Sauna vs Sierra

Sierra talks to your customers. Sauna works for you.

Sierra is a strong platform for the agent that talks to your customers. Sauna is the agent that works for you — it remembers your projects, connects to your internal tools, and does your work across every surface, shared with your team.

Get started for free

Comparing Sauna and Sierra? Sierra is a customer-experience platform for agents that talk to your customers. Sauna is the coworker that works for you — remembering your projects, connecting to your internal tools, and acting across web, Slack, email, and iMessage.

What Sierra is

Sierra, from Bret Taylor and Clay Bavor, is a conversational AI platform for customer experience — companies deploy branded agents that resolve support, billing, and service issues for their own customers. It raised $350M at roughly a $10B valuation in late 2025.

Sierra

Sauna

Who it serves

Your customers, on your behalf.

You and your team, on your own work.

Best at

Resolving support and service at scale.

Researching, drafting, and finishing your internal work.

Where it works

Your support channels and backend.

Web, iMessage, Slack, email, and Superhuman.

Memory

Per-company agent configuration.

Workspace plus session memory of your projects and decisions.

The difference: One is an outward-facing support agent. One is your inward-facing coworker.

See why teams choose Sauna over Sierra.

Get started for free

Why Sauna

Built around your work.

For you
An internal coworker
Sauna isn't a customer-facing bot you deploy. It's the coworker you talk to, doing the work behind the scenes that a support agent never touches.
Memory
It remembers your work
Your projects, people, and decisions, kept across sessions, so it isn't reconfigured per task.
Everywhere
Every surface
Web, iMessage, Slack, email, and Superhuman — the same Sauna, shared with your team.

In context

It knows your work, and acts on it.

Sauna remembers your projects and the people in them, connects to the tools your team runs, and finishes the task — across the web app, Slack, email, iMessage, and Superhuman.

app.sauna.ai/sauna

You

@Sauna what did we land on last week, and update the ticket?

Sauna

Pulling last week's thread and the linked issue.

You settled on three tiers. Updated the ticket — caught up.

Good to know

Questions, answered.

Is Sauna a customer-support platform like Sierra?

No. Sierra builds the agent that answers your customers. Sauna is the agent that does your own work — research, drafts, follow-ups — across your internal tools. They solve different problems.

Could Sauna help my support team behind the scenes?

Yes. Sauna can draft replies, summarize tickets, and pull context from your tools for the humans on support, with your approval. It just isn't the customer-facing front door.