Discord vs Slack

Discord's REST and Gateway APIs let bots and apps manage servers, channels, messages, and slash commands, authenticated with a bot token for server-side integrations or OAuth2 for user-facing flows like account linking. Rate limits are enforced per route and per bucket, and most guild-management scopes only work once the bot has been added to a server with matching OAuth2 permission scopes.

Slack's Web API lets registered apps read and post messages, manage channels, and react to workspace events, authenticated with OAuth 2.0 bot or user tokens scoped to a single Slack workspace. Methods are rate-limited across four tiers and most write actions cap out around one request per second per workspace, so high-throughput integrations typically move to the Events API or Socket Mode instead of polling.