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.
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