Sai vs Hermes Agent

Hermes Agent is an open-source agent from Nous Research that you install on your own machine, point at the models you pay for, and drive from a terminal or a chat channel. Sai is a managed computer that already has the desktop, the signed-in accounts and the schedule — and keeps working through the applications that never shipped an API.

What unifies Sai

Always on, not on demand

Sai starts work without you: not only schedules, but events and webhooks — a new email, a PR opening, a meeting about to start. Hermes Agent runs cron jobs too, but the machine underneath them is yours, and a laptop that is closed at 7am is a job that did not run. Sai's runs are independent and go in parallel, so a morning briefing, an inbox sweep and a pipeline refresh are not queued behind each other. Each run leaves the workspace where the last one left it, so the work compounds instead of restarting.

Sai operates an actual desktop: installed applications, a file system, a browser with your signed-in sessions. Hermes Agent is precise inside the shell — commands, files, API calls — and its documentation describes no first-party control of a screen. That line is where most real work sits: internal portals, legacy systems behind a login, vendor dashboards with a hostile export flow, spreadsheets that only open in the desktop app. Sai reaches them by looking at the interface and using it. Zero set-up: no runtime to install, no model keys to supply, no MCP server to write before the first task runs.

A real computer, not a chat window
Your accounts, your call

Sai connects directly to Gmail, Slack, Google Drive, GitHub and Calendar, and signs in on your behalf to sites that have no connector at all. Irreversible actions stop for approval before they happen, and credentials go through an encrypted field the model never reads. You can watch a run on screen, redirect it mid-task, or stop it — Hermes Agent gives you the terminal output and an exported trajectory, which is a record rather than a steering wheel. And you can reach Sai from your phone over iMessage, SMS or Telegram, without opening an app.

Why choose Sai over

Hermes Agent

Feature comparisonSaiHermes Agent
Operates a real desktop Shell, files and APIs; no first-party GUI control in the docs
Works in apps with no API Only if you add tooling through an MCP server
Signed-in browser sessions
Runs on a schedule without you Cron jobs
Event and webhook triggers Time-based schedules; incoming chat messages
Files persist between runs On your own disk
Approval before irreversible actions Dangerous-command prompts; headless runs deny by default
Watch a run and take over mid-task Terminal output and trajectory export, not a live screen
Reachable from your phone iMessage, SMS, Telegram Telegram, Discord, Slack, WhatsApp, Teams
Self-hostable and open source MIT-licensed, runs entirely on your machine
Choose your own model Managed for you Bring your own keys, 300+ models via Nous Portal
Set-up Sign in and start Install per platform, supply model credentials, add skills and MCP servers
Who keeps it running Sai You
Starting price $20/month, desktop included Free and MIT-licensed; you pay model usage and hosting

Feature Comparison

Feature Comparison
Sai
Hermes Agent
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