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Tool
Category
Pricing
Free?
Updated
OpenAI Assistants API
AI Agents
Paid
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Mar 2026
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OpenAI managed API for building stateful AI agents with tools and persistent threads
Best for: OpenAI
Slack AI
AI Productivity
From $10/mo
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Mar 2026
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AI-powered channel summaries, thread catch-ups, and smart search in Slack.
Best for: productivity
Shortwave
AI Productivity
Freemium
✓
Mar 2026
→
AI email client for Gmail with thread summaries and smart bundling.
Best for: productivity
Spark Mail
AI Productivity
Freemium
✓
Mar 2026
→
Smart email client with AI writing, summaries, and team collaboration.
Best for: productivity