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ASAPP vs Sierra AI (2026)

Comparing ASAPP 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

Conversations/mo

% handled by AI

Agent seats

Price it at my volume

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 ASAPP or Sierra AI?

About ASAPP

ASAPP builds AI for very large contact centers. Its current product is ASAPP CXP, a customer experience platform built around GenerativeAgent, an AI agent that handles voice and chat conversations end to end: it is grounded in your knowledge base, connects to core systems to take actions, handles interruptions and topic changes, and keeps a persistent memory of each customer across interactions. CXP adds testing and simulation before launch, observability tools that log every agent decision, and, since April 2026, multiple specialised AI agents with orchestration. It sits in front of or alongside an existing CCaaS rather than replacing it, connecting over SIP, APIs, a web SDK, MCP and A2A, and prebuilt connectors including Amazon Connect, Salesforce, Zendesk, Twilio, HubSpot, Freshdesk, SharePoint and Snowflake.

The behaviour worth understanding is how ASAPP handles the moment the AI gets stuck. Instead of a classic handoff, its Human-in-the-Loop Agent (HILA) workflow lets GenerativeAgent ask a human for guidance or approval without leaving the conversation; the human works in a workspace called AgentDesk and can observe, approve or override responses, and ASAPP says one person can oversee multiple voice calls at once. That makes it a fit for operations that cannot fully automate high-stakes contacts but want far fewer humans per contact. ASAPP also leans on safety credentials: automated input and output filters, hallucination checks, continuous red teaming against more than 50 vulnerability types, zero data retention and PII redaction before storage.

Gustavo Sapoznik founded ASAPP in June 2015 to build AI specifically for customer service, starting with an asynchronous messaging platform and response suggestions for agents, moving into voice in 2018 and launching GenerativeAgent in May 2024. Katie Stein became CEO in August 2026. Its board and investors include John Doerr of Kleiner Perkins and Dave Strohm of Greylock, with Frank Slootman on the board. Published customer results are airline-heavy: JetBlue's AI agent, Amelia, reports a 45 percent containment rate and 73,000 labour hours saved in one quarter, and American Airlines saw CSAT rise 11 percent with over half of inquiries contained within six months. Dish, Altice USA and Tangerine Bank are also named.

ASAPP publishes no pricing; access is through a demo with its sales team. Choose ASAPP if you run a large, high-volume contact center in travel, telecom, insurance or financial services and want an AI agent that resolves contacts under human supervision without ripping out your CCaaS. Skip it if you are a mid-market or smaller support team: the product, the case studies and the sales motion are all aimed at enterprises.

Read the full ASAPP listing →  ·  See ASAPP 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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