Yes to all three, and here is the short version. Muzify is a free music-quiz website. You do not need an account to play. Nothing is for sale, so no payment details are ever collected. There is nothing to install — it runs in a browser tab.
Yes, and not in the "free tier" sense. There is no paid plan, no subscription, and no checkout anywhere on the site. Every one of the 88,000+ artist quizzes is open, as is the daily song.
Not to play. Signing in exists for three things only: saving your scores, keeping a streak, and appearing on an artist's leaderboard. You can play every quiz on the site without ever creating one — open a guess-the-song round and start.
It is a web page, not a download, so there is no installer and no permissions to grant. Because nothing is sold, no card or billing details are collected at any point. What is handled, and why, is set out in the privacy policy and the terms.
Check it rather than take a claim for it. The Recognition Index publishes what the site actually observes — 493,980 distinct visitors over a 36-day window, with every artist ranked by measured demand and the counting method stated on the page. Artist leaderboards are public. None of it requires an account to read.
The game is naming songs from five-second clips. There is no chat between players and no user-generated text anywhere in a round, so the usual concerns about open messaging do not apply. Songs come from mainstream catalogues, which means titles and lyrics are whatever the artist released — if that matters for a younger player, pick the artist deliberately from the directory rather than using a random round.
It does not sell anything, does not take payment details, does not require an account to play, and is not an app you install. If you have seen a page claiming otherwise about Muzify, it is not this site.