Extella is your customisable AI superagent that performs tasks using a system of Experts, Concepts and Rules. What it does for you:
Think of it as AI chat + automation + persistent memory + your own toolkit — all in one place.
You don’t write any code — Extella builds it for you. Experts live in your personal library and run directly on your device.
Beyond Experts, two more building blocks make it truly personal. Rules — tell Extella how to behave, and it follows them in every session, forever. Concepts — technical knowledge Extella picks up as you work together; the more you use it, the smarter it gets.
An Expert is a reusable capability Extella creates and uses to perform a specific task. They come in different levels of complexity:
send_telegram_message · convert_pdf_to_text · get_weather
decompile_binary_to_pseudocode — binary → disassembly → control-flow graph → readable pseudocode · generate_3d_model_from_photo — photo → depth map → 3D mesh → .obj · detect_vulnerabilities_in_code — repo → AST + data flow → CWE report
main_workflow runs fetch_emails → extract_data → check_crm → create_task → send_notification
external_api_expert (Telegram, OpenAI, Notion) · ml_ai_expert (PyTorch, TensorFlow, Hugging Face) · cli_wrapper_expert (ffmpeg, ImageMagick, pandoc, git) · library_expert (Pillow, pandas, BeautifulSoup) · system_expert · database_expert (SQLite, PostgreSQL)
Concepts are technical knowledge and solutions Extella learns and retains over time — so it gets smarter the more you use it. Use them for API patterns and endpoints, error-handling solutions, library recommendations, technical workarounds.
“For OCR, use Google Vision API” · “Retry on 429 errors with exponential backoff” · “PyPDF2 works better than pdfkit in Docker”
Rules define how Extella should behave — communication style, safety behaviors, workflow habits. Use them for tone, format and length preferences, confirmations and warnings, how tasks get handled.
“Always confirm before deleting anything” · “Keep responses short” · “No bullet points” · “Show reasoning step-by-step”
Not at all. Describe what you want in plain language:
“Send me an email every morning with my calendar summary” · “Download all images from this webpage” · “Find attached files in my email, analyze them and make a report”
Extella handles the technical side. You tell it what you need — not how to do it. Developers also get a REST API with 48 endpoints and an OpenAI-compatible mode.
No — and it gets more cost-efficient the more you use it. New users receive free bonus tokens to explore Extella and create their first Experts at no cost.
After that, Extella works on a token-based model with a key advantage: you pay once to build a solution, then run it as many times as you want at low cost. Unlike platforms that charge for every interaction, the heavy lifting happens at creation — not every time you run an Expert.
The more Experts you build, the more powerful your library becomes — and the less you spend over time. See pricing →
| Feature | Extella | Other AI platforms |
|---|---|---|
| No coding required | Plain language is all you need. Describe what you want — Extella builds the solution. No technical skills required. | Require technical knowledge, scripting or prompt engineering to get meaningful results. |
| Full task execution | Extella actually runs automations on your device instead of telling you how to do it. | Provide guidance and advice, but do not execute tasks. |
| Expert library | Every solution becomes a reusable Expert — you never solve the same problem twice. Its power compounds. | No persistent solution library. Every session starts from scratch. |
| Cost-effective | You pay once to create a solution, then run it infinitely at low cost. | You pay for every LLM call, for every task, every time. |
| Full memory | Extella remembers your preferences, tools and knowledge across all sessions. | No or limited memory — you re-explain your context every session. |
| Customizable agent | Set rules once for how Extella communicates and works — it follows them forever. | No persistent behavior customization; preferences must be repeated. |
| Local execution | Experts run on your device with direct access to your files and applications. | Code runs in cloud sandboxes with no access to your machine, files or apps. |
| Data safety | API keys and secrets are stored encrypted and never hardcoded in automations. | Partially protected — credentials often passed inline or stored insecurely. |
| Composable workflows | LEGO-style architecture: chain Experts into automations with conditions, loops and error handling. | No native workflow chaining — one-shot responses only. |
| Endless connectivity | Experts talk to any software, hardware or IoT device — and run on any of your machines by switching the target. No MCP required. | Limited to cloud environments; no access to local apps, hardware or remote devices. |
| Stack agnostic | Python, Node.js, Bash, R, Perl — any stack in one pipeline. | Typically Python only, or a single language per platform. |
Yes — your security is our number one priority:
Your files and sensitive data never leave your machine.
| macOS 13+ | ✓ |
| Windows 11+ | ✓ |
| Linux | ✓ |
No — an active internet connection is required. Extella uses it to process your requests and coordinate Expert execution, even though the Experts themselves run locally on your device.