New tools added regularly

tools.dave.engineer

A library of handy utilities made by Dave Hulbert. Lightweight, fast, and privacy-friendly by default. No accounts, tracking, or ads. Just useful utilities. More info.

Contribute ideas or code on GitHub.

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Explore the collection

Handy converters, debuggers, and tiny experiments.

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Showing all 43 tools

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AI

1 tool

Vision Story Studio

Classify an image then craft a narrative.

Browser

3 tools

Device & Browser Info

Display current device and browser details
Local Storage Viewer

Inspect and manage browser localStorage
Origin Private File System Viewer

Browse and manage Origin Private File System

Conversion

6 tools

2D Size Comparator

Visualize and compare rectangular dimensions with overlays.
CSV ⇄ Markdown Table Converter

Convert tables between CSV and Markdown
Lux to ANSI Throw Converter

Estimate projector throw from lux readings
OpenSCAD to STL

Compile OpenSCAD designs into STL files.
Running Pace Planner

Plan running pace, splits, and finish time
Speed Unit Converter

Convert speed units instantly

Developer

8 tools

Cerebras LLM Inference

Chat with Cerebras models via the built-in proxy worker
DNS Lookup

Query DNS records using Cloudflare's resolver
DuckDB Playground

Run DuckDB SQL in browser
GitHub Device Login

Start the GitHub device flow and store the resulting access token locally.
JSON Formatter

Format and validate JSON data
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Prompt to Web Page

Turn a short idea into a rendered web page
TensorFlow.js Linear Fit Lab

Train a tiny regression demo.
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Tool Calling Demo

Watch Cerebras tool calls unfold

Encoding

3 tools

Basic QR Code Generator

Generate QR codes from text
Morse Code to Text

Tap or hold to transcribe Morse code into plain text
QR Code Reader

Upload QR code image and extract text/URL

Learning

1 tool

Times Tables Trainer

Practice multiplication with spaced repetition

Measurement

5 tools

Ambient Noise Profiler

Real-time ambient frequency visualizer
Bubble Level

Simple digital bubble level
Compass

Heading indicator with magnetometer data
Counter

Shared counter with a Cloudflare KV-backed increment button.
Interval Timer

Customisable HIIT-style session timer

Text

7 tools

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Bible Verse Explorer

Browse NET Bible passages by book and chapter.
Markdown to HTML Converter

Convert Markdown content into HTML
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Regex Playground

Experiment with regular expressions and sample strings
Rich Text to Markdown Converter

Paste formatted content and copy the Markdown result
Scratch Pad

Quick notes with local storage
Text Case Converter

Quickly change text letter casing
Word & Character Count

Count words and characters instantly

Visualization

9 tools

3D Game of Life

Explore animated voxel life simulation
Color Name Lab

Generate fresh names for colors
Fractal Playground

Interactive Mandelbrot and Julia explorer
GBFS Explorer

Browse shared mobility feeds on an interactive map
Map Explorer

Full screen map with geolocation button
Map Overlay Aligner

Align custom map images with basemap
Pendulum Studio

Interactive single, double, and triple pendulum playground.
Perspective Grid Designer

Interactive vanishing-point grid generator
Venn Diagram Creator

Build customizable Venn diagrams with adjustable overlaps and styling.