Comparing NICE CXone and Sierra AI? Both are Enterprise and Voice & Phone AI 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 | NICE CXone | Sierra AI |
|---|---|---|
| Pricing | Paid · $110/agent/mo | Per resolution · Custom |
| Founded | 1986 | 2023 |
| Categories | Contact Center & CCaaS Enterprise Voice & Phone AI | AI Agents & Chatbots Enterprise Voice & Phone AI |
| Integrations | Salesforce Microsoft Dynamics Oracle ServiceNow Zendesk Kustomer Pega Snowflake | Salesforce Zendesk Shopify Twilio Stripe Snowflake |
NICE CXone is an enterprise cloud contact center platform covering the full span of customer service work: omnichannel routing across voice, chat, email, and social, IVR and self-service AI agents, copilots that assist human agents and supervisors in real time, plus workforce management, quality management, and interaction analytics. The AI layer runs on Enlighten, NICE's family of models trained on billions of customer interactions, and the platform powers more than 25 billion interactions a year.
The company story stretches back to 1986, when NICE was founded in Israel as Neptune Intelligence Computer Engineering. It trades on Nasdaq and the Tel Aviv exchange under the ticker NICE, and spent decades in call recording and analytics before buying cloud contact center pioneer inContact in 2016, the deal that created CXone. In June 2024 it bundled Copilot, Autopilot, and Actions into a rebranded platform called CXone Mpower. In 2025 came a new CEO, Scott Russell, a lowercase rebrand to NiCE, and the roughly 955 million dollar acquisition of German conversational AI firm Cognigy, announced in July and closed in September.
Pricing is refreshingly public for an enterprise vendor. The current page lists five suites billed per agent per month: Omnichannel at 110 dollars, Essential at 135, Core at 169, Complete at 209, and Ultimate at 249 plus 25 cents per session. Industry packages for banking, insurance, healthcare, and retail sit at the top tier. Many AI capabilities are add-ons or consumption based, so a realistic AI-heavy rollout still ends in a custom quote.
Choose NICE if you run a large or regulated contact center and want routing, workforce management, quality, and AI from a single vendor with decades of compliance pedigree. The Cognigy deal also makes it a credible bet for enterprises going all in on agentic AI. Look elsewhere if you run a small support team: the packaging and implementation lift assume hundreds or thousands of seats, and a lighter helpdesk with a bolt-on AI agent will get you live much faster.
Read the full NICE CXone listing → · See NICE CXone 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.