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On the Duo: Duo-native. Its maker's site shows the library, with a Continue Reading card above the cover grid, on the open Duo. Checked November 5, 2026.
App Store data as of October 27, 2026

Anyone reading only from a comic server should know that part sits behind the Pro unlock on top of the purchase price.
ComicFlow reads CBR, CBZ and PDF files directly, with tap zones, zoom, bookmarks, double-page spreads, vertical scrolling for webtoons and right-to-left order for manga. It converts CBR, CBZ, RAR and ZIP archives to PDF at three quality levels, exports standard CBZ files for e-readers, and organizes comics with collections, ratings, tags, reading status and ComicInfo metadata. Comics arrive through watched folders in Files or a Wi-Fi upload page. Pro connects to Komga, Kavita and OPDS servers to stream or download books, with reading position synced to the server and KOReader.
Its maker shows the library on an unfolded iPhone Duo, with a Continue Reading card above the cover grid.