Lefts
a domain specific language for building creative ML models
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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!).
HN · launched Aug 7, 2026 · 6 upvotes (top 69%) · 0 views
Niche: programming languages and interpreters · 161 launches, 2 in the last 7 days ▼ -75% · Explore this niche →
Category and tags
- Horizontal
- Dev tools
- Developer
- AI-native
- Hobby / open-source project
Visit website ↗ Source listing ↗
More like this: all 161 launches in programming languages and interpreters →
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 : 74 launches clear the similarity bar, closest 8 shown.
Attention rank: #55 of 75 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 280 days after the earliest competitor.
- DeepClause · hn · 2025-11-15 · 7 upvotes · similarity 0.41
- StemJSON · hn · 2026-09-14 · 8 upvotes · similarity 0.40
- jev-leftpad · github · 2026-09-21 · 85 upvotes · similarity 0.38
- llm-legislativo · github · 2026-10-13 · 386 upvotes · similarity 0.38
- Learning a Language Using Only Words You Know · hn · 2025-12-15 · 84 upvotes · similarity 0.37
- janas · github · 2026-09-20 · 21 upvotes · similarity 0.37
- AnyDecisionModel · github · 2026-09-21 · 9 upvotes · similarity 0.37
- LLM Unboxed · ph · 2026-10-20 · 2 upvotes · similarity 0.37
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.