Privacy Policy
Chartwave privacy policy for visitors and users.
This page explains, in practical terms, what data Chartwave uses to generate charts and how that data is handled in the current version of the product.
Last updated: May 7, 2026
Overview
Chartwave is a web tool that generates music visualizations from publicly available Last.fm listening data. This privacy page explains what information Chartwave uses, what it does with that information, and what visitors should understand before using the site.
Last.fm usernames and listening data
When you use Chartwave, you may enter a Last.fm username. Chartwave uses that username to request public listening data from the Last.fm API and related public Last.fm pages. That may include top tracks, top artists, top albums, weekly chart information, and publicly available artwork or artist images. Chartwave does not ask for your Last.fm password.
Generated chart content
The charts, album quilts, and exported images produced by Chartwave are generated from the public listening data associated with the username you provide. If you enter another person’s public Last.fm username, Chartwave will attempt to generate results based on that public profile data.
Contact submissions
The current contact form opens a draft in the visitor’s own email application. Messages are not stored in a Chartwave database by the website itself during that process. If you choose to send an email, your message is then handled by your email provider and the inbox that receives it.
Analytics, logs, and hosting
Chartwave is hosted on Vercel and uses Vercel Analytics, Vercel Speed Insights, and Google Analytics to understand traffic patterns and site performance. The hosting provider and analytics services may collect standard technical data such as IP address, browser details, request logs, page views, and performance information for security, reliability, measurement, and debugging.
Cookies
Chartwave does not use account-login cookies for core functionality, but the site and its third-party services may still use cookies, local storage, and similar browser technologies for analytics, performance measurement, security, and site delivery. Those technologies may be set by Google Analytics, Vercel, or advertising providers if advertising is enabled on the site.
Advertising and Google AdSense
Chartwave may display advertising through Google AdSense or other advertising partners. Third-party vendors, including Google, may use cookies or similar technologies to serve ads based on a visitor’s prior visits to this site or other sites. Google’s use of advertising cookies enables it and its partners to serve ads based on browsing activity. Visitors can learn more about how Google uses information from sites and apps, review ad settings, or opt out of personalized advertising through Google’s Ads Settings and similar industry opt-out tools.
Consent and visitor choices
Where required by law or platform policy, Chartwave may present a consent message or privacy choice flow before using advertising-related cookies or measurement technologies. Visitors in regions such as the European Economic Area, the United Kingdom, or Switzerland may be shown additional consent controls for advertising and data processing. Visitors can also manage certain ad preferences through Google’s Ads Settings, browser controls, or industry opt-out pages such as aboutads.info.
Third-party services
Chartwave depends on third-party services, including Last.fm, to retrieve listening data and some artwork. If you interact with external links or use services outside Chartwave, those services may apply their own privacy practices and terms.
Data retention
Chartwave is designed to generate results on demand rather than maintain a permanent user account system. If the site later begins storing submitted data, saved charts, analytics records, or support requests in a persistent way, this page should be revised to explain retention periods more specifically.
Children’s privacy
Chartwave is intended for a general audience and is not knowingly designed to collect personal information from children. If you believe personal data has been submitted in a way that should be removed, use the contact page to request review.
Policy updates
This privacy policy may be updated as Chartwave changes. If the app adds stored accounts, backend contact processing, advertising, or more extensive third-party tracking, the policy should be revised to reflect those changes.