Building a custom Shopify app that doesn’t break during the next sale or turn into a support nightmare is hard. Most agencies talk a big game, but only a handful consistently ship apps that merchants keep for years, scale without drama, and actually move the needle on revenue. After digging through hundreds of case studies, merchant reviews, Clutch reports, and private Slack channels, these are the agencies that keep coming up when store owners talk about who they’d hire again in a heartbeat. No fluff, no paid placements-just the teams that get it done.
Extuitive – AI That Builds & Validates Shopify Ads in Minutes
We built Extuitive to fix the part of Shopify growth that always felt slow and risky - figuring out which ads and product ideas actually work before spending real money. Our platform connects straight to a merchant’s store, pulls product data, and lets AI agents (trained on real consumer behavior) generate dozens of ad variations, reels, copy lines, and even pricing tests in minutes. Those agents then simulate how real people react, score everything for purchase intent, and surface only the creatives that consistently win.
Once the winners are picked, our app pushes the approved ads directly to Meta, TikTok, or wherever the store runs traffic, and keep tracking performance so adjustments happen fast. Merchants go from blank page to validated, launch-ready creative without hiring agencies or burning budget on flops. It’s the kind of loop that used to take weeks of focus groups and test spends - now it’s just a few clicks and the AI does the heavy lifting.
1. Kozak Group
These guys are based in Kraków and they just get it. They’ll hop on a call, listen to the dumb little workflow that’s been driving everyone nuts for months, and build something that actually fixes it without turning the admin into a science project. Nothing flashy, just clean code that doesn’t break when you suddenly do 10× volume. Merchants keep them on retainer because the apps still work two years later. That’s rare.
Key Highlights:
- Focus on custom features tailored to streamline routines
- Emphasis on seamless ties with existing tools and services
- Design prioritizes ease of use for both merchants and customers
- Scalability built in to manage rising demands
- Regular updates and issue resolution post-launch
- Open lines for progress checks and input
Services:
- Custom app creation for unique business requirements
- Development of public and private apps
- Integration with payment systems and marketing platforms
- Migration and upgrades to newer versions
- Continuous maintenance and performance tweaks
Contact Information:
- Website: kozak-group.com
- Phone: +380987568230
- Email: info@kozak-group.com
- Address: Ul. Długa 74/5, 31-147 Kraków
- LinkedIn: www.linkedin.com/company/kozak-group
- Facebook: www.facebook.com/Kozak.group
- Instagram: www.instagram.com/kozak.group
2. Voodoo Digital
Voodoo Digital dives into Shopify app work by starting with a solid grasp of what the store already does, then layering in custom elements that extend its reach. Public apps get shaped for wider availability, optimized across devices so shopping feels consistent whether on phone or desktop. Private builds zero in on internal perks, like sharper order handling or targeted campaigns that speak directly to customer segments. Third-party links, say to tools for email or CRM, pull everything together without forcing awkward workarounds.
The workflow kicks off with mapping out needs, sketching timelines, and setting clear markers for each phase. Development follows with code that’s clean and adaptable, wrapping up in guided walkthroughs to ensure smooth handover. QA checks happen twice over, catching snags before they linger. It’s a methodical path that balances speed with steadiness, letting the app slot in and start pulling its weight right away.
Key Highlights:
- Architecture geared toward expansion and device compatibility
- Collaborative mapping of requirements early on
- Structured phases from design to deployment
- Double-layer testing to minimize post-launch fixes
- Guidance on updates and usage after go-live
- Data-informed tweaks for better functionality
Services:
- Public app development for app store listing
- Custom private apps for exclusive store features
- Integrations with external providers like email tools
- Store optimization and performance audits
- UI/UX refinements for intuitive interfaces
Contact Information:
- Website: voodoo-digital.com
- Email: hello@voodoo-digital.com
- LinkedIn: www.linkedin.com/company/voodooecom
- Instagram: www.instagram.com/voodooecom.agency.ua
3. Web-Systems Solutions
Web-Systems Solutions approaches Shopify app creation by weighing the gap between core platform limits and specific store demands, leading to either private tweaks or public releases. Private apps fill in those custom spots, honing in on tasks like inventory tweaks or customer flow adjustments. Public ones tap into the broader ecosystem, opening doors to monetization through features that other stores might pick up. The decision on which route hinges on whether the goal stays internal or branches out.
