# Grow Sensor vs DrainMaster Plus

The clearest difference is in-app purchases: Grow Sensor at none against DrainMaster Plus's 5. Grow Sensor also leads on iOS requirement (14.0 vs 16.4). DrainMaster Plus's advantage is update cadence (every 2 weeks vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. DrainMaster Plus sells 5 in-app purchases, starting at $3.99 per month. Grow Sensor asks for nothing beyond the download.

Grow Sensor ships an update every 2 months, DrainMaster Plus every 2 weeks. The most recent releases landed on October 19, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Grow Sensor | DrainMaster Plus |
| --- | --- | --- |
| 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 | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 72 MB | 82 MB |
| Requires iOS | **14.0** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Grow Sensor LTD](https://appshunter.io/developer/1718380665) | [kobosil.me Development](https://appshunter.io/developer/951054288) |

## 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


### DrainMaster Plus

[App page](https://appshunter.io/ios/app/drainmaster-plus-ec-and-ph/id6752567739)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DrainMaster Cloud Monthly | $3.99 | per month |
| 50 Credits | $1.99 | one-time |
| 150 Coins | $3.99 | one-time |
| 400 Coins | $8.99 | one-time |
| 1000 Coins | $17.99 | one-time |


## Frequently asked questions

### Is Grow Sensor free?

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

### Is DrainMaster Plus free?

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

### Do Grow Sensor or DrainMaster Plus have ads?

Neither Grow Sensor nor DrainMaster Plus shows ads.

### Which is updated more often, Grow Sensor or DrainMaster Plus?

Grow Sensor ships an update every 2 months, and DrainMaster Plus every 2 weeks. Most recently, Grow Sensor was updated on October 19, 2026 and DrainMaster Plus on October 30, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*