Public App Store apps
From concept to listing: embedded app, billing API, GDPR webhooks, listing copy and screenshots, review submission.
Shopify App Store · Custom apps · Integrations
Shopify apps built to pass review and stay listed.
Master Development builds Shopify apps end to end: idea validation, architecture, embedded admin UI, billing, App Store listing and the review process. We work with Remix / React Router 7, Polaris, the GraphQL Admin API, webhooks and Shopify Functions, and we design around the App Store requirements from the first commit — because a rejected app costs more than a slower one.
What we build
Payment and bank-transfer apps
Payment apps and bank QR / transfer flows for markets Shopify Payments does not cover, designed to satisfy the payment-app policy.
Shipping, invoicing and fiscal integrations
Carrier services, e-invoicing and cash-register integrations for local markets.
Custom merchant apps
Private apps for one store: data sync, ERP connectors, workflow automation, agentic commerce endpoints.
Apps we publish
Ten of our own apps have shipped in the Shopify App Store since 2023 — shipping, marketplaces, fiscal receipts, documents — built for Ukrainian e-commerce. Each one passed Shopify review and is still listed. Here is what they do for stores, and where to start if you need something similar.
Shipping
Nova Poshta Shipping · 4.9★ · 10 reviews
A Nova Poshta waybill from a Shopify order in ten seconds.
The app creates the shipment, prints the label and stores the tracking number in the order — nobody retypes data in the carrier's portal. Customers pick a branch, parcel locker or address in the cart, so fewer parcels go to the wrong place.
- Automatic shipments and fulfillment orders
- Branch / locker picker in the cart
- Tracking numbers stored in Shopify
- from $5/mo + $0.10 per order
- 14-day free trial
UkrPoshta Shipping
UkrPoshta without manual entry.
The same flow for UkrPoshta: shipment, label and tracking number are created from the Shopify order, not in the postal cabinet. A store that ships with both carriers works in one window.
- Create shipments
- Print labels
- Tracking numbers in the order
- from $5/mo + $0.10 per order
- 14-day free trial
Marketplaces
Rozetka Marketplace
Products to Rozetka, orders back into Shopify.
The product feed is generated to Rozetka's requirements; marketplace orders land in Shopify as regular orders with stock, statuses and Nova Poshta shipping. One system of record instead of two cabinets.
- Product feed for Rozetka
- Order import and management
- Sync every 15–30 minutes
- from $9.99/mo
- 14-day free trial
Allo.ua Marketplace
Allo.ua orders in your Shopify, not in your inbox.
The app pulls orders from Allo.ua, creates them in Shopify and hands them to shipping. Marketplace sales go through the same process as your own.
- Order import and management
- Nova Poshta Shipping integration
- Plans by order volume
- from $9.99/mo
- 14-day free trial
Epicentr Marketplace
A daily Epicentr feed with real stock levels.
The feed is built and refreshed every day, inventory included — marketplace shoppers don't order what you no longer have. Product parameters map to Epicentr categories.
- Feed creation
- Product parameters
- Daily generation
- from $9.99/mo
- 14-day free trial
HotLine Marketplace
A clean Hotline feed with no category errors.
The app maps your products to Hotline categories and parameters, generates the feed daily and keeps an error log: you see at once which product lacks a category or a required field. Localised feeds and bulk editing included.
- Hotline categories and parameters
- Daily feed, error log
- Bulk editing, localised feeds
- from $5/mo
- 14-day free trial
Moving to Shopify
Prom.ua Migration Kit
Move from Prom.ua without losing customers and orders.
The app transfers customers and the last two months of orders from Prom.ua into Shopify. Sales history and your mailing base stay with you from day one on the new platform.
- Customer import
- Order import
- Nova Poshta Shipping integration
- from $9.99/mo
- 14-day free trial
Fiscal receipts
Vchasno.Kasa · 5★ · 1 review
Fiscal receipts for online payments — no cashier, no cash register.
Every payment through the gateway gets a fiscal receipt via the Vchasno.Kasa software register approved by Ukraine's tax service; the receipt goes to the customer by e-mail and to the tax service automatically. Runs 24/7, handles sales and returns.
- Sale and return receipts
- E-mail to the customer
- Register shift control
- free plan · Pro from $5/mo + $0.10 per receipt
Orders and documents
WAWI BOS
Invoices, delivery and orders under control in one app.
Kanban, calendar and list views of orders; your own checkout fields (date and time, instructions, pickup point); branded PDF invoices with your logo sent automatically when an order is created or fulfilled. Product descriptions can be generated and translated with your own ChatGPT prompts.
- Sales and purchase PDF invoices
- Custom checkout fields
- Order kanban
- from $9.99/mo, yearly −8%
- 14-day free trial
Pricing
MasterKit: Recalculator
Prices follow the exchange rate every day — on their own.
Set the purchase currency and rounding rules; the app recalculates retail prices daily from a rate feed or a rate you enter. Margin doesn't drift when the rate jumps, and nobody edits prices by hand.
- Daily recalculation
- Rate from a feed or entered manually
- Multi-currency, rounding
- from $9.99/mo
- 14-day free trial
Need an app for your market?
These ten grew out of real tasks of Ukrainian stores. Describe yours — a carrier, a marketplace, a tax service, an ERP — and we will tell you whether it will pass review and how long it takes.
Book a scoping callHow we work
Stack
Remix / React Router 7, Polaris, Prisma with MySQL or Postgres, AWS (SQS, Lambda) for background work. Ruby on Rails for selected projects.
Review readiness
Requirement checklist mapped to each feature before build; session-token auth, mandatory webhooks, billing and performance budgets covered.
Data
Merchant data stays in the app's database, scoped per shop; no cross-merchant analytics.
After launch
Version upgrades, API deprecations, support tiers and App Store optimisation.
Delivery
Validation
Market and competitor check, listing angle, pricing model.
Spec
Screens, data model, webhooks, billing plan, review checklist.
Build
Weekly builds on a development store; you test each increment.
Listing and review
We handle submission and reviewer feedback until the app is live.
Questions we get on the first call
Can you build a payments app for a market Shopify Payments does not support?
Yes. We build payment apps and bank-transfer / QR flows and structure them to meet Shopify's payment-app policies.
Do you handle the App Store review process?
Yes. Submission, responses to reviewer feedback and re-submission are part of the fixed scope.
Who owns the code?
You do. The repository and the Partner account are yours; we work inside them.
Do you also do Shopify theme work?
Only when it is part of an app project. Our focus is apps and integrations.
Describe the app in three sentences.
We will reply with whether it can pass review and a rough size.
Book a scoping call