Comparison

Mammoth AI vs Deepen

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Mammoth AI

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
Read full description

Stop juggling subscriptions. Mammoth gives you instant access to the world's best AI models - all in one clean, simple app. Don't go extinct. Stay at the top of AI. New models launch every week, and picking the "best" one is a full-time job. Mammouth solves that: one subscription, every leading model, always up to date. ACCESS ALL THE TOP AI MODELS Chat and create with the models everyone's talking about. FEATURES BUILT FOR REAL WORKFLOWS One-click reprompting - send your prompt to another model instantly and compare answers Mammoth Projects - organize your work by topic Upload images and files for the AI to analyze Voice chat for hands-free conversations AI-powered web search for up-to-date answers Switch models anytime, mid-conversation Sync seamlessly across all your devices YOUR DATA STAYS YOURS Fully GDPR compliant Your content is never used to train AI models Our providers don't retain your prompts, no history stored on their end Delete your history anytime, right from your account settings Join thousands of professionals, creators, and curious minds who use Mammoth every day to stay ahead in the fast-moving world of AI. Download Mammoth today and never fall behind again. Privacy Policy:https://sites.google.com/view/mammouthprivacy/home Terms of Use: https://sites.google.com/view/mammouthterms/home

About

Deepen

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
Read full description

You finish a chapter, feel like you understood it, and a month later almost nothing is left. That is the normal outcome of reading, not a personal failing. Reading is passive: the text goes in, feels clear, and leaves no trace you can retrieve. Deepen makes it active, and it takes about a minute. HOW IT WORKS 1. Log the pages you read. Your progress bar moves. 2. Deepen asks you one open question. "What was the author actually arguing there?" or "What did you disagree with?" 3. You answer out loud, in your own words, for about a minute. 4. Your answer comes back as concepts, connections, and the questions you still have. 5. Those concepts join a map of everything you have ever read. Speaking an idea back in your own words is retrieval practice, which is the best-evidenced way to turn reading into memory. Almost nobody does it, because writing notes is work. Talking for a minute is not. THE MAP IS THE POINT Every concept you articulate becomes a node. When the same idea shows up in a second book, Deepen links them without being asked. Over a few months you stop having a pile of separate books and start having one connected body of reading. Read something about legitimacy in a history book, meet it again in a book about organizations, and the map shows you the two are talking to each other. ASK YOUR OWN LIBRARY Ask a question in plain language and get an answer built only from what you have said about the books you have actually read. Not the internet. Your own words, with the notes they came from listed underneath. NOTHING IS EVER SCORED Deepen does not test you chapter by chapter. Nobody wants to be graded on their evening. The questions after each session are open and never scored, because the point is to make you think, not to make you correct. When you finish a book, it asks once more: what will you still be thinking about in a year? Your answer joins the map like any other. It is a lap of honour, not an exam. ALSO IN THE APP - Keep the words you had to look up, with the book you met them in - Keep the passages worth remembering, and share one as a sticker - Scan a barcode to add a book, or import your Goodreads shelves - A home screen widget showing the book you are on WORKS WITH PAPER Deepen never asks what you are reading on. Paper, library copy, hardback, secondhand, an ebook, a PDF. You talk, so it does not matter. Nothing to sync, no highlights to export, no cable. BUILT TO BE PRIVATE Your notes and your map live on your iPhone. The map is computed on the device, so it works with no signal at all. There is no account and no sign-up. FOR PEOPLE WHO READ ON PURPOSE Deepen is for nonfiction readers who want the reading to stick: students, researchers, people working through a field, anyone who has ever finished a good book and been unable to say what it argued. DEEPEN PRO Deepen is free to try. Pro unlocks unlimited recaps, the map across every book, and Ask. - Monthly: $5.99 - Annual: $49.99 with a 7-day free trial Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel in your Apple Account settings. Privacy Policy: https://chamallox.github.io/deepen-legal/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Support : https://chamallox.github.io/deepen-legal/support/

Screenshots

Mammoth AI4 screens
Deepen4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard5 real differences · 5 level
Mammoth AI versus Deepen: the parameters behind the verdict, then further details
ParameterMammoth AIDeepen
PriceFreeFree
Rating4.4 (17 ratings)5.0 (1 ratings) — better
Positive reviews0.0% of reviews100.0% of reviews — better
Number of ratings17 — better1
Update frequencyEvery 3 weeksEvery 5 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.0 — better17.0
Further details — not scored
Size96 MB17 MB
Age rating+44+
DeveloperMarut KumarFrancois Sempe

Customer experience

Mammoth AI

All ratings17 ratings
Positive88.2%
Neutral0.0%
Negative11.8%
Written reviews4 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Deepen

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

Mammoth AI

Subscriptions3
  • Hermes AI Subscription$4.997 Days
  • Hermes AI Weekly Subscription3 Days trial$9.997 Days
  • Hermes AI Yearly Subscription$39.991 Year
3 purchases

Deepen

Subscriptions3
  • Pro Weekly$6.997 Days
  • Pro Annual7 Days trial$49.991 Year
  • Pro Annual7 Days trial$79.991 Year

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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