Lefts
a domain specific language for building creative ML models
Details
- External ID
- 49209498
- Source
- HN
- Company
- —
- Product
- Lefts
- Website domain
- github.io
- Launched
- Aug. 7, 2026
- Cohort
- —
- Upvotes
- 6
- Upvotes percentile
- 0.3125
- Tags
- —
- Fetched at
- Sept. 10, 2026, 5:32 a.m.
- Updated at
- Sept. 10, 2026, 5:32 a.m.
Description
Lefts is a small domain specific language for applied machine learning modelling. It is aimed at anyone that builds predictive models for a living and wants to focus on reasoning about model behaviour and building creative architectures, and not on building train/test pipelines or worrying about data leakage.It is simple but quite powerful - I have been using it in my own work to explore new ways of modelling (check out the tutorial on geometric models!), and to breeze past the least interesting parts of being a machine learning engineer. It also has some cool functional programming going on under the hood (check out the design philosophy!).
Enrichment
- Theme
- decision model runtimes and tools
- Vertical
- Horizontal
- Function
- Dev tools
- Audience
- Developer
- AI stance
- AI-native
- Project type
- Hobby / open-source project
- Normalized one-liner
- domain specific language for machine learning models
- Manually corrected
- False
Could you build this?
Yes Lefts is a lightweight Python library providing composable functional abstractions (fit/predict wrappers) over Polars and scikit-learn compatible models, easily vibe-coded in a few days.
Discussion
No comments on this launch.
Competitors
Other products that read as similar to this one — 33 launches clear the similarity bar, closest 8 shown.
Attention rank: #24 of 34 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 265 days after the earliest competitor.
- DeepClause · hn · 2025-11-15 · 7 upvotes · similarity 0.39
- StemJSON · hn · 2026-09-14 · 8 upvotes · similarity 0.38
- jev-leftpad · github · 2026-09-21 · 85 upvotes · similarity 0.37
- Learning a Language Using Only Words You Know · hn · 2025-12-15 · 84 upvotes · similarity 0.36
- quant-models · github · 2026-09-20 · 10 upvotes · similarity 0.35
- AnyDecisionModel · github · 2026-09-21 · 9 upvotes · similarity 0.35
- janas · github · 2026-09-20 · 21 upvotes · similarity 0.35
- Mellum by JetBrains · ph · 2026-06-20 · 196 upvotes · similarity 0.34
Other launches for this product
- No other launches for this product.
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