Comparisons

Enterprise AI Agents for Ecommerce Compared: Sierra, Decagon, Ada, Manifest AI

Sierra, Decagon and Ada are cross-industry enterprise AI agent platforms. Manifest AI is built only for ecommerce. Here is how the four compare on agent building, channels, sales use cases, pricing and fit.

Sierra, Decagon and Ada are cross-industry enterprise AI agent platforms built for large support organizations, while Manifest AI is an enterprise-grade AI agent platform built specifically for ecommerce, covering both selling and support. If you are a global enterprise with many lines of business, Sierra, Decagon or Ada will feel familiar. If you are an ecommerce or retail brand that wants one agent to drive revenue and resolve tickets across web, WhatsApp, Instagram and email, Manifest AI is built for that job.

Manifest AI is our product; we've tried to represent every tool fairly. Competitor details were checked against each company's own website in October 2026.

The short version

	Sierra	Decagon	Ada	Manifest AI
Positioning	Conversational AI platform for enterprise customer experience	"AI concierge for every customer"	Enterprise agentic customer experience (ACX) platform	Agentic AI platform for ecommerce and retail
Industry focus	Cross-industry	Cross-industry	Cross-industry	Ecommerce and retail
How agents are built	Agent Studio plus Ghostwriter, which builds agents from SOPs, transcripts or plain English	Agent Operating Procedures (AOPs) in natural language	Playbooks and Ada Computer (APIs, code, MCP tools)	No-code Agent Studio
Channels	Chat, SMS, WhatsApp, email, voice, ChatGPT	Chat, email, voice	Messaging, email, voice	Website chat, WhatsApp, Instagram, email, plus AI Voice Calling
Sales use cases	Revenue and lifetime value focus via its Horizon engine	Some, customer-reported revenue from AI conversations	Primarily support	Core: discovery, recommendations, upsell, cart recovery
Pricing	Outcome-based, not published	Not published	Not published	From $500/month, startup plan, free trial
Best for	Large enterprises in many industries	Large enterprises wanting natural-language workflow control	Large support teams with strict compliance needs	Shopify-first brands, SMB to mid-market and enterprise

Sierra

Sierra is one of the best-known names in enterprise conversational AI. Its platform includes Agent Studio for building and managing agents, Ghostwriter (an "agent-building agent" that turns SOPs, transcripts and descriptions into production agents), Insights for monitoring and multivariate testing, and Horizon, which ties conversations to business outcomes. Agents deploy across chat, SMS, WhatsApp, email, voice and ChatGPT.

Strengths: deep enterprise credibility with customers like Wayfair, SiriusXM and CarMax, a broad compliance list (including SOC 2, ISO 27001, HIPAA and PCI DSS), and outcome-based pricing. Sierra says customers are launching in a matter of weeks, and it has published retail examples such as an athletic apparel brand deployed across 19 languages.

Trade-offs for ecommerce: Sierra serves many industries, so commerce is one use case among several. Pricing is not published and the motion is built around enterprise contracts.

Decagon

Decagon builds AI agents defined through Agent Operating Procedures, which describe workflows in natural language so CX and product teams can iterate without complex configuration. It covers voice, chat and email, with built-in testing, A/B experimentation, analytics and a QA layer called Watchtower.

Strengths: strong enterprise customer base including consumer brands such as Rituals Cosmetics, Fanatics, Soho House and Hunter Douglas. Natural-language AOPs balance flexibility and control.

Trade-offs for ecommerce: Decagon is cross-industry and support-led. Pricing is not published, so expect a demo and custom quote.

Ada

Ada has been automating customer service for years and now positions itself as an agentic customer experience platform. Playbooks automate complex SOPs, and Ada Computer lets agents take actions through APIs, code and MCP tools across voice, messaging and email.

Strengths: mature platform, strong compliance (HIPAA, SOC 2, GDPR, PCI DSS) and a large customer base that includes IPSY.

Trade-offs for ecommerce: Ada focuses on support resolution rather than shopping journeys, and pricing is quote-based through its sales team.

Manifest AI

Manifest AI is an agentic AI platform built only for ecommerce and retail brands. Brands use its no-code Agent Studio to build agents that work across the storefront, WhatsApp, Instagram, email and post-purchase journeys. The same agent sells (product discovery, recommendations, upsell, cart recovery) and supports (FAQs, order tracking, returns, WISMO).

Strengths:

Commerce-native: built around catalogs, carts and orders for Shopify-first brands.
Sales and support in one agent, so pre-purchase questions and post-purchase issues live in one place.
Strong on WhatsApp and Instagram, which are primary channels for many D2C brands. LEGO India runs its WhatsApp experience on BIK, Manifest AI's sister product.
Connected products: AI Voice Calling for cart recovery in multiple languages, Campaign Manager for WhatsApp, email, SMS and Instagram campaigns, an omnichannel support inbox and AI search for Shopify.
Brands report up to 90% ticket automation and conversion lifts of 20-45% from the AI shopping assistant.
500+ brands on the platform and published pricing starting at $500/month.

