Validate ideas. Plan your business. Build your product. Run your operations.
One AI partner. One platform. Zero prior tech experience needed.
FCOS Symbiote is an AI operating system that fuses with you. It knows your business, your decisions, your context — and gets smarter every time you use it.
Validate ideas. Plan businesses. Build products. Run operations. From one connected platform — no technical background required.
Start building →
One platform. Use the whole suite, pick a product, or just talk to the free agent.
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Think Tank + Synapse + Sprint + Build + Brainz. Your complete AI-powered business stack in one login.
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Use Synapse as a Notion replacement, Sprint as a Drive replacement, or Build as your coding IDE — independently.
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Plug FCOS into your existing workflow. 29 named app replacers, Notion integration, and an open API.
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Already on ChatGPT Plus? Use the FCOS Master Agent at zero API cost. No key required — just start talking.
Five products. One platform. All connected to the same AI context.
Your Notion replacement. Block-based workspace, project isolation, full-text search, and 8 page templates.
Open Synapse →Your Drive replacement. File and asset manager with drag-drop upload, folder management, and file preview.
Open Sprint →Coding IDE with an agentic AI panel. 246 operations, proof bundles, and a governed build pipeline.
Open Build →Multi-platform agent builder. Download the knowledge pack. Configure your GPT. Keep it current.
Open Brainz →20 populated demo apps across 14 business categories. See what you can build — then build it yourself.
See demos →The symbiote. Validate ideas, plan businesses, build products, and run operations — all in conversation.
Start here →The FCOS Store is coming. List your apps, templates, and tools. Free to browse, free to list.
Build it once. List it free. Keep almost all of what you earn. The FCOS Store is an open marketplace for founder-built apps, templates, and tools.
1% FCOS · 2% ads · 2% creator promotion · 2% affiliate pool — shared monthly with active community members
Coming 2026 · Free to list · Open to all founders
Free forever for the basics. £19 solo. £69 for teams. No contracts, no asterisks.
For founders getting started. Everything you need to validate and begin.
For solo founders building seriously. Unlimited conversations and more capacity.
For co-founders and small teams. Shared workspace, collaborative sessions.
The FCOS Agent via ChatGPT Plus is always free — it uses your existing subscription.
FCOS is in active development. Early access is open. Be part of what this becomes.
Testimonials coming soon — from the first founders who fused with their symbiote and built something real.
EFGOStart for free today. Use the symbiote. Build something. Shape the platform.
Start for free →