Fast Simon Search & Discovery review

Fast Simon, on the Shopify App Store since February 2014, positions itself as an AI merchandising layer for search, collections and recommendations. Its model weighs shopper intent with catalog, inventory, promotions and business rules, and merchants can still pin, boost and curate products, add badges and promo tiles and set guardrails for AI shopping agents. Search handles questions, typos, SKUs and images, and the app works headless through an API, a JS SDK and Hydrogen. The Free plan includes product filters and AI instant search but only 100 monthly sessions with daily sync. Starter costs $39.99 a month for 2,000 sessions and adds custom product filters, synonyms and hourly sync; Essential at $114.99 for 10,000 sessions adds optimized collection filters and real-time sync; Pro at $299.99 for 30,000 sessions adds merchandising rules, A/B tests and visual collection merchandising. Session based pricing makes it expensive for busy stores that only need filters.

Who it is for

high traffic brands that want AI merchandising on collections

Price

Free plan for 100 monthly sessions; Starter $39.99 a month for 2,000 sessions, Essential $114.99 for 10,000.

Starter $39.99 / month or $399.96/year and save 17%
Quoted from the vendor pricing page on November 13, 2026.

Key features

• AI merchandising that orders collections without manual sorting
• Conversational AI search that handles questions, typos, SKUs and images
• Custom product filters from Starter and optimized collection filters on Essential
• Pin, boost and curate products, with badges and promo tiles
• Headless support via API, JS SDK and Hydrogen

Strengths and weaknesses

• Strength: Image search and AI shopping agent guardrails listed
• Strength: Works headless with Hydrogen, API and JS SDK
• Strength: Listing showed a 4.8 rating from 355 reviews at check time
• Weakness: The Free plan covers only 100 monthly sessions
• Weakness: Custom product filters start on Starter at $39.99 a month for 2,000 sessions
• Weakness: Merchandising rules and A/B testing need Pro at $299.99 a month

Key facts

• Free plan: Yes, 100 monthly sessions
• Paid plans: Starter $39.99, Essential $114.99, Pro $299.99 a month
• Shopify App Store rating: 4.8 from 355 reviews at check time
• Launched: February 10, 2014

Where it ranks

Fast Simon Search & Discovery is No. 7 in our Best Shopify Product Filter Apps verdict.