-time environmental monitoring, Temperature and humidity tracking, CO₂, PAR, and pressure readings, VPD calculation, Detailed graphs and insights, Customizable alerts

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

**In-app purchases:** none


### Rex Roulette Predictor

[App page](https://appshunter.io/ios/app/rex-roulette-predictor/id6612039110)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Rex Roulette Predictor Pro | $15.00 | per month |


## Frequently asked questions

### Is Grow Sensor free?

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

### Is Rex Roulette Predictor free?

Rex Roulette Predictor is free to download, with in-app purchases available.

### Do Grow Sensor or Rex Roulette Predictor have ads?

Neither Grow Sensor nor Rex Roulette Predictor shows ads.

### Which is updated more often, Grow Sensor or Rex Roulette Predictor?

Grow Sensor ships an update every 2 months, and Rex Roulette Predictor daily. Most recently, Grow Sensor was updated on November 4, 2026 and Rex Roulette Predictor on November 4, 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.*