# Ecommerce & Sales App Development

> gaa-tha builds ecommerce and sales apps for brands and distributors: D2C shopping apps connected to Shopify through the Storefront API or to a custom catalogue, B2B ordering apps for retailers and distributors, and field-sales apps with beat plans, order booking, schemes, offline mode and Tally or ERP sync — plus loyalty, push and WhatsApp journeys that bring buyers back.

- Page: https://gaa-tha.com/services/ecommerce-app-development
- Practice: [Websites & Apps](https://gaa-tha.com/services/technology)
- Provider: gaa-tha (https://gaa-tha.com)
- Last updated: 2026-10-22

## At a glance

- **Best for:** D2C brands with strong repeat purchase, FMCG and consumer brands selling through distributors, wholesalers and B2B suppliers, and teams booking orders in the field
- **Timeline:** Shopify-connected shopping apps 6–10 weeks; B2B ordering and field-sales apps 8–16 weeks
- **Engagement model:** Project fee by phase, then an optional monthly maintenance and growth retainer
- **Channels / platforms:** iOS and Android (Flutter or React Native), Shopify Storefront API, Tally Prime, ERP and DMS integrations, WhatsApp Business API

## What is Ecommerce & Sales App Development?

Ecommerce and sales app development covers mobile apps that take orders: shopping apps that let consumers browse and buy from a brand directly, B2B ordering apps that let retailers and distributors reorder from their own price lists, and sales-force automation (SFA) apps that field reps use to visit outlets, book orders and log collections. All three share a core — catalogue, prices, cart and order — but each serves a different user with different business rules.

At gaa-tha these apps are built around the system that already runs the business. A D2C app reads products, stock and customers from Shopify so the store and the app never disagree; a B2B or field-sales app syncs with Tally or your ERP so prices, schemes and outstanding balances are right before a rep walks into a shop. Because we also run D2C marketing, push, WhatsApp and loyalty journeys are planned with the app, not bolted on later.

## What's included

- D2C shopping app on Shopify via the Storefront API — collections, search, filters, wishlist, cart and customer accounts in sync with your store
- Custom catalogue backend where there is no Shopify store, with product, price and inventory management
- Checkout with UPI, cards, wallets and COD through Razorpay or your existing checkout provider, with coupons and offers
- B2B ordering app: customer-specific price lists, minimum order quantities, credit limits, quick reorder, order history and invoice downloads
- Field-sales app: beat plans, GPS check-in, outlet onboarding, order booking, schemes and discounts, collections and shelf photos
- Offline mode for weak-network areas, with conflict-safe sync when the phone reconnects
- Tally Prime, ERP and distributor management system (DMS) sync for items, rates, stock, orders and outstanding balances
- Loyalty points, referrals and tiered rewards, with push notifications segmented by buying behaviour
- WhatsApp Business API messages for order confirmations, dispatch updates and reorder reminders
- Manager dashboards for sales by rep, beat, outlet and SKU, plus App Store and Play Store publishing

## How we work

1. **Map the order flow** — We follow an order from the buyer or rep through to dispatch and invoice, list the rules for prices, schemes, credit and GST, and decide which system is the source of truth.
2. **Design for the real user** — Screens are designed for the person holding the phone: a shopper on a mid-range Android, a retailer reordering between customers, or a rep with one hand free and patchy signal.
3. **Build and integrate** — The app, backend and admin are built in sprints, and the Shopify, Tally or ERP, payment and WhatsApp integrations are tested with real data, not samples.
4. **Pilot** — A shopping app goes first to a small group of loyal customers and a sales app to one territory or a few reps; we fix what they find before the wider rollout.
5. **Launch and grow** — Store publishing, team training and rollout follow, then push, loyalty and reorder journeys are tuned month by month from usage data.

## Deliverables

- Order-flow map with business rules and an integration plan
- Designed and tested screens for each type of user
- iOS and Android apps published under your developer accounts
- Admin panel and manager dashboard
- Working integrations with Shopify, Tally or ERP, payments and WhatsApp
- Source code, API documentation and rollout training material

## Tools & platforms

Flutter, React Native, Shopify Storefront API, Firebase, Node.js, Razorpay, Tally Prime, WhatsApp Business API, Google Maps Platform

## Pricing model

Quoted by phase based on the type of app, user roles, integrations and offline needs; platform, messaging and developer-account fees are paid by you directly, and a monthly retainer covers maintenance and growth.

