I built an open-source, local-first alternative to LangSmith
Details
- External ID
- 48063206
- Source
- HN
- Company
- —
- Product
- I built an open-source, local-first alternative to LangSmith
- Website domain
- pypi.org
- Launched
- May 8, 2026
- Cohort
- —
- Upvotes
- 6
- Upvotes percentile
- 0.3053311793214863
- Tags
- —
- Fetched at
- Sept. 7, 2026, 9:26 p.m.
- Updated at
- Sept. 7, 2026, 9:26 p.m.
Description
Hey HN. Built this because LangSmith needs a cloud account just to see my own traces.pip install opensmith — everything shows up at localhost:7823. SQLite. No accounts.No config. Fully offline.800+ downloads in 2 days. Surprised me.Would love honest feedback from this community.
Enrichment
- Theme
- self-hosted infrastructure and security tools
- Vertical
- Horizontal
- Function
- Model & infra
- Audience
- Developer
- AI stance
- AI-native
- Project type
- Hobby / open-source project
- Normalized one-liner
- langsmith alternative for local development
- Manually corrected
- False
Could you build this?
Yes It is a Python package wrapping function calls with a decorator, persisting metadata to a local SQLite database, and serving a local web UI via an embedded web server.
Discussion
1 comment analyzed.
Competitors mentioned: LangSmith
Concerns raised: requires cloud account for trace viewing
Competitors
Other products that read as similar to this one — 29 launches clear the similarity bar, closest 8 shown.
Attention rank: #17 of 30 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 172 days after the earliest competitor.
- NixOS on Hetzner with OpenClaw in 15 Minutes · hn · 2026-06-13 · 5 upvotes · similarity 0.39
- Aurion OS, A 1.8MB OS with a browser, try it live (C/x86 ASM) · hn · 2026-04-03 · 5 upvotes · similarity 0.37
- 22 GB of Hacker News in SQLite · hn · 2025-12-30 · 730 upvotes · similarity 0.36
- Stelvio · hn · 2026-02-02 · 31 upvotes · similarity 0.36
- Sourcewizard · hn · 2025-11-29 · 5 upvotes · similarity 0.36
- I can't write Python. It works anyway · hn · 2026-04-18 · 9 upvotes · similarity 0.35
- Full graphical desktop running on a 128MB VPS Alpine+XRDP+WindowMaker · hn · 2026-03-26 · 9 upvotes · similarity 0.35
- Cloudstic · hn · 2026-03-03 · 5 upvotes · similarity 0.34
Other launches for this product
- No other launches for this product.
Same idea, different domain
Nobody's really built a model & infra tool for Fintech yet.