Cognigy vs Sierra AI (2026)
Comparing Cognigy and Sierra AI? Both are AI Agents & Chatbots, 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 pricing and an estimated monthly bill, channels, compliance claims, and integrations, plus when each is the better fit, so you can pick on the facts rather than either vendor's own sales page.
At a glance
| Attribute |
 Cognigy
|
 Sierra AI
|
|---|---|---|
| What it is | Support your customers and agents with Cognigy.AI, powered by Generative AI on voice and chat | AI agent mirrors the nuances of human communication, ensuring seamless and organic customer service interactions while improving customer satisfaction. |
| Pricing | Paid · Custom | Per resolution · Custom |
| Est. monthly cost | No published price to estimate | No published price to estimate |
| Founded | 2016 | 2023 |
| Categories | AI Agents & Chatbots Contact Center & CCaaS Enterprise Voice & Phone AI | AI Agents & Chatbots Enterprise Voice & Phone AI |
| Channels | ||
| Chat | ✓ | ✓ |
| — | ✓ | |
| Voice | ✓ | ✓ |
| SMS | — | ✓ |
| — | ✓ | |
| Compliance (vendor-claimed) | ||
| SOC 2 | ✓ | ✓ |
| HIPAA | ✓ | ✓ |
| GDPR | ✓ | ✓ |
| ISO 27001 | ✓ | ✓ |
| PCI DSS | ✓ | ✓ |
| FedRAMP | — | ✓ |
| ISO 42001 | — | ✓ |
| EU AI Act | — | ✓ |
| Data residency | EU, US, UK, Australia (more via NiCE CXone regions) | Not verified |
| Languages | 100+ languages | 59 languages |
| What the AI can do | ||
| Takes actions | ✓ | ✓ |
| Hands off to a human | ✓ | ✓ |
| Choice of LLM | ✓ | Not verified |
| Buying | ||
| Free trial | Free trial (length not stated), no credit card | Not verified |
| How you buy | Self-serve signup | Not verified |
| Minimum commitment | — | — |
| Company | Acquired by NiCE (September 2025) | Independent, venture-backed |
| Works with | Genesys Amazon Connect Avaya 8x8 Twilio Salesforce Zendesk ServiceNow | Salesforce Zendesk Shopify Twilio Stripe Snowflake |
| Key features |
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| Next step |
Full listing Visit site → |
Full listing Visit site → |
Estimates assume 5,000 conversations a month, 60% handled by AI and 10 agent seats, at each vendor's published list price (the cost calculator's model); treat them as a floor, not a quote. Compliance rows are what vendors publicly claim, and “Not verified” means we have not confirmed that fact yet, not that the tool lacks it.
Choose Cognigy or Sierra AI?
Choose Cognigy if
Best for: Large enterprises, especially in Europe, that want voice-first conversational AI in 100+ languages with a low-code builder, their own choice of LLM, residency in the EU, US, UK or Australia, and tight integration with Genesys, Amazon Connect, Avaya or NiCE CXone.
- you prefer a flat subscription to usage-based billing
Look elsewhere if you are a small or mid-size team or want published pricing: Cognigy is enterprise and custom-priced, and since the 2025 NiCE acquisition its roadmap sits inside a larger contact-center vendor.
Choose Sierra AI if
Best for: Large brands that want one branded agent deployed across chat, voice, email, SMS and WhatsApp, with voice agents that can take a payment mid-call, outcome-based pricing, 59 languages and the broadest compliance list in the directory including FedRAMP, ISO 42001 and the EU AI Act.
- you need Email, SMS, and WhatsApp coverage
- you need a vendor that publicly claims FedRAMP, ISO 42001, and EU AI Act
- you would rather pay per resolved ticket than per seat
Look elsewhere if you are not an enterprise: Sierra sells multi-year contracts by quote with no trial or self-serve start, and its verified facts do not include a stated data residency.
About Cognigy
Cognigy, now part of contact-center giant NiCE, builds AI agents for the enterprise, with a particular strength in voice. Its flagship Cognigy.AI platform deploys autonomous agents that reason, adapt, and take action across voice and digital channels in more than a hundred languages, and it pairs them with an Agent Copilot that assists human reps and a Knowledge AI layer that grounds answers in your content. A no-code conversation builder lets teams design and orchestrate sophisticated flows without heavy engineering, and the platform integrates tightly with contact-center systems like Genesys and Amazon Connect.
The company has serious enterprise credibility. Founded in 2016 in Dusseldorf, Germany, by Philipp Heltewig and Sascha Poggemann, Cognigy grew into a repeat leader in analyst rankings for conversational and agentic AI, and in 2025 it was acquired by NiCE in a cash-and-stock deal reported around nine hundred and fifty million dollars, described as one of Europe's largest AI acquisitions. It now runs both inside NiCE's broader platform and as a standalone product, so existing customers were not left stranded.
The client roster is a roll call of household names, including Lufthansa Group, Bosch, Toyota, Mercedes-Benz, Nestle, and DHL, with well over a thousand brands relying on it to automate conversations at genuinely large scale. Pricing is enterprise and custom, with no public price list or self-serve tier, and voice, chat, and add-ons like Agent Copilot are typically quoted separately, so this is a considered purchase rather than an impulse buy.
For big organizations that need to automate high call volumes across many languages, keep human agents in the loop, and slot AI into an existing contact-center stack rather than replacing it, Cognigy is one of the most established and well-regarded choices on the market today, and the deep-pocketed NiCE backing only extends its already-broad enterprise reach.
Read the full Cognigy listing → · See Cognigy alternatives →
About Sierra AI
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 →
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