Built for large-scale projects where other AI editors lose their way.
Sidian was born from a simple frustration: existing AI code editors work great on small projects, but completely fall apart on large, enterprise-scale codebases. We built the solution we needed - and now we're sharing it with the world.
Explore FeaturesWhy existing AI editors fail on large projects
In early 2025, our founder tested every major AI code editor on the market. They all worked beautifully on small projects - impressive autocomplete, smart suggestions, fast responses.
But the moment you point them at a large, enterprise-scale codebase? Complete breakdown.
The AI agents would constantly read files, then immediately forget what they read. They'd lose track of architectural decisions. They'd suggest code that conflicted with existing patterns. And worst of all - they'd consume massive amounts of tokens re-reading the same files over and over.
We knew there had to be a better way.
Our Solution
We built Sidian with a revolutionary Context Engine that truly understands your entire codebase - not just the file you're looking at. The AI can instantly access even the most niche details about your project without re-reading files.
5,000+
Active Beta Users
4
Months in Beta
10+
AI Models Supported
Jan 2025
Founded
Context Engine
Our proprietary context engine indexes and understands your entire codebase. Unlike competitors, the AI instantly recalls project patterns, architectural decisions, and coding conventions - without burning tokens re-reading files.
Learn MoreMulti-Model Intelligence
Choose from 10+ AI models including OpenAI, Anthropic, Google Gemini, DeepSeek, and more. Run models locally with Ollama or LM Studio for complete privacy.
Learn MoreProject Memory
Sidian learns and remembers your coding patterns, team conventions, and project preferences. Define rules once, and every AI suggestion follows them.
Learn MoreRevolutionizing enterprise software engineering
While competitors like Cursor and Windsurf struggle with large codebases, Sidian was purpose-built for enterprise-scale projects. Our vision is to transform how teams build and maintain complex software systems.
We're currently developing a custom embedding model specifically designed for code understanding. This will make our Context Engine even more efficient, accurate, and cost-effective - pushing the boundaries of what's possible with AI-assisted development.
Born in January 2025 from real developer frustration, Sidian launched its beta on September 16th, 2025. With over 5,000 active beta users and growing, we're preparing for public launch in 2026.
Large Codebases
Zero Code Retention
Context Aware
Token Efficient
From frustration to innovation
January 2025
The Idea
After testing every major AI code editor and watching them all fail on large projects, we decided to build the solution ourselves.
September 16, 2025
Beta Launch
Sidian beta goes live with the Context Engine at its core - finally, an AI editor that doesn't forget.
January 2026
5,000+ Active Beta Users
Four months into beta with a thriving community of developers using Sidian daily on enterprise-scale projects. Custom embedding model nearing completion.
Q2 2026
Public Launch
Full public launch planned with Pro and Enterprise tiers, team collaboration features, and our custom embedding model for even faster context retrieval.
Ready to work on large projects without limits?
Join 5,000+ developers who've discovered what AI-assisted coding should feel like. Finally, an editor that scales with your ambitions.