
Practice TypeScript
Stop watching tutorials. Start practicing TypeScript
What it does
I built TS Quiz to help developers test their real TypeScript skills. • 125 questions • 5 difficulty levels (Basic to Advanced) • Strong focus on React + TypeScript • AI that analyzes your results and gives personalized feedback No login required. Covers generics, conditional types, mapped types, hooks, and more. Would love your honest feedback! → https://www.ts-quiz.com/
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- TDTSDiagram – Diagrams as Code with TypeScript2023 · tsdiagram.com · ▲130
Made an online tool for creating diagrams with TypeScript. I quite like it for thinking about how to shape my data, even if I end up using a different language in the end.
More dev tools this month
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The first open-source price index for GPU compute
Dev tools · 10d ago · getcomputable.com

OpenTrailPaper is open-source bike computer firmware for the LilyGO T5S3 4.7" E-Paper PRO. It supports offline maps, GPX routes, FIT recording and Bluetooth sensors.
Dev tools · 2d ago · opentrailpaper.com

Open-source GTM skills for technical founders
Dev tools · 29d ago · gtmcofounder.com
Launched alongside, May 2026
the whole month →

Parallel agents, diff reviewer, and multi-model comparisons
Dev tools · May 2026 · kilo.ai


- NW
Hey HN, Henry here from Cactus. We open-sourced Needle, a 26M parameter function-calling (tool use) model. It runs at 6000 tok/s prefill and 1200 tok/s decode on consumer devices. We were always frustrated by the little effort made towards building agentic models that run on budget phones, so we conducted investigations that led to an observation: agentic experiences are built upon tool calling, and massive models are overkill for it. Tool calling is fundamentally retrieval-and-assembly (match query to tool name, extract argument values, emit JSON), not reasoning. Cross-attention…
Life & fun · May 2026 · github.com
- FM
Dev tools · May 2026 · github.com