<p></p>
<p>Probably worth to look at some mobile Bitcoin/LN/Liquid wallets or apps to see what they use. They did for sure some research regarding security as well.</p>
<p><strong>Blocksteam Green</strong> (BTC and Liquid wallet) use <a href="https://github.com/Blockstream/green_android">Java</a> and  <a href="https://github.com/Blockstream/green_ios">Swift</a>. It is based on <a href="https://github.com/blockstream/gdk">https://github.com/blockstream/gdk</a> a C++ lib with native bindings to Java and Swift. and <a href="https://github.com/blockstream/gdk">https://github.com/blockstream/gdk</a></p>
<p><strong>Aqua</strong> (Blocksteam BTC and Liquid wallet) uses <a href="https://github.com/Blockstream/aqua_ios">Swift</a> (is iOS only). Uses gdk.</p>
<p><strong>Muun</strong> (the best BTC/LN wallet from UX IMO) use <a href="https://github.com/muun/apollo">Java</a> and <a href="https://github.com/muun/falcon">Swift</a> and Go for library code.</p>
<p><strong>Breez</strong> uses <a href="https://github.com/breez/breezmobile/tree/master/android/app/src/main/java">Java</a> for Android and <a href="https://github.com/breez/breezmobile/tree/master/lib">Flutter/Dart</a> for library code and <a href="https://github.com/breez/breezmobile/blob/master/ios/">Swift</a> for iOS (iOS not publicly released yet)</p>
<p><strong>BlueWallet</strong> (BTC and LN wallet) use <a href="https://github.com/BlueWallet">React Native</a></p>
<p><strong>Zap</strong> (LN remote control for LN node) use <a href="https://github.com/LN-Zap/zap-android">Java</a> and <a href="https://github.com/LN-Zap/zap-iOS">Swift</a> but iOS is not maintained anymore.</p>
<p><strong>Sphinx</strong> (Messaging over LN) use Kotlin and Swift<br>
<a href="https://github.com/stakwork/sphinx-kotlin">https://github.com/stakwork/sphinx-kotlin</a><br>
<a href="https://github.com/stakwork/sphinx-ios/blob/master/sphinx/Managers/Tor/SphinxOnionConnector.swift">https://github.com/stakwork/sphinx-ios/blob/master/sphinx/Managers/Tor/SphinxOnionConnector.swift</a></p>
<p><strong>Zeus</strong> is built on TypeScript and React-Native. It runs on both iOS and Android. No experience with it, seems more under development.<br>
<a href="https://github.com/ZeusLN/zeus">https://github.com/ZeusLN/zeus</a></p>
<p>Any other relevant wallets/btc related apps which are cross platform?<br>
>From my collection it seems Java/Kotlin and Swift are the most used solutions. For shared library code Dart/Flutter, Go, C++ are used.</p>

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