Trade-offs: Manifest AI is not built for banks, airlines, insurers or telecoms. If you need one agent platform across many non-commerce business units, Sierra, Decagon or Ada will fit better.

Manifest AI agent builder showing tools the agent can call — Manifest AI Agent Studio: the agent calls tools such as Shopify catalog lookup and email while it responds, with guardrails and sub-agents (test store)

Head-to-head: what matters for ecommerce

Selling vs supporting

All four platforms resolve support conversations. The difference is how much the agent is built to sell. Sierra emphasizes lifetime value and business outcomes, and Decagon customers report revenue from AI conversations. Manifest AI treats selling as a core job: the agent asks shoppers questions, recommends products from your catalog, handles upsell and recovers abandoned carts, including through AI voice calls.

Channels

Sierra has the broadest channel list, including WhatsApp and ChatGPT. Decagon and Ada cover chat or messaging, email and voice. Manifest AI covers website chat, WhatsApp, Instagram and email, with AI Voice Calling as a connected product. If Instagram DMs or WhatsApp commerce drive real revenue for you, test those flows directly with each vendor.

Time to value and who builds the agent

Sierra reports launches in weeks. Decagon's AOPs and Ada's Playbooks let business teams describe workflows in natural language. Manifest AI's Agent Studio is no-code and comes with commerce flows like order tracking and product recommendations as starting points, which helps ecommerce teams go live in about two weeks rather than months.

Instagram DM where the AI agent answers a sizing question and shares a product card (illustrative example)

Pricing and fit for mid-market

Sierra uses outcome-based pricing but does not publish rates. Decagon and Ada are quote-based. Manifest AI publishes a starting price of $500/month, offers a startup plan and a free trial, and scales to enterprise tiers. For brands with an average contract budget in the tens of thousands rather than the millions, that difference often decides the shortlist.

Security and compliance

Sierra, Decagon and Ada all publish extensive compliance information, and Sierra and Ada list certifications such as SOC 2 and PCI DSS. Manifest AI is SOC 2 and ISO 27001 certified, GDPR compliant, and runs regular third-party penetration testing (VAPT).

Why Manifest AI is the most cost-effective option

Sticker price is only part of what an AI agent costs. Per-seat and per-resolution pricing gets more expensive as conversation volume grows, and most tools leave you to build, test and maintain the agents yourself. Manifest AI is built to be the highest-ROI platform in this category: it has the lowest cost once real usage kicks in, and it includes the expert help other tools charge extra for or leave to your team.

Lowest cost at real usage. As your conversation volume grows, your cost per conversation on Manifest AI stays among the lowest in the market, so support savings and AI-driven revenue compound instead of being eaten by usage fees.
Bespoke, done-for-you agents. Our team builds all of your AI agents during onboarding, and keeps building new ones for as long as you are with us. Submit a request and we build it, so you do not need an in-house AI team or an agency.
Customer support 7 days a week. Our support team is available every day, including weekends, when ecommerce traffic and support volume often peak.
Live in about two weeks. Because we build the agents with you, most brands go live in about two weeks.

How to choose

Choose Sierra if you are a large enterprise that wants a cross-industry platform, a high-touch vendor partnership and the widest channel coverage.
Choose Decagon if you want natural-language workflow control with strong testing and QA, and you have the budget for an enterprise contract.
Choose Ada if your priority is high-volume support automation with strict compliance requirements.
Choose Manifest AI if you are an ecommerce or retail brand that wants one no-code agent to sell and support across web, WhatsApp, Instagram and email, with pricing built for mid-market and room to scale.

Whichever you pick, run a pilot on your real conversations: your top ticket types, your top pre-purchase questions and at least one full abandoned-cart journey.

Verdict

Sierra, Decagon and Ada are excellent enterprise platforms, and the gap between them is often about workflow style, compliance and vendor relationship. For ecommerce specifically, the bigger question is whether you want a support agent or a commerce agent. If revenue matters as much as resolution, Manifest AI is the option designed for that from the ground up.

FAQ

What is the difference between Sierra and Decagon?

Both build enterprise AI agents across industries. Sierra offers Agent Studio, Ghostwriter and the Horizon outcome engine with outcome-based pricing. Decagon centers on Agent Operating Procedures written in natural language, plus testing and QA tooling. Neither publishes pricing.

Is Ada good for ecommerce?

Ada is a strong support automation platform used by some consumer brands, including IPSY. It focuses on resolving support conversations rather than product discovery or cart recovery.

Which enterprise AI agent is built specifically for ecommerce?

Manifest AI is built only for ecommerce and retail. Sierra, Decagon and Ada serve many industries, with retail as one of several.

How much do enterprise AI agents cost?

Sierra, Decagon and Ada do not publish pricing and quote per customer. Manifest AI starts at $500/month with tiers up to enterprise, plus a startup plan and a free trial.

Can these AI agents handle WhatsApp?

Sierra and Manifest AI both list WhatsApp support. Decagon and Ada describe chat or messaging channels, so confirm WhatsApp specifics with them directly.

Want to see an enterprise-grade AI agent built for ecommerce? Start a free trial or book a demo with Manifest AI and test it on your own catalog and conversations.