# Reef Buddy vs MD118

The clearest difference is in-app purchases: MD118 at none against Reef Buddy's 4. MD118 also leads on update cadence (weekly vs fortnightly) and iOS requirement (13.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Reef Buddy sells 4 in-app purchases, starting at $0.99 per 7 days. MD118 asks for nothing beyond the download.

Reef Buddy ships an update fortnightly, MD118 weekly. The most recent releases landed on November 3, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Reef Buddy | MD118 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (20 ratings)](https://appshunter.io/ios/app/reef-buddy-reef-tank-tracker/id1593580822/reviews)** | — |
| Number of ratings | **20** | — |
| Positive reviews | 54.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | Freemium | — |
| Size | 46 MB | 1 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [maxime marinel](https://appshunter.io/developer/595076846) | [Iroshini Dissanayake](https://appshunter.io/developer/1771382882) |

## 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 |


### MD118

[App page](https://appshunter.io/ios/app/md118/id6733230024)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Reef Buddy free?

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

### Is MD118 free?

MD118 is free to download, with no in-app purchases.

### Do Reef Buddy or MD118 have ads?

Neither Reef Buddy nor MD118 shows ads.

### Which is updated more often, Reef Buddy or MD118?

Reef Buddy ships an update fortnightly, and MD118 weekly. Most recently, Reef Buddy was updated on November 3, 2026 and MD118 on October 17, 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.*