Fast Simon AI Search & Filters

Maximize your store sales & ROI with this easy-to-install app.

by Fast Simon · Launched: February 2014 · Free plan available.

4.8 (353) on Shopify Used by 2,321 Shopify stores

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About Fast Simon AI Search & Filters

We're passionate about delivering a cutting-edge eCommerce experience for our clients. That's why we've developed a revolutionary platform that integrates shopper behavior, store signals, and agentic AI to help you optimize your merchandising, navigation, search filters & AI shopping agents. Fast Simon powers shopping optimization through NO-CODE front end, API, JS SDK, REACT Components and Hydrogen. Let us help you take your eCommerce business to the next level.

Last verified: September 19, 2026 · Fresh

App details

Developer: Fast Simon
Category: Store design
Pricing: Free plan available
Launched: February 2014
Rating: 4.8 (353) on Shopify

Key features

100 Monthly Sessions
Search product Filters
AI-based Instant Search & AutoComplete
Typo & Auto-Correction
No-Code editor- configure the experience

Integrations with:

Checkout Klaviyo Langify Okendo Stamped.io TapCart Yotpo

4 plans · starts free · 14-day free trial

Free to install

Free

Starter

$39.99/month

Essential

$99.99/month

Top Pro

$299.99/month

Plans and prices as listed on the Shopify App Store.

Ratings & reviews

based on 100 Shopify App Store reviews

Use the arrows to read individual reviews

FAST SIMON is very easy to use, but really powerful solution for merchants to improve Search System. It covers not only product search but do help boost CRM and SEO too. The help center is very professional. I recommend it.

— andar JAPAN

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— Quick Candles

I've worked with Fast Simon for years and it is very user friendly! They are constantly making improvements and updates to the apo, Our CS Manager and their dev team respond so quickly to any issues that arise.

— St. John Knits

Best customization out of every search results page app I've used. support team is experienced and act fast with no let downs very professional. i hope i can get qualify for their new features one day. it doesn't get better this i've tried every single search results page on the Shopify app store. this one is unbeatable.

— Astricate

Their support is excellent!

— La Canadienne

Exceptional support and technical expertise. Whenever I have requested help, I receive prompt support and always a resolution - first time. Highly recommend!

— Cerqular Hong Kong

The app is great, the customer service is great, and the developers are always willing to help!

— Shani Jacobi Jewelry

Great customer service! When we had a problem, the tech staff was accommodating. I would recommend this app.

— Inked Shop

very happy with the app and support, with a recent google core updates and a need for shopify to be fast was a challenging. Fast simon offering side rendering on collection page has speed up our score in page speed insight, we are very happy with the app

— Bathroom Store

An awesome app for search and collection management! The tools and information this app provides has helped our conversions and merchandising tremendously. The support team has been very helpful along every step of the process. If we ever need anything, we can always count on them to help us out!

— 707 Street

The Fast Simon team is always quick with a response. They will always find and provide the solution. I highly recommend this app.

— DUMBGOOD

Rest API is not consistent, if you are planning to use for iOS and Android app then it is not worth.

— Kitchen Switchen

Really loved this app to begin with, but recently became disappointed in a few things that led me to cancel. Firstly, the sudden price increase - from $140/yr to $400/year?! - for the same level of features. Once it expired, the regular search functionality was disabled/broken on my website. I lost a lot of business over the weekend because no one could search my products. Their customer support r...

— Claire W Design

I did not fully explore the app but find the demand for customer geo-location data on sign up, unacceptable. There is no reason for this app to have that information, why do they need to know a 10 digit grid for my customers - I don't need to know it so why do they make this a condition of using their app?

— ukeod

Would NOT recommend. This app ads code to your site that takes developer support to delete. Bad business! Subpar customer service and the functionality is really bad. The look and feel is not responsive either.

— Halberstadt's Bismarck

Looks terrible on the site and when you try to delete the app, it leaves code on the site so it breaks other apps.

— Halberstadt’s on Broadway

This app didn't work initially and required a set up working with our website theme. The support suggested "contact your web developer or theme provider to further guide you on".

— Cymbal House

Instant Search+ appears to be a great app. It checks all the boxes for what I need for customers to find the items that they are looking for on my website. However, I do find the initial installation support extremely lacking. I have spent many hours trying to configure the app without much success. I have reached out to support several times, and get directed back to the same product documentatio...

— from Kicks to Kids

Have utilized this app for two years now. Staff is friendly and quick to assist. Very nice app, however the metric used for billing is number of monthly users visiting your website. For smaller stores this should never become an issue, however as you grow - especially if you have a large number of pages or products in your store, the Google bots will utilize many of the visits. Out store has an...

— Wallhogs

Beware of giving access to modify theme files - their 'update' disrupted our recent SEO project. Had no idea of their modification in theme.liquid til i noticed it

— Lizzyjames

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