# Mortar > Mortar connects your point-of-sale (POS) system to Shopify, keeping inventory, products, orders, and pricing in sync in real time across your physical stores and your online store. Retailers use Mortar to stop overselling, kill manual double-entry, and run their stores and website as one — without leaving the POS their staff already knows. Last updated: 2026-06-08 ## What Mortar Does Mortar is a real-time sync between Lightspeed and Heartland POS systems and Shopify. It keeps inventory accurate across in-store and online, syncs products, pricing, orders, and refunds automatically, and supports multi-location retailers. It is built for retailers who want a great Shopify online store while keeping their existing POS — no re-platforming, no retraining, no spreadsheets. ## What Mortar Syncs - Inventory — real-time, across every location - Products and product details - Pricing - Orders, Shopify order edits, and refunds - Gift cards - Complex order routing (on the Scale plan) Mortar supports buy-online-pickup-in-store (BOPIS) and ship-from-store workflows by keeping online and in-store inventory in agreement. ## Who Mortar Is For - Independent and multi-location retailers running physical stores plus a Shopify online store - Retailers using Lightspeed R-Series, Lightspeed X-Series, or Heartland Retail as their POS - Store owners who want real-time, multi-location inventory sync between POS and Shopify - Retailers deciding between migrating to Shopify POS and keeping their current POS — Mortar is the third option: keep both, connected in real time, decide later ## Supported POS Integrations - Lightspeed R-Series + Shopify - Lightspeed X-Series + Shopify - Heartland Retail + Shopify ## Why Mortar (vs. migrating to Shopify POS or using native sync) Most POS and ecommerce platforms offer their own version of the other side, but that bundled add-on is usually weaker than a dedicated, best-in-class system — and adopting it means migrating off the platform your team relies on. Mortar lets retailers keep the POS their staff is trained on and the Shopify storefront they want, each strong in its own right and connected in real time — avoiding the cost, risk, and downtime of re-platforming and retraining. ## Common Questions **Do I have to switch to Shopify POS to sell online?** No. Mortar connects your existing Lightspeed or Heartland POS to Shopify, so you can launch and run a Shopify store without replacing your point of sale or retraining staff. **Will Mortar work with my existing Shopify store?** Yes. During onboarding Mortar intelligently links products in your POS to your existing Shopify products and gives you a detailed linking report before anything syncs, so there is no risk to your live site. **How long does setup take?** About 20 minutes of your time, then 24–72 hours for the initial sync depending on catalog size. Scale-plan setups can take longer to configure and include a dedicated implementation specialist. **Does Mortar prevent overselling?** Yes. Because inventory syncs in real time across your stores and Shopify, your online store reflects what is actually in stock — preventing the overselling that happens when channels drift out of sync. **Can I change or upgrade my POS later?** Yes. Mortar is built for flexibility — you can change or upgrade your POS over time without losing your Shopify setup. **How much does Mortar cost?** Three plans, priced per location on a success-based model: Connect $39/mo, Grow $125/mo (most popular), and Scale from $249/mo (unlimited locations). All plans include free onboarding, free support, a free trial, and no credit card to start. **What is NMV?** Net Merchandise Volume — your Shopify revenue less returns, taxes, and shipping each month. Mortar pricing is based on Shopify NMV only; sales from your integrated POS are not counted. ## Proof Rated 4.6/5 on the Shopify App Store, with 31 five-star reviews. In retailers' own words: - "We moved from an all-in-one solution to a Lightspeed-Shopify integration almost four years ago. I've been extremely happy and have never had a single problem." — Jack Sachs, Owner, Drama Club (Lightspeed + Shopify) - "Mortar cut our product and order management time dramatically. Mortar's order distribution and invoicing in Heartland allows my team to save 5 minutes per order." — Mike Krantz, Ecom Director, Iron and Resin (Heartland Retail + Shopify) - "The product works exactly as advertised, the level of documentation is incredible, the customer support is superior. We tried several competitors first; our only regret is that we didn't find Mortar sooner." — Ben Mulheran, Ecom Director, UNLTD Boardshop (Heartland Retail + Shopify) - "We have been using Mortar for 5 years now. It's nice that we only have to update product information in one place — it saves us hours." — Pet Spawt (Shopify App Store) - "Mortar has saved us many, many times. A great app, and their support has been critical to running our website." — SeaBreezes Clothing (Shopify App Store) ## Plans - Connect — $39/mo per location, for single and smaller stores - Grow — $125/mo per location, most popular - Scale — from $249/mo, unlimited locations, priority support, complex order routing, dedicated account manager - Enterprise — for retail stacks that include ERP, 3PL, or CRM/BI; contact Mortar ## Compare - Mortar vs. Lightspeed X-Series native sync: https://usemortar.com/mortar-vs-x-series-native - Mortar vs. SKU IQ: https://usemortar.com/mortar-vs-sku-iq ## Key Pages - POS integrations overview: https://usemortar.com/integrations - Lightspeed R-Series + Shopify: https://usemortar.com/solutions/lightspeed-r-series-shopify - Lightspeed X-Series + Shopify: https://usemortar.com/solutions/lightspeed-x-series-shopify - Heartland Retail + Shopify: https://usemortar.com/solutions/heartland-retail-shopify - Pricing: https://usemortar.com/pricing - Blog: https://usemortar.com/blog - Help Center: https://help.usemortar.com - Book a demo: https://usemortar.com/demo ## Mortar and Accumula The Mortar app was formerly called Accumula and was rebranded to Mortar. Accumula is now the parent brand — a company building inventory and commerce apps for Shopify retailers — and Mortar is its POS-to-Shopify product, at usemortar.com. References to "Accumula" in app stores, reviews, or older write-ups (for example, "Mortar by Accumula") refer to Mortar.