Promptloop
create, run, and improve prompt evals from the terminal
Get picks like this daily. Today's launch numbers, the top launches, AI and tech news, and a daily opportunity pick, straight to your inbox.
Want to reach these readers? Sponsor an issue.
a CLI agent for prompt evaluation loopsw
HN · launched May 29, 2026 · 13 upvotes (top 35%) · 0 views
Niche: llm evaluation and deployment tools · 77 launches, 0 in the last 7 days · Explore this niche →
Category and tags
- Horizontal
- Observability & eval
- Developer
- AI-native
- Commercial product
Visit website ↗ Source listing ↗
More like this: all 77 launches in llm evaluation and deployment tools →
Could you build this?
Yes It is a CLI tool that runs evaluation test cases against LLM APIs and outputs prompt performance metrics, which is easily assembled with standard scripting.
Discussion
3 comments analyzed.
Competitors mentioned: Superpowers (skill suites for brainstorming)
Concerns raised: Lack of specification in prompts leads LLMs astray, Unclear positioning relative to existing skill tools
Feature requests: Iterative prompt refinement with light model in harness, Chat integration for quick access, Auto-generate requirements, guidelines, and explanations from brief prompts
Competitors
Other products that read as similar to this one : 3715 launches clear the similarity bar, closest 8 shown.
Attention rank: #1265 of 3716 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 211 days after the earliest competitor.
- openeval · github · 2026-09-11 · 68 upvotes · similarity 0.68
- Jo · hn · 2026-06-05 · 10 upvotes · similarity 0.63
- Harness Tuner · hn · 2026-11-13 · 5 upvotes · similarity 0.62
- Lazy-tool: reducing prompt bloat in MCP-based agent workflows · hn · 2026-03-31 · 23 upvotes · similarity 0.62
- Vehla · hn · 2026-09-13 · 5 upvotes · similarity 0.62
- Whetuu · hn · 2026-07-23 · 50 upvotes · similarity 0.61
- cli-style · github · 2026-10-14 · 19 upvotes · similarity 0.61
- binnacle · github · 2026-11-05 · 79 upvotes · similarity 0.60
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.