Comparison

Open Agent vs Mammoth AI

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

Head to head
About

Open Agent

Features
Read full description

Open Agent gives you a private Hermes Agent on your phone. Create your agent, open its Convos group, and start chatting. No terminal, no server setup, no Docker, and no MacBook running 24/7. Your Hermes Agent stays online for you, replies inside an end-to-end encrypted XMTP conversation, and is designed to learn from you over time. Teach it preferences, context, and tasks through natural chat. Open Agent is built for the next step in personal agents: a private companion first, and an autonomous worker later. As your agent grows, it can become ready to interact with other agents and enter the Open Agent market. With Open Agent you can: - Create one private Hermes Agent for your account - Chat inside Convos over XMTP - Keep your agent online from your phone - Skip infrastructure setup entirely - Build personal context over time - Use monthly LLM API credits with OpenAgent Pro Open Agent makes Hermes feel like a companion, not an agent. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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

Screenshots

Open Agent4 screens
Mammoth AI4 screens

Verdict

The call

The clearest difference is update cadence: Open Agent at every 9 days against Mammoth AI's every 3 weeks. Mammoth AI's advantage is iOS requirement (15.0 vs 26.0). On price, ads, in-app purchases and device support 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. Open Agent sells 2 in-app purchases, starting at $4.99 per 7 days and Mammoth AI sells 3 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Open Agent ships an update every 9 days, Mammoth AI every 3 weeks. The most recent releases landed on October 1, 2026 and October 19, 2026 respectively.

Scorecard2 real differences · 8 level
Open Agent versus Mammoth AI: the parameters behind the verdict, then further details
ParameterOpen AgentMammoth AI
PriceFreeFree
Rating—4.4 (16 ratings) — better
Positive reviews—0.0% of reviews
Number of ratings—16 — better
Update frequencyEvery 9 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
Monetization—Free with in-app purchases
DevicesiPhone, iPadiPhone, iPod
Requires iOS26.015.0 — better
Further details — not scored
Size101 MB96 MB
Age rating17+4+
DeveloperHoang Nguyen VuMarut Kumar

In-app purchases

2 purchases

Open Agent

Subscriptions2
  • OpenAgent Pro Weekly$4.997 Days
  • OpenAgent Pro Yearly3 Days trial$99.991 Year
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

Questions

Is Open Agent free?
Open Agent is free to download, with in-app purchases available.
Is Mammoth AI free?
Mammoth AI is free to download, with in-app purchases available.
Do Open Agent or Mammoth AI have ads?
Neither Open Agent nor Mammoth AI shows ads.
Which is updated more often, Open Agent or Mammoth AI?
Open Agent ships an update every 9 days, and Mammoth AI every 3 weeks. Most recently, Open Agent was updated on October 1, 2026 and Mammoth AI on October 19, 2026.

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