# JBJ Aquarium vs Md Preview

The clearest difference is review sentiment: Md Preview at 71% against JBJ Aquarium's 9%. Md Preview also leads on rating (4.4 vs 1.6) and update cadence (every 3 days vs every 16 months). JBJ Aquarium's advantage is price (Free vs $1.99) and ratings volume (18 vs 5). On ads, in-app purchases and device support there is nothing between them.

JBJ Aquarium is free to download; Md Preview costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Md Preview holds the better App Store score, 4.4 against 1.6. Both are backed by a comparable volume of ratings — 18 and 5 respectively. Written reviews point the same way: 9% of JBJ Aquarium's written reviews are positive against 71% of Md Preview's.

JBJ Aquarium ships an update every 16 months, Md Preview every 3 days. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | JBJ Aquarium | Md Preview |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [1.6 (18 ratings)](https://appshunter.io/ios/app/jbj-aquarium/id1133481338/reviews) | **[4.4 (5 ratings)](https://appshunter.io/ios/app/md-preview-markdown-viewer/id6760341080/reviews)** |
| Number of ratings | **18** | 5 |
| Positive reviews | 9.1% of reviews | **71.4% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 3 days** |
| Monetization | **Free** | Paid |
| Size | 29 MB | 4 MB |
| Requires iOS | **7.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Guangdong Boyu Group Co.,Ltd.](https://appshunter.io/developer/1140425787) | [CyberGame Limited](https://appshunter.io/developer/1778824442) |

## What reviewers say

### JBJ Aquarium

[App page](https://appshunter.io/ios/app/jbj-aquarium/id1133481338)

This app allows for smart control of aquariums via WiFi, managing lighting, and other functions. It offers single and multiple device control, with manual and automated settings for a personalized aquatic environment.

**Highlights:** WiFi aquarium control, Manage lighting and status, Single and multiple device control, Manual and automated settings, Personalized environment control, Real-time operation and preview

**Features:** macOS Compatibility

**In-app purchases:** none


### Md Preview

[App page](https://appshunter.io/ios/app/md-preview-markdown-viewer/id6760341080)

View your Markdown files with exceptional clarity on iPhone and iPad. Supports all Markdown features, code syntax highlighting, LaTeX math, and Mermaid diagrams. Renders files offline and integrates with other apps.

**Highlights:** Full GFM support (tables, task lists, footnotes), Syntax highlighting for 40+ programming languages, LaTeX math rendering with KaTeX, Mermaid diagram support, Offline rendering on-device, System file handler for .md files, Dark mode with automatic theme switching

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

**In-app purchases:** none


## Frequently asked questions

### Is JBJ Aquarium free?

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

### Is Md Preview free?

Md Preview costs $1.99, with no in-app purchases.

### Which has better reviews, JBJ Aquarium or Md Preview?

Md Preview is rated higher. JBJ Aquarium averages 1.6 out of 5 from 18 ratings, while Md Preview averages 4.4 from 5 ratings.

### Do JBJ Aquarium or Md Preview have ads?

Neither JBJ Aquarium nor Md Preview shows ads.

### Which is updated more often, JBJ Aquarium or Md Preview?

JBJ Aquarium ships an update every 16 months, and Md Preview every 3 days. Most recently, JBJ Aquarium was updated on November 2, 2026 and Md Preview on November 5, 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.*