Building starts with pinning down the app’s role, then moves through coding and testing to a full launch. Previews and cases show how these apps configure elements like product displays or operational dashboards. It’s a straightforward build that keeps the focus on solving real workflow kinks, with an eye on how the app might evolve as the platform does.
Key Highlights:
- Differentiation between private and public app paths
- Initial assessment to match app type to business fit
- Full-cycle from concept to deployment
- Examples include configurator tools for previews
- Alignment with ecosystem growth for ongoing relevance
- Revenue angles for public offerings via promotions
Services:
- Private app development for tailored functionality
- Public app builds for marketplace access
- Core expansions beyond standard platform tools
- Operational enhancements like order and inventory management
- Launch support including approval navigation
Contact Information:
- Website: web-systems.solutions
- Phone: +38 (067) 980-09-00
- Email: info@web-systems.solutions
- Address: Ukraine, Khmelnytskyi, Kamyanetska 137 St.
- LinkedIn: www.linkedin.com/company/wss-design
- Facebook: www.facebook.com/websystems.solutions
- Instagram: www.instagram.com/web_systems
4. Amasty
Amasty takes on Shopify app projects by spotting the gaps that ready-made apps leave open and filling them with made-to-measure solutions. Builds cover everything from order management and inventory tracking to marketing tools and B2B-specific functions. Third-party connections get wired in cleanly, while the interface stays uncluttered so daily use doesn’t feel like a chore.
The process runs in four defined stages - consultation to nail down requirements, actual development with room for tweaks, thorough testing, and finally release with follow-up support. Merchants stay in the loop throughout, seeing progress and giving feedback before anything goes live. Once launched, help remains available for questions or later adjustments.
Key Highlights:
- Step-by-step workflow with clear merchant involvement
- Coverage of design, customer care, and marketing features
- Transparent testing phase before final rollout
- Post-release availability for support and fixes
- Focus on fitting unique business specifics
Services:
- Custom app development for any complexity
- Third-party system integrations
- B2B functionality additions
- Order and inventory management solutions
- Marketing and customer-care enhancements
Contact Information:
- Website: amasty.com
- Phone: +1 347 897 9078
- Email: support@amasty.com
- LinkedIn: www.linkedin.com/company/amasty
- Facebook: www.facebook.com/Amasty.Ltd
- Twitter: x.com/AmastyTeam
5. DigitalSuits
DigitalSuits works on Shopify apps by figuring out where standard features fall short and building additions that actually match daily operations. Private apps get shaped around specific store quirks, while public ones go through the full submission routine to land in the app store. Headless setups pop up when merchants want more freedom on the frontend, and third-party tools like review platforms or email systems get hooked in without creating chaos.
Maintenance sticks around after launch, covering updates and migrations when the platform shifts. UI decisions lean toward clarity so merchants don’t waste time hunting for controls. The whole thing moves from initial chats about needs to final deployment, with tweaks along the way if something doesn’t line up right.
