Comparing Posh AI and Sierra AI? Both are AI Agents & Chatbots 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 | Posh AI | Sierra AI |
|---|---|---|
| Pricing | Paid · Custom | Per resolution · Custom |
| Founded | 2018 | 2023 |
| Categories | AI Agents & Chatbots Voice & Phone AI | AI Agents & Chatbots Enterprise Voice & Phone AI |
| Integrations | Fiserv Jack Henry Symitar Corelation COCC Q2 Alkami Glia Genesys Cloud | Salesforce Zendesk Shopify Twilio Stripe Snowflake |
Posh AI builds an agentic AI platform for banks and credit unions, covering both sides of the desk. Member facing products include a Voice Assistant for 24/7 phone support, a Digital Assistant for web and mobile chat, Posh Answers for help center search, and Posh Translate for live spoken interpretation. Employee facing tools include a Knowledge Assistant, a training Simulator, and CoachQA for conversation quality and compliance monitoring. All agents run inside Operating Procedures, Posh's framework for pairing LLM flexibility with code level control.
Karan Kashyap and Matt McEachern founded Posh in 2018 out of MIT, where both studied AI, and the Boston company remains independent and active as of mid 2026, with no acquisition on record. It raised a $27.5 million Series A led by Canapi Ventures in December 2021, with credit union industry funds Curql Collective and CMFG Ventures participating, and third party trackers put total funding around $45 million. Posh serves more than 100 financial institutions, including VyStar Credit Union, Citadel Credit Union, Camden National Bank, and Hudson Valley Credit Union. In late 2025 it relaunched Knowledge Assistant as an AI native workspace for agentic action.
Posh publishes no pricing. Everything is quote based per institution, shaped by asset size, products licensed, and integrations. The company leads with customer ROI stories instead, like Citadel's reported $660,000 in annual savings, so treat those as marketing anchors and negotiate accordingly. Expect a demo led sales cycle and implementation work that depends on your telephony and core stack; nothing about the process is self serve.
Choose Posh if you are a community financial institution that wants credible voice and chat automation plus employee copilots from a team that only does banking, with prebuilt hooks into cores like Fiserv, Symitar, and Corelation. Skip it if you are not a bank or credit union, or if you need transparent self serve pricing.
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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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