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An Instantly alternative for personal, researched cold email
Instantly is built for sending cold email at volume across many warmed mailboxes. KnockB does the opposite on purpose: a few researched emails a day to local businesses, from your own mailbox, each one approved by you.
Side by side
KnockB and Instantly
What Instantly does well
- Sending at scale across many connected mailboxes, with warm-up and inbox rotation.
- A/Z testing, conditional sequences and a shared inbox for replies.
- A large B2B lead database you can search by job title and company.
- An AI reply agent that can run with human approval or on autopilot.
Where KnockB is different
- Few, personal emails: each one is built around a specific, sourced detail from the business's own website.
- Local businesses found from open map data, rather than a job-title database.
- Your real work mailbox, not a set of outreach domains. Sending stays slow and in business hours.
- Approval first by default, for every first email, follow-up and reply.
At a glance
How they compare
| KnockB | Instantly | |
|---|---|---|
| Best for | Personal outreach to local businesses | Cold email at volume |
| Where prospects come from | Open map data and each business's own website | Instantly's B2B lead database, or your own lists |
| Research per prospect | Website signals and one sourced detail, visible in a research browser | AI personalization from lead data |
| Mailboxes | Your own Google Workspace mailbox | Many connected mailboxes, with warm-up and rotation |
| Volume | A few a day, in business hours | Built for high volume |
| Testing | Not yet | A/Z tests and conditional sequences |
| Replies | Research brief and a drafted answer you approve | AI reply agent, approve-first or autopilot |
Fair is fair
When Instantly is the better choice
- You want to send at high volume across many mailboxes and domains.
- You need A/B testing and complex sequences today.
- You prospect by job title at companies of every size, or run many client campaigns as an outbound agency.
FAQ
Questions people ask
Because each one is researched and approved, and it comes from your real mailbox. A few personal emails a day protect your domain and read like a note from you, not a campaign.
Instantly is a trademark of its owner. KnockB isn't affiliated with Instantly. Details about Instantly come from its public website and help pages, checked in October 2026; features change, so check theirs for the latest.
See how KnockB works or other comparisons.
Knock on every business in your town.
Early access is open to a small number of agencies. Tell us what you sell and where.