# Hanna Lab vs Reef Stability

The clearest difference is in-app purchases: Hanna Lab at none against Reef Stability's 3. Hanna Lab also leads on device support (3 vs 1) and iOS requirement (15.0 vs 18.0). Reef Stability's advantage is update cadence (weekly vs every 5 months). On price and ads there is nothing between them.

Both are free to download. Reef Stability sells 3 in-app purchases, starting at $6.99 per month. Hanna Lab asks for nothing beyond the download.

Hanna Lab ships an update every 5 months, Reef Stability weekly. The most recent releases landed on September 25, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Hanna Lab | Reef Stability |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (10 ratings)](https://appshunter.io/ios/app/hanna-lab/id913755813/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 45.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Weekly** |
| Monetization | Free | — |
| Size | 32 MB | 9 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hanna Instruments, Inc.](https://appshunter.io/developer/913755816) | [YUSUF AYDIN](https://appshunter.io/developer/6771871523) |

## What reviewers say

### Hanna Lab

[App page](https://appshunter.io/ios/app/hanna-lab/id913755813)

Transform your mobile device into a professional-grade pH meter or data management system. Connect with compatible Hanna Instruments probes and meters to conduct precise measurements, store data securely, and access it via the cloud.

**Highlights:** pH meter functionality with Bluetooth probes, Data management with compatible meters, Hanna Cloud compatibility for data sync, Live measurements and trend graphs, Data export in PDF and CSV formats, Calibration and logging features

**Features:** macOS Compatibility

**In-app purchases:** none


### Reef Stability

[App page](https://appshunter.io/ios/app/reef-stability-dosing-tracker/id6799461220)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $6.99 | per month |
| Premium Annual | $39.99 | per year |
| Premium Lifetime | $89.99 | one-time |


## Frequently asked questions

### Is Hanna Lab free?

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

### Is Reef Stability free?

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

### Do Hanna Lab or Reef Stability have ads?

Neither Hanna Lab nor Reef Stability shows ads.

### Which is updated more often, Hanna Lab or Reef Stability?

Hanna Lab ships an update every 5 months, and Reef Stability weekly. Most recently, Hanna Lab was updated on September 25, 2026 and Reef Stability on October 11, 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.*