# Serenity Demo vs Reefability

The clearest difference is in-app purchases: Serenity Demo at none against Reefability's 9. Reefability's advantage is update cadence (daily vs every 36 months) and device support (5 vs 3). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Reefability sells 9 in-app purchases, starting at $9.99 per month. Serenity Demo asks for nothing beyond the download.

Serenity Demo ships an update every 36 months, Reefability daily. The most recent releases landed on October 27, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Serenity Demo | Reefability |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.4 (41 ratings)](https://appshunter.io/ios/app/reefability/id6636472070/reviews)** |
| Number of ratings | — | **41** |
| Positive reviews | — | 43.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 36 months | **Daily** |
| Monetization | — | Free with in-app purchases |
| Size | 20 MB | 123 MB |
| Requires iOS | 15.6 | **15.0.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple TV, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Volkan Ceylan](https://appshunter.io/developer/1661650382) | [Reefability](https://appshunter.io/developer/1762764786) |

## What reviewers say

### Serenity Demo

[App page](https://appshunter.io/ios/app/serenity-demo/id1661650380)

**Features:** macOS Compatibility

**In-app purchases:** none


### Reefability

[App page](https://appshunter.io/ios/app/reefability/id6636472070)

This app provides AI-driven management for reef aquariums, integrating chemistry, livestock, lighting, and flow data. It offers guided setup, detailed tank mapping, and personalized care suggestions to help maintain a thriving aquatic environment.

**Highlights:** AI-driven reef tank analysis, 3D reef map with PAR and flow estimation, Chemistry and nutrient logging with ICP/DOC report integration, Dosing suggestions and supplement tracking, Livestock and coral care sheets with bioload warnings, Pest identification and microbiome scoring, Sitter and expert modes for tank sharing

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1-Month | $9.99 | per month |
| Controller plan (monthly) | $11.99 | per month |
| 12-Month | $34.99 | per year |
| Controller plan (annual) | $49.99 | per year |
| Day pass | $1.99 | one-time |
| 5 tank rebuilds | $2.99 | one-time |
| Week pass | $4.99 | one-time |
| 15 tank rebuilds | $6.99 | one-time |
| Month pass | $12.99 | one-time |


## Frequently asked questions

### Is Serenity Demo free?

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

### Is Reefability free?

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

### Do Serenity Demo or Reefability have ads?

Neither Serenity Demo nor Reefability shows ads.

### Which is updated more often, Serenity Demo or Reefability?

Serenity Demo ships an update every 36 months, and Reefability daily. Most recently, Serenity Demo was updated on October 27, 2026 and Reefability on November 8, 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.*