Illustrative previewA build-to-order Shopify POS extension that lets you keep selling during internet outages
— full offline cart, receipt printing, queued orders and conflict-safe resync when connectivity returns.
What is Advanced Offline POS?
A build-to-order Shopify POS extension that lets you keep selling during internet outages — full offline cart, receipt printing, queued orders and conflict-safe resync when connectivity returns. Built to order by ECOSIRE for Shopify (build-to-order) — indicative price from $999.00 USD; request a quote for a scoped proposal.
Key Features
Built to order, done for you
No DIY setup — a working app, built, installed and supported by ECOSIRE.
- 1
You order
Start with a one-time build price. We scope it with you at kickoff.
- 2
We build & install
ECOSIRE builds, configures and installs it on your Shopify.
- 3
Go live + support
You go live in about one working week, with two weeks of go-live support. Defects in the code we deliver are fixed free of charge.
About this Product
Advanced Offline POS is a custom Shopify POS extension that keeps your registers selling when the internet does not. When connectivity drops, the app switches to a local-first cart backed by an on-device inventory cache, so staff can scan, ring up, take payment and print receipts without a live connection — then everything auto-resyncs to Shopify the moment you are back online.
This is not an instant App Store download. ECOSIRE builds, installs and supports it for your specific store, theme of operation and hardware. We provision it as a Shopify POS UI Extension (Point of Sale extension) plus a private app authenticated via OAuth with scoped access to the Admin GraphQL API. Product, variant, price and multi-location inventory data are cached locally for fast offline lookup; completed offline sales are held in a durable queue and replayed as orders through the Admin API when the device reconnects.
Because retail outages create real inventory drift, the app reconciles carefully: stock movements are applied against Shopify's multi-location inventory levels with a conflict-safe strategy, and edge cases (oversold variants, duplicated queue entries) are flagged rather than silently overwritten. Order, payment-method and tender metadata are preserved using order metafields so your back office sees a clean, auditable record.
Typical fit: shops in low-connectivity locations, pop-ups, weekend markets and event stalls where a dropped connection currently means a stopped till. We scope your exact tender types, receipt format, printer model and inventory rules during onboarding, then deliver a tested, installed extension. A one-time build fee of $999 covers design, build and installation; ongoing support and Shopify-API compatibility updates are available as an arrangement we agree with you.
What you get
- A Shopify POS UI Extension plus private app installed and configured on your store via OAuth
- Local inventory, customer and gift-card cache wired to your live catalog through the Admin GraphQL API
- Offline order queue with idempotent auto-resync and duplicate-protection logic
- Conflict-safe multi-location inventory reconciliation tuned to your stock rules
- Receipt printing configured for your specific POS printer hardware
- A short onboarding session plus written operating notes for staff (offline mode, resync, conflict handling)
Who this is for
Low-connectivity retailer
A shop owner in an area with unreliable internet who loses sales every time the connection drops. They need the till to keep working through outages and reconcile cleanly once the line is back.
Pop-up and market vendor
A seller running weekend markets, fairs or event stalls on patchy mobile data. They need fast offline scanning, payment and receipts on a tablet, with sales syncing back to the home store automatically.
Multi-location retail operator
An operator running several stores or stalls who cannot risk inventory drift across locations. They need offline sales that reconcile safely against Shopify's per-location inventory rather than overwriting it.
How Advanced Offline POS Compares
| Criterion | ECOSIRE | Custom Build | Competitor | Shopify Native |
|---|---|---|---|---|
| True offline cart, checkout and receipt printing | Included | Partial support | