Instantly campaigns with icebreakers that don't smell automated
Instantly's deliverability is wasted on 'I came across your profile'. Feed it a real icebreaker column instead — generated in your browser with your own AI key.
Credit-based icebreakers punish scale
Per-lead AI credits mean your personalization bill grows with every campaign. BYO-key means it basically doesn't.
Generic openers burn domains
Low reply rate plus spam complaints hurt sender reputation. Specific first lines are the cheapest deliverability investment there is.
Agencies juggle many client voices
Tone presets keep the SaaS client direct and the creative agency witty without rewriting prompts.
How it works
Take the CSV you're about to upload to Instantly
Run it through ColdOpen with your OpenAI or Anthropic key
Upload the result to Instantly — first_line arrives as a custom variable
Use {{first_line}} as the opening sentence of your sequence
Example output
Lena Fischer · Quietdesk · quietdesk.co
“Quietdesk selling focus rooms by the hour reads like the first coworking pitch built for people who hate coworking.”
Common questions
Is this affiliated with Instantly?
No — ColdOpen is an independent tool that produces a CSV any sender, including Instantly, can consume.
What models does it use?
Your key, your choice of provider: OpenAI (gpt-4o-mini) or Anthropic (Claude Haiku). Both cost fractions of a cent per line.
What does it cost?
First 10 lines free, then $19 once for unlimited. You bring your own OpenAI or Anthropic key, which stays in your browser and costs you fractions of a cent per line.
Run your next list through it
10 free lines, no signup, two minutes end to end.