LEGAL

Privacy policy

Last updated: 18 October 2026

Who is responsible

Fretster is an independent project based in Spain. Its developer is the controller of your data. Contact: victor.suarez.ferrer@gmail.com.

What data we process

Your practice: tempos (BPM), sessions and exercises completed, ratings, notes, goals, monthly check-ins and streaks. They are stored on your device and, if you sign in, also in your account so they sync across devices.

Your account: if you sign in with Google, we receive your name, email address and profile photo. We do not store passwords.

Recordings: if you record a take, the microphone is only used while you record. The audio stays on your device and is never uploaded; your account only keeps its length and your ratings.

Academies: if you join a teacher's academy, that teacher can see your practice activity and progress (sessions, tempos, ratings and assignments). Teachers who connect Google Calendar authorise us to create and read their lesson events.

Analytics (only if you accept): Google Analytics records pages visited and actions such as starting or finishing a practice or installing the app, so we know what to improve. We also use Vercel Web Analytics, which counts visits in aggregate and without cookies.

Errors: when something breaks we may receive a technical report (browser, page and error) so we can fix it.

Why, and on what legal basis

Providing the service (showing your progress, syncing your data, the teacher portal): necessary to give you what you ask for when you use the app.

Usage analytics: only with your consent. You can change it at any time under "Cookies" at the bottom of every page.

Error reports and security: our legitimate interest in keeping the app working and safe.

We do not sell or rent your data, or use it for advertising.

Cookies and local storage

Necessary (no consent needed): your browser's local storage keeps your practice, your preferences and your Google sign-in.

Analytics (consent needed): Google Analytics sets cookies (_ga) only if you press "Accept". If you reject, it never starts and we delete those cookies.

Who else processes your data

Google (Firebase: sign-in, database and Google Analytics), Vercel (web hosting and cookieless analytics) and, when enabled, Sentry (error reports). Some of these providers may process data outside the EU with the safeguards the GDPR requires, such as standard contractual clauses.

How long we keep it

Account data until you delete your account. Data on your device until you clear the site's data. Analytics data for the retention period set in Google Analytics.

Your rights

You can access, correct, delete, object to, restrict and take away your data. From the menu you can export it as JSON and delete your account with all its data.

For anything else write to victor.suarez.ferrer@gmail.com. If you think we have mishandled your data, you can complain to the Spanish Data Protection Agency (aepd.es) or your local authority.

Children

If you are under 14, you need a parent or guardian's permission to create an account.

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Legal & disclaimers

Educational Reference: Fretster is a personal-study and reference resource for guitar tones, chords, and song references. All content is provided for educational and personal-practice purposes and is offered “as is”, without warranty of any kind.

Chord & Tab Disclaimer: Chord charts, progressions, lyrics excerpts, and lead-sheet timings shown here are interpretive practice references transcribed by ear or compiled from public community sources. They may contain mistakes, simplifications, or incorrect timings, and they are not official transcriptions. Full credit for every composition belongs to its songwriters, performers, publishers, and rights holders.

Copyright & Trademark Notice: All song titles, lyrics, artist and band names, album titles, amplifier and gear model names (including Yamaha®, THR™, and any other manufacturer marks), logos, and related intellectual property referenced herein are the property of their respective copyright holders, trademark owners, and rights holders. Their use here is purely nominative — to identify songs, sounds, and equipment for educational discussion — and does not imply any endorsement, sponsorship, affiliation, or partnership. No copyright or trademark infringement is intended. If you are a rights holder and want material removed or corrected, contact victor.suarez.ferrer@gmail.com.

Tone Presets & Settings: Amplifier preset values are approximations of well-known recorded tones, derived from public community spreadsheets, interviews, and personal ear-matching. They are not factory presets, are not endorsed by any amplifier manufacturer, and individual results will vary based on guitar, pickups, room, and signal chain.

Embedded Media: YouTube videos, lyrics, and any third-party content displayed inside this app are streamed or linked directly from their original platforms. They remain subject to the terms of service and copyright of those platforms and their respective owners.

Privacy: Practice progress, BPM history, and session feedback are stored in your browser (localStorage) and, when you sign in, in your private Firebase® account document. No personal practice data is shared publicly or sold.