How to pick a private Google Chat replacement for a real team: encryption model, file workflow, search, calls, administration and migration effort.
Three private surfaces. Same zero-knowledge architecture.
Anything below 10 out of 16 will leak usage back to the old tool within a month.
Matrix-based platforms. Genuinely end-to-end, self-hostable, federation-friendly. Budget for operations and for teaching members about device verification.
Self-hosted team chat. Full control of the servers, but default deployments store readable content; encryption is your project, not the product's.
Zero-knowledge workspaces. Chat and storage under one key model, with client-side search and previews. Fewer options; less integration surface with mainstream suites.
Three private surfaces. Same zero-knowledge architecture.