# Mammoth AI vs Deepen

The clearest difference is review sentiment: Deepen at 100% against Mammoth AI's 0%. Deepen also leads on rating (5.0 vs 4.4) and update cadence (every 5 days vs every 3 weeks). Mammoth AI's advantage is ratings volume (17 vs 1) and iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Mammoth AI sells 3 in-app purchases, starting at $4.99 per 7 days and Deepen sells 3 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Deepen 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. Written reviews point the same way: 0% of Mammoth AI's written reviews are positive against 100% of Deepen's.

Mammoth AI ships an update every 3 weeks, Deepen every 5 days. Both last shipped on November 5, 2026.

## The numbers

| Metric | Mammoth AI | Deepen |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (17 ratings)](https://appshunter.io/ios/app/mammoth-ai-chatbot-assistant/id6777931840/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/deepen-book-notes-by-voice/id6780666477/reviews)** |
| Number of ratings | **17** | 1 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 96 MB | 17 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [Marut Kumar](https://appshunter.io/developer/1890094471) | [Francois Sempe](https://appshunter.io/developer/1887391018) |

## What reviewers say

### 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 |


### Deepen

[App page](https://appshunter.io/ios/app/deepen-book-notes-by-voice/id6780666477)

Transform passive reading into active learning by speaking your thoughts aloud. This app creates a personal knowledge map from your spoken insights, connecting ideas across all the books you read. It helps you remember what you've learned and query your own reading history.

**Highlights:** Log pages read and track progress, Answer spoken questions about content, Generate concept maps from spoken answers, Connect ideas across multiple books, Query your personal reading library, Save lookup words and memorable passages, Import Goodreads shelves

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly | $6.99 | per 7 days |
| Pro Annual | $49.99 | per year |
| Pro Annual | $79.99 | per year |


## Frequently asked questions

### Is Mammoth AI free?

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

### Is Deepen free?

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

### Which has better reviews, Mammoth AI or Deepen?

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

### Do Mammoth AI or Deepen have ads?

Neither Mammoth AI nor Deepen shows ads.

### Which is updated more often, Mammoth AI or Deepen?

Mammoth AI ships an update every 3 weeks, and Deepen every 5 days. Most recently, Mammoth AI was updated on November 5, 2026 and Deepen 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.*