ShopAI Assistant vs Sigma ‑ AI Shopping Assistant
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 14, 2026 for ShopAI Assistant, Sep 3, 2026 for Sigma.
The short answer
- Only ShopAI Assistant lists a free plan.
- Sigma lists 7 features ShopAI Assistant’s listing doesn’t mention, including Agent analytics, Agent avatar, Chat flows.
Head to head
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Free
- · 100 AI messages/month
- · Add to cart & checkout in chat
- · Basic analytics
- · Multi-language support
- · Product search & variant selection
- · Real-time inventory tracking
Starter
- · 500 AI messages/month
- · All free features included
- · Live chat support
- · Order tracking in chat
- · Up to 20 FAQs
- · Up to 500 products
Growth
- · 2,000 AI messages/month
- · All starter features included
- · Lead generation support
- · Smart reorder suggestions
- · Up to 1,000 products
- · Up to 50 FAQs
Pro
- · 5,000 AI messages/month
- · AI-driven rules and workflows
- · Advanced AI conversations
- · All growth features included
- · Priority support
- · Trigger-based automations
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureShopAI Assistant transforms e-commerce with intelligent automation. Shoppers get 24/7 AI support to search products, select variants, and checkout instantly. Live agent chat stands by for complex queries. Beyond sales, it captures leads and automates workflows with AI-driven rules.
Sigma AI is your always-on AI shopping assistant that helps customers find products, track orders, and checkout faster. Unlike basic chatbots, it understands your entire product catalog and delivers personalized recommendations through natural conversation. Customers ask questions like "show me gifts under $50" and get instant product cards with images, prices, and one-click add-to-cart.
- Natural product search using customer-friendly chat
- Easily select size, color, and variants in chat
- Send pre-filled Shopify checkout links instantly
- Add or remove products from cart through chat
- Smart product discovery - customers find products using natural language
- 24/7 automated support - answers questions about products and policies
- Conversation analytics and revenue attribution dashboard
All the numbers
Every figure, side by side
A green dot marks the app ahead on a measured figure. Estimates, gaps and apps that leave no storefront trace never take the lead.
Adoption
| Measure |  ShopAI Assistant |  Sigma |
|---|---|---|
| Detected stores | Not published | Not published |
| Net store change, 28 days | 0 | 0 |
| Stores added, 28 days | Not enough data | Not enough data |
| Big-brand share | Not enough data | Not enough data |
| Top store categories | Not published | Not published |
| Top store countries | Not published | Not published |
Reviews
| Measure | ShopAI Assistant | Sigma |
|---|---|---|
| App Store rating | 5.0 ★ | Not published |
| App Store reviews | 2 | Not published |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | ShopAI Assistant | Sigma |
|---|---|---|
| Free plan | Yes | Not listed |
| Lowest paid monthly plan | $9/month | No monthly plan listed |
| Longest free trial | Not listed | Not listed |
| Plans listed | 4 | Not published |
Listing
| Measure | ShopAI Assistant | Sigma |
|---|---|---|
| Shopify category rank | #476 | Not enough data |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Jul 24, 2025 | Jan 13, 2026 |
| Languages | 1 | 1 |
| Developer | Webewox | MerchantAI |
FAQ
ShopAI Assistant and Sigma: common questions
- Is ShopAI Assistant or Sigma cheaper?
- Only ShopAI Assistant lists a free plan. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- What features does each app list that the other doesn’t?
- ShopAI Assistant lists 4 the others don’t mention, such as Chat buttons, Chat window, Multi-language, Quick replies. Sigma lists 7 the others don’t mention, such as Agent analytics, Agent avatar, Chat flows, Cross-sell. A feature missing from a listing may still be supported; this compares what each App Store listing says.
- Where does this comparison’s data come from?
- Shoplist crawls Shopify storefronts to detect which apps each store runs, and reads each app’s Shopify App Store listing for reviews, pricing, features and integrations. Store counts are as of Oct 14, 2026 for ShopAI Assistant, Sep 3, 2026 for Sigma; estimated figures are labeled.
How Shoplist compares apps
Store counts come from Shoplist’s crawl of Shopify storefronts, which detects the apps each store runs; they are as of Oct 14, 2026 for ShopAI Assistant, Sep 3, 2026 for Sigma. Reviews, ratings, plans, features and integrations come from each app’s Shopify App Store listing. 28-day figures are labeled when estimated, and a figure that is missing or estimated never decides who leads. Read the methodology.