kitio.aiMicrosoft 365 Agents SDK vs CircleChat
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Microsoft 365 Agents SDK is completely free, while CircleChat is freemium.
Microsoft SDK for building agents that run in Teams, Copilot and the web
FreeAt a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Python, JavaScript and .NET SDKs
- Deploy to Teams and Microsoft 365 Copilot
- Bring your own AI model
- Conversation state handling
- Local testing tools
- Goal-to-task planning
- Skill-based task routing
- Approval for risky actions
- Shared task board
- Works with any model
- Docker self-hosting
| Feature | Microsoft 365 Agents SDK | CircleChat |
|---|---|---|
| Best for | Microsoft SDK for building agents that run in Teams, Copilot and the web | Open-source team chat where AI agents plan and do tasks |
| Category | Agents & automation | Agents & automation |
| Pricing model | Free | Freemium |
| Starting price | Free | $29/mo |
| Free plan | Yes, fully free | Yes |
| Made by | Microsoft | CircleChat |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Microsoft 365 Agents SDK is completely free, while CircleChat is freemium.
Free plan
Cheapest paid plan
Top plan
Free trial
4 plans
Self-host
Free
- MIT licensed
- Your own servers and model keys
Starter
$29/mo
- Per workspace
- 3 agents
- Dedicated single-tenant server
Team
$79/mo
- Per workspace
- 10 agents
- Custom domain
Scale
$199/mo
- Per workspace
- Unlimited agents
Prices in USD, checked Nov 5, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Microsoft 365 Agents SDK
- Free and open source
- Reaches Teams and Copilot users directly
- Works with any model or orchestrator
- Requires coding knowledge
- Hosting and Azure services cost extra
- Tied closely to the Microsoft ecosystem
CircleChat
- Free to self-host under MIT license
- Flat per-workspace pricing
- Human sign-off on risky steps
- Cloud trial requires a card
- Starter cloud plan caps you at 3 agents
- Self-hosting means running your own server
Which one should you choose?
Choose Microsoft 365 Agents SDK if you want:
- Free and open source
- Reaches Teams and Copilot users directly
- Works with any model or orchestrator
Watch out: requires coding knowledge.
Choose CircleChat if you want:
- Free to self-host under MIT license
- Flat per-workspace pricing
- Human sign-off on risky steps
Watch out: cloud trial requires a card.
Microsoft 365 Agents SDK vs CircleChat FAQ
What is the difference between Microsoft 365 Agents SDK and CircleChat?
Microsoft 365 Agents SDK: Microsoft SDK for building agents that run in Teams, Copilot and the web. CircleChat: Open-source team chat where AI agents plan and do tasks. Both are agents & automation tools.
Is Microsoft 365 Agents SDK or CircleChat cheaper?
Microsoft 365 Agents SDK is completely free, while CircleChat is freemium.
Do Microsoft 365 Agents SDK and CircleChat have free plans?
Microsoft 365 Agents SDK: Yes, fully free. CircleChat: Yes.
Who makes Microsoft 365 Agents SDK?
Microsoft 365 Agents SDK is made by Microsoft, based in United States.
Who makes CircleChat?
CircleChat is made by CircleChat.
Which should I choose, Microsoft 365 Agents SDK or CircleChat?
Choose Microsoft 365 Agents SDK if you value free and open source and reaches teams and copilot users directly. Choose CircleChat if you value free to self-host under mit license and flat per-workspace pricing.