# R3Stack

> R3Stack builds AI-powered Shopify apps for high-traffic e-commerce. Our flagship product, Cart Reserve, prevents overselling on flash sales and product drops by holding inventory the instant a shopper carts an item, blocking scalper bots with AI scoring under 200ms, and auto-releasing expired carts. Built by three engineer brothers in Brno, Czech Republic.

## Core products

- [Cart Reserve](https://r3stack.com/en/cartreserve): Shopify app that holds cart inventory in real time, blocks scalper bots with sub-200ms AI scoring, and auto-releases expired carts. Built for sneaker drops, flash sales, watch releases, streetwear, supplements, collectibles, and premium pre-orders.

## Site

- [Home](https://r3stack.com/en/): R3Stack overview — AI-powered Shopify apps for merchants running drops.
- [About](https://r3stack.com/en/about): The team, mission, and technology stack behind R3Stack.
- [Pricing](https://r3stack.com/en/pricing): Cart Reserve pricing — Starter (free, 1,000 reservations/mo), Pro ($29/mo, 10,000 reservations + AI bot protection), Max ($99/mo, 30,000 reservations + IP/country blocking). 2 months free, 14-day trial, billed via Shopify.
- [Projects](https://r3stack.com/en/projects): Selected R3Stack case studies and freelance landing-page work.
- [Integrations](https://r3stack.com/en/integrations): Integration directory — Shopify, Vercel, GitHub, Sentry, Zapier.
- [Changelog](https://r3stack.com/en/changelog): Release notes for Cart Reserve and other R3Stack products.

## Languages

R3Stack is available in English (en), Czech (cs), German (de), French (fr), and Spanish (es). Replace `/en/` with the target locale in any URL.

## Sitemap

- https://r3stack.com/sitemap.xml

## Key facts about Cart Reserve

- **What it does:** Reserves Shopify inventory the moment a shopper adds to cart; blocks scalper bots; auto-releases expired carts.
- **How fast:** Every cart-add is AI-scored in under 200ms server-side. No impact on Core Web Vitals.
- **Setup time:** ~5 minutes via the Shopify App Store. No theme code changes.
- **False positive rate:** Under 0.1% in beta; sensitivity adjustable per product.
- **Hold expiry:** Configurable (5–15 min), per-product timers supported.
- **Built for:** Sneakers, watches, streetwear, supplements, collectibles, premium pre-orders — any Shopify store running drops or flash sales.
- **Guarantees:** 2 months free trial, 14-day trial, billed through Shopify.
- **Founders:** Three engineer brothers in Brno, Czechia.

## Contact

- Shopify App Store: https://apps.shopify.com/cart-reserve
- Website: https://r3stack.com