Free online developer tools

7 tools

Small utilities developers reach for daily: JSON and YAML formatters, Base64 and URL encoders, regex testers, JWT decoders, diff viewers and cron helpers. Prefer tools marked as running in your browser when you paste tokens, keys or production data, because nothing is uploaded.

Showing 1–7 of 7

0.823score
Llama Coder
Nutlope
Describe an app idea and an open model generates a runnable code project with a preview.
ArtifactAINo sign-up★ 7.1Kdeveloper tools
0.816score
make real
tldraw
Draw a user interface on a canvas and a vision model turns it into working HTML; uses your own API key.
ArtifactAINo sign-up★ 5.4Kdeveloper tools
0.803score
database.build
Supabase community
Postgres running in the browser through PGlite, paired with an AI assistant for schemas, CSV imports and diagrams.
ArtifactAINo sign-upIn-browser★ 2.9Kdeveloper tools
0.784score
Napkins.dev
Nutlope
Upload a wireframe or design screenshot and get a React and Tailwind app generated from it.
ArtifactAINo sign-up★ 1.5Kdeveloper tools
0.730score
WebNN Samples
W3C Web Machine Learning community
Sample apps and an expression playground for the WebNN API, which runs neural networks on device hardware from the browser.
ArtifactAINo sign-upIn-browser★ 188developer tools
0.698score
Helpercraft
Helpercraft
Helps you build an Agent Skill (SKILL.md) by choosing a job, rules and a personality.
ArtifactAI★ 108developer tools
0.602score
Agent Architecture
TheJacksonCode
A visual designer for laying out multi-agent systems for Claude Code.
ArtifactAI★ 110developer tools