Allegrow

Allegrow is a B2B email verification and deliverability platform for sales teams. It focuses on contacts that basic verifiers cannot resolve, namely addresses on catch-all domains and mailboxes behind secure email gateways, and charges for accurate results rather than unknowns.

Instead of guessing or scraping public sources, Allegrow uses a signal-based system to assess each contact on a catch-all domain, identifying which addresses are safe to send to and which are inactive or risky. Around verification, it adds deliverability features: monitoring of your sending mailboxes and content tests that check messages against spam filters before you send. Higher plans include unlimited verification and native integrations with HubSpot, Outreach and Salesloft, so contacts can be checked inside the tools reps already use.

Allegrow is aimed at B2B sales teams running outbound at scale, where the cost of bounces and burned domains outweighs the price of a premium verifier.

There is a 14-day free trial for up to 1,000 contacts. The Starter plan costs $99 a month for 5,000 verified contacts and one monitored mailbox, and the Scale Plus Unlimited plan costs $1,340 a month.