# MemDay vs Crystal ID

The clearest difference is rating: MemDay at 5.0 against Crystal ID's 3.5. MemDay also leads on monetization model (free vs free with in-app purchases). Crystal ID's advantage is update cadence (every 8 days vs every 21 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. MemDay sells 1 one-off in-app purchase and Crystal ID sells 4 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

MemDay holds the better App Store score, 5.0 against 3.5. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

MemDay ships an update every 21 months, Crystal ID every 8 days. The most recent releases landed on November 3, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | MemDay | Crystal ID |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/memday/id6447469527/reviews)** | [3.5 (2 ratings)](https://appshunter.io/ios/app/crystal-id-ai-gem-scanner/id6743992156/reviews) |
| Number of ratings | 1 | **2** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 8 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 12 MB | 65 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [shaojun lin](https://appshunter.io/developer/1263579053) | [Simpel Nem IT](https://appshunter.io/developer/1084831792) |

## What reviewers say

### MemDay

[App page](https://appshunter.io/ios/app/memday/id6447469527)

This app helps you plan and record your daily life, acting as a digital journal and study aid. It offers features like OCR, translation, and mapping to enhance memory and organization. Receive daily reminders and review your progress with quizzes.

**Highlights:** Daily planning and recording, Integrated OCR and translation, Event and reminder notifications, Text-to-speech for memory enhancement, Daily quizzes and progress reports, Photo and drawing uploads, Powerful search functionality

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| memDayPro | $3.99 | one-time |


### Crystal ID

[App page](https://appshunter.io/ios/app/crystal-id-ai-gem-scanner/id6743992156)

Instantly identify crystals and gemstones using AI by snapping a photo. Explore detailed profiles, meanings, and energy properties. Build a personal collection of your identified stones and discover their connections to zodiac signs and chakras.

**Highlights:** AI-powered crystal identification, Detailed gemstone profiles, Crystal encyclopedia, Zodiac and chakra connections, Personal collection tracking, Instant photo recognition

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $2.99 | per 7 days |
| Monthly Premium | $5.99 | per month |
| Yearly Premium | $24.99 | per year |
| Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is MemDay free?

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

### Is Crystal ID free?

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

### Which has better reviews, MemDay or Crystal ID?

MemDay is rated higher. MemDay averages 5.0 out of 5 from 1 ratings, while Crystal ID averages 3.5 from 2 ratings.

### Do MemDay or Crystal ID have ads?

Neither MemDay nor Crystal ID shows ads.

### Which is updated more often, MemDay or Crystal ID?

MemDay ships an update every 21 months, and Crystal ID every 8 days. Most recently, MemDay was updated on November 3, 2026 and Crystal ID 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.*