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ChessMate · Legal

Open-source licenses

Effective
November 5, 2026
Last updated
November 5, 2026
On this page

In plain English

ChessMate is built with open-source software and uses puzzle data from Lichess. This page lists every component in the release app with its license and links to the full license texts. The same notices ship inside the App.

1.About this page

ChessMate: Chess AI & 2 Player is made by KidsPro World LLC. The list below has 215 components and comes from the release build. Each open-source component is licensed under its own terms, which apply to it instead of the ChessMate Terms of Service where they differ.

2.Puzzle data

Puzzles come from the Lichess puzzle database (database.lichess.org), released under Creative Commons CC0 1.0 Universal, a public domain dedication. They were selected and trimmed for ChessMate.

3.Full license texts

Read all 1,609 license texts on one long page (about 1.4 MB).

4.Components

ComponentLicense
_fe_analyzer_sharedBSD-3-Clause
abseil-cppApache-2.0, BSD-3-Clause
accessibilityBSD-3-Clause
aiBSD-3-Clause
analyzerBSD-3-Clause
angleApache-2.0, BSD-3-Clause, MIT
ansicolorApache-2.0
archiveMIT
argsBSD-3-Clause
asyncBSD-3-Clause
audioplayersMIT
audioplayers_androidMIT
audioplayers_darwinMIT
audioplayers_linuxMIT
audioplayers_platform_interfaceMIT
audioplayers_webMIT
audioplayers_windowsMIT
benchmarkApache-2.0
blocMIT
bloc_testMIT
boolean_selectorBSD-3-Clause
boringsslApache-2.0
brotliBSD-3-Clause, MIT
cevalMIT
charactersBSD-3-Clause
checked_yamlBSD-3-Clause
ChessMate (this app)Proprietary (KidsPro World LLC)
cli_configBSD-3-Clause
cli_utilBSD-3-Clause
clockApache-2.0
collectionBSD-3-Clause
convertBSD-3-Clause
coverageBSD-3-Clause
cpu_featuresApache-2.0, BSD-2-Clause
cross_fileBSD-3-Clause
cryptoBSD-3-Clause
csslibBSD-3-Clause
dartApache-2.0, BSD-3-Clause, MIT
dawnBSD-3-Clause
devtoolsBSD-3-Clause
diff_match_patchApache-2.0
double-conversionBSD-3-Clause
equatableMIT
etc1Apache-2.0
etc_decoderMIT
expatBSD-3-Clause, MIT
fake_asyncApache-2.0
ffiBSD-3-Clause
ffi_leak_trackerBSD-3-Clause
ffx_spdMIT
fiatApache-2.0
fileBSD-3-Clause
fixnumBSD-3-Clause
flatbuffersApache-2.0
flutterBSD-3-Clause, MIT, Public domain
flutter_blocMIT
flutter_launcher_iconsMIT
flutter_lintsBSD-3-Clause
flutter_native_splashMIT
flutter_svgMIT
freetype2MIT, Other (see text), Public domain, zlib
frontend_server_clientBSD-3-Clause
fuchsia_sdkApache-2.0, BSD-2-Clause, MIT
glfwApache-2.0, MIT, zlib
globBSD-3-Clause
glslangApache-2.0, BSD-2-Clause, BSD-3-Clause, MIT
go_routerBSD-3-Clause
gtest-parallelApache-2.0
harfbuzzBSD-3-Clause, ISC, MIT, Other (see text)
hive_ceApache-2.0
htmlMIT
httpBSD-3-Clause
http_multi_serverBSD-3-Clause
http_parserBSD-3-Clause
hydrated_blocMIT
icuBSD-3-Clause, MIT, Other (see text), Unicode
imageMIT
in_app_purchaseBSD-3-Clause
in_app_purchase_androidBSD-3-Clause
in_app_purchase_platform_interfaceBSD-3-Clause
in_app_purchase_storekitBSD-3-Clause
in_app_reviewMIT
in_app_review_platform_interfaceMIT
includeMIT, Other (see text), zlib
injaMIT
intlBSD-3-Clause
ioBSD-3-Clause
isolate_channelBSD-3-Clause
jniBSD-3-Clause
jni_flutterBSD-3-Clause
jni_utilBSD-3-Clause
jsonApache-2.0, MIT, Other (see text)
json_annotationBSD-3-Clause
khronosMIT
leak_trackerBSD-3-Clause
leak_tracker_flutter_testingBSD-3-Clause
leak_tracker_testingBSD-3-Clause
libcxxApache-2.0, MIT
libcxxabiApache-2.0, MIT
