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co.build lists third-party projects and provides its own descriptions and setup prompts. Review instructions before running them: device changes can cause damage, data loss or security problems. Independent repair does not automatically remove statutory warranty rights, but damage caused by a modification may be excluded where law permits. Check the project, permissions and local law. Device names and logos belong to their owners; a listing does not imply their endorsement.

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Devices Mods Requests Submit a project

1
CrossPoint Reader
Better fonts, Wi-Fi book transfers and synced progress
2
calibre
Manage your ebooks and copy them to your Kindle
3
KOReader
Read EPUB, PDF and comics in a better reader

4
Kindle Comic Converter
Fit comics and manga to your e-reader screen
Amazon Kindle
Amazon Kindle
5
CrossInk
Add nicer fonts and reading stats
Xteink

Xteink

6

reMarkable Paper Pro showing a handwritten mind map in colour

rmfakecloud

Sync your notebooks through your own server

reMarkable

reMarkable

7

EinkBro

Browse the web with page turns instead of scrolling

Boox

Boox

8

Black Xteink X4 Classic showing a poster of words

TRMNL Firmware

Show Wi-Fi dashboards on supported e-paper displays

Xteink

Xteink

9

Tesserae

Turn the screen into a calendar and home dashboard

Barnes & Noble Nook

Barnes & Noble Nook

10

Black Kobo Clara Colour showing a library of book covers

NickelMenu

Add shortcuts and app launchers to Kobo's menus

Kobo

Kobo

11

Kindle Paperwhite showing a page of a book

SimpleUI

Give KOReader a home screen and quick settings

Amazon Kindle

Amazon Kindle

12

KindleEar

Get news feeds and articles delivered as ebooks

Amazon Kindle

Amazon Kindle

13

Kindle Paperwhite showing a page of a book

ZenOS

Add a home screen with widgets to KOReader

Amazon Kindle

Amazon Kindle

14

Kindle Paperwhite showing a page of a book

Project: Title

Change KOReader's covers, folders and book menus

Amazon Kindle

Amazon Kindle

15

Black Kobo Clara Colour showing a library of book covers

KoboCloud

Download books from Dropbox, Google Drive or Nextcloud

Kobo

Kobo

16

App Store for KOReader

Find and install KOReader plugins on the reader

Kobo

Kobo

17

Black Kobo Clara Colour showing a library of book covers

Assistant

Ask an AI about the book you're reading

Kobo

Kobo

18

PocketBook Era showing the first page of Alice's Adventures in Wonderland

reader.dict

Look up words offline in free Wiktionary dictionaries

PocketBook

PocketBook

19

reMarkable Paper Pro showing a handwritten mind map in colour

rmapi

Download all your files or send new ones in bulk

reMarkable

reMarkable

20

Kindle Paperwhite showing a page of a book

Home Assistant Lovelace Kindle Screensaver

Show your Home Assistant dashboard on your Kindle

Amazon Kindle

Amazon Kindle

21

WinterBreak

Jailbreak supported Kindles to install homebrew

Amazon Kindle

Amazon Kindle

22

Black Xteink X4 Classic showing a poster of words

PapyriX

Read more formats and receive files over Wi-Fi

Xteink

Xteink

23

Black Kobo Clara Colour showing a library of book covers

Bookends

Place reading info and progress bars around the page

