Mortar by Accumula

What retailers say about Mortar, the Lightspeed–Shopify integration

Mortar keeps your Lightspeed (or Heartland) POS and Shopify in sync in real time — inventory, orders, products, and customers — across every store location. Here’s what merchants think, in their own words.

4.6★
Shopify App Store
34 reviews · 91% five-star
4.8★
G2
10 reviews · Omnichannel Commerce
Start a Free TrialRead all reviews on Shopify

Mortar was formerly known as Accumula — reviews for both refer to the same product.

Verified reviews from retailers

Pulled from the Shopify App Store and G2. Every quote is from a real, verified merchant.

Shopify App Store
★★★★★
“I am so glad that I am using Mortar… Their customer service is EXCELLENT. As long as their customer service stays the same there will be no reason for me to look for another company. MORTAR is AWESOME!”
Neighbors and Co — Shopify App Store review
Shopify App Store
★★★★★
“Mortar has saved us many, many times! A great app, their support has been critical to the running of our website. Very knowledgable, pleasant to interact with.”
SeaBreezes Clothing — Shopify App Store review
Shopify App Store
★★★★★
“We have been using Mortar for 5 years now. It’s nice to know that we only have to update product information in one place (Lightspeed) — it saves us hours. I highly recommend it to anyone who needs the same functionality.”
Pet Spawt — Shopify App Store review
G2
★★★★★
“We are a chain of 11 stores who went from Lightspeed webstore to Shopify with Accumula being the connector. The whole process from onboarding to set up was faultless… highly recommend.”
Chris C., Director — G2 review
G2
★★★★★
“The product works exactly as advertised, the level of detail and documentation is incredible, the customer support is superior, and the onboarding was a breeze. Our only regret was that we didn’t make the switch sooner.”
Verified User in Sporting Goods — G2 review
Shopify App Store
★★★★★
“Mortar by Accumula is the perfect solution for me, having Lightspeed for my retail and Shopify for my ecom. They also have excellent customer service and response times.”
Jentry Kelley Cosmetics — Shopify App Store review
Shopify App Store
★★★★★
“The team at Mortar/Accumula are absolutely fantastic… The integration makes sending data between our Shopify Store and Lightspeed X-Series very smooth. Very happy customer :)”
Ivanhoe Cycles — Shopify App Store review
G2
★★★★★
“Solid solid solid, integral part of our business. The uptime and lack of issues we’ve experienced with Accumula… There are no downsides that we’ve experienced. Would recommend Accumula to anyone.”
Mike S., Business Owner — G2 review
Shopify App Store
★★★★★
“We used Accumula/Mortar for years to connect our Lightspeed and Shopify systems. We appreciated their ease of use, dependability, and their responsive help desk team.”
The Bee Supply — Shopify App Store review

Read every review for yourself

We don’t hide the full picture. Read all of Mortar’s reviews — including the critical ones — on the platforms below.

Shopify App Store

4.6 ★

34 verified merchant reviews from stores actively running Mortar.

View on Shopify

G2
Reviews

4.8 ★

Independent software reviews in the Omnichannel Commerce category.

View on G2

Common questions

Is Mortar legit?
Yes. Mortar is built by Accumula, which has been building retail integrations since 2013. It holds a 4.6-star rating across 34 reviews on the Shopify App Store and 4.8 stars on G2, with many retailers using it for multiple years.
What do retailers like most about Mortar?
Two themes dominate the reviews: real-time inventory sync that keeps the POS and Shopify accurate across locations, and a responsive support team that resolves issues quickly — often over live chat or a phone call rather than a bot.
Which POS systems does Mortar work with?
Lightspeed R-Series, Lightspeed X-Series (formerly Vend), and Heartland Retail — synced with Shopify for inventory, orders, products, and customers.
How is Mortar different from the native Lightspeed–Shopify integration or SKU IQ?
Mortar links products automatically — no manual SKU mapping — and syncs refunds, exchanges, and order edits, which the native integration and SKU IQ generally don’t handle.
How does Mortar rate as a Lightspeed–Shopify integration?
Across the two main review platforms, Mortar holds 4.6 stars on the Shopify App Store (34 reviews) and 4.8 on G2 (10 reviews). Reviewers most often cite real-time, multi-location inventory sync and responsive human support as the reasons they stay.
Is there a free trial?
Yes — Mortar offers a 14-day free trial. See usemortar.com/pricing for plan details.

See why retailers stay for years

Connect your POS and Shopify in under an hour. Most merchants are live the same day.

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Mortar vs. X-Series NativeMortar vs. SKU IQ