Feature / 07
Email Subject Swipe Library
Paste subject lines you see in the wild — auto-classify hook, emotion, and length.
How it works
Every operator has a Notion graveyard of half-saved swipe-file links. ADSTRO replaces it with a searchable swipe library where every subject is auto-classified the moment you paste it. We extract hook type (urgency, curiosity, social-proof, benefit, fear, contrarian, list, question, personalised), dominant emotion, and length bucket — so when you're writing the next launch email you can filter the library by exactly the angle you want to test.
See it in your dashboard
Key highlights
What makes this different
Auto-classify every paste in ~1s via LLM
Hook type + emotion + length bucket on every row
Filter and search across hundreds of subject lines
Build a swipe file that's searchable, not a graveyard