# Reefability vs Sleevy

The clearest difference is in-app purchases: Sleevy at none against Reefability's 9. Reefability's advantage is update cadence (daily vs fortnightly) and device support (4 vs 2). On price and ads there is nothing between them.

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

Reefability ships an update daily, Sleevy fortnightly. The most recent releases landed on October 20, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Reefability | Sleevy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (36 ratings)](https://appshunter.io/ios/app/reefability/id6636472070/reviews)** | — |
| Number of ratings | **36** | — |
| Positive reviews | 38.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Daily** | Fortnightly |
| Monetization | Free with in-app purchases | — |
| Size | 81 MB | 8 MB |
| Requires iOS | **15.0.0** | 18.6 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Reefability](https://appshunter.io/developer/1762764786) | [Onno Klein Hofmeijer](https://appshunter.io/developer/1896760047) |

## What reviewers say

### Reefability

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

This AI-powered app offers scientific precision for managing coral reef aquariums. It analyzes microbiome health, water chemistry, and light optimization, and can identify issues from tank photos. It provides tools for hobbyists and professionals to maintain thriving reef ecosystems.

**Highlights:** AI-driven analysis of reef tank health, Smart photo diagnostics for issue identification, Evidence-based solutions and recommendations, Ecosystem stability insights, Professional tools for reef stores and professionals, Integrated parameter monitoring

**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 |


### Sleevy

[App page](https://appshunter.io/ios/app/sleevy-bookmark-manager/id6770653332)

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

**In-app purchases:** none


## Frequently asked questions

### Is Reefability free?

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

### Is Sleevy free?

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

### Do Reefability or Sleevy have ads?

Neither Reefability nor Sleevy shows ads.

### Which is updated more often, Reefability or Sleevy?

Reefability ships an update daily, and Sleevy fortnightly. Most recently, Reefability was updated on October 20, 2026 and Sleevy on October 7, 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.*