Kobo

Kobo

24

Kindle Paperwhite showing a page of a book

KOReader Sync Server

Sync your reading position through your own server

Amazon Kindle

Amazon Kindle

25

goMarkableStream

Show your tablet's screen live in a web browser

reMarkable

reMarkable

26

reMarkable Paper Pro showing a handwritten mind map in colour

ReCalendar

Make a linked planner sized for your tablet

reMarkable

reMarkable

27

reMarkable Paper Pro showing a handwritten mind map in colour

reMarkable Mouse

Draw on your computer with the tablet's pen

reMarkable

reMarkable

28

Black Nook GlowLight 4 showing a page of a book

Magisk

Add root access and modules to supported Android devices

Barnes & Noble Nook

Barnes & Noble Nook

29

CoolReader

Read ebooks with adjustable fonts and page controls

Tolino

Tolino

30

reMarkable Paper Pro showing a handwritten mind map in colour

Goosepaper

Get a daily newspaper of your feeds on the tablet

reMarkable

reMarkable

31

Kindle Paperwhite showing a page of a book

Kindle HID Passthrough

Use Bluetooth keyboards and page-turn remotes

Amazon Kindle

Amazon Kindle

32

Readest

Read ebooks on phones, computers and e-readers

Xteink

Xteink

33

reManager

Back up, add files and install mods from a computer

reMarkable

reMarkable

34

Notable

Take handwritten notes on endless scrolling pages

Boox

Boox

35

Black Kobo Clara Colour showing a library of book covers

Cobalt

Add an app launcher and catalog to your Kobo

Kobo

Kobo

36

Black Kobo Clara Colour showing a library of book covers

KFMon

Start KOReader or other apps from a library icon

Kobo

Kobo

37

reMarkable Paper Pro showing a handwritten mind map in colour

reMarkable MCP

Let an AI assistant search and read your notebooks

reMarkable

reMarkable

38

Calibre-Web

Host your library online and send books to your reader

Amazon Kindle

Amazon Kindle

39

Kindle Paperwhite showing a page of a book

Syncthing plugin for KOReader

Sync book folders with your computer over Wi-Fi

Amazon Kindle

Amazon Kindle

40

Black Kobo Clara Colour showing a library of book covers

LocalSend for KOReader

Transfer files between KOReader and LocalSend

Kobo

Kobo

41

WordDumb

Add Word Wise and X-Ray to books you load yourself

Amazon Kindle

Amazon Kindle

42

KOReader calibre plugin

Bring KOReader progress and highlights into calibre

Amazon Kindle

Amazon Kindle

43

Black Kobo Clara Colour showing a library of book covers

wallabag

Save web articles and read them later in KOReader

Kobo

Kobo

44

Supernote Manta electronic notebook

supernote-tool

Turn notebooks into PDFs and images on your computer

Supernote

Supernote

45

OpenMTP

Copy books and files over USB from a Mac

Barnes & Noble Nook

Barnes & Noble Nook

46

Kindle Paperwhite showing a page of a book

Send2KindleBot

Send documents to your Kindle from Telegram

Amazon Kindle

Amazon Kindle

47

reMarkable Paper Pro showing a handwritten mind map in colour

Codexctl

Install a software version your mods support

reMarkable

reMarkable

48

KoShelf

See your reading stats and highlights on a web page

Kobo

Kobo

49

Syncthing-Fork

Sync Android folders with your other devices

Supernote

Supernote

50

Supernote Manta electronic notebook

Supernote (Unofficial)