## Frequently asked questions

### Does my D2C brand need an app, or is the Shopify website enough?

Most D2C brands should wait on an app until repeat customers are a meaningful share of revenue, because an app mainly serves people who already buy from you. It earns its cost when products are reordered often — food, beauty, pet care, household essentials — and when push notifications and loyalty can replace part of your remarketing spend. Until then, a fast mobile website and WhatsApp journeys usually return more.

### How does a Shopify-connected app stay in sync with my store?

A Shopify-connected app reads products, collections, prices, inventory and customer accounts from Shopify's Storefront API, so anything you change in the Shopify admin appears in the app without double entry. Orders placed in the app land in Shopify like any other order, so fulfilment, Shiprocket and your reports keep working as they do today.

### Should we use an app builder or build a custom app?

A subscription app builder is a sensible start when you want a standard shopping app quickly and your store has no unusual logic. A custom app makes sense when you need your own features — kit builders, subscriptions, B2B pricing, loyalty linked to offline stores — or want to stop paying a fee that grows with your revenue. We compare both against your roadmap before recommending either.

### What is a field-sales app, and what does it do?

A field-sales or sales-force automation app is what sales reps use on their phones to follow their beat, check in at outlets, show the catalogue, book orders with the right scheme, record payments and capture shelf photos. Managers see orders, visits and productivity by rep and territory as they happen, instead of collecting orders on paper or WhatsApp at the end of the day.

### Will the sales app work without internet?

Yes. The catalogue, prices, schemes and each rep's outlet list are stored on the phone, orders are saved offline, and everything syncs when the network returns, with checks so the same order is not booked twice. This matters in tier-2 and tier-3 towns, rural beats and inside large stores where signal drops.

### Can the app sync orders with Tally or our ERP?

Yes. We connect apps to Tally Prime, Zoho, Odoo, ERPNext, SAP Business One or a custom ERP so items, rates, stock, customer balances and orders flow both ways. The method — an API, a connector or a scheduled sync — depends on your system and version, which we check during discovery.

### How long does an ecommerce or sales app take, and what drives the cost?

A Shopify-connected shopping app usually takes six to ten weeks, and a B2B ordering or field-sales app eight to sixteen. Cost is driven by the number of user roles, the depth of Tally or ERP integration, offline sync, pricing and scheme rules, and how much loyalty and reporting the first release needs. We scope a pilot version first so you see the app working before committing to the full build.

### Who owns the app, the code and the customer data?

You own all of it. The apps are published under your developer accounts, the backend runs in cloud accounts in your name, and the source code is handed over in your repository. Customer and sales data stays in your systems rather than a shared platform.

## Related services

- [Mobile App Development](https://gaa-tha.com/services/mobile-app-development): iOS and Android apps designed, built, published and maintained by one team — from the first screen to the store listing.
- [Web & Mobile App Design](https://gaa-tha.com/services/app-design-development): UI/UX for apps, admin consoles and dashboards — clickable prototypes, then developer-ready systems.
- [SaaS Product Development](https://gaa-tha.com/services/saas-product-development): From a validated idea to a SaaS product that signs up, bills, scales and passes a customer's security review.
- [Shopify Store Design & Development](https://gaa-tha.com/services/shopify-development): Shopify stores designed for conversion and built for speed — custom themes, custom sections and the checkout integrations Indian D2C brands need.

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**About gaa-tha** — gaa-tha is a storytelling-led digital marketing, branding, ecommerce, technology and AI agency founded in Gujarat, India in 2024. It builds brands, websites, Shopify stores, mobile apps, SaaS products, AI agents, automations and ERPs; runs Meta and Google ads, social media and SEO/AEO/GEO; and onboards and manages brands on Amazon, Flipkart, Myntra, Blinkit, Zepto and Swiggy Instamart.

Contact: digimarketing@gaa-tha.com · +91 97372 80309 · https://gaa-tha.com/#contact · All services: https://gaa-tha.com/services · Site summary for AI assistants: https://gaa-tha.com/llms.txt