Codon ChartSequence data
Pasted sequences and opened FASTA files are processed in this browser. This site does not send their contents, filenames or calculated results to an application server. Sequence text is not added to URLs. The tool does not save sequence projects in local storage; closing or reloading the page clears the current input. Downloaded sequences, charts, text reports and CSV results are saved by your browser to your device.
Website delivery
Cloudflare serves the site and necessarily receives ordinary connection information such as IP addresses, request paths and browser headers to deliver and protect the service. The site does not load advertising or remote font services. Page analytics is described below. Fonts and application scripts are served from this domain. Hosting security and access processing are distinct from sequence processing, which happens locally.
Chart links can include the selected NCBI genetic-code table number and RNA/DNA alphabet so the next reference uses the same settings. These two choices may remain in your browser history and are received with the page request. Lookup text, codons and sequences are not added to these links. The tool does not save these settings in browser storage, and page analytics and tool events omit them.
Anonymous diagnostics and tool counts
We use Cloudflare Analytics Engine to count public-page visits, tool loading, successful lookups or calculations, rejected inputs, and export requests or failures. Each tool outcome is counted at most once per page visit. We also record page-speed measurements and fixed error categories to find broken controls. These records contain the public page path, country, device category, whether the request appears automated, and application build version. Page-visit counts also note the domain of the website that linked to the page (if your browser shares one) and a broad source category taken from it or the link's campaign source tag, such as a named search engine or AI assistant. For the slowest response on a page, speed measurements note how the delay divided between waiting, running and redrawing, whether it followed a tap, click or key press, and the broad kind of control involved, such as a button or link. In browsers that report it, they also note whose script ran longest during that response (this site's, a browser extension's or another site's), how it was started, and how the time divided between scripts, page layout and drawing, never the script's address or name. For page loading, they also note how the wait divided between connecting, the server's reply and fetching and drawing the largest image or text, whether that was text or an image, when the largest layout movement happened, and whether the page was opened fresh, reloaded, returned to or loaded in advance. They use no visitor identifier or tracking cookie.
We do not send sequence text, file contents or names, input values, calculation results, clipboard contents, error messages or stack traces with these events. Export counts record a request or completed clipboard operation, not proof that a file was saved. Automated tests are excluded from ordinary reports.
Hosting diagnostics
Cloudflare keeps sampled request and error logs for up to seven days to help diagnose server failures. These hosting logs can include requested page paths and ordinary request metadata; query strings, including the two chart-link settings described above, are removed. They are separate from the anonymous tool counts described above; sequence and lookup text are not added to them.
Google Analytics
We use Google Analytics 4 to understand page visits and whether a visit used a tool: the first lookup or calculation result on a page sends it one fixed tool_used event with the page path, never what you entered or the result. It may set first-party _ga cookies to recognize repeat visits. Google receives the page path, page title, limited campaign tags, the referrer's origin, and ordinary browser and connection information, including your IP address and the approximate location our hosting provider works out from it (country, region, city and approximate coordinates). Our server passes that location on because these requests reach Google through this website. Automatic enhanced measurement and advertising features are disabled. We do not send tool inputs, file names, sequences, calculations or simulated scene settings to Google Analytics. Event-level data is retained for 14 months; aggregate reports may remain available longer. See Google's Privacy Policy.
Google Analytics does not load for visitors in the EEA, UK, Switzerland or Quebec, when location is unknown, or when the browser sends Global Privacy Control. Automated and synthetic test traffic is excluded. You can remove analytics cookies through your browser's site-data controls.
Links and shared devices
Following an external source link opens a different website with its own policies. Downloads remain on your device until you remove them. On a shared computer, clear the input and manage downloaded files according to your own data-handling needs.
If you email us, your address and message are used only to reply.
Contact: hello@codonchart.com.
Last updated October 4, 2026.
Links to stores and services
When a page links to another company's product, the link goes through an address that begins with /go/. When you follow one, our server redirects you to that site and counts the click, the same way as a page view: which link, the page it was on and roughly how long after the page opened, but no identifier for you. Once we join a company's affiliate program, the redirect adds that program's referral code, so the company can credit a purchase or sign-up to us; its own privacy policy then applies.