Indie and open source alternatives to Instantly.

Cold email and LinkedIn prospecting with unlimited sending and warmup

Best for Budget multichannel outreach for freelancers and small teams

emelia.io ↗From $37/mo; 7-day free trial

Mail merge and cold email campaigns inside Gmail

Best for Gmail users who want campaigns and follow-ups without leaving the inbox

gmass.co ↗From $29.95/mo; free trial

Find and verify B2B emails and send cold email sequences

Best for Finding verified emails and running simple outreach sequences

hunter.io ↗Free plan; paid from $49/mo

Privacy-focused mail merge and follow-ups from Gmail and Sheets

Best for Solo founders sending personal cold emails from their own Gmail

mailmeteor.com ↗Free plan; paid from $5.99/user/mo

Email warmup and spam testing for cold email deliverability

Best for Keeping cold email inboxes out of spam

mailreach.co ↗Paid; priced per mailbox

Simple cold email automation with warmup and a phone dialer

Best for Small sales teams starting a cold outreach program

mailshake.com ↗From $29/mo

Cold email and LinkedIn outreach with unlimited senders and users

Best for Small teams and agencies that don't want per-seat pricing

quickmail.com ↗From $49/mo; 14-day free trial

Cold email sequences with built-in B2B lead finder and warm-up

Best for Teams that want leads and cold email in one tool

saleshandy.com ↗From $41/mo ($34/mo billed yearly)

Cold email outreach with unlimited mailboxes and built-in warmup

Best for Agencies sending high-volume cold email across many inboxes

smartlead.ai ↗From $39/mo

Cold email and LinkedIn outreach with free warm-up and verification

Best for B2B teams that want safe sending and unlimited email accounts

woodpecker.co ↗From $35/mo; 14-day free trial

Open source cold email campaigns and mailbox warmup you can self-host

Best for Teams that want to own their cold email stack on their own server

warmbly.com ↗GitHub ↗Free (self-host)

Self-hosted open source cold email outreach

Best for Teams wanting a self-hosted Instantly-style outreach tool

github.com ↗GitHub ↗Free, self-hosted