Comparing Gladly Sidekick and Sierra AI? Both are AI Agents & Chatbots 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 | Gladly Sidekick | Sierra AI |
|---|---|---|
| Pricing | Paid · ~$180/seat/mo | Per resolution · Custom |
| Founded | 2014 | 2023 |
| Categories | AI Agents & Chatbots E-commerce Support Help Desk & Ticketing | AI Agents & Chatbots Enterprise Voice & Phone AI |
| Integrations | Shopify Salesforce Zendesk Twilio Amazon Connect Slack | Salesforce Zendesk Shopify Twilio Stripe Snowflake |
Gladly organizes support around people instead of tickets, and that one decision changes everything about how it feels. Every customer gets a single lifelong conversation thread that follows them across voice, chat, SMS, email, and social, so they never have to repeat themselves and your agents always see the full story. Sidekick, its AI agent, lives inside that thread, resolving requests using real customer context and taking genuine actions like tracking an order, starting a return, or making a change, then handing off to a human with everything already in view.
A recent standout is Sidekick on Voice, which Gladly bills as the industry's only AI voice agent powered by that lifelong, multichannel history, so a phone conversation picks up right where a chat left off. The company has kept expanding the family with Sidekick Sales for product recommendations, Sidekick Email, and versions that extend the agent onto Zendesk and Salesforce, so teams on other platforms can borrow its brain.
Gladly was founded in 2014 by Joseph Ansanelli and his co-founders, and it has leaned cheerfully into its theme, naming its pricing tiers Hero and Superhero. It is very much an enterprise product, sold largely by quote with seat minimums, and its Sidekick AI is billed per conversation or resolution on top. That positioning fits its customer base of consumer brands that treat support as a loyalty channel, including Crate and Barrel, Ulta Beauty, and Breeze Airways.
The through-line here is emotional as much as it is technical: Gladly wants every interaction to feel like talking to a company that genuinely remembers you and your history. If you sell to consumers who expect a personal, continuous relationship rather than a cold, fresh ticket every single time they reach out, Gladly and its Sidekick agent are built from top to bottom around exactly that promise.
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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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