CROSSMELV
EN ID

Licenses and attribution.

CrossMelv stands on other people’s work. Here is whose, and under which terms.

Firmware

CrossMelvMIT LicenseModifications to CrossInk, under the same license as upstream.
CrossInkMIT LicenseBy uxjulia. Fonts, reading stats, Focus Reading, library and much more.
CrossPoint ReaderMIT LicenseCopyright (c) 2025 Dave Allie and the CrossPoint Reader organization.
FreeInk SDKMIT LicenseCopyright (c) 2026 FreeInk. Based in part on the OpenX4 E-Paper Community SDK (MIT); e-paper driver work credited to CidVonHighwind.
wolfSSLGPLv3TLS library, Arduino-wolfSSL 5.7.2. Because the binary links it, the release binary is distributed under GPLv3.
NimBLE-ArduinoApache License 2.0Bluetooth LE stack for page-turner support.
Arduino-ESP32, ESP-IDF (pioarduino)Apache 2.0, LGPL 2.1Platform and framework.
ArduinoJson, QRCode, expat, miniz, uzlibMIT, zlibParsing, QR codes, compression.
PNGdec, JPEGDECApache License 2.0Image decoding, by Larry Bank.
Tabler IconsMIT LicenseSource of the on-device icons.

The full license texts ship in the source tarball (LICENSE, freeink-sdk/NOTICE, and each library’s own files). The GPLv3 text is at gnu.org/licenses/gpl-3.0.

Dictionary pack

English-IndonesiaCC BY-SA 3.0FreeDict project, created automatically by WikDict (Karl Bartel) from Wiktionary data via DBnary. Shared under the same license.
English WordNetWordNet LicenseWordNet 3.1, Copyright 2011 Princeton University. Converted to StarDict format with PyGlossary. License.

Each dictionary folder in the pack includes its full LICENSE.txt.

This website

Lexend DecaSIL Open Font License 1.1The Lexend project. On the reader and on this site.
BitterSIL Open Font License 1.1Huerta Tipográfica. On the reader and on this site.
InterSIL Open Font License 1.1Rasmus Andersson. On the reader and on this site.
fflateMIT LicenseCopyright (c) 2023 Arjun Barrett. Unzips and zips books inside the EPUB Chapter Fixer, in your browser. License text.

Screenshots come from the CrossMelv simulator and the reader’s web companion. Book text and covers in them are public domain (Fitzgerald, Melville, Stoker, Marcus Aurelius); the news article and its byline are sample content.

CrossMelv is unofficial. It is not affiliated with, endorsed by or supported by Xteink. Xteink and X4 Pro are names of their owner, used only to say which device this firmware is for.

The software is provided “as is”, without warranty of any kind. Installing custom firmware is at your own risk.