Developer utilities

IoT platform with an API, cloud storage and mobile apps for building and controlling devices.

Prefix-based proxy that adds CORS headers so browser code can reach other HTTPS APIs.

• No sign-up

Collection of browser-based developer utilities with autosave.

Crawler that finds broken links across a website.

C# metaprogramming framework that injects repetitive code at compile time through reusable aspects.

• For open source

Hosted orchestration for data pipelines and workflows with serverless execution.

API for posting or scheduling content on 10 social networks, also usable from AI agents over MCP.

Domain and URL redirect management with HTTPS on redirected hosts.

Redirect service with its own nameservers, edge delivery, HTTPS, link monitoring and a REST API.

Domain redirects with automatic SSL, path forwarding and click analytics.

Data migration platform that turns CSV uploads into API-fed jobs with quarantine and alerts.

Embeddable WYSIWYG rich text editor for web apps, delivered from the cloud.

Gamification APIs plus open-source UI pieces for streaks, points, badges and leaderboards.

Java and TypeScript web UI framework with components, a design system and tooling.

Personal RSS feeds that announce new versions of languages, libraries and tools.

Open-source platform that turns Python and TypeScript scripts into workflows and internal apps.

• Open source

Lookup that checks whether a username already has profiles on 90+ social networks.

Cloud snippet manager for storing and sharing code with yourself or a team.

Paste service for code and binaries, shareable as a link or rendered image.

Snippet manager for storing and labelling code in over 100 languages.

Snippet manager for saving, organising and sharing code, plus a code screenshot maker.

Browser tool that diffs two JSON documents and highlights changes.

Lookup tool showing how a page or site's Core Web Vitals scores changed over time.

Browser tool for encoding, decoding, encrypting and analysing data through chained operations.

• Open source

Browser tool that compares two text or code snippets and highlights what changed.

Interactive tester for writing glob patterns, with learning material.

• No sign-up

Lookup tool showing the host, ASN, ISP and location of a domain or IP, plus DNS utilities.

Endpoint that echoes the caller's public IP address in a choice of formats.

Browser tool that renders JSON data as an editable, shareable table view.

Privacy-respecting QR code generator that does not track or collect data.

Checker that shows your exit IP as seen from several global nodes, handy for split-DNS setups.

Visualiser that turns MySQL EXPLAIN output into a readable plan for tuning slow queries.

Name checker that looks up whether a project name is taken on GitHub, npm, domains and other services.

Alerts by email, Slack, Discord or webhook when tracked repos and packages publish new versions.

Checks whether a site is reachable from China by comparing DNS answers and ASNs from both sides.

Pastebin that encrypts content in the browser with JavaScript.

Pastebin with syntax highlighting, multi-tab pastes, client-side encryption and an API.

QR code generator with scan tracking, bulk creation and brand styling, without ads.

API that renders charts and QR codes as images to embed in pages.

Converter that generates typed models and serializers from JSON, JSON Schema or GraphQL.

• No sign-up

Hosted manager for HTTP redirect rules used for SEO and marketing sites.

Downloadable sample media, document and archive files for QA work.

Badge service generating SVG status badges for READMEs, such as build, version and coverage.

Real-time feed hub using PubSubHubbub, with feed export and analytics.

Generator for UUID v1/v4/v7, GUID, CUID, NanoID and ULID identifiers.

• No sign-up

QR code maker with custom colours and logos, aimed at vouchers, gift cards and promotions.

Editor plugins that log your coding time and show dashboards of languages and projects.

Open-source terminal app for macOS and Linux that renders content inline and keeps session history.

• Open source

Collection of online network and server diagnostic tools.

Lookup for your public IPv4/IPv6 address and request details, with an API in several formats.