# Reef Buddy vs Reef Stability

The clearest difference is update cadence: Reef Stability at weekly against Reef Buddy's every 2 weeks. Reef Stability also leads on iOS requirement (18.0 vs 26.0). Reef Buddy's advantage is device support (3 vs 1). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Reef Buddy sells 4 in-app purchases, starting at $0.99 per 7 days and Reef Stability sells 3 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

Reef Buddy ships an update every 2 weeks, Reef Stability weekly. The most recent releases landed on October 16, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Reef Buddy | Reef Stability |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (19 ratings)](https://appshunter.io/ios/app/reef-buddy-reef-tank-tracker/id1593580822/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Weekly** |
| Monetization | Freemium | — |
| Size | 45 MB | 9 MB |
| Requires iOS | 26.0 | **18.0** |
| Devices | **iPhone, iPad, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [maxime marinel](https://appshunter.io/developer/595076846) | [YUSUF AYDIN](https://appshunter.io/developer/6771871523) |

## What reviewers say

### Reef Buddy

[App page](https://appshunter.io/ios/app/reef-buddy-reef-tank-tracker/id1593580822)

Easily log, monitor, and analyze your saltwater aquarium's critical parameters. Get smart insights and personalized advice to maintain a healthy reef tank. Syncs across devices and offers guidance for manual test results.

**Highlights:** Log critical aquarium parameters, Monitor KH, salinity, pH, Ca, Mg, and more, Analyze data with automated insights, Sync data across iPhone and iPad, Guidance for manual test kit results, Personalized advice with premium subscription

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reef Buddy Pro Weekly | $0.99 | per 7 days |
| Reef Buddy Pro | $1.99 | per month |
| Reef buddy pro month | $3.99 | per month |
| Reef buddy pro annual | $44.99 | per year |


### 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 Reef Buddy free?

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

### Is Reef Stability free?

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

### Do Reef Buddy or Reef Stability have ads?

Neither Reef Buddy nor Reef Stability shows ads.

### Which is updated more often, Reef Buddy or Reef Stability?

Reef Buddy ships an update every 2 weeks, and Reef Stability weekly. Most recently, Reef Buddy was updated on October 16, 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.*