Bike Sensor Emulator vs HeaderX

Turn your iPhone or iPad into a Bluetooth Low Energy cycling sensor — no hardware required. Bike Sensor Emulator advertises as a standard Cycling Speed and Cadence (CSCS) peripheral. Any app or bike computer that supports the Bluetooth SIG CSCS specification can connect and receive simulated data. SIMULATION MODES Random (default) — cadence follows a natural random walk centered around 90 rpm, with speed derived automatically. Manual — set speed (0–50 mph) and cadence (0–200 rpm) in real time using on-screen sliders. FEATURES • Configure speed, cadence, or both before each session • Advertises the standard Bluetooth SIG CSCS service • Accepts one BLE connection at a time • On iPhone and iPad, continues broadcasting while the app runs in the background • Graceful error handling for Bluetooth unavailability and permission denials • Runs on iPhone and iPad; the iPad app also runs on Apple Silicon Mac Ideal for developers building cycling apps, QA teams verifying BLE sensor integrations, cyclists evaluating CSCS-compatible apps before purchasing a sensor, and anyone who needs a controllable CSCS signal without dedicated hardware.

HeaderX injects custom HTTP request headers into your Safari browsing session — the essential companion for web developers, API testers, and QA engineers. Point HeaderX at your development environment, define your headers once, and flip them on whenever you need them. No proxy setup, no configuration files, no leaving the browser. DEFINE HEADERS AS JSON Describe your headers in a simple JSON editor — paste an entire set at once: {"X-Debug-Mode": "enabled", "Authorization": "Bearer dev-token"} Or use the array format to keep headers saved but individually switched off. TWO VIEWS, ONE TOGGLE Edit as raw JSON or flip to List view, where every header gets its own checkbox. The master toggle in the corner turns everything on or off instantly — your configuration stays saved either way. REUSABLE PROFILES Save named header sets — one per project, environment, or test scenario — and switch between them in two clicks. FEATURES • One-tap master toggle • JSON editor and checkbox list views • Per-header enable/disable • Named profiles for quick switching • Settings persist across browser restarts • Works in Private Browsing (optional) GOOD TO KNOW Standard header names (Authorization, Accept-Language, User-Agent, and other HTTP-spec headers) are applied to all requests through Safari's native rule engine. Custom header names (X-My-Header and similar) are applied to fetch and XHR requests made by web pages — a Safari platform constraint on custom names in network rules. For typical API-debugging workflows, this covers exactly the requests you care about. Headers apply to every site while the toggle is on — remember to switch off when you're done testing, especially with authentication headers. PRIVACY FIRST Everything stays on your device. HeaderX collects no data, phones home to no one, and contains no analytics. What you configure is nobody's business but yours.