Promptloop
create, run, and improve prompt evals from the terminal
Details
- External ID
- 48325073
- Source
- HN
- Company
- —
- Product
- Promptloop
- Website domain
- github.com
- Launched
- May 29, 2026
- Cohort
- —
- Upvotes
- 13
- Upvotes percentile
- 0.654281098546042
- Tags
- —
- Fetched at
- Sept. 7, 2026, 9:26 p.m.
- Updated at
- Sept. 7, 2026, 9:26 p.m.
Description
a CLI agent for prompt evaluation loopsw
Enrichment
- Theme
- native desktop apps and utilities
- Vertical
- Horizontal
- Function
- Observability & eval
- Audience
- Developer
- AI stance
- AI-native
- Project type
- Commercial product
- Normalized one-liner
- prompt evaluation tool for developers
- Manually corrected
- False
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 — 1483 launches clear the similarity bar, closest 8 shown.
Attention rank: #496 of 1484 (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 0.66
- Jo · hn · 2026-06-05 · 10 upvotes · similarity 0.61
- Lazy-tool: reducing prompt bloat in MCP-based agent workflows · hn · 2026-03-31 · 23 upvotes · similarity 0.60
- Vehla · hn · 2026-09-13 · 5 upvotes · similarity 0.60
- Whetuu · hn · 2026-07-23 · 50 upvotes · similarity 0.59
- Tokensift, an open-sourced token-efficiency linter for LLM prompts · hn · 2026-08-29 · 6 upvotes · similarity 0.58
- ReasonGate- An explainable gate that blocks LLM prompt injection · hn · 2026-07-16 · 7 upvotes · similarity 0.57
- cline-pilot · github · 2026-09-26 · 17 upvotes · similarity 0.57
Other launches for this product
- No other launches for this product.
Same idea, different domain
Nobody's really built a observability & eval tool for Media & entertainment yet.