Lemen vs Sigma Domain
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Lemen
Access over 30 leading AI models with end-to-end encryption for private conversations. This platform offers smart routing to optimal models and powerful agent tools for web searches, stock checks, and code execution.
- Access 30+ top AI models
- End-to-end encryption
- Anonymous message routing
- Smart model routing
- Web search integration
- Stock price checking
- Python code execution
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Lemen is a platform that gives you access to the world’s top AI models. Your conversations are encrypted and routed anonymously, so no AI provider can build a profile on you or your data. Whether you're researching, coding, or exploring ideas, Lemen protects your privacy every step of the way. Key Features: All-in-One Access: Tap into 30+ top AI models from leading providers. One Step Encryption: One step to full privacy — Lemen can’t read your messages, and models never see who you are. Smart Routing: Automatically sends your question to an optimal model for the job — or lets you choose. Powerful Agent Tools: Search the web, check stock prices, run Python code, and more. Work smarter, search deeper, and stay anonymous — with Lemen. Terms & Conditions: https://docs.lemen.ai/terms Privacy Policy: https://docs.lemen.ai/privacy
Sigma Domain
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Sigma Domain is the AI workspace where you bring the tools — and the AI does the work. The conversation is powered by Claude, the model family behind the world's best coding and agent systems. When you want a sanity check, tap the brain button and get a second opinion from a catalog of 70+ leading models — OpenAI, Meta, Mistral, DeepSeek, Amazon, and more — with a summary of where they agree or differ. YOUR AI TOUR GUIDE Going somewhere? Start a tour and Sigma Domain narrates the places you pass — the history, the architecture, the stories — spoken aloud while you drive or walk. Road trips, neighborhood walks, museum visits: it's like a private radio station about wherever you are. POST YOUR OWN TOOLS Most AI apps are just chat. Sigma Domain includes a marketplace of thousands of ready-to-use tools — and you can register your own functions, APIs, and integrations, public or private. Your tools become part of the AI's toolkit, callable in plain English by you, your team, or anyone you share them with. LIVE MAPS YOU BUILD TOGETHER Search properties and places, pin and compare them on a shared map, vote with your team, and generate reports — commute times included. SKILLS Expert playbooks the AI loads on demand: create and edit Word documents, PowerPoint decks, Excel spreadsheets, PDFs, and more — so answers become finished documents, not just text. AI JOBS Hand off multi-step work. The AI plans the steps, calls the right tools, and reports back when it's done. WHY SIGMA DOMAIN - Powered by Claude for the main conversation — the engine behind today's best AI agents - Second opinions from 70+ models with one tap - A tool marketplace you can add to — publish your own tools in minutes - GPS-aware audio tours, live shared maps, document skills, and automated jobs - Natural conversation — no prompt engineering required Bring your tools. Ask for outcomes. Sigma Domain does the rest. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is iOS requirement: Lemen at 14.0 against Sigma Domain's 16.6. 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
Both are free to download. Lemen sells 7 in-app purchases, starting at $6.99 per month and Sigma Domain sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.
| Parameter | Lemen | Sigma Domain |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | — | Every 2 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 14 MB | 70 MB |
| Age rating | 17+ | 4+ |
| Developer | Lemen | Sigma Domain |
In-app purchases
Lemen
- Basic Plan$6.991 Month
- Starter Plan$26.001 Month
- Pro Plan$52.001 Month
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- Max Plan$104.991 Month
- $5 Lemen AI usage credits$6.99
- $10 Lemen AI usage credits$12.99
- $20 Lemen AI usage credits$24.99
Sigma Domain
- Standard Monthly Sigma Domain$5.991 Month
- Additional Usage - Sigma Domain$9.99









