Harmonic and SourceScrub both track private companies, but they serve different buyers and mandates.
Harmonic is built for venture capital and corporate development teams that need deep coverage of early-stage companies and the people behind them, powered by an AI agent for open-ended, natural language research queries.
SourceScrub serves PE and M&A teams by extracting data from conference attendee lists and industry award programs rather than crawling company databases, giving it strong coverage of lower and middle-market founder-owned businesses.
Below, we’ll explore each platform’s features in depth and share pointers on choosing the right tool for your use case.
Harmonic vs. SourceScrub: Comparison at a glance
What is Harmonic?
Harmonic is a startup discovery engine with proprietary data on more than 35 million companies and over 195 million people, covering the full company lifecycle from stealth and pre-seed through IPO. Unlike databases that rely solely on public sources, Harmonic receives routine portfolio updates from the world’s leading investors, giving it earlier and more accurate coverage of companies that have not yet appeared in public registries or press.
What distinguishes Harmonic's architecture is the combination of company data and people data. Harmonic tracks talent at every level of an organization, from junior engineers and operators to founders and executives. Because the data extends below the executive layer, investors can evaluate team composition and talent density in ways that firmographic databases cannot. Tracking individuals also makes it possible to identify founders before they have formed a company, since the signal often appears at the individual level first. For example, when a senior employee leaves a role without listing a new company, Harmonic flags this individual as one to watch.
What is Scout?
Scout is Harmonic's AI agent. Connected to Harmonic's proprietary private market data, Scout gains deep knowledge of startups and private markets. Scout searches across your firm's network as well, including LinkedIn and calendar connections, surfacing warm introduction paths or proposing people to meet when travelling to a different city. Scout can also generate a relevance score that features startups based on a pre-defined criteria or companies that users frequently interact with. Therefore, users do not have to build their own models to get predictive scores.
What is SourceScrub?
SourceScrub is a deal-sourcing platform built for private equity, M&A, and investment banking teams. Its focus is privately-owned and founder-owned businesses, including many that have never raised venture capital and do not appear in traditional startup databases.
The platform's defining feature is its sources-first data model. SourceScrub connects more than 17 million company listings to over 290,000 origin sources, including conference attendee lists and industry award programs. For PE teams running thesis-driven sourcing in traditional industries, this approach surfaces companies that do not show up in VC-oriented databases.
SourceScrub’s AI tool, SourcingGPT, provides screening and analysis, with custom scoring that enables teams to configure rule-based algorithms to rank companies against their strategy. SourceScrub also offers conference planning tools that scrub attendee lists against investment parameters.
Feature-by-feature breakdown
Data coverage
Harmonic tracks more than 35 million companies with consistent depth across the full company lifecycle, from stealth and seed through Series B and beyond. The database covers the same growth-stage and later-stage companies as traditional platforms, but goes deeper at early stages. An Earlybird benchmark of 1,000 companies spanning stealth through growth-stage founders showed that Harmonic tracked 98% of relevant signals, whereas the competition tracked only around 75%.
SourceScrub's sources-first model is purpose-built for PE teams doing conference-based sourcing and tracking bootstrapped businesses that never raised venture funding. With over 220,000 origin sources, it provides strong coverage of founder-owned businesses in traditional industries that may not appear in VC-oriented databases.
People data
Harmonic tracks over 195 million people profiles at every seniority level. Because the data extends to engineers and operators rather than just executives, investors can assess a company's technical depth and team composition as part of its research. Harmonics AI agent Scout searches across people profiles in natural language, so teams can run queries like "Find AI companies with founding teams from DeepMind, and evaluate their potential to win their market based on background and market activity."
SourceScrub provides executive contacts and email addresses, supporting outreach but not team-level talent intelligence.
AI and deal sourcing capabilities
Harmonic's Scout handles open-ended research queries through natural language. When a business unit asks a corp dev team to evaluate an emerging technology area, Scout draws on Harmonic's proprietary data to map the market and surface relevant companies against the stated criteria. Scout can handle research that is ambiguous or exploratory, where the criteria are not yet defined well enough to encode into rules.
SourceScrub's SourcingGPT, combined with the platform’s custom scoring, offers a structured and repeatable approach to thesis screening. Teams define the signals and weights that matter, and the system ranks targets accordingly. This process works well for teams with established theses and known criteria.
Conference intelligence
Harmonic maps the 200 most important conferences for early- and growth-stage investors, tracking which founders and companies attend and surfacing signals that emerge from those events, so that Harmonic users can act on this intelligence.
SourceScrub's conference planning tools let teams scrub attendee lists against investment parameters and plan outreach before they arrive. For PE teams that source heavily at industry trade shows, this is an advantage of using SourceScrub.
Data freshness
Harmonic refreshes company and people data on a cohort-based cycle, with thousands of priority companies updated daily. SourceScrub does not publicly specify its refresh cadence. For investors tracking momentum signals like hiring velocity or funding activity, a known and fast refresh cycle reduces the risk of acting on stale information.
Integrations
SourceScrub offers native bidirectional sync with DealCloud, which many PE teams use as their primary CRM. For teams running their pipeline on DealCloud, this integration means data flows directly into the system of record without manual export. SourceScrub also integrates with Salesforce and Affinity, and offers cloud data delivery via Snowflake and Amazon ADX.
Harmonic is compatible with all CRMs via Polytomic and has a native Affinity integration. The API supports custom workflows, and Harmonic recently launched an MCP for connecting to any LLM.
Which platform is right for you?
For VCs and growth investors
Harmonic is the stronger fit. Its database covers the full investment lifecycle with consistent depth, and over 195 million people profiles make it possible to track founder activity before new projects surface publicly. Scout handles thesis-driven research and company evaluation through natural language, so teams can move from a market question to a ranked set of opportunities without manual research. And because Harmonic integrates your firm's full network, warm paths into the most relevant founders surface automatically.
For corporate development
Harmonic provides the full intelligence stack that corp dev teams need to move quickly on broad mandates. Scout handles market mapping, target evaluation, and meeting preparation through natural language, compressing weeks of research into minutes. People data across the full organizational chart supports acqui-hire evaluation and vendor identification for portfolio companies. For mandates that include AI-native targets, many of which are only a few years old and absent from traditional M&A databases, Harmonic's coverage captures them before acquisition prices rise with VC backing.
SourceScrub remains a strong fit for corp dev teams at large enterprises running structured M&A processes focused on mature, founder-owned businesses in traditional industries. If your targets are primarily later-stage private companies, its predictive scoring and analyst support serve that workflow well.
For PE and M&A teams
SourceScrub is better suited for PE and M&A teams, particularly for those sourcing from conferences and tracking bootstrapped businesses in traditional industries. Its sources-first model surfaces companies that do not appear in VC-oriented databases, and its DealCloud integration fits the PE workflow.
Harmonic is relevant for PE teams whose mandates include tech-enabled or AI-native targets, where full-spectrum company coverage, granular people data, and Scout's research capabilities change what is possible in sourcing and diligence. Beyond deal sourcing, PE teams are increasingly using Scout to identify talent and vendors for their portfolio companies, drawing on Harmonic's people database to surface candidates that fit specific criteria.
For GTM teams
Harmonic tracks hiring events and funding rounds as they happen, so GTM teams can time outreach to the moment a company is most likely to buy. Harmonic's people data identifies the right contact at every level of an organization, making it possible to reach the target contact rather than defaulting to whoever appears in a company profile.
Ready to see how Harmonic covers your market? Request a demo to explore Scout and Harmonic’s people intelligence layer.
