It is a log, not a shop
Letterboxd works because you rate what you watched, not what is in cinemas this Friday. A Letterboxd-for-concerts app does the same for live music: the show is the unit, not the artist’s next on-sale.
Alert apps tell you a tour is coming. A concert diary remembers that you already saw them at the Academy in 2022 and rated it four stars.
Friends, ratings, and a watched list
The useful bits of Letterboxd are ratings, reviews, and seeing which friends watched the same film. Radar mirrors that for gigs: rate the night, tag your crew, and see who else was at the same show.
The “watched list” is your timeline of past gigs. Upcoming shows sit beside them so you are not running a separate wishlist app and a Notes file.
Why Radar fits the comparison
Radar is built as a gig diary first — Find search, setlists, photos, and Concert Wrapped sit on top of nights you actually logged. That is closer to Letterboxd than to Songkick’s tour alerts.
If you have been searching “Letterboxd for concerts”, you want a personal archive you will still open in five years. Start with ten free gigs and log the last show you went to tonight.