Key Highlights:
- Handles both private and public app paths
- Offers headless commerce when flexibility matters
- Ties in common third-party services smoothly
- Keeps apps running through upgrades and changes
- Designs interfaces that prioritize quick understanding
- Supports submission process for public listings
Services:
- Custom private app creation
- Public app development and store submission
- Third-party integrations with review and email tools
- Headless Shopify implementations
- Ongoing maintenance and migration help
- UI/UX focused on merchant ease
Contact Information:
- Website: digitalsuits.co
- Phone: (512) 571-3557
- Email: hello@digitalsuits.co
- Address: 5 W 36th St, New York, NY 10018
- LinkedIn: www.linkedin.com/company/digitalsuits
- Facebook: www.facebook.com/DigitalSuitsSoftwareDevelopment
- Instagram: www.instagram.com/digitalsuits
6. Sunrise Integration
Sunrise Integration puts together Shopify apps starting with research into who will actually use them and what problems they solve for merchants. Strategy sessions map out competitors and sketch prototypes before any code gets written. Development uses current Shopify APIs and UI extensions, with hosting handled on AWS for apps that need solid uptime and scaling.
Getting apps approved in the store is part of the deal - they navigate the requirements so listings go live without endless back-and-forth. After launch, monthly retainers cover updates as Shopify rolls out new features. Brands end up with tools ranging from shipping calculators to live-video shopping embedded right in the checkout flow.
Key Highlights:
- Starts with detailed strategy and prototype work
- Manages enterprise-level hosting on AWS
- Guides apps through store approval process
- Provides flexible monthly support packages
- Builds everything from carrier services to POS extensions
- Keeps apps current with platform changes
Services:
- Full-cycle public and custom app development
- Strategy consulting and competitor analysis
- Embedded apps with custom UI extensions
- App store submission and approval handling
- Ongoing maintenance and feature updates
- Hosting and scalability management
Contact Information:
- Website: www.sunriseintegration.com
- Phone: 800.841.3130
- Email: hello@sunriseintegration.com
- LinkedIn: www.linkedin.com/company/sunrise-integration
- Facebook: www.facebook.com/sunriseintegration
- Twitter: x.com/sun_integration
- Instagram: www.instagram.com/sunriseintegration
7. Deveit
Deveit tackles Shopify app projects by digging into existing workflows first, then crafting tools that shave off repetitive steps. Private apps stay locked to one store, while public versions get prepped for the broader marketplace. Integrations with CRMs, ERPs, or shipping carriers happen through stable connections that don’t break during busy periods.
Interfaces come out clean and logical, especially when merchants interact with them daily. Speed audits and device testing make sure nothing lags when traffic spikes. The process runs from requirement chats and wireframes through to launch, with support hanging around afterward for fixes or new requests.
Key Highlights:
- Builds tools that mirror internal processes
- Covers both public launches and private tools
- Focuses on stable third-party API connections
- Designs merchant-facing screens for quick onboarding
- Tests across devices and real-world scenarios
- Stays available for post-launch adjustments
Services:
- Custom tool development for specific workflows
- Public and private app creation
- Third-party API integrations with business systems
- UI/UX design for merchant dashboards
- Performance optimization and scaling prep
- Launch assistance and continued support
Contact Information:
- Website: deveit.com
- Phone: +48 725 814 408
- Email: sales@deveit.com
- LinkedIn: www.linkedin.com/company/deveit
- Facebook: www.facebook.com/DeveitCompany
- Instagram: www.instagram.com/deveitcompany
8. cmsMinds
cmsMinds approaches Shopify app work by listening to what merchants actually struggle with, then building features that cut down manual tasks. Custom apps get wired into payment gateways, analytics tools, or marketing platforms so everything talks to each other without hiccups. Migration from other platforms happens with an eye on keeping data intact and downtime short.
Optimization rounds focus on load times and usability so customers don’t bounce. Support continues after go-live, handling updates when Shopify pushes changes. The flow moves from goal-setting calls to design, coding, testing, and finally handing over a finished app that fits the store like it was always there.