Open your handwritten notebooks inside Obsidian

Supernote

Supernote

51

Black Xteink X4 Classic showing a poster of words

CrossPoint Reader Calibre Plugin

Send books from calibre to your reader over Wi-Fi

Xteink

Xteink

52

BookOrbit

Host your books and sync progress and highlights

Amazon Kindle

Amazon Kindle

53

Kindle Paperwhite showing a page of a book

Calibre-Web Automated

Import, convert and send books automatically

Amazon Kindle

Amazon Kindle

54

Kindle Paperwhite showing a page of a book

FileSync

Move books over Wi-Fi from your phone or computer

Amazon Kindle

Amazon Kindle

55

PocketBook Era showing the first page of Alice's Adventures in Wonderland

KOReader PocketBook Sync

Show KOReader progress on the PocketBook home screen

PocketBook

PocketBook

56

reMarkable Paper Pro showing a handwritten mind map in colour

Vellum

Install community apps and add-ons on the tablet

reMarkable

reMarkable

57

Black Kobo Clara Colour showing a library of book covers

Kobo Highlights Importer

Put your Kobo highlights into Obsidian notes

Kobo

Kobo

58

Kindle Paperwhite showing a page of a book

Readeck plugin for KOReader

Read your saved Readeck articles in KOReader

Amazon Kindle

Amazon Kindle

59

Komga

Read your comic library from your own server

Amazon Kindle

Amazon Kindle

60

Black Kobo Clara Colour showing a library of book covers

Grimmory

Host a library for your browser and reading devices

Kobo

Kobo

61

Librera Reader

Read EPUB, PDF and other books on Android

Boox

Boox

62

Black Xteink X4 Classic showing a poster of words

Draftling

Write on an X4 Pro or Classic with a keyboard

Xteink

Xteink

63

reMarkable Paper Pro showing a handwritten mind map in colour

XOVI

Unlock add-ons that change the built-in interface

reMarkable

reMarkable

64

Boox Rapid Draw

Get faster pen ink in other writing apps

Boox

Boox

65

AppLoad

Add an app launcher to the reMarkable interface

reMarkable

reMarkable

66

Black Kobo Clara Colour showing a library of book covers

TRMNL Kobo

Turn your Kobo into a self-updating dashboard

Kobo

Kobo

67

CrossPoint Sync

Keep your reading place on your own server

Xteink

Xteink

68

Kindle Paperwhite showing a page of a book

TRMNL Display Plugin for KOReader

Show a refreshing dashboard on your e-reader

Amazon Kindle

Amazon Kindle

69

Kindle Paperwhite showing a page of a book

Anki plugin for KOReader

Turn words you look up into Anki flashcards

Amazon Kindle

Amazon Kindle

70

Kindle Paperwhite showing a page of a book

kindle-send

Email books and web articles to your Kindle

Amazon Kindle

Amazon Kindle

71

Black Nook GlowLight 4 showing a page of a book

AnnotationSync

Sync highlights and page position between readers

Barnes & Noble Nook

Barnes & Noble Nook

72

Kindle Paperwhite showing a page of a book

Reading Notes for Kindle

Search your highlights and get them by email

Amazon Kindle

Amazon Kindle

73

Black Xteink X4 Classic showing a poster of words

XTC.js

Turn comics and PDFs into pages for your reader

Xteink

Xteink

74

Olauncher

Open the apps you install from the home screen

Barnes & Noble Nook

Barnes & Noble Nook

75

Kindle Paperwhite showing a page of a book

Kindle Mate 2

Export your highlights and words to notes or Anki

Amazon Kindle

Amazon Kindle

76

Key Mapper

Remap Android buttons to app shortcuts

Barnes & Noble Nook

Barnes & Noble Nook

77

Kindle Paperwhite showing a page of a book

Kindle Bluetooth Controller

Turn KOReader pages with a Bluetooth controller

Amazon Kindle

Amazon Kindle

78

Black Xteink X4 Classic showing a poster of words

MicroSlate

Write on your X4 with a Bluetooth keyboard

Xteink

Xteink

79

reMarkable Paper Pro showing a handwritten mind map in colour

RemarkableLamyEraser

Erase and undo with a LAMY pen's side button

reMarkable

reMarkable

80

Black Kobo Clara Colour showing a library of book covers

NickelClock

See the time and battery while you read

Kobo

Kobo

81

Black Kobo Clara Colour showing a library of book covers

Kobo Tweaks

Choose what shows above and below your page

Kobo

Kobo

82

Supernote Manta electronic notebook

Supernote Private Cloud & Knowledge Hub

Sync notebooks to your own server and search them

Supernote

Supernote

83

Black Kobo Clara Colour showing a library of book covers

Kobo Utilities

Save reading positions and edit book details from calibre

Kobo

Kobo

84

reMarkable Paper Pro showing a handwritten mind map in colour

FouzR’s XOVI extensions

Add a floating pen toolbar and new touch gestures

reMarkable

reMarkable

85

Kindle Paperwhite showing a page of a book

Weather Lockscreen

Show the weather forecast when your Kindle sleeps

Amazon Kindle

Amazon Kindle

86

Black Kobo Clara Colour showing a library of book covers

KoboPatch Web UI

Skip the Kobo account and add patches from a browser

Kobo

Kobo

87

Panels+

Read comics one panel at a time

Kobo

Kobo

88

rePub

Send web articles to your tablet from Chrome

reMarkable

reMarkable

89

Send to X4

Send web articles from your browser to the reader

Xteink

Xteink

90

Black Kobo Clara Colour showing a library of book covers

Kobalt

Use a different EPUB reader inside Kobo's library

Kobo

Kobo