Privacy Policy
Last updated: September 19, 2026
This policy describes the Circuit website at crunner.pages.dev. The site has no accounts. It includes Google's AdSense code for site verification and advertising setup, and uses Google Analytics 4 to measure visits and site usage. Google Analytics may use cookies and collect page URLs, referrers, and browser/device information. This integration does not send your C source code, terminal input, or program output as analytics events. See how Google uses information from sites that use its services.
Your code and program library
C source code is compiled and executed on your device in a browser Web Worker. The compiler does not upload your source, stdin, or output to a remote execution service. Saved programs and workspace information are kept in IndexedDB in your browser profile. Theme and terminal layout preferences use local storage. Terminal output is held in the current session.
Programs remain locally until you delete them or the browser clears or evicts the data. Private browsing may remove data when the session closes. Programs do not automatically sync to another device. Exported backups and downloaded C files are saved wherever you choose on your device; imported backups are read locally.
Cookies and essential storage
The workspace can set a first-party sidebar_state cookie with a seven-day lifetime when you toggle the sidebar. Browser storage supports the program library and interface preferences. These features are not advertising profiles. You can manage cookies and site storage in your browser settings; clearing them may erase programs and preferences, so export a backup first.
Hosting and connection information
Cloudflare Pages delivers the site's static files, including compiler assets. Ordinary web requests can expose your IP address, browser information, requested URL, and request time to Cloudflare for delivery, security, and service operation. These requests do not contain your program source or terminal input. Hosting records are governed by Cloudflare's processing and retention practices; this site does not promise that visiting it produces no server logs.
See Cloudflare's Privacy Policy for its practices.
Contact information you choose to send
If you contact the operator through a published contact channel, your message, reply address, and any attachments may be used to respond and investigate the issue. Do not include passwords, personal records, or confidential source code. The Contact page provides the support email address.
Messages are handled through the published Gmail inbox and its provider. Correspondence may be retained while responding to a request or keeping a necessary support record; there is no automatic deletion period implemented by this website. You can request access, correction, or deletion of information you have sent using the contact address. Applicable rights and any lawful retention obligations depend on the circumstances.
Browser libraries are isolated by site origin. A different domain, browser profile, or device has separate data. “Try in Circuit” reads a bundled example locally and adds a new copy to your library; the example link contains its name, not your source.
Google AdSense and advertising
Circuit includes the Google AdSense script for site verification and advertising setup. Loading this script makes requests to Google that can include connection and browser information. Installing the script does not mean Google has approved the site to display ads.
In an AdSense-enabled version, Google and other advertising vendors may use cookies or similar technologies to select and measure ads based on visits to this and other websites. Google's advertising cookies can allow Google and its partners to personalize ads across those visits. Other participating ad networks may use their own cookies under their policies.
You can review personalized advertising choices at Google My Ad Center and participating vendors' choices at YourAdChoices. More information is available in Google's advertising technology policy. These external settings do not indicate that Circuit currently serves ads.
Before activating advertising, applicable consent notices and controls must be provided, including an appropriate Google-certified consent management platform where required. No advertising consent is inferred from merely using the compiler.
Your choices and questions
You control your local library through the program manager, backup tools, and browser site-data settings. The operator cannot retrieve or restore code stored only in your browser. For questions about this policy or information you have sent to the operator, use the details on the Contact page. This policy may change as the website changes; the date above identifies the latest revision.