New 1A SimpleChat App. Simple, fast, secure. Made in Switzerland. Depending on your device and environment you can chat over a distance for about 20 meters or even more without Wi-Fi / WLAN. Also within a closed room or house or in a bunker. Actually I never tested the chat within a bunker, but I think it could work. Read more here.
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New 1A SimpleChat App that works offline with Bluetooth