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Visual email automation with a simulator for tracing contact branches

A multi-platform embedded IDE with built-in compilers, a debugger and a simulator.

A browser editor for micro:bit projects with Blocks, JavaScript, Python, and a device simulator.

Compare camera images in original and simulated colour-vision views.

Inspect a full-screen colour-vision simulation across applications.

IELTS practice and lessons with writing samples, vocabulary exercises and a speaking simulator.

A maintained HP-42S calculator simulator

Run manual and automated mobile-app tests against selected cloud or team-managed devices.

A proxy-based API simulator that records traffic for repeatable tests without calling the real service each time.

Compare portfolio risks and test allocation changes before making them

Describe mobile and web UI journeys as YAML flows and run them on a real or virtual target.

Run gray-box end-to-end tests against React Native apps on iOS and Android.

Read colour-coded charts with pixel names, highlighting and filtered views.

Apple's Mac IDE for building, testing, debugging, and distributing apps for Apple platforms.

Spending budgets and automatic saving alongside US checking accounts

Free online tool to try 60+ hairstyles and 19 colors on your photo.

Solana protocol explorer with a free transaction-message simulator

A Microchip-focused IDE for organizing firmware projects, building target code and debugging microcontrollers.

Steady-state chemical flowsheet calculations

Learn an interview approach, rehearse it and review delivery

Preview colour-vision differences through a screen filter or phone camera.