G2 shows who uses software. It does not show how to contact them.
G2 is a software review platform. Companies listed on G2 have product pages, category rankings, and user-submitted reviews. This data makes G2 useful for two B2B prospecting tasks: identifying software companies in a category, and finding who currently uses a competitor's product.
What G2 does not provide is email addresses. Reviewer profiles show a job title and company name. Category listings show a product name and vendor website. Getting from a G2 signal to a verified, sendable email address requires separate discovery work — and the quality of what you find depends heavily on the type of company you are targeting.
What G2 is useful for in B2B prospecting.
G2's value in a prospecting workflow is account selection and signal sourcing, not contact discovery.
| G2 signal | What it tells you | How to use it |
|---|---|---|
| Software category listing | Companies that offer or use software in this space | Build a target account list by category |
| Competitor product reviews | Companies that already use a competing product | Competitor customer sourcing — identify accounts already in-market |
| Reviewer job title and company | A named person at a named company used the product | Start a finder search for that person's email |
| G2 score and review count | Product adoption signal — market presence | Prioritize accounts by category reach or momentum |
| Vendor profile website link | Company domain | Entry point for email pattern research |
G2 is strongest for competitor customer discovery. A reviewer who rated a competing product has already evaluated that software category — they are an in-market account. That makes G2-sourced competitor review lists higher intent than a cold category list, but it does not make the emails easier to find or verify.
The path from a G2 profile to a verified email.
| Step | What happens | Quality risk |
|---|---|---|
| Identify target on G2 | Company name, reviewer name, job title, domain via vendor website | No email provided anywhere on G2 |
| Research company domain | Visit the vendor website or company website linked from the G2 profile | SaaS companies may use custom domains, subdomains, or multiple domains |
| Run email finder against domain | Pattern-matched or LinkedIn-sourced address for the named reviewer or target contact | Reviewer name may not match the email pattern; SaaS email patterns vary widely |
| Verify with BillionVerify | SMTP-level check with signal classification | Confirms whether the specific address is deliverable before sending |
The highest-risk step is email finder accuracy. Reviewer names on G2 are real, but the email pattern at their company may not follow a predictable format. SaaS companies — the majority of G2's listed vendors and reviewers — frequently use non-standard patterns, subdomains, or third-party email hosting that increases catch-all and unknown results.
G2-specific email quality risks.
| Company type on G2 | Email infrastructure | Finder difficulty |
|---|---|---|
| Early-stage SaaS (under 50 employees) | Often catch-all, sometimes personal domains | High — patterns unpredictable, fewer indexed addresses |
| Mid-size SaaS (50–500 employees) | Structured patterns, usually Google Workspace or Microsoft 365 | Moderate — patterns findable but not always indexed |
| Enterprise software vendor | Complex — multiple domains, regional addresses, role hierarchies | High — decision-maker email may differ from public contact |
| Reviewer is a buyer, not a vendor | Contact at a non-SaaS company | Variable — depends on their company's email setup |
| Company with multiple G2 product listings | May use product-specific subdomains | Moderate to high — domain choice for email is not obvious |
The reviewer-email mismatch is a G2-specific risk that does not appear in agency directory sourcing. On Clutch, the company you are targeting is also the company you are emailing. On G2, the reviewer may be a buyer at a company in a completely different industry with different email infrastructure — which means the verification result is less predictable until you run it.
Route each verification result before import.
| BillionVerify result | Action for G2-sourced contacts |
|---|---|
| Valid | Import into CRM or sender tool |
| Role-based | Separate segment — use messaging suited for shared inboxes |
| Catch-all | Cautious segment — lower send volume, monitor bounce rate closely |
| Invalid | Do not import — add to suppression list |
| Unknown | Route to review queue — exclude from main campaign until resolved |
| Risky or disposable | Do not import |
Catch-all results are more common in G2-sourced lists than in agency directory lists because SaaS companies disproportionately use Google Workspace and Microsoft 365 configurations that accept all mail at the domain level. A separate low-volume segment for catch-all addresses lets you test deliverability without exposing your main sender reputation.