Element
Matrix-based secure messaging — the open-source Slack/Discord alternative. Decentralized, self-hostable, end-to-end encrypted. Your messages are never locked in a corporate server. Because Matrix is federated, two people on different servers can talk without either joining the other's platform.

Element, as it opens in a browser tab.
Not sure how to add Element to your home screen? Step-by-step for Chrome, Safari, Firefox and Edge — it takes about ten seconds, and there is no app store involved.
Own Element? Have us re-run this measurement — we open it in a real browser, cut the network, and send you what survived.
How to install Element as a PWA
Screenshots
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Own a PWA? See the listing options — standard submission is free.