On the others NGL interface (only mobile app) look like a mashup between iOS UI code (bottom scroll for choices) and Android 4.3 theming. If think I could get something more natural using #Flutter
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Restrospring doesn't have a mobile app at all and , well who care? The website is enough indeed and responsive. And the mobile version is quite well made.
So ofc, my choice is biaised toward retrospring, the UI, the privacy features, the customization, it's something made to be ... 2/?