> ## Documentation Index > Fetch the complete documentation index at: https://docs.apifycloud.io/llms.txt > Use this file to discover all available pages before exploring further. # Browser & device support > Supported browsers and platforms for the Click to Call widget Click to Call is built on standards-based real-time voice technology and runs in modern web browsers on phones, tablets, and computers. Visitors do not need to install anything. ## Supported browsers The widget is officially supported on the latest stable release of: * Google Chrome * Microsoft Edge * Mozilla Firefox * Safari Both desktop and mobile versions of these browsers are covered. Older releases may work but are not officially tested. ## Supported operating systems * **Mobile** — iOS and iPadOS on iPhone and iPad, Android on phones and tablets * **Desktop** — macOS, Windows, and Linux On iOS and iPadOS, every browser is built on Safari's engine and therefore behaves identically for voice calls. ## Requirements for your website If you embed the widget on your own site, the page must be served over a secure connection. This is a rule enforced by every modern browser for any feature that accesses a microphone — not something specific to Click to Call. If you share the widget as a direct link instead of embedding it, no setup on your side is required. ## Microphone access When a visitor starts their first call, their browser asks permission to use the microphone. Granting it is a one-time action per browser and site. If the visitor declines, the widget clearly explains how to re-enable access from their browser settings. Some devices also restrict microphone access at the operating system level — managed phones, corporate laptops — in which case the visitor must adjust their system privacy settings to allow the browser to use the microphone. ## What's next What visitors' and agents' networks need for reliable calls. Diagnose and resolve the most common issues.