Comparing HubSpot Breeze and Sierra AI? Both are AI Agents & Chatbots tools in the directory, which is why buyers put them on the same shortlist. Below is a side-by-side look at how they price, what they integrate with, and when each is the better fit, so you can pick on the facts rather than either vendor's own sales page.
| Attribute | HubSpot Breeze | Sierra AI |
|---|---|---|
| Pricing | Per resolution · $0.50/resolution | Per resolution · Custom |
| Founded | 2006 | 2023 |
| Categories | AI Agents & Chatbots Help Desk & Ticketing | AI Agents & Chatbots Enterprise Voice & Phone AI |
| Integrations | Slack Shopify Salesforce Gmail Jira Stripe | Salesforce Zendesk Shopify Twilio Stripe Snowflake |
Breeze is HubSpot's AI layer, and its Customer Agent is the piece aimed squarely at support teams running on Service Hub. It resolves conversations end to end by learning from your knowledge base, website, and uploaded documents, and because it is native to HubSpot's Smart CRM it pulls customer context directly, with no separate integration to wire up. When it cannot finish a job it creates a ticket, triggers a workflow, or hands off to a human, and it works in multiple languages with a tone you can tune to sound like your brand.
HubSpot has leaned hard into outcome-based pricing here, and recently made it even friendlier. In 2026 it cut the price of a resolved conversation in half, to fifty cents, and bundles a monthly allotment of free resolutions into Service Hub Pro and Enterprise before any overage kicks in. In other words, you only pay when the agent actually finishes the job, and the best teams reportedly push resolution rates past ninety percent.
The company behind it needs little introduction. HubSpot was founded in 2006 by Brian Halligan and Dharmesh Shah, grew into the go-to platform for inbound marketing, sales, and service, and now trades publicly. That heritage is exactly why Breeze is such a natural pick: the many thousands of small and mid-size businesses already running their marketing, sales, and support on HubSpot get an AI agent that plugs into everything they already use.
Customers tell good stories too, with meal service Nutribees reporting that Breeze slashed the share of tickets its humans had to touch. If you live inside HubSpot and want an AI support agent that shares your CRM data out of the box, bills only for wins, and takes minutes rather than months to try, Breeze Customer Agent is a straightforward and easy yes.
Read the full HubSpot Breeze listing → · See HubSpot Breeze alternatives →
Sierra builds conversational AI agents for the enterprise, and it arrived with about as much star power as a startup can carry. It was founded in 2023 by Bret Taylor and Clay Bavor, and if those names ring a bell it is because Taylor co-created Google Maps, served as CTO of Facebook and co-CEO of Salesforce, and currently chairs the board of OpenAI, while Bavor spent eighteen years at Google leading its virtual and augmented reality work. Company lore says the whole thing was hatched over a grilled branzino lunch in Palo Alto.
The product lives up to the pedigree. From a single build, Sierra deploys a branded agent across chat, voice, email, SMS, and even ChatGPT, following your policies, adopting your brand's voice, and escalating gracefully when a conversation gets thorny. Its voice agents are a standout: they hold natural, low-latency conversations, read sentiment, and can even take a credit card or ACH payment over the phone in one uninterrupted call, with no clumsy handoff to a separate system.
Under the hood sits Agent OS, a platform for building, testing, and supervising agents, with tooling to run voice simulations and rehearse behavior before anything reaches a real customer. Pricing is outcome-based, tied to conversations or successful resolutions and wrapped in multi-year enterprise contracts, so Sierra is aimed at large brands rather than weekend experimenters. Reported customers include SoFi, Ramp, and Brex, and the company says its agents already serve a meaningful slice of the Fortune 50.
Sierra's fundraising has kept pace with its towering ambition, vaulting the company into the rarefied tier of the most valuable AI startups in barely two years. For enterprises that want polished, on-brand agents across every channel and are willing to invest the time and budget to do it properly, Sierra is a genuine marquee choice.
Read the full Sierra AI listing → · See Sierra AI alternatives →
Submit your AI customer support software to get listed alongside these tools and show up in head-to-head comparisons.