Compare
NyxTalk, Slack and Teams, side by side.
Slack and Teams keep your conversations in their cloud. NyxTalk keeps them on your server, encrypted so that even your server can't read them. Here is the detail — sources at the bottom of the page.
| Criterion | Slack | Microsoft Teams | NyxTalk |
|---|---|---|---|
| Where the data lives 1 4 | Slack's cloud (Salesforce) | Microsoft 365 cloud | On your server, on your premises |
| Can the provider read the messages? 1 2 4 5 | Technically yes: encryption at rest and in transit, server-side; customer-managed keys (EKM) as an option on Enterprise+ | Technically yes: encrypted at rest so that the organisation can decrypt content (eDiscovery); end-to-end encryption limited to one-to-one calls and Teams Premium meetings | No: MLS end-to-end encryption for every message, file and call |
| Exposure on the Internet 6 7 | Public sign-in pages and APIs | Public sign-in pages and APIs | One silent UDP port; no public page or API |
| Who can sign in 8 | Any device with the credentials (+ two-factor, depending on settings) | Any device with the credentials (+ Conditional Access, depending on licence) | Only an enrolled device, with password and security key |
| Telemetry 3 9 | Yes: usage, log and device data | Yes: required diagnostic data | None |
| Integrations 10 11 | Very large app catalogue | Microsoft 365 suite and app store | Deliberately limited: no third-party app enters the encrypted perimeter |
The last line is deliberate. NyxTalk does less than Slack and Teams when it comes to integrations — because anything that plugs into the conversations would have to read them. If your team lives on hundreds of connected apps, NyxTalk is not a drop-in replacement; if your conversations must stay confidential, that limit is the point.
Sources
Slack and Microsoft Teams columns summarise the vendors' public documentation, checked on 5 November 2026. Plans and features change: refer to the current documentation. Slack is a trademark of Slack Technologies, LLC; Microsoft Teams is a trademark of Microsoft Corporation.
- Slack — Security at Slack (“customer data is encrypted at rest and in transit by default”)
- Slack — Enterprise Key Management (Enterprise+ add-on, keys in AWS KMS)
- Slack — Privacy policy (log data, device information, usage information)
- Microsoft Learn — Security guide for Microsoft Teams (“encrypted at rest … so that organizations can decrypt the content if needed”)
- Microsoft Learn — End-to-end encryption for Teams meetings and one-to-one calls (Teams Premium for meetings)
- Slack — Web API
- Microsoft Learn — Microsoft Graph Teams API overview
- Microsoft Learn — What is Conditional Access? (Microsoft Entra ID P1 licence)
- Microsoft Learn — Privacy controls for Microsoft Teams (required diagnostic data)
- Slack Marketplace
- Microsoft Learn — Apps in Microsoft Teams
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