Signal

Choose Slack if…

• you need searchable channel history across projects
• you rely on dozens of third‑party integrations
• you want cross‑company Slack Connect channels
• you need quick audio huddles for spontaneous calls
• you can budget for paid plans to lift message limits

Choose Telegram if…

• you need instant access to chats on any device without
• you run a community with hundreds of thousands of members
• you want to automate interactions with bots and custom APIs
• you prefer a freemium model with optional premium features

Choose WhatsApp if…

• you need to reach contacts who only use WhatsApp
• you want built‑in business messaging tools
• you rely on a platform with a massive global user base
• you need voice and video calls that work for most contacts

Choose Facebook Messenger if…

• you already have a Facebook account and want seamless login
• you need group chats that hold up to 250 participants
• you want built‑in stickers, GIFs, and emoji reactions
• you don’t mind occasional ads in exchange for a free service

Choose Threema if…

• you need a messaging app that doesn’t require a phone number
• you must keep chat data within Swiss jurisdiction
• you require on‑premises deployment for compliance
• you want zero‑knowledge architecture that even the provider