Shopify public app development
Public Shopify apps that earn Built for Shopify status
For founders and agencies with an app idea for the Shopify App Store, and for app owners whose listing needs the Built for Shopify badge. We design and build the app on Shopify’s Remix app template, Polaris and App Bridge, set up the billing API and the GDPR webhooks, and prepare the App Store listing for review.
Selected workAll case studies
Happy clients
Work starts within 3–5 business days of a written scope with a fixed price. You get a development store with the app installed, an update at least every 48 hours in one shared Slack channel, and a weekly call. The same senior engineers stay on it from the first call until the listing is live.
SelfServe, CartServe and UpServe, the three apps under our ServeApps label, are ones we designed, built and run on the Shopify App Store. We redesigned ReRank, an SEO app, to the same standard, and Wizship, which we built, is on the App Store. We have worked with more than 40 Shopify Plus merchants and app owners.
01What is included
What public app development includes
- 01Remix, Polaris and App BridgeBuilt on Shopify’s Remix app template with Polaris and App Bridge, so the app runs embedded in the admin and looks like the rest of it. Session tokens, OAuth and the data model come before any feature work.
- 02Built for Shopify requirementsPerformance targets for admin pages, an embedded admin without redirects, and mandatory webhooks handled and acknowledged. We check the rest of Shopify’s published list item by item before submission, the way we did for SelfServe, which carries the badge.
- 03Billing APIRecurring and usage charges through Shopify’s billing API, with a free trial, pricing tiers and upgrades handled inside the app. Merchants pay on their Shopify invoice and you are paid through Shopify.
- 04GDPR webhooks and complianceThe three mandatory GDPR webhooks (customer data request, customer redact and shop redact) implemented and verified. Every webhook gets an HMAC check, and we review what data the app stores and why.
- 05App Store listingListing copy, screenshots and the demo store Shopify’s reviewers install from, prepared before submission. We answer each round of review feedback with you until the listing is approved.
- 06Redesign of an existing appAlready on the App Store and short of the Built for Shopify badge? We audit the app against the current requirements, redesign the admin on Polaris, fix the webhooks and performance, and resubmit. ReRank went through this.
02Featured project
Shopify Payments App30 EEA countriesApp Store approved
Read the case studyPaypercut
A European payments platform that needed to sit in Shopify’s own payment list. An offsite payments extension, one-page onboarding with no webhook setup, exactly-once captures and refunds, and a pass through Shopify’s payments review.
03How a project runs
Four steps, and you can see every one of them
- 01A 30-minute callWe look through your store before the call and come with questions about what is slowing it down, so the time goes on your store and not on a pitch.
- 02A written scope with a fixed priceWhat we will build, what it costs and when it starts, on one page. Most projects start within 3–5 business days of you saying yes.
- 03Build in the openA shared Slack channel, a staging store you can click through at any point, an update at least every 48 hours and a call every week.
- 04Launch, then stay closeWe launch, watch the first weeks of data and fix what the data says to fix. Most clients keep us on for the next thing.
They said it on camera
Press play to hear themFounders and managers we worked with, in their own words.
Laura SchlaphorstProduct Owner eShop, Ryzon
Hassan FarhatFounder & CEO, Krafted
Grumspot's team successfully revamped the SEO ReRank app. The team made sure I'm kept up to date on the progress of the project at all times and were very quick to adapt any requested changes.
Mladen GrozevFounder, Meliora Web
Irakli LobjanidzeFounder & CEO, ABsolutely
Michael FenlonCMO, Nutri-Genetix
Very competent team who do the work diligently and professionally while still maintainting an agile approach to accomodating changing business needs.
Matthew WebbCTO, Top Screen Media
Andreas MüllerE-Commerce Manager, Emma & Noah
Martin HanewaldCTO, Simply Legal GmbH
We're impressed with their professionalism and quick reaction times to issues and requests.
Miroslav AntonovCo-Founder, Spoon
Danny ShislerCTO, The Floorr
Divyansh OjhaFounder & CEO, Odd Bunch
We loved working with Grumspot! They created a custom app for our Shopify checkout that fixed our address issue perfectly. Their quick and effective solution made a big difference for us. Highly recommend!
Andreas MüllerE-Commerce Manager, Emma & Noah
Grumspot were exceptionally great to work with. They always offered their best advice and were readily available. I thoroughly enjoyed working with them and highly recommend them.
Yash RanadiveFounder, RealityShop
It has been a pleasure working with Grumspot, and we are extremely satisfied with their services. Their communication was exceptional, and their meticulous attention to detail in data gathering stood out. Grumspot consistently exceeded expectations in their deliverables, completing the project on time and providing unwavering support for any questions our team had. We highly recommend Grumspot for any Shopify Plus projects and look forward to collaborating with them again in the future.
Sam CutroniCEO, DataTools
Working with Grumspot was a pleasure. They were highly professional in their communications and the final work product, even under a tight deadline.
Adam BrecklerCo-Founder and Head of Product @ Better Health
04Questions
Questions about public Shopify apps
Tell us what your store needs.
Get in touch
Send a few lines about the store and what is slowing it down. We read it, look at the store, and come back with questions and a price range.