Shopify app development for merchants and app founders
Private apps that do the one job your store needs, and public apps built to pass Shopify’s review the first time. Written on Shopify’s current platform: GraphQL, theme app extensions and Functions.
- Shopify apps are quoted per project with a fixed written price within 24 hours of a free call.
- A real person on WhatsApp within 15 minutes, Mon–Sat 10 am–7 pm IST, in Bengali, Hindi or English.
- You own the work. Code, files, accounts and data stay in your name, with an NDA on request.
Updated by the Nexta Web Solution team
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5+ years experience · 10,000+ clients
Businesses in India, the UK, the Gulf and beyond
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MSME · ISO · PCI DSS · NIXI
Registered, certified and accredited. See details
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Registered Pvt Ltd company
CIN U62099WB2024PTC267968 · 2 offices in Hooghly
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A real person on WhatsApp
Reply within 15 minutes in office hours
Shopify app development at Nexta, in short
Shopify app development at Nexta covers custom apps built for one store and public apps for the Shopify App Store. We build admin apps, theme app extensions, checkout UI extensions and Shopify Functions for discounts, delivery and payment rules, plus integrations with Indian tools such as Razorpay, Shiprocket and Tally. Every project gets a fixed written quote within 24 hours of a free call. Most custom apps ship in three to eight weeks.
Problems that bring merchants to us
“We pay for eighteen apps and the store has become slow”
Every app adds its own script to the theme. Together they push your mobile load time up while the monthly bill keeps growing in dollars.
“Our discount Scripts stopped working”
Shopify switched off all Scripts on 30 June 2026. Tiered discounts, hidden shipping rates and payment rules that ran for years quietly vanished from checkout.
“There are hundreds of apps, but none does exactly what we need”
One app handles B2B pricing, another handles COD checks, a third syncs stock, and they do not talk to each other. You want one small app that fits your process.
“An uninstalled app left code behind in our theme”
Old apps edited theme files directly. They are gone from the admin but their snippets still load, still slow the store down, and sometimes break the cart.
“Our app was rejected by Shopify review”
The feedback mentioned billing, authentication or performance, and your developer is not sure what to change. Each resubmission costs another week.
Shopify app development work we take on
Custom apps for one store
An app installed only on your store or your Plus organisation: order tagging, B2B price lists, warehouse routing, custom reports, ERP or Tally sync. No App Store listing, no approval wait.
Public apps for the App Store
Built for App Store requirements from day one: OAuth and session tokens, Shopify billing, GraphQL Admin API only, privacy webhooks, and performance kept within Shopify’s Lighthouse limit.
Theme app extensions
App blocks and app embeds that merchants place in the theme editor, so nothing is pasted into theme code and nothing is left behind when the app is removed.
Shopify Functions
Discount logic, delivery and payment customisation, cart and checkout validation and bundles, running inside Shopify’s infrastructure rather than as a slow script.
Scripts to Functions migration
We read your old Ruby Scripts, list what each did, and rebuild them as Functions with test cases so the same cart gives the same price as before.
Checkout and post-purchase extensions
Delivery date pickers, GSTIN fields for B2B buyers, gift notes and order status page content through checkout UI extensions, within the limits of your Shopify plan.
Indian commerce integrations
Razorpay or PhonePe payment reconciliation, Shiprocket or Delhivery shipping, COD verification by OTP or WhatsApp, pincode serviceability checks and GST invoice data for your accountant.
From idea to installed app
- 1Week 1
Requirement call and store review
We look at your store, apps and theme with collaborator access and agree what the app must do and what it must not touch.
- 2Week 1
Decide distribution
Custom or public, and which extensions and Functions are needed. Shopify does not let you change distribution type later, so we settle it in writing.
- 3Week 2-6
Build on a development store
Shopify CLI, the official app template and Polaris for the admin UI. You test on a development store that mirrors your products.
- 4Week 6-7
Test and review prep
Lighthouse comparison before and after install, uninstall test, and for public apps a screencast, test credentials and listing copy ready for Shopify’s reviewers.
- 5Week 7-8
Install or submit, then support
Custom apps go live on your store. Public apps go to review and we handle feedback until approval.
What you get
- Working app installed on your store, or submitted to the Shopify App Store
- Source code in a Git repository owned by you
- App created under your own Partner or Dev Dashboard account
- Theme app extensions and Functions with written test cases
- Hosting for the app backend on infrastructure we run, or on your own cloud
- Before and after Lighthouse report for storefront impact
- Admin guide for your team and API notes for future developers
- Listing copy, screenshots and review screencast for public apps
Pricing
Fixed quote within 24 hours
Shopify apps are quoted per project with a fixed written price within 24 hours of a free call. App hosting is billed monthly at cost. Shopify plan fees, the Partner registration fee and any paid APIs are paid by you directly.
Every price shows GST and the total. Nothing is added after you enquire.
Where we differ from the usual app agency
We will tell you if an existing app is enough
If a well-maintained app already does the job for a few dollars a month, building your own is a waste. We say that on the call and suggest the app instead.
The store stays fast
Theme app extensions only, scripts loaded where they are needed, and a Lighthouse check before handover. Shopify itself asks public apps not to drop scores by more than 10 points, and we hold custom apps to the same line.
Indian payments and shipping are familiar ground
COD rules, UPI reconciliation, pincode checks, GST data and Shiprocket labels are day-to-day work for us, not something learned on your project.
You own the app outright
The app lives in your account and the code is in your repository. If you sell a public app, the revenue goes to your Partner account, not ours.
Is this right for you?
A good fit if
- Shopify merchants whose process is not covered by any existing app
- Plus stores that lost Scripts and need equivalent Functions
- Founders planning a public Shopify app for India or global merchants
- Agencies abroad needing a dependable Shopify app developer under NDA
Probably not the right fit if
- A new store setup or theme design, which is covered on our e-commerce website page
- Tasks a free or low-cost App Store app already handles well
- Apps that need to bypass Shopify’s checkout or API rules; we will not build those
Shopify app development: frequently asked questions
Something else? Call +91 7500-4300-91 or WhatsApp us.
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Read moreShopify app development for businesses in Hooghly, Kolkata and worldwide
We are based in Hooghly, with offices in Ramanathpur and near the LIC Office in Chanditala. We work with businesses in Chanditala, Serampore, Chinsurah, Chandannagar, Uttarpara, Arambagh, Howrah, Kolkata and the rest of West Bengal, and we are happy to meet at our office or yours.
Talk to us in Bengali, Hindi or English, on WhatsApp or at our office.
Our Hooghly and Kolkata pageHead office
Ramanathpur, Hooghly
Plot No-229, RamanathpurHooghly, West Bengal 712704
India
Mon–Sat, 10:00 AM – 7:00 PM IST
DirectionsBranch office
Chanditala, Hooghly
Near LIC Office, ChanditalaHooghly, West Bengal 712702
India
Mon–Sat, 10:00 AM – 7:00 PM IST
DirectionsTalk to us about Shopify app development
Tell us what you need in two minutes. Reply within 15 minutes, Mon–Sat 10 am–7 pm IST.