Key takeaways
- ByDefault ($99/mo Starter) tracks AI crawler fetches and model answers well but writes zero articles until you upgrade to Growth ($249/mo), and it has no Perplexity coverage yet.
- Otterly.AI is cheap to start ($29/mo) but gates Claude, Gemini, and Google AI Mode behind paid add-ons on every tier, and its content layer stops at audits and recommendations rather than publishing.
- Promptwatch includes every major model at $95/mo, pairs crawler logs with a whole-site content gap index, and ships Content Agents that draft and publish directly to Webflow, Framer, or WordPress.
- "Closing the loop" means three things working together: knowing what's broken (tracking), knowing what to fix (content gap analysis against your actual pages), and someone or something actually fixing it (publishing). Only one of these three platforms does all three without manual handoff.
- If you're choosing on price alone, Otterly wins for a solo operator checking a handful of prompts. If you want the gap found and the fix shipped, Promptwatch and ByDefault are the real contenders, and Promptwatch currently covers more models for less money.
Why "closing the loop" is the question that actually matters now
Every AI visibility vendor will tell you they track your brand across ChatGPT, Perplexity, Gemini, and whatever else launched last month. Fine. That part of the category is basically solved. The harder question, and the one that actually separates these tools in 2026, is what happens after the dashboard tells you your brand didn't show up for a comparison prompt.
Does the tool just flag it and leave you to write the fix yourself? Does it tell you which page needs updating? Does it draft the page? Does it publish it? That chain, tracking, diagnosis, fix, republish, is what I mean by "closing the loop," and it's the framing I used to dig into ByDefault, Promptwatch, and Otterly.AI this month.
This matters more than it sounds. Promptwatch's own data on ChatGPT shows that comparison prompts (