Comparison

Lemen vs Sigma Domain

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

Head to head
About

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.

Highlights
  • Access 30+ top AI models
  • End-to-end encryption
  • Anonymous message routing
  • Smart model routing
  • Web search integration
  • Stock price checking
  • Python code execution
Features
Read full description

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

About

Sigma Domain

Features
Read full description

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

Lemen4 screens
Sigma Domain4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

Scorecard1 real difference · 8 level
Lemen versus Sigma Domain: the parameters behind the verdict, then further details
ParameterLemenSigma Domain
PriceFreeFree
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
Update frequency—Every 2 days
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS14.0 — better16.6
Further details — not scored
Size14 MB70 MB
Age rating17+4+
DeveloperLemenSigma Domain

In-app purchases

7 purchases

Lemen

Subscriptions4
  • Basic Plan$6.991 Month
  • Starter Plan$26.001 Month
  • Pro Plan$52.001 Month
Show 1 more
  • Max Plan$104.991 Month
One-time3
  • $5 Lemen AI usage credits$6.99
  • $10 Lemen AI usage credits$12.99
  • $20 Lemen AI usage credits$24.99
2 purchases

Sigma Domain

Subscriptions1
  • Standard Monthly Sigma Domain$5.991 Month
One-time1
  • Additional Usage - Sigma Domain$9.99

Questions

Is Lemen free?
Lemen is free to download, with in-app purchases available.
Is Sigma Domain free?
Sigma Domain is free to download, with in-app purchases available.
Do Lemen or Sigma Domain have ads?
Neither Lemen nor Sigma Domain shows ads.

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