HeyChat vs Microsoft

HeyChat and Microsoft are both personal assistants tracked by AIDiveForge. Below is a side-by-side comparison of pricing, capabilities, platforms, and ownership — sourced from each tool's live website and verified before publishing.

HeyChat

HeyChat is an open-source desktop chat client built on Tauri v2, React, and TypeScript. It handles real-time streaming conversations across Google Gemini, OpenAI, Groq, Anthropic, Ollama, and any OpenAI-compatible endpoint, with chat history stored locally in SQLite. The keychain-backed credential storage means your API keys never sit in a dotfile. Where it breaks: this is a chat interface, not a workflow builder — there are no tool calls, no agents running tasks on their own, no branching logic. Teams that need anything beyond a multi-provider chat window will hit that ceiling fast.

Microsoft

Microsoft reports 15 million paid Microsoft 365 Copilot seats out of 450 million total commercial seats, but fewer than 4 in 10 employees with Copilot access actively use it. Seventy percent of Fortune 500 companies have adopted Microsoft 365 Copilot, but for most adoption means pilots and phased rollouts, rather than enterprise-wide deployment. The platform integrates into Word, Excel, PowerPoint, Outlook, and Teams with enterprise-grade security and compliance—no duplication, just personalized, context-aware results. But production pushes the limits. In September 2025, a tweet noting that Copilot in Excel fails at simple math went viral. A small business teaching copilot reported failure of over 25 scheduled prompts over the past four days. Nearly half of IT leaders say they lack confidence in their ability to manage Copilot's security and access risks. Many users, even within companies that have made the investment, are continuing to opt for ChatGPT over Microsoft's integrated AI assistant.

Attribute	HeyChat	Microsoft
Pricing	Free	Paid
Free trial	No	No
Open source	Yes	No
Has API	No	No
Self-hosted option	Yes	No
Platforms	Linux, macOS, Windows	—
Pros	API keys stored in the OS native keychain rather than plain-text files, so a leaked dotfile or accidental repo push does not expose your credentials. Provider-agnostic design covering Google Gemini, OpenAI, Groq, Anthropic, Ollama, and any OpenAI-compatible endpoint, so switching from a cloud model to a local one when costs or privacy requirements shift is a sidebar toggle rather than a reinstall. Local SQLite persistence for chat history, which means your conversation records stay on your machine and are not logged on a vendor's server. Real-time response streaming across all supported providers, so you read output as it generates rather than waiting for a full completion round-trip.	Copilot works inside Microsoft 365 apps with enterprise-grade security and compliance, so sensitive data stays within your tenant and respects existing permission controls. Microsoft 365 Copilot is becoming a daily habit for knowledge workers, transforming their work, workflow, and work artifacts, backed by reported cases like UK government pilots saving 26 minutes per day and Microsoft legal department completing tasks 32% faster with 20% accuracy boost. Copilot Business becomes available on December 1, 2025 at an SMB-friendly price, removing the minimum seat commitment that previously locked out smaller teams. Beginning October 2025, Sales, Service, and Finance Copilots are included in core offerings at no additional cost. Removing this price barrier could prompt faster adoption. Copilot is integrated into Microsoft 365 apps for tasks like summarizing emails, drafting documents, analyzing data, and capturing meeting notes. It works seamlessly across Teams, Outlook, Word, Excel, and PowerPoint while honoring security and compliance settings.
Cons	No tool-use, function calling, or agent loops of any kind — the moment a team needs a model to fetch data, run code, or chain steps without a human typing each prompt, HeyChat offers nothing and teams move to a tool like Open WebUI or a workflow builder that exposes those primitives. No API surface and no programmatic trigger, so the app cannot be embedded in a pipeline, called from a script, or integrated with external automation; teams that need HeyChat's output to feed into another system have no supported path and typically abandon it for a client that exposes an API or plugin interface. A small contributor base and 16-commit history at curation means production bugs may sit unresolved for extended periods, and teams running this in a shared or organizational context carry the maintenance burden themselves under the MIT license.	Fewer than 4 in 10 employees with Copilot access actively use it, and many users within companies that made the investment continue to opt for ChatGPT. Training is not optional—skip it and the tool sits unused. In September 2025, a viral tweet noted that Copilot in Excel fails at simple math. Accuracy gaps appear in high-stakes output—spreadsheet formulas, financial analysis, complex calculations—exactly where you can't afford hallucinations. Scheduled prompts fail at execution with no clear error path. One small business reported failure of over 25 scheduled prompts over four days. Automation becomes a reliability liability. Copilot works inside your Microsoft 365 environment, meaning it can tap into all the files and emails users have access to. Existing over-permissions become the biggest risk factor. AI agents inherit the permissions of the users and admins who deploy them. If an admin creates an AI agent, it can do whatever they want, can access anything. Many organizations were unprepared for the implications: agents acting outside human review, operating with delegated or non-human identities. Nearly half of IT leaders say they lack confidence in their ability to manage Copilot's security and access risks. Governance and permission remediation are preconditions, not nice-to-haves. Preparing data, configuring permissions, and enabling users requires heavy investment of time and resources.

Bottom line

HeyChat is free while Microsoft is paid; HeyChat is open source; only HeyChat can be self-hosted. Pick the difference that actually blocks you.

Frequently asked questions

What is the difference between HeyChat and Microsoft?

HeyChat is Free and open source, while Microsoft is Paid. Compare pricing, free trial, API, platforms, and pros/cons in the table above on AIDiveForge.

Is HeyChat better than Microsoft?

It depends on your workflow. Use the side-by-side attributes (pricing, open source, API, self-hosted, platforms) to decide. AIDiveForge does not rank a universal winner — we publish verified facts so you can choose.