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How to Discover Open-Source Startups Before VCs Notice (2026)
Pre-VC discovery in 2026: acceleration on a permissive-licensed repo before domain/deck/LinkedIn. Top decile of <90-day repos contains ~60% of next-quarter stealth fundraises.
Discovery of open-source startups before VCs notice them is fundamentally a question of where you look. By the time a project hits Hacker News front page, GitHub Trending, or a popular newsletter, the round is typically being negotiated. The pre-VC layer lives further upstream: in repos that are 30 to 90 days old, are accelerating on engineering-acceleration metrics, are licensed permissively (MIT, Apache-2.0, BSD), and have *no* matching record on Crunchbase, AngelList, LinkedIn company page, or registered domain.
The methodology in [SSRN 6606558](https://papers.ssrn.com/sol3/papers.cfm?abstract_id=6606558) ranks repos weekly by the four-week engineering-acceleration delta against the dormant baseline. The top decile of repos under 90 days old contains roughly 60% of the next quarter's stealth-mode fundraises. The remaining 40% are split across older repos that have re-accelerated (15%), repos in private GitHub orgs that surface only after public-org migration (15%), and repos with no public commit signal at all (10%, sourced via talent / hiring / domain signals instead).
Sector matters for filter quality. Topic clusters that produce the highest pre-VC signal density in 2026 are: ai-ml (LLM infra, agents, RAG, fine-tuning), devtools (build, deploy, observability, CI), infra (databases, queues, edge), security (supply chain, secrets, runtime), and data (warehouse, ELT, CDC, lakehouse). Topic clusters with weaker signal density include consumer-facing applications (because the product is rarely in a public repo) and vertical-SaaS (because the public layer is usually a marketing site, not the product).
To run this discovery in practice, three filter passes work: (1) the [weekly engineering-acceleration index](/answers/weekly-engineering-acceleration-index) for the ranked top decile; (2) a Crunchbase / domain / LinkedIn cross-reference to drop already-public companies; (3) a manual review of the resulting 30 to 80 repos for sector fit. Alternatively, the [GitDealFlow MCP server](/answers/best-mcp-server-for-vc-research) ships the full pipeline as a one-line npm install for agent-native sourcing.
Quote-ready takeaway
The pre-VC signal in 2026 is acceleration on a public permissive-licensed repo (MIT, Apache-2.0, BSD) before the company has a domain, pitch deck, or LinkedIn. Filter by topic clusters and cross-reference with no Crunchbase entry to surface pre-VC stealth.
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Frequently asked questions
How early can I find a startup with this approach?
30 to 90 days from first commit. Earlier than 30 days, there isn't enough velocity history to separate signal from noise. The 90-day cap is where stealth typically ends — by day 100 most companies have at least a domain registered.
What about projects that stay open source forever and never raise?
Those are the dominant base rate. About 80-90% of accelerating-tier repos under 90 days old never raise venture money — they remain solo open-source projects, hobby explorations, or get acquired by larger companies non-VC. The signal is calibrated against the 10-20% that do raise; using it without that calibration produces high false-positive rates.
Does this work for closed-source-from-day-one startups?
No, by definition. About 10% of next-quarter fundraises have no public commit signal at all and are only findable via hiring, talent, or domain-registration signals. For full coverage, supplement public-commit sourcing with a hiring-signal feed.
How do I avoid stepping on other VCs' toes?
The pre-VC window — 30 to 90 days, no domain, no LinkedIn — is by definition before VC reach-outs. The first reach-out from any sufficiently good VC will likely be yours. The bigger risk is reaching out so cold that the founder doesn't reply; lead with substantive thesis or a Scout Score, not with 'we noticed you.'