Upload your lead list. Get AI-written first lines that reference each prospect's company. More replies, less time writing.
No credit card required for free credits.
Trusted by outbound teams
Three steps. No prompt engineering required.
Drop a spreadsheet with first_name, last_name, title, company, email. Up to 5,000 leads at once.
Claude researches each company and writes a unique, relevant first sentence for every lead.
Get your list back with a new first_line column. Drop it into your email tool.
Real examples of generated first lines.
Jason Kim · Acme Corp · acmecorp.com
"Noticed Acme just launched your Series B and expanded into enterprise logistics — congrats on the growth, that's a tough market to crack this fast."
Sarah Reyes · BuildFast · buildfast.io
"I've been following BuildFast's approach to no-code deployment pipelines — the way you've simplified what used to take a DevOps team is genuinely impressive."
Marcus Thompson · Zenflow · zenflow.com
"Your team's focus on async-first work culture at Zenflow caught my eye — it's rare to see a company walk the talk on remote collaboration the way you do."
1 credit = 1 personalized first line. Credits never expire.
For individuals testing outbound
For active outbound teams
For high-volume agencies
All plans start with 25 free credits. No contracts.
Join teams using FirstLine to scale their cold email without sounding like a robot.
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