Tsumino
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Tsumino’s reading interface is one of the cleaner ones in this category. Pages load quickly, the reader works on phones, and works are organised by tags that cover both content type and the source series, which helps fans of specific franchises find fan-made doujinshi. English-translated titles make up a large part of the catalogue.
Free to read without registration. The site has been consistently available for several years, which puts it ahead of some newer alternatives that come and go. Occasional maintenance downtime is the main caveat.