Mammoth AI vs The Abyss
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Persistent memory vault
- Self-improving skills
- Messaging platform integration
- Customizable autonomy levels
- Runs on your own infrastructure
- Open source
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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
The Abyss
Control your self-hosted AI agent from your iOS device. Stream responses live, see tool usage, and attach images. Supports hands-free voice commands and offline transcript viewing. Manage multiple AI instances with a privacy-first design.
- Live token streaming for AI responses
- Transparent tool call visualization
- Multimodal input with image attachments
- Hands-free voice mode with on-device transcription
- Server-side, searchable conversation history
- Support for multiple AI backends
- Privacy-first design with local data storage
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The Abyss is the iOS companion for Hermes - your self-hosted AI agent running on your own machine. Connect over your local network or Tailscale, send prompts, watch the agent think and reach for tools in real time. The Abyss is a remote control. Hermes is the brain. You own both. Built for people who already host their own things. CHAT - Live token streaming. Watch the agent's reply appear as it's generated. - Transparent tool calls. See the agent reach into your shell, files, or the web - with each tool's name and arguments shown as a card. - Multimodal. Attach images from the photo library and send them with your prompt. - Slash commands. Trigger agent-side commands from a clean, keyboard-friendly composer. VOICE MODE - Hands-free conversation. Dictate prompts and hear the reply spoken back. - On-device transcription. Your voice is transcribed locally; the text is what gets sent to your agent. - Bring-your-own TTS. If your Hermes backend streams text-to-speech, you hear the agent in a neural voice; otherwise it falls back to iOS voices. SESSIONS - Server-side history. Every conversation lives on your own Hermes server, not ours. - Searchable, renameable, pinnable. Find the thread you need, give it a name, keep it on top. - Local cache. Scroll the transcript even when you're offline. MULTIPLE BACKENDS - Run more than one Hermes instance? Add them all. Switch active with one tap. - Pair a second device by scanning a QR code. Credentials never cross our servers - we don't have any. - Each backend gets its own identity colour so you always know which agent you're talking to. DEMO MODE - Not running Hermes yet? Try the demo. A scripted preview shows how the real client behaves, without any setup. No account, no network, no obligation. PRIVACY-FIRST BY DESIGN - All credentials live in iOS Keychain. Face ID required before revealing or sharing them. - No analytics. No third-party SDKs. No telemetry. - The Abyss only talks to the backends you point it at. Apple processes any future purchases; that's the only third party in the loop. - App data flows between your device and your own Hermes backend. Nothing else. REQUIREMENTS - A running Hermes Agent on a machine you control. - Network reachability to that machine. Same Wi-Fi works; Tailscale (or another mesh) is recommended if you want to reach the agent from anywhere. The Abyss is not a hosted AI service. It is a remote control for an AI agent you host yourself.
Screenshots
Verdict
The clearest difference is rating: Mammoth AI at 4.4 against The Abyss's 3.0. Mammoth AI also leads on ratings volume (18 vs 1) and update cadence (every 3 weeks vs every 2 months). The Abyss's advantage is in-app purchases (none vs 3). On price, review sentiment, ads 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
Both are free to download. Mammoth AI sells 3 in-app purchases, starting at $4.99 per 7 days. The Abyss asks for nothing beyond the download.
Mammoth AI holds the better App Store score, 4.4 against 3.0. That said, the two scores are not equally well evidenced: Mammoth AI has 18 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 0% and 0% positive.
Mammoth AI ships an update every 3 weeks, The Abyss every 2 months. Both last shipped on November 10, 2026.
| Parameter | Mammoth AI | The Abyss |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (18 ratings) — better | 3.0 (1 ratings) |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| Number of ratings | 18 — better | 1 |
| Update frequency | Every 3 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 26.5 |
| Further details — not scored | ||
| Size | 96 MB | 11 MB |
| Age rating | +4 | 4+ |
| Developer | Marut Kumar | Vladimir Adamovic |
Customer experience
Mammoth AI
The Abyss
In-app purchases
Mammoth AI
- Hermes AI Subscription$4.997 Days
- Hermes AI Weekly Subscription3 Days trial$9.997 Days
- Hermes AI Yearly Subscription$39.991 Year
The Abyss
No in-app purchases









