Readest vs ReadEra: a phone reader or a reader everywhere?
ReadEra is one of the most popular ebook readers on Android, and it earned that position honestly. The free app has no ads, asks for no account, finds the books already on your phone, and opens almost anything you throw at it, from EPUB and PDF to DjVu, Word documents, and comic archives. For many people it is the first reader they install and the last one they need.
Readest starts from a different premise. It treats a personal library as something that should follow you across iPhone, iPad, Android, Windows, macOS, Linux, and the web, with the same interface, annotations, and reading position on each. The useful question is therefore where you read, and how much of your reading life happens away from the phone.
Last verified: October 1, 2026, against Readest 0.12.10 and ReadEra's official website, Google Play listings for ReadEra and ReadEra Premium, and its App Store listing (iOS version 1.2.3).
Readest vs ReadEra feature comparison
| Capability | Readest | ReadEra |
|---|---|---|
| Primary focus | Cross-platform library and deep reading | Offline mobile reader and document organizer |
| Android | Native app, including Android e-ink devices | Free app (Android 4.1+); separate paid Premium app (Android 6.0+) |
| iPhone and iPad | Native app | Free app (iOS 15+); no Premium edition |
| Windows, macOS, Linux | Native desktop apps | No |
| Web reader | Yes | No |
| Reflowable formats | EPUB, MOBI/AZW/AZW3, FB2, TXT, Markdown | EPUB, MOBI/AZW3, FB2, TXT; Markdown in recent Premium builds |
| Office documents | No | DOC, DOCX, RTF, ODT |
| Fixed-page formats | PDF, CBZ/ZIP, fixed-layout EPUB | PDF, DjVu, CBZ, CBR |
| Other files | — | CHM; books inside ZIP and RAR archives |
| Finding books | Import files or a folder; optionally read a folder in place | Scans the device automatically; files are never copied |
| Library organization | Groups, authors, series, reading status, multi-key sorting | To Read, Have Read, Favorites, authors, series, collections |
| Duplicates | Refuses duplicate imports by content hash | Detects duplicate files |
| Metadata and file management | Edit metadata without modifying the file | Premium: rename, move, copy, delete files; edit metadata |
| Typography | Fonts, custom fonts, themes, margins, columns, custom CSS, vertical text | Font, size, weight, spacing, hyphenation, alignment, indents; custom fonts listed as Premium |
| PDF and DjVu tools | Text selection, highlighting, lookup, zoom, themes; no DjVu | Margin cropping, zoom, single-column mode for scanned two-page spreads |
| Annotations | Highlights, underlines, notes, excerpts, bookmarks | Quotes with notes, bookmarks, book reviews; extra highlight colors in Premium |
| Annotation export | Markdown, plain text, or JSON per book | No export format described officially |
| Text to speech | Built in on every platform, with cloud and on-device voices | Built in; background playback with the screen locked is Premium on Android |
| Translation and lookup | Built-in translators, dictionaries, Wikipedia, Word Lens | Hands the selection to a dictionary or translator app installed on the device |
| Two documents at once | Parallel Read side by side, with optional synced scrolling | Split-screen reading of two documents |
| OPDS and calibre | OPDS catalogs, calibre and calibre-web | Not mentioned in official materials |
| Sync | Readest Cloud; WebDAV, Google Drive, OneDrive, iCloud, S3 on paid tiers | Google Drive, in the paid Android Premium app only |
| Moving between them | Imports ReadEra highlights, notes, bookmarks, and position from a backup | No import from Readest described |
| Account | Optional; needed for cloud sync | None; no registration |
| Source code | Open source, AGPL-3.0 | Proprietary app; GPL rendering engines (OpenReadEra) available on request |
| Price | Free; optional paid plans and one-time packs | Free; Premium is a one-time $14.99 on Google Play (US price) |
Where ReadEra is the better choice
Zero setup on an Android phone
ReadEra's strongest feature is how little it asks of you. Install it and it scans the phone, sorts what it finds into authors, series, and lists, and leaves every file exactly where it was. There is no account to create and no import step to understand. Its official site makes "no ads" and "no registration" central promises, and the Play listing says the free app has no in-app purchases. Its privacy policy says it collects only anonymous crash and usage statistics, which can be switched off.
Readest can also read a folder in place, and an account is optional, but its library is built around importing books and, if you choose, syncing them. If everything you read already lives in a phone's Downloads folder and will stay there, ReadEra's model is simpler.
Documents as well as books
ReadEra opens Word documents (DOC and DOCX), RTF, ODT, DjVu, CHM, and CBR comic archives, and it reads books straight out of ZIP and RAR files. Readest supports none of those formats today. For a reader whose library mixes novels with work documents, scanned DjVu textbooks, and comics, ReadEra handles more of it without conversion.
Its fixed-page tools are aimed at the same audience. PDF margin cropping and a single-column mode that splits a scanned two-page spread into separate pages make old scans far more readable on a narrow phone screen. Readest's PDF support covers selection, highlighting, lookup, zoom, and themes, but it has no DjVu support and no equivalent spread-splitting mode.
