What Is Sauna (sauna.ai)? A Proactive AI Teammate With Its Own Computer

Updated

Sauna is a proactive AI teammate that runs in the cloud with "a computer of her own," per the site. It researches topics, follows up on your behalf, and builds apps and routines for you and your team, working through your existing tools and reachable from the web, Slack, or iMessage. It's aimed at teams and individuals who want work to keep moving when they're offline — the site frames it as "your work doesn't have to stop, even when you do." You can start for free, with $50 in free credits and cancel-anytime terms listed on the homepage.

What Sauna actually does

The core idea is an AI teammate that doesn't wait for a prompt to be useful. According to the site, Sauna:

  • Researches — it can query tools like PostHog and work through analysis. The homepage shows an example where Sauna attributes visitors to their first source, compares signup and customer conversion, and concludes: "I'd double down on referrals. They bring fewer visits, but much more intent."
  • Follows up — it drafts messages in your voice, tracks what matters, files tickets, and delivers briefings.
  • Builds apps — it creates custom apps and routines for your team, described as a way to "10x your team's output."

The homepage's rotating headline list hints at the range of use cases: running your company from iMessage, your GTM (go-to-market) from Slack, your hiring from email, and "your life from custom apps."

How you interact with it

Sauna meets you where you already work rather than requiring a new interface:

Surface What it's for
Web Full workspace with channels and artifacts
iMessage Quick tasks and updates from your phone
Slack Team channels like #Growth, #Sales, #Support, #Eng, #Finance, #Hiring

The site lists 4,600+ tools and integrations, and shows a workspace organized into channels (# Growth, # Sales, # Founders, # Support, # Eng, # Content, # Finance, # Ads, # Tools, # Hiring, # Relationships). There's also an "Artifacts" area, suggesting outputs are saved and shareable.

The "proactive" and "always-on" angle

Two features distinguish Sauna from a standard chatbot:

  1. It runs around the clock in the cloud. You don't have to be online for work to move forward — it drafts, tracks, files, and briefs on its own schedule.
  2. Peer-to-peer between Saunas. The site describes a model that's "individual, but connected — every Sauna can open the door to another." You can ask a colleague's Sauna a question or pull their perspective. This is a notable design choice: instead of one shared bot, each person gets their own teammate that can talk to others.

Who it's for

The homepage lists users across a wide range of organizations — Anthropic, Figma, Zapier, Atlassian, HubSpot, Stanford, MIT, Y Combinator-backed startups, and others — plus backing from Spark Capital and Y Combinator. That spread suggests it's positioned for both startups and larger teams, particularly in growth, sales, and operations roles where research and follow-up are constant.

Getting started and what to check

  • You can get started for free or try it on iMessage, per the homepage.
  • The site advertises $50 in free credits and cancel anytime.
  • Pricing details live at sauna.ai/pricing — the homepage links there but doesn't list specific plan costs, so check that page for current numbers.

If your main need is an assistant that only responds when prompted, Sauna's proactive, always-on model may be more than you need. If you want work to continue while you're away — research, follow-ups, ticket filing, briefings — and you'd rather stay in Slack or iMessage than learn a new tool, Sauna is built for exactly that.