Instantly
Stands out: Warmup, unibox, and volume send with hosted MCP and a public API.
Watch out: Deliverability still depends on your domains and inboxes, not the tool alone.
Not the right fit for
- Teams that only need LinkedIn messaging
- Buyers looking for an ATS
SendKit
Stands out: Dedicated IPs plus warmup and a sequencer in one $99/mo listing, so you are not buying Mailforge mailboxes and Instantly on two bills.
Watch out: $99/mo is above Instantly ($47/mo) and Smartlead ($39/mo). Confirm how many inboxes and IPs the floor includes before you call it cheaper infra.
Not the right fit for
- Users who only need Gmail merge
- LinkedIn-first teams that do not send cold email