The Field Notes
On forms, submissions, and the boring parts of the web.
Desk · captcha
All field notes filed under captcha.
- 01How CAPTCHA kills form conversion (and what to use instead)
CAPTCHA on every form costs signups. The conversion math, when friction is worth it, and the adaptive approach that catches spam without fire-hydrant clicks.
- 02AI spam moderation for forms: beyond regex and keyword lists
Why keyword-based spam filters fail in 2026, how AI moderation actually works under the hood, and the layered defence that still catches what models miss.
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