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Siesta AI vs Microsoft 365 Copilot
Microsoft 365 Copilot is great inside the Microsoft stack. Siesta AI is the universal AI work platform — connecting every tool, every model and every cloud your teams actually use.
Siesta AI
- Connects to 100+ enterprise apps out of the box (Microsoft 365, Google, Slack, Salesforce, Notion, Jira, etc.)
- Permissions-aware enterprise search across all your knowledge — not just Microsoft tenants
- Custom AI agents and workflows you can build without code in minutes
- Choose your model: GPT, Claude, Gemini, Mistral or your own private LLM
- Deploy in SaaS, EU-hosted, hybrid or fully private cloud
- Transparent, predictable per-seat pricing — no surprise add-ons
Microsoft 365 Copilot
- Tied to the Microsoft 365 ecosystem — limited value outside the Microsoft stack
- Search constrained to Graph data; struggles with non-Microsoft sources
- Agent building requires Copilot Studio and additional licensing
- Locked to OpenAI models served via Azure
- SaaS-only inside Microsoft commercial cloud
- License required per user plus consumption-based add-ons
Why teams compare us
When teams pit Siesta AI against Copilot
Universal knowledge
They need answers across every tool their teams use — not just files that live in SharePoint and OneDrive.
Custom agents
They want to ship purpose-built agents for sales, support, HR or ops without buying yet another platform.
Sovereign AI
They need EU-hosted or on-prem deployment, model choice, and audit-grade governance their compliance team can sign off on.
Side-by-side
How Siesta AI compares to Microsoft 365 Copilot
Five capability areas that decide which platform actually serves the whole company.
Find anything, across every system
Siesta indexes your full stack with permission-aware retrieval. Copilot is mostly limited to Microsoft Graph.
Siesta AI
Microsoft 365 Copilot
Cross-app search
Native connectors for 100+ tools including Slack, Notion, Confluence, Jira, Salesforce, HubSpot, Zendesk, GitHub, Box, Dropbox.
Strong inside Microsoft 365. Limited or licensed-only access to non-Microsoft sources.
Permissions-aware
Mirrors source-system ACLs in real time; users only see what they are entitled to.
Inherits Microsoft Graph permissions; coverage of non-Microsoft sources varies.
Semantic + keyword
Hybrid retrieval with re-ranking tuned per workspace; cite-as-you-answer for every result.
Semantic search over Microsoft data; citations vary by surface.
An assistant grounded in your company knowledge
Siesta gives every team an assistant that reasons over your real data with the model you choose.
Siesta AI
Microsoft 365 Copilot
Model choice
GPT-4/5, Claude, Gemini, Mistral, Llama or your own private LLM — switch per workflow.
OpenAI models via Microsoft Azure only.
Grounded answers
Every answer is cited with source documents and respects the asking user's permissions.
Citations available in Microsoft surfaces; coverage varies elsewhere.
Multi-channel
Web app, browser extension, Slack, Teams, mobile and embedded SDK.
Primarily inside Microsoft 365 surfaces (Word, Excel, Teams, Outlook).
Build agents that actually do the work
Ship custom agents in minutes — no separate platform, no extra licensing.
Siesta AI
Microsoft 365 Copilot
Agent builder
Visual, no-code builder for prompts, tools, knowledge and approvals — included in every plan.
Requires Copilot Studio with additional licensing and tenant configuration.
Triggers & actions
Schedule, webhook, email and event triggers; actions across 100+ connected apps.
Power Automate flows; primarily Microsoft-centric actions.
Templates
20+ pre-built agents for sales follow-ups, deadline reminders, RFPs, onboarding, IT triage.
Limited template gallery focused on Microsoft workflows.
Automate end-to-end work
Move beyond chat: orchestrate multi-step work across the apps your teams already use.
Siesta AI
Microsoft 365 Copilot
Multi-step automation
Visual workflows chaining retrieval, generation, approvals, and actions across any connected tool.
Available via Power Automate; additional licensing applies for premium connectors.
Human-in-the-loop
Built-in approval steps, audit trail and rollback for sensitive actions.
Approvals available through Power Platform components.
Recordings & analytics
Every run is logged with inputs, outputs, latency and cost — exportable to your BI stack.
Telemetry mostly within Microsoft admin center.
Sovereign by design
Choose how and where Siesta runs — and prove it to your compliance team.
Siesta AI
Microsoft 365 Copilot
Deployment options
SaaS, EU-hosted, hybrid or fully private cloud (AWS, Azure, GCP, on-prem).
SaaS only inside Microsoft commercial cloud.
Data residency
Pin all data and inference to EU regions; no training on customer data, ever.
EU Data Boundary covers most services; inference geography depends on tenant settings.
Compliance
ISO 27001, SOC 2 Type II, GDPR — full DPA with sub-processor list.
Microsoft enterprise compliance suite.
Learn more about Siesta AI
FAQ
30-minute walkthrough on your Microsoft 365 tenant — and everything else you use.