File management on the device
ReadEra Premium can rename, move, copy, and delete book files and edit their metadata from inside the reader, and the free app already flags duplicate files. That makes it a practical way to tidy a phone's book folders. Readest edits metadata in its own records and never modifies the file itself, which is safer for a synced library but means it is not a file manager.
Where Readest is the better choice
One library beyond the phone
ReadEra runs on Android and, more recently, on iPhone and iPad. It has no desktop or web version. Readest runs natively on iOS, iPadOS, Android, Windows, macOS, and Linux, and it has a full browser reader. A book imported on a laptop is the same book, with the same highlights and position, on a phone or tablet.
ReadEra's sync is also narrower. Google Drive sync of books, progress, bookmarks, and quotes is a feature of the paid Android Premium app, and the App Store listing describes no Premium edition for iOS. With a free account, Readest syncs through Readest Cloud. On Plus or Pro, or with the one-time Full Customization pack, you can sync through storage you control instead: WebDAV, Google Drive, OneDrive, iCloud Drive, or an S3-compatible bucket. The sync documentation explains what each path carries.
Built-in study tools
ReadEra keeps its reader lean and hands lookups to whatever dictionary or translator app is installed on the device. On iOS it uses the system Translate app. Readest builds these tools in: multiple translation providers, offline dictionary bundles, Wikipedia lookup, translation of a passage, a page, or a whole book, and Word Lens hints above unfamiliar words. Its text to speech works on every platform, with Edge neural voices online and system voices on iOS and Android, and it highlights the text as it reads.
Both apps can show two documents at once. Readest's Parallel Read is designed for study, with optional synchronized scrolling for a translation beside its original or two editions checked line by line.
Annotations you can take with you
ReadEra lets you highlight quotes, attach notes, add bookmarks, and write reviews, and Premium gathers them in one section. Its official materials do not describe an export format. Readest exports a book's annotations as Markdown, plain text, or JSON. The Markdown layout drops straight into an Obsidian vault, and highlights can also go to Readwise. The reading docs cover the export options.
Open source and open catalogs
ReadEra's app is proprietary. Its terms grant a limited license and forbid decompiling, although the project publishes its GPL rendering engines as OpenReadEra on request. Readest is fully open source under the AGPL. It also connects to OPDS catalogs and to calibre or calibre-web servers, which ReadEra's official materials do not mention at all.
Moving from ReadEra to Readest
You don't have to give up years of ReadEra highlights to try Readest. Readest 0.12.8 added an importer for ReadEra backups:
- In ReadEra, create a backup. It is saved as a
ReadEra-….bakfile. - Import the book itself into Readest. A ReadEra backup holds your reading data, not the book files.
- Open the book in Readest and choose Book Menu → Import Annotations → ReadEra.
- Select the backup file. Readest finds the matching book by title and author, falling back to the file's checksum, and brings in its highlights, notes, bookmarks, and reading position.
The import works one book at a time, and highlight colors are mapped onto Readest's five-color palette, so two passages you marked differently stay different. If Readest cannot find a book in the backup, it says so rather than guessing.
Which should you choose?
Choose ReadEra if you read on an Android phone, want something that works the moment it is installed, and need DjVu, Word documents, CHM, or CBR alongside your books. It is polished, free of ads, and asks nothing of you.
Choose Readest if your reading moves between a phone, a tablet, and a computer, or if you want built-in translation and dictionaries, annotations you can export, sync through storage you control, and an open-source reader that connects to OPDS and calibre.
The two can also overlap for a while. Keep ReadEra for office documents and scans, read your EPUB library in Readest, and bring your old ReadEra highlights across book by book as you go.
Sources and verification
ReadEra claims were checked against the official ReadEra website, its Premium page, privacy policy, terms, and OpenReadEra page, together with the official Google Play listings for ReadEra and ReadEra Premium and the App Store listing. Prices and minimum OS versions are as shown on those listings and may vary by region. Readest claims were checked against the Readest docs and the Readest 0.12.10 release. The ReadEra importer shipped in Readest 0.12.8.
Frequently asked questions
- Is Readest a good alternative to ReadEra?
- It is when your reading spans more than an Android phone. Readest runs on iOS, Android, Windows, macOS, Linux, and the web with one synced library, built-in translation and dictionaries, and exportable annotations. ReadEra remains simpler for a phone-only library and opens more document formats.
- Can I move my ReadEra highlights to Readest?
- Yes. Since version 0.12.8, Readest imports highlights, notes, bookmarks, and reading position from a ReadEra backup file. Import the book into Readest, open it, and choose Book Menu, then Import Annotations, then ReadEra.
- Which app supports more formats, Readest or ReadEra?
- ReadEra does. Besides EPUB, PDF, MOBI, AZW3, FB2, CBZ, and TXT, which both apps open, ReadEra also reads DjVu, DOC, DOCX, RTF, ODT, CHM, CBR, and books inside ZIP or RAR archives.
- Are Readest and ReadEra free?
- Both are free to use. ReadEra Premium is a separate one-time purchase on Android that adds Google Drive sync and other features. Readest is open source, with optional paid plans and one-time packs for extra cloud storage and features.