Key Highlights:
- Ties apps into common payment and analytics services
- Handles migrations while preserving existing data
- Runs performance tuning for faster load times
- Offers ongoing monitoring and updates
- Keeps merchants in the loop at every milestone
- Tests thoroughly before final delivery
Services:
- Custom Shopify app development
- Third-party tool and API integration
- App migration from other platforms
- Performance optimization and tuning
- Consulting on feature planning
- Continuous support and maintenance
Contact Information:
- Website: cmsminds.com
- Phone: +1 (919) 694-8000
- Address: 8404 Six Fork Road, Suite 204B Raleigh, NC 27615
- LinkedIn: www.linkedin.com/company/cmsminds
- Facebook: www.facebook.com/cmsminds
- Twitter: x.com/cmsminds
9. MakeBeCool
MakeBeCool jumps into Shopify app projects by treating each merchant like a real partner, digging deep into the business to figure out what actually needs fixing. Private apps get built to handle exact pain points, while public ones - like their Smart Bundle app - end up in the store helping merchants push bundles that add items straight to carts without weird workarounds. Migration work keeps all the old data safe, from orders to customer history, so nothing vanishes during the switch.
The process stays pretty collaborative: goals get hashed out upfront, questions fly back and forth until the real needs surface, then the code gets written and handed over. Support doesn’t vanish after launch - tweaks and questions still get answered. It’s the kind of setup where the app ends up feeling like it was built in-house instead of by some outside crew.
Key Highlights:
- Treats projects as partnerships with heavy upfront discussion
- Handles full migrations while preserving data
- Builds both private tools and public store-listed apps
- Keeps communication flowing after delivery
- Focuses on solutions that match exact business logic
- Offers ongoing help when new needs pop up
Services:
- Custom private app development
- Public app creation and store submission
- Data migration to Shopify
- Bundle and sales-boosting features
- Post-launch adjustments and support
- Roadmap planning tied to business goals
Contact Information:
- Website: www.makebecool.com
- Phone: +38 067 317-02-74
- Email: opening@makebecool.com
- Address: Harju maakond, Tallinn, Kesklinna linnaosa, Kaupmehe tn 7-120, 10114
- Facebook: www.facebook.com/MakeBeCool
10. Swanky Agency
Swanky Agency focuses on custom Shopify apps that usually end up doing something a bit different from what’s already out there, whether it’s a new twist on mobile shopping or a browser tool merchants actually enjoy using. The whole cycle runs from first chats about whether the idea even fits Shopify through to keeping the app updated once it’s live and seeing real traffic.
Everything stays rooted in what the data says and what actually moves the needle for the store. Merchants end up with apps that feel built around their customers rather than forcing customers to adapt. Maintenance rolls on afterward so the app doesn’t break the next time Shopify pushes an update.
Key Highlights:
- End-to-end from idea check to long-term upkeep
- Heavy emphasis on data-driven decisions
- Builds both mobile and browser-based apps
- Keeps commercial impact in focus
- Handles ongoing enhancements after launch
- Centers design around customer behavior
Services:
- Bespoke app development for unique experiences
- Platform suitability consultations
- Full-cycle design and deployment
- Post-launch maintenance and feature adds
- Customer-focused functionality tweaks
- Regular updates tied to platform changes
Contact Information:
- Website: swankyagency.com
- Phone: +44 (0) 1392 92 70 70
- Email: humans@swankyagency.com
- Address: Swanky, 19 Southernhay West, Exeter, EX1 1PJ
- LinkedIn: www.linkedin.com/company/swankyagency
- Facebook: www.facebook.com/swankyHQ
- Twitter: x.com/swankyagency
- Instagram: www.instagram.com/swankyagency
11. GenovaWebArt
GenovaWebArt starts every Shopify app job by poking around the merchant’s actual processes - orders, inventory, whatever hurts the most - then builds tools that quietly fix those spots. Custom functionality shows up in themes where it makes sense, integrations reach from local carriers to heavy ERP systems, and subscription setups get extra logic when the default ones fall short. Shopify Plus features get used when the store needs that extra room.
