# Constellation Diary vs Mammoth AI

The clearest difference is rating: Constellation Diary at 5.0 against Mammoth AI's 4.4. Constellation Diary also leads on in-app purchases (none vs 3). Mammoth AI's advantage is ratings volume (17 vs 1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Mammoth AI sells 3 in-app purchases, starting at $4.99 per 7 days. Constellation Diary asks for nothing beyond the download.

Constellation Diary holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Mammoth AI has 17 ratings behind it against 1, so its average is the more settled of the two.

Constellation Diary ships an update monthly, Mammoth AI every 3 weeks. The most recent releases landed on October 22, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Constellation Diary | Mammoth AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/constellation-diary/id6758516652/reviews)** | [4.4 (17 ratings)](https://appshunter.io/ios/app/mammoth-ai-chatbot-assistant/id6777931840/reviews) |
| Number of ratings | 1 | **17** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 48 MB | 96 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Michael Sproul](https://appshunter.io/developer/1863910911) | [Marut Kumar](https://appshunter.io/developer/1890094471) |

## What reviewers say

### Constellation Diary

[App page](https://appshunter.io/ios/app/constellation-diary/id6758516652)

Record your daily emotions and assign them colors to visualize your feelings. Build a personalized solar system where each celestial body represents an entry, creating a unique visual diary of your inner world.

**Highlights:** Emotional journaling, Color association for feelings, Personalized solar system creation, Visual diary of emotions, Daily entry logging

**Features:** macOS Compatibility

**In-app purchases:** none


### Mammoth AI

[App page](https://appshunter.io/ios/app/mammoth-ai-chatbot-assistant/id6777931840)

This AI assistant builds a persistent memory vault from your shared information, learning and improving its skills over time. It integrates with your messaging platforms to take action and offers customizable autonomy levels for task management. Your data remains on your own infrastructure.

**Highlights:** Persistent memory vault, Self-improving skills, Messaging platform integration, Customizable autonomy levels, Runs on your own infrastructure, Open source

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hermes AI Subscription | $4.99 | per 7 days |
| Hermes AI Weekly Subscription | $9.99 | per 7 days |
| Hermes AI Yearly Subscription | $39.99 | per year |


## Frequently asked questions

### Is Constellation Diary free?

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

### Is Mammoth AI free?

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

### Which has better reviews, Constellation Diary or Mammoth AI?

Constellation Diary is rated higher. Constellation Diary averages 5.0 out of 5 from 1 ratings, while Mammoth AI averages 4.4 from 17 ratings.

### Do Constellation Diary or Mammoth AI have ads?

Neither Constellation Diary nor Mammoth AI shows ads.

### Which is updated more often, Constellation Diary or Mammoth AI?

Constellation Diary ships an update monthly, and Mammoth AI every 3 weeks. Most recently, Constellation Diary was updated on October 22, 2026 and Mammoth AI on October 25, 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.*