UD5 Toolkit
ZX Spectrum Basic Emulator - Online Retro Code Playground
Write and run simple Sinclair BASIC programs in a browser-based ZX Spectrum emulator. Load demo programs and experience 80s computing. Educational fun.
Tag: Device Emulator - Browser Sim
5+ toolsResponsive Design Emulator - Online Test All Device Sizes
See your website inside iframes at multiple breakpoints simultaneously. Side‑by‑side responsive testing.
prefers‑contrast Tester - Online High/Low Contrast Emulator
Force more or less contrast and see how your page adapts. Test your CSS media queries for accessibility.
Full Page Screenshot Emulator - Online Partial Visual Capture
Simulate a full‑page screenshot by stitching screen captures (limited). Works best on simple pages. Use browser’s native capture.
Responsive Design Tester - Online Viewport Emulator
Preview any website inside emulated device viewports (iPhone, iPad, various resolutions). No screenshot, live interaction in an iframe. Local tool.