Review sites surface which SaaS companies are active. Reaching them requires a separate email workflow.
G2 and Capterra let you browse SaaS companies by category, filter by review count, and identify which products are gaining traction. That makes them useful starting points for building a target account list. What they do not provide is email addresses.
A category page on G2 or Capterra gives you a company name, a product description, and a link to the vendor website. Getting from that listing to a verified, sendable address means working through a separate discovery and verification workflow — and SaaS company email infrastructure introduces specific risks that differ from agency directory sourcing.
Why SaaS company email discovery from review sites works differently.
Prospecting SaaS companies from review sites is not the same as prospecting agencies from Clutch or DesignRush. Three factors make it distinct.
Company type and email infrastructure. SaaS companies, by nature, tend to be more deliberate about their email infrastructure. They use Google Workspace or Microsoft 365 with stricter configurations, and security-conscious teams often apply policies that make SMTP probing inconclusive. This increases catch-all and unknown results compared to smaller service businesses.
Structured email patterns are common — but not universal. Mid-size SaaS companies frequently follow predictable patterns like firstname.lastname@company.com or firstname@company.com. This makes finder tools more effective than they would be against small agencies with unpredictable setups. However, early-stage startups and enterprise vendors each introduce different complications: startups may not have indexed addresses yet, and enterprise vendors may use regional domains, product-specific subdomains, or role hierarchies that obscure who the decision-maker actually is.
The work email and personal email boundary is stricter. SaaS professionals tend to have a sharper separation between work and personal email. This matters for discovery because the patterns that work for one domain may not generalize across even similar-looking companies. Each domain needs its own verification pass — there is no shortcut based on company type alone.
The full workflow: category page to verified email.
| Step | Input | Output | Key decision |
|---|---|---|---|
| Category page | Review site URL, filter criteria | Company list with vendor website links | Which category and filters match your ICP |