Whitespace.
See who already built your idea — and the space they left open.

CLUSTER BOOK-FORMATS-MANY · 4 ENTRIES · EARLIEST ENTRY 2014-02-16

Multi-format ebook readers

This cluster consists of ebook reader apps that support multiple file formats, cloud sync, text-to-speech, note-taking, and customization. The dated entries are sparse, with a few appearing in 2014-2015, a long gap, and then a few more in 2023-2025. Traction leaders are Readest, ZenReader, and Booklover, each with an activity signal of 0 stars.

Entry timeline

ENTRY TIMELINE

FEB 2014: 1MAR 2014: 1JAN 2023: 1JUN 2025: 1
FEB 2014JUN 2025

Each bar is the month a member carries, which is a creation date where the source published one and a crawl date otherwise. Nothing in the index was found before 11 August 2026, and coverage broadened sharply on 14–15 August, so a bar from then on reports how much we found that month, not how much was built; an earlier bar reports how far back a member's own source dated it — not how long we have been watching.

Members by activity

Activity signals, not revenue.

Build origin · 1 hand-coded · 3 unlabelled

Operator · 3 commercial · 1 unlabelled

Two labels per entry, never collapsed into one: how it was built, and who stands behind it. Counted over the 4 listed below. Unlabelled means nothing has decided yet — not that the answer is small.

  1. 01ZenReader - Read ebooks easily0★21 dayslivecommercialEbook reader app that supports multiple formats, note-taking, text-to-speech, and document organization with privacy features.
  2. 02PocketBook Reader0★1 molivecommercialE-book and audiobook reader app supporting many formats with cloud sync, text-to-speech, and note-taking.
  3. 03ReadLre - Book Reader & Notes0★1 yrabandonedliveE-book reader app supporting many formats with customizable themes, auto-scrolling, text-to-speech, notes, and iCloud sync.
  4. 04TotalReader - ePub, DjVu, MOBI, FB2 Reader0★9 yrabandonedlivehand-codedcommercialDocument and ebook reader app that supports many book, document, and office file formats, with cloud storage integration and text-to-speech.

Ranked by traction, highest first, and paged 20 at a time — this is a window on the cluster, never the whole of it. Ties are broken by a stable id so a product cannot appear on two pages or fall between them. Browse every cluster.