# Lucid vs Mettis Instructor

The clearest difference is update cadence: Mettis Instructor at weekly against Lucid's fortnightly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Lucid ships an update fortnightly, Mettis Instructor weekly. The most recent releases landed on September 24, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Lucid | Mettis Instructor |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 86.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | Free | — |
| Size | 127 MB | 31 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Lucarne Pro](https://appshunter.io/developer/1868101039) | [Mettis AI](https://appshunter.io/developer/1854102469) |

## What reviewers say

### Lucid

[App page](https://appshunter.io/ios/app/lucid/id6757653389)

This app transforms school tracking into an engaging experience with gamified progress, AI-powered quizzes, and personalized revision plans. Its modern interface and focus on user privacy make learning enjoyable and accessible, even offline.

**Highlights:** Gamified progress tracking with XP and levels, AI-powered personalized quizzes, Customizable modern interface, Offline revision plans, Total data privacy and encryption

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

**In-app purchases:** none


### Mettis Instructor

[App page](https://appshunter.io/ios/app/mettis-instructor/id6759099435)

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

**In-app purchases:** none


## Frequently asked questions

### Is Lucid free?

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

### Is Mettis Instructor free?

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

### Do Lucid or Mettis Instructor have ads?

Neither Lucid nor Mettis Instructor shows ads.

### Which is updated more often, Lucid or Mettis Instructor?

Lucid ships an update fortnightly, and Mettis Instructor weekly. Most recently, Lucid was updated on September 24, 2026 and Mettis Instructor on September 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.*