libjpeg-turboBSD-3-Clause, Other (see text), zlib
libjxlBSD-3-Clause
libpngBSD-3-Clause, zlib
libtess2MIT, zlib
libwebpBSD-3-Clause
libXNVCtrlMIT
Lichess puzzle dataCC0 1.0
lintsBSD-3-Clause
llvm_libcApache-2.0, MIT
loggingBSD-3-Clause
lunarg-vulkantoolsApache-2.0
matcherBSD-3-Clause
material_color_utilitiesApache-2.0
metaBSD-3-Clause
mimeBSD-3-Clause
mocktailMIT
nestedMIT
node_preambleBSD-3-Clause, MIT
package_configBSD-3-Clause
pathBSD-3-Clause
path_parsingMIT
path_providerBSD-3-Clause
path_provider_androidBSD-3-Clause
path_provider_foundationBSD-3-Clause
path_provider_linuxBSD-3-Clause
path_provider_platform_interfaceBSD-3-Clause
path_provider_windowsBSD-3-Clause
perfettoApache-2.0, BSD-3-Clause
petitparserMIT
platformBSD-3-Clause
plugin_platform_interfaceBSD-3-Clause
poolBSD-3-Clause
posixMIT
processBSD-3-Clause
process_runnerBSD-3-Clause
providerMIT
pub_semverBSD-3-Clause
rapidjsonMIT, Other (see text)
re2BSD-3-Clause, Other (see text)
shadercApache-2.0
share_plusBSD-3-Clause
share_plus_platform_interfaceBSD-3-Clause
shared_preferencesBSD-3-Clause
shared_preferences_androidBSD-3-Clause
shared_preferences_foundationBSD-3-Clause
shared_preferences_linuxBSD-3-Clause
shared_preferences_platform_interfaceBSD-3-Clause
shared_preferences_webBSD-3-Clause
shared_preferences_windowsBSD-3-Clause
shelfBSD-3-Clause
shelf_packages_handlerBSD-3-Clause
shelf_staticBSD-3-Clause
shelf_web_socketBSD-3-Clause
skiaApache-2.0, BSD-3-Clause, MIT, Other (see text)
Sora (font)SIL Open Font License 1.1
source_map_stack_traceBSD-3-Clause
source_mapsBSD-3-Clause
source_spanBSD-3-Clause
spirv-crossApache-2.0, MIT
spirv-toolsApache-2.0, MIT
spring_animationBSD-3-Clause, MIT
sqlitePublic domain
stack_traceBSD-3-Clause
stream_channelBSD-3-Clause
string_scannerBSD-3-Clause
swiftshaderApache-2.0, BSD-2-Clause, MIT
sync_httpBSD-3-Clause
synchronizedMIT
term_glyphBSD-3-Clause
testBSD-3-Clause
test_apiBSD-3-Clause
test_coreBSD-3-Clause
test_shadersMIT
tonicBSD-3-Clause
typed_dataBSD-3-Clause
universal_ioApache-2.0
url_launcherBSD-3-Clause
url_launcher_androidBSD-3-Clause
url_launcher_iosBSD-3-Clause
url_launcher_linuxBSD-3-Clause
url_launcher_macosBSD-3-Clause
url_launcher_platform_interfaceBSD-3-Clause
url_launcher_webBSD-3-Clause
url_launcher_windowsBSD-3-Clause
uuidMIT
vector_graphicsBSD-3-Clause
vector_graphics_codecBSD-3-Clause
vector_graphics_compilerBSD-3-Clause
vector_mathBSD-3-Clause
vm_serviceBSD-3-Clause
volkMIT
vulkanApache-2.0, BSD-3-Clause
vulkan-depsBSD-3-Clause
vulkan-headersApache-2.0
vulkan-toolsApache-2.0
vulkan-utility-librariesApache-2.0
vulkan-validation-layersApache-2.0, BSD-2-Clause, MIT
vulkan_memory_allocatorMIT
watcherBSD-3-Clause
webBSD-3-Clause
web_locale_keymapMIT
web_socketBSD-3-Clause
web_socket_channelBSD-3-Clause
web_test_fontsBSD-3-Clause
webdriverApache-2.0
webkit_inspection_protocolBSD-3-Clause
win32BSD-3-Clause
wuffsApache-2.0
wycheproof_testvectorsApache-2.0
xdg_directoriesBSD-3-Clause
xmlMIT
xxhashBSD-2-Clause, BSD-3-Clause
yamlMIT
yapfApache-2.0
yapf_diffApache-2.0
zlibBSD-3-Clause, Other (see text), zlib

5.Contact us

Questions about these licenses? Get in touch.

Contact us

Questions? We’re happy to help.

Company
KidsPro World LLC
Mailing address
30 N Gould St Ste R, Sheridan, WY 82801, USA

Please put “ChessMate Licenses” in the subject line. We usually reply within 24-48 hours and answer formal data-rights requests within 30 days.