Shopify
Can Sidekick Actually Build a Custom Shopify App? We Tested It
We tested whether Shopify’s Sidekick AI can build a working custom app from scratch. Here’s exactly what it...
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When off-the-shelf apps are not enough, we build exactly what you need
Custom Shopify Apps Built for Your Business
From private apps and public App Store listings to Admin API integrations and automation pipelines: UpSolite builds Shopify functionality that you own, control, and scale on your terms.
30+Custom Apps Built
7+Years Shopify
5★Avg Rating
Trusted by growing Shopify brands
What we build
Every type of custom Shopify app, engineered from the ground up
From lightweight Admin extensions to full-stack public apps and automation pipelines, UpSolite covers every layer of Shopify's extensibility platform with production-ready code that you own.
Subscription Portals
Recharge-native custom UIs that give subscribers full control: skip, swap, pause, or cancel without third-party portal redirects. Branded, fast, and embedded in your storefront.
Loyalty and Rewards Apps
Purpose-built loyalty systems tied to your CRM or points engine. Custom earning rules, reward redemption flows, and customer-facing dashboards that generic apps cannot replicate.
B2B Self-Service Portals
Wholesale and B2B account portals with custom pricing tiers, order history, net-term management, and company-level permissions built natively on Shopify's B2B APIs.
Inventory and Fulfilment Automation
Event-driven automation that routes orders, triggers restock alerts, syncs warehouse systems, and generates fulfilment tasks, removing manual steps across your operations.
Custom Reporting Dashboards
Admin-embedded reporting tools that surface the metrics your team actually needs: sales velocity, subscription health, B2B account performance, and fulfilment SLAs updated in real time.
ERP and Third-Party Sync
Bi-directional data pipelines between Shopify and your ERP, CRM, or WMS. Orders, inventory, customers, and financials stay in sync with retry logic and monitoring built in.
Our tech stack
Built with the tools that Shopify was designed for
We use the official Shopify developer toolkit: Remix, Polaris, App Bridge, GraphQL, and the Admin API, so your custom app stays aligned with Shopify's roadmap and performance standards.
React
Node.js
GraphQL
Shopify Admin API
Webhooks
Shopify CLI
Polaris
Remix
REST API
App Bridge
PostgreSQL
Redis
30+
Custom apps delivered
Why go custom
Off-the-shelf covers 80%. We build the 20% that matters most.
The features that differentiate your brand, the ones that make customers stay, operations scale, and revenue grow, are rarely available in any app store. That is exactly what UpSolite builds.
- You own the code and the roadmap: No vendor lock-in, no monthly per-store licensing fees, and no waiting on an app developer's release schedule. Your app evolves exactly when and how your business needs it to.
- Logic built to match your workflows: Off-the-shelf apps force you to adapt your operations to their limitations. A custom app is built around your existing workflows, so your team does not have to change how they work.
- Better performance, zero app bloat: Generic apps load scripts, assets, and features you will never use. A custom app ships only what you need: faster storefronts, a lighter admin, and cleaner data across every system.
- Native integration with your entire stack: Custom apps connect directly to your ERP, CRM, 3PL, or internal database, not through fragile third-party connectors. One handshake, built right, maintained by a single team.
Our development process
Scoped before coded. Documented on delivery.
Every custom app project starts with a written spec and ends with a handover pack. No black boxes, no vendor lock-in.
01
Discovery & Scoping
We map your workflows, document the integration points, and define the data flows. You get a written spec before we write a single line of code.
Week 1
02
Architecture
We design the app architecture using Shopify's official extension points: Admin API, webhooks, Checkout Extensions, or App Bridge. No unsupported workarounds.
Week 1–2
03
Build & Test
We build in sprints with regular demo calls, staging access, and full QA including load testing and edge case coverage before any production deployment.
Week 2–7
04
Deploy & Support
We deploy to production, monitor the first week of live usage, hand over full source code, and offer ongoing support so your team is never blocked.
Week 7–8
Custom apps in practice
Woxer · Shopify Plus
Custom Recharge Subscription Portal & Global Offer Engine
We built Woxer a fully branded subscription management portal on Recharge's Storefront API, replacing their generic portal redirect with a fully embedded storefront experience. Subscribers can skip, swap, pause, or cancel without leaving the site. We also built a single global offer engine replacing three separate promo apps — handling BOGO rules, tiered discounts, and gift-with-purchase logic from one place.
Custom sub portal
3 promo apps replaced
Offer engine built
View Case Study ↗
Absolute Dogs · Shopify
Custom App: Auto-Tag Access & 30-Day Cancellation Grace Period
Absolute Dogs sells dog training courses and memberships. Managing access tags manually as customers bought, upgraded, or cancelled was unworkable at scale. We built a custom Shopify app using webhooks and the Admin API to auto-tag customers on purchase, granting instant course access — and automatically removing access 30 days after a subscription cancels, like a streaming-service grace period, with zero staff involvement.
Auto-tag on purchase
30-day grace period
Webhooks + Admin API
View Case Study ↗
What our clients say
Trusted by growing Shopify brands around the world
RF
Rafael Rosas
Operations Manager, Woxer
★
★
★
★
★
"We’ve had a great experience working with this ecommerce agency. The team is professional, responsive, and highly skilled in development. They understood our requirements quickly and delivered high-quality work that improved both the functionality and performance of our store. Highly recommended for anyone looking for a strong ecommerce development team."
ML
Michel Lupo
CEO & Founder, Flewd
★
★
★
★
★
"They've helped out with emergency fast fixing and full rebuilds of high-traffic e-commerce brands without ever an issue - they match submitted designs and never deliver with any bugs. They're also incredibly affordable for small, independent businesses. Highly recommend this team and have passed them to work with several colleagues."
KE
Kevin Elliott
Marketing Lead, Bake Me Healthy
★
★
★
★
★
"UpSolite is my go to agency anytime I need development work or programing on my Shopify site. Working with them has been a great experience. I can explain what I want in simple terms and they take it and quickly make it happen. Every time their solutions worked exactly how I wanted and communication along the way was professional. They even handled in couple emergency requested in record time. I recommend UpSolite and continue to use them for my business."
From Our Insights
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Ready to build your app?
Tell us what you need. We'll build exactly that.
Book a free 30-minute scoping call. We'll review your requirements, recommend the right app architecture, and outline what we'd build, with no obligation and no pitch.