"ai deal sourcing" now means three different things: databases with ai search bolted on, ai-native indexes of announced activity, and pre-announcement signal tools. this list covers the main options honestly - including where each one beats the others.
quick comparison
| tool | signal type | earliest you hear about a company | agent access | price |
|---|---|---|---|---|
| frontrun | investor follow-graph (pre-round) | before any announcement, often at under 100 followers | api + mcp | $99/mo, 7-day trial |
| harmonic | company-formation + web index | registration / first web presence | api + agentic search | quote-based, reported ~$26k/yr |
| inven | ai-native company index (28M+) | web presence | platform + api | quote-based |
| pitchbook | announced rounds, filings | announcement | platform | enterprise, ~$25k+/yr |
| crunchbase | announced rounds, self-reported | announcement | platform + api | from ~$49/user/mo |
| cb insights | announced activity + research | announcement | platform | enterprise |
1. frontrun - pre-round social signal
best for: hearing about companies before any database has them.
frontrun tracks what 1,000+ venture investors do on X - specifically, who they start following. when several tracked investors converge on the same small account, the company gets flagged with a timestamp. that flag routinely lands months before a round:
- @techdollarhq - flagged at 13 followers, $3M pre-seed 123 days later
- @orthogonal_sh - flagged 184 days before a $4.3M round led by Pantera
- @impeccable_ai - flagged 75 days before a seed led by a16z
it is deliberately narrow: no 28-million-company index, no announced-round history. daily reports, a live feed, semantic thesis search, and everything over api + mcp so your own agent can query it (npx frontrun-mcp-server --setup). $99/mo pro with a 7-day free trial. crypto-native roots, expanding across ai/robotics/fintech.
where it loses: if you need full market maps of established companies or announced-deal history, pair it with one of the indexes below.
2. harmonic - the biggest startup index
best for: enterprise funds that want coverage of everything that incorporates.
harmonic tracks company formation at index scale and layers strong agentic search on top ("ai companies in sf, raised last year from top investors, no contact in 12 months"). used by major funds; the polish is real. it is also enterprise-priced (quote-based; reported around $26k/yr) and its signal starts when a company becomes visible to the web - registration, site, filings. more on the tradeoff in harmonic alternatives.
3. inven - ai-native index for pe and ib
best for: private-equity and banking workflows over the full private market. 28M+ companies, strong for off-market pe deal search. less venture-signal, more market-mapping.
4. pitchbook - the incumbent system of record
best for: announced-deal data, fund performance, comps. the default database of record. nobody hears about a pre-seed there first, and it prices like the enterprise tool it is.
5. crunchbase / cb insights - broad and accessible
best for: quick lookups and top-of-funnel research on companies that already announced. affordable (crunchbase) or research-heavy (cb insights); both retrospective.
how to choose
- you want deals before they're deals → frontrun ($99/mo vs enterprise quotes elsewhere).
- you want the whole market mapped → harmonic or inven.
- you want the system of record for announced rounds → pitchbook.
- you're building an agent → prioritize tools with mcp/api access. frontrun ships mcp natively; most incumbents don't.
honestly: serious funds run a pre-round signal layer AND an index. they answer different questions.
read next: how to build an ai deal flow agent · see the signal live: trending startups today