Comparing Cresta and Zendesk QA? Both are Contact Center & CCaaS and QA & Conversation Analytics 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 | Cresta | Zendesk QA |
|---|---|---|
| Pricing | Paid · Custom | Paid · $50/agent/mo (with WFM) |
| Founded | 2017 | 2018 |
| Categories | Agent Assist & Copilots Contact Center & CCaaS QA & Conversation Analytics Voice & Phone AI | Contact Center & CCaaS QA & Conversation Analytics |
| Integrations | Salesforce Five9 Genesys Amazon Connect NICE Avaya | Zendesk Salesforce Service Cloud Intercom Genesys Aircall Kustomer Help Scout |
Cresta started from a simple observation: in every contact center, a handful of agents dramatically outperform the rest, and everything they do differently is sitting in the call recordings. Founded in 2017 by Zayd Enam, Tim Shi, and Sebastian Thrun, the Stanford professor behind Google X and Udacity, Cresta mines those conversations to learn what the best performers do, then coaches every agent in real time: suggested responses, knowledge, and guidance appearing on screen during live calls and chats.
That real-time layer is still the heart of the product, but the platform now spans the full loop. Conversation intelligence gives leaders visibility into every interaction, automated quality management replaces sampled QA scorecards, a training simulator lets agents rehearse against AI customers, and autonomous virtual agents take the high-volume calls that never needed a human. It plugs into the major contact-center stacks, including Five9, Genesys, Amazon Connect, NICE, and Avaya, so it layers onto what you run rather than replacing it.
Cresta sells to serious operations: United Airlines, Alaska Airlines, Cox Communications, Marriott, and Brinks Home are named customers, and investors including Andreessen Horowitz, Sequoia, and Greylock have backed it to the tune of roughly $276 million, most recently a $125 million Series D in late 2024 that valued the company around $1.6 billion. Pricing is enterprise and quote-based, with no public numbers.
Cresta is the pick when your strategy is making human agents better rather than replacing them, especially in revenue-bearing conversations like sales and retention where a slightly better sentence is worth real money. If you want humans out of the loop entirely, look at the autonomous-agent specialists; if you want your hundred agents performing like your best ten, Cresta was built for exactly that.
Read the full Cresta listing → · See Cresta alternatives →
Zendesk QA is the quality assurance layer of Zendesk's workforce engagement suite. Its AutoQA engine scores every customer conversation automatically, not the small sample a human reviewer can reach, grading criteria like empathy, tone, and solution quality across email, chat, and voice, including BPO teams. Spotlight surfaces risky interactions such as churn signals and escalations, real-time QA catches issues while conversations are still live, and a coaching module turns findings into 1:1 sessions. It also evaluates AI agents, comparing bot and human performance side by side.
The product began life as Klaus, founded in Tallinn, Estonia in 2018 by Martin Koiva, Kair Kasper, and Egon Sale, complete with a cartoon dog mascot and a devoted following among support leaders. Zendesk signed a definitive agreement to acquire Klaus in January 2024 and completed the deal on February 12, 2024, folding it into its workforce engagement portfolio alongside the Tymeshift WFM product. Zendesk cites QA customers including Audacy, Kahoot, and Liberty, with results like a 150 percent increase in ticket review volume.
Klaus is no longer sold standalone: Zendesk QA is an add-on to a Zendesk Support or Suite plan. Zendesk's own pricing page lists the Workforce Engagement Bundle, QA plus workforce management, at $50 per agent per month billed annually, while multiple independent pricing breakdowns consistently peg the QA add-on alone at $35 per agent per month. There is no free tier, and final numbers still route through sales.
Choose Zendesk QA if you already run support on Zendesk and want mature automated QA with zero integration friction, or if you need to hold AI agents to the same standard as people. It still connects to outside platforms like Salesforce, Intercom, Genesys, and Aircall, but the center of gravity is now firmly Zendesk. If you want a vendor-neutral QA partner with published a la carte pricing, look at EvaluAgent or MaestroQA instead.
Read the full Zendesk QA listing → · See Zendesk QA alternatives →
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