This is a heavily interactive web application, and JavaScript is required. Simple HTML interfaces are possible, but that is not what this is.
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Tact
justtact.com
did:plc:yvrgbklb2vkqt6e4vamkhlqf
Tact is a simple chat app for iOS, iPadOS and macOS. It uses your iCloud account, and stores all chats and messages in iCloud. Tact is great for couples, families, and groups of friends who already know each other in real life. https://justtact.com