hopIQ found 10 beers with the same malty and clean character as Störtebeker Keller-Bier 1402. Organic unfiltered Kellerbier from Stralsund — feinherb-weich with natural yeast cloudiness and rounded malt character. Brewed in the 800-year Hanse brewing tradition of the Baltic coast. Ranked by flavour match rather than popularity.
Closest match: Bischofshof Regensburger Zwickl — 88%. No twin in the catalogue yet.
3 countriesmatched across 56 flavour tagsbest match 88%

No beer in the catalogue yet — these come closest.
Close on what matters, with one thing they do differently.
Same idea, less detail — open a beer to see the full comparison.