StartupDeckAI vs GBrain
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- Comparisons
- GBrain
GBrain is a free, open source memory layer that you run yourself. It stores notes and facts with their sources, builds a graph of people, companies and projects, and serves it to AI agents over MCP. Founder OS is a hosted workspace that reads a company’s billing and work tools for its founder.
How Founder OS works See pricing
We make StartupDeckAI, so we are not neutral. Everything here about GBrain comes from github.com/garrytan/gbrain, read on 8 October 2026. If something has changed or we got it wrong, tell us at [email protected] and we will fix it.
Who should pick which
If you want to own and run your memory layer, pick GBrain. If you want nothing to host, pick us.
Pick GBrain if
- You are comfortable running software yourself from the command line.
- You want it free and open source, under the MIT licence.
- You want memory for agents such as Claude Code, Cursor and Codex.
Pick StartupDeckAI if
- You do not want to host or maintain anything.
- You want company figures worked out from your billing tool.
- You want a decision log and idea validation in one account.
Side by side
What each product offers, in plain terms. GBrain details as of 8 October 2026.
| What we compared | StartupDeckAI | GBrain |
|---|---|---|
| Price | Pro Plus, ₹9,999/month. Founder OS is not in the free trial | Free and open source under MIT. You pay for your own hosting and AI models |
| Hosting | Hosted by us | You run it, on PGLite or Postgres |
| Connects to | Read only connections to 20 tools, including Stripe, Razorpay, HubSpot, Linear, GitHub, Slack and Notion | Gmail, Calendar and Contacts, plus webhooks for meetings and email |
| AI agents | No MCP server | MCP with OAuth, and setup guides for many agents |
| Billing data | Revenue, churn and customer counts from Stripe or Razorpay | Not described in their README |
| Set up | Sign up and connect a tool in the browser | Install with the command line |
Price
- StartupDeckAI
- Pro Plus, ₹9,999/month. Founder OS is not in the free trial
- GBrain
- Free and open source under MIT. You pay for your own hosting and AI models
Hosting
- StartupDeckAI
- Hosted by us
- GBrain
- You run it, on PGLite or Postgres
Connects to
- StartupDeckAI
- Read only connections to 20 tools, including Stripe, Razorpay, HubSpot, Linear, GitHub, Slack and Notion
- GBrain
- Gmail, Calendar and Contacts, plus webhooks for meetings and email
AI agents
- StartupDeckAI
- No MCP server
- GBrain
- MCP with OAuth, and setup guides for many agents
Billing data
- StartupDeckAI
- Revenue, churn and customer counts from Stripe or Razorpay
- GBrain
- Not described in their README
Set up
- StartupDeckAI
- Sign up and connect a tool in the browser
- GBrain
- Install with the command line
What GBrain does well
- Free and open source, so you own the code and the data.
- A graph of typed entities, with search that combines keywords and meaning.
- Writes answers with citations, and says where it has gaps.
- A mature MCP setup, with OAuth and scoped access for each agent.
Where StartupDeckAI is different
- Nothing to install or host.
- Works out company figures from billing data by formula.
- A decision log with reasons, alternatives, risks and expected outcomes.
- Includes idea validation, from the Free plan up.
Infrastructure you run, or a product you use
GBrain is software for people who want their own memory layer. You install it, connect your sources, and point your agents at it. It suits technical founders and small teams who would rather own the stack than rent it.
Founder OS is a hosted product with a narrower job: the founder’s figures, notes and decisions, from the tools the company already uses.
Founder OS is early. Today it works out revenue, churn and customer counts from Stripe or Razorpay, keeps your notes and a log of decisions with the reasons and expected outcome for each, writes a briefing where every line points to the record behind it, matches the same customer across different tools, and answers a question you type, keeping only the statements that cite your records. It does not yet read call transcripts or compare your figures with other companies.
Questions
- Does Founder OS use a knowledge graph?
- Founder OS keeps a record of the customers, subscriptions and other items it reads from each tool, and matches the same customer across tools by email, business domain or a CRM link. Ask answers a question you type from those records, keeping only the statements that cite them. It is a company graph for one company, not a general knowledge graph.
- Can I self-host StartupDeckAI?
- No. StartupDeckAI is hosted by us. If self-hosting matters most, GBrain is the better fit.
- What does Founder OS do today?
- Founder OS is early. Today it works out revenue, churn and customer counts from Stripe or Razorpay, keeps your notes and a log of decisions with the reasons and expected outcome for each, writes a briefing where every line points to the record behind it, matches the same customer across different tools, and answers a question you type, keeping only the statements that cite your records. It does not yet read call transcripts or compare your figures with other companies. It reads 20 tools, only ever reads, and is part of the Pro Plus plan at ₹9,999/month. The security page lists exactly what it reads from each tool.
Sources
Pages we read on GBrain's site on 8 October 2026. Prices and plans change, so check them before you decide.
- GBrain README on GitHub github.com/garrytan/gbrain
Our own details come from our pricing page and the methodology behind each report.
Other comparisons
On this page
- Who should pick which
- Side by side
- What GBrain does well
- Where StartupDeckAI is different
- In more detail
- Questions
- Sources
GBrain details checked 8 October 2026.