r3
Agent artifacts. Understand what's built, Steer what's next.
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r3 helps you review coding agent artifacts: HTML pages, Markdown docs, and code diffs. See what's built, comment on any element, passage, or line, and send it back to the agent to steer the next revision. Runs locally, open source, works with any agent.
PH · launched Oct 31, 2026 · 2 upvotes (top 22%) · 0 views
Niche: ai agent observability platforms · 220 launches, 7 in the last 7 days ▼ -42% · Explore this niche →
Category and tags
- Horizontal
- Dev tools
- Developer
- AI-native
- Commercial product
- Open Source
- Developer Tools
- Vibe coding
Visit website ↗ Source listing ↗
More like this: all 220 launches in ai agent observability platforms →
Could you build this?
Yes The product renders HTML, Markdown, and diffs, adds element-level comments, and passes feedback back to a coding agent. This is a local web app with a file watcher and a simple agent interface.
Competitors
Other products that read as similar to this one : 828 launches clear the similarity bar, closest 8 shown.
Attention rank: #233 of 829 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 361 days after the earliest competitor.
- R3 · hn · 2026-07-10 · 5 upvotes · similarity 0.55
- Ax-check.com · hn · 2026-09-17 · 37 upvotes · similarity 0.49
- AgentEdit · ph · 2026-09-08 · 2 upvotes · similarity 0.49
- Brain Scanner · ph · 2026-09-08 · 2 upvotes · similarity 0.48
- ars · ph · 2026-10-27 · 1 upvotes · similarity 0.48
- Claude Code Review · ph · 2026-03-10 · 539 upvotes · similarity 0.48
- REA - Reverse Engineer Anything · ph · 2026-10-10 · 1 upvotes · similarity 0.46
- Meta-agent: self-improving agent harnesses from live traces · hn · 2026-04-06 · 14 upvotes · similarity 0.46
The niche, labels, vibe code rating and competitor comparison on this page are analysis by Nicheloom. If you use them, please credit nicheloom.com. How you may use our data.