The workflow moves through kickoff calls, research, prototypes, and a proper testing round before anything goes live. Support sticks around afterward for new features or when the store outgrows the first version. A lot of the apps end up handling complex back-end tasks while staying simple on the front.
Key Highlights:
- Deep dive into existing business processes first
- Covers simple carrier links to full ERP connections
- Handles custom subscription logic
- Runs structured stages from discovery to measurement
- Offers continuing support for evolving needs
- Builds for both startup and corporate scale
Services:
- Custom feature additions across Shopify APIs
- Third-party integrations of varying complexity
- Subscription system enhancements
- Shopify Plus-specific tools
- Theme-level custom functionality
- Post-launch updates and troubleshooting
Contact Information:
- Website: genovawebart.com
- Phone: +38 099-670-7548
- Email: info@genovawebart.com
- LinkedIn: www.linkedin.com/company/genovawebart
12. Folio3
Folio3 takes on Shopify app work by zeroing in on the exact workflow gaps that off-the-shelf apps can’t touch - weird pricing rules, niche bundling setups, custom checkouts, whatever the store actually needs. Solutions get built to slide in without breaking anything else, and scaling stays baked in from the start so traffic spikes don’t turn into headaches.
The scope covers everything from private tools only one store uses to public apps meant for wider reach. Consultation up front figures out what will actually move the needle, then the build follows. Maintenance and extra features come later as the business shifts.
Key Highlights:
- Targets very specific workflow problems
- Designs for clean integration from day one
- Handles both private and public app routes
- Keeps scaling in mind during initial build
- Offers consultation to match features to goals
- Continues with support after initial rollout
Services:
- Custom app creation for unique requirements
- Conversion-focused feature development
- Private and public app builds
- Dynamic pricing and bundling tools
- Checkout flow customizations
- Ongoing scaling and adjustment help
Contact Information:
- Website: ecommerce.folio3.com
- Phone: +1 408 365 4638
- Email: ecommerce@folio3.com
- Address: 160 Bovet Road, Suite # 101, San Mateo, CA 94402 USA
- LinkedIn: www.linkedin.com/company/folio3
- Facebook: www.facebook.com/folio3software
- Twitter: x.com/folio_3
13. Absolute Design
Absolute Design tackles Shopify app projects when a store needs something the usual themes or apps just don’t cover. Back-end features get added to handle tricky workflows, while front-end tweaks make the customer side feel smoother. Connections to outside services like review platforms or search tools happen without forcing merchants to juggle separate logins.
Admin dashboards often come out of these builds, giving stores a clearer view of stock, orders, or customer patterns in one spot. The whole thing stays focused on making daily operations less of a grind and giving shoppers a cleaner experience. Updates and small fixes keep rolling in after the app goes live so nothing breaks when Shopify changes something under the hood.
Key Highlights:
- Creates back-end tools for complex workflows
- Builds custom admin panels for better oversight
- Hooks up third-party services cleanly
- Adds front-end polish for shoppers
- Keeps apps working through platform updates
- Simplifies tasks that usually take manual effort
Services:
- Bespoke app creation from scratch
- Custom API connections to external platforms
- Enhanced admin dashboards
- Inventory and order tracking features
- Customer-facing functionality upgrades
- Ongoing tweaks and compatibility fixes
Contact Information:
- Website: www.absolute-design.co.uk
- Phone: 0115 953 4800
- Email: info@absolute-design.co.uk
- Address: Cowshed 1, Blackford Bridge Farm, Longhedge Lane, Sibthorpe, Nottinghamshire, NG23 5PN
- LinkedIn: www.linkedin.com/company/absolute-design_2
- Facebook: www.facebook.com/absolutecreative
14. Hornet Dynamics
Hornet Dynamics approaches Shopify apps by looking at what the store actually needs to run smoother, then coding solutions that slot in without drama. Mobile responsiveness stays front and center since most shoppers browse on phones now. Embedded apps get built when merchants want controls right inside the usual Shopify screens.
Multi-store setups and different languages get handled when a business sells across borders. Migration work moves old data over cleanly, and performance tuning keeps pages loading fast even during sales spikes. Support sticks around afterward for quick fixes or new feature requests that pop up once the store starts growing.
Key Highlights:
- Prioritizes mobile-friendly design from the start
- Handles multi-store and multi-language needs
- Focuses on speed and SEO improvements
- Offers data migration without losing rankings
- Builds embedded apps for native feel
- Provides ongoing maintenance packages
Services:
- Custom app development
- Third-party API connections
- Mobile and responsive solutions
- Performance and SEO optimization
- Data migration services
- Multi-store configuration
Contact Information:
- Website: hornetdynamics.com
- Phone: +91-9694666667
- Email: info@hornetdynamics.com
- Address: Ridhi Sidhi, King Street SL Marg, Jawahar Lal Nehru Marg, Malviya Nagar, Jaipur
- LinkedIn: www.linkedin.com/in/hornet-dynamics-pvt-ltd
- Facebook: www.facebook.com/hornet.dynamics1
- Twitter: x.com/DynamicsHo93265
- Instagram: www.instagram.com/hornet_dynamics
15. Innowise
Big team, multiple offices, can throw bodies at a problem if you need something yesterday. They’ll build literally anything - public apps, random plugins, full storefronts from scratch. Quality varies a bit depending on who you get, but when they’re good, they’re really good.
Key Highlights:
- Covers both public and private app routes
- Handles full store builds when needed
- Connects to external systems via APIs
- Runs migration with minimal interruption
- Tests thoroughly before launch
- Offers theme customization on the side
Services:
- Custom and public app creation
- Plugin development for the app store
- Theme design and optimization
- Store setup from scratch
- API integration work
- Migration and customization help
Contact Information:
- Website: innowise.com
- Phone: +1 917 267 7727
- Email: contact@innowise.com
- Address: St. Petersburg, FL 33702, 7901 4th St N STE 300
- LinkedIn: www.linkedin.com/company/innowise-group
- Twitter: x.com/innowisegroup
16. Brainvire
Brainvire takes on Shopify app jobs by mapping out exactly where a store loses sales or wastes time, then building tools that plug those holes. Headless setups appear when merchants want a completely different front end, and checkout extensions show up for Plus stores that need unique final steps. B2B features get layered in when wholesale buyers need separate pricing or order rules.
Marketing automation hooks connect straight to email or ad platforms so campaigns run themselves. Dropshipping flows get streamlined with supplier syncs that cut out manual order copying. Support continues long after launch, handling security patches and whatever new ideas surface once the numbers start rolling in.
Key Highlights:
- Builds headless commerce when flexibility matters
- Creates checkout extensions for Plus stores
- Adds B2B-specific pricing and catalogs
- Automates marketing and dropshipping tasks
- Keeps security and speed in check
- Offers long-term technical support
Services:
- Custom app and integration work
- Headless commerce implementations
- B2B store features
- Marketing automation setup
- Dropshipping process streamlining
- Ongoing maintenance and updates
Contact Information:
- Website: www.brainvire.com
- Email: info@brainvire.com
- Phone: +1-631-897-7276
- Address: 2201 W Royal Lane, Suite 110, Irving, Texas 75063
- LinkedIn: www.linkedin.com/company/brainvire-infotech-inc
- Facebook: www.facebook.com/Brainvire
- Twitter: x.com/Brainvire
- Instagram: www.instagram.com/brainvire_infotech
Conclusion
The “best” agency is the one that gets your specific flavor of chaos. Reach out to two or three that seem to match your vibe, look at live examples (not just pretty case studies), and trust your gut on the call. When it clicks, you’ll know within ten minutes. When it doesn’t, keep looking – there are plenty of solid teams out there who won’t waste your time. Good luck, and may your apps never break during a flash sale
