# Reef Buddy vs Senrium

The clearest difference is ads: Reef Buddy at none against Senrium's shown. Reef Buddy also leads on update cadence (every 2 weeks vs every 6 weeks). Senrium's advantage is iOS requirement (15.6 vs 26.0). On price, in-app purchases 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 and Senrium sells 3 in-app purchases, starting at $2.49 per month. Whichever you choose, the download price is not the number that matters.

Reef Buddy ships an update every 2 weeks, Senrium every 6 weeks. The most recent releases landed on September 20, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Reef Buddy | Senrium |
| --- | --- | --- |
| 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** | Yes |
| Update frequency | **Every 2 weeks** | Every 6 weeks |
| Monetization | Freemium | — |
| Size | 44 MB | 64 MB |
| Requires iOS | 26.0 | **15.6** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [maxime marinel](https://appshunter.io/developer/595076846) | [Samuel Steele](https://appshunter.io/developer/1708640965) |

## 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 |


### Senrium

[App page](https://appshunter.io/ios/app/senrium/id6467432068)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Single Aquarium (Monthly) | $2.49 | per month |
| Mutli (Monthly) | $3.99 | per month |
| +Pro (Monthly) | $14.99 | per month |


## Frequently asked questions

### Is Reef Buddy free?

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

### Is Senrium free?

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

### Do Reef Buddy or Senrium have ads?

Senrium shows ads; Reef Buddy does not.

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

Reef Buddy ships an update every 2 weeks, and Senrium every 6 weeks. Most recently, Reef Buddy was updated on September 20, 2026 and Senrium on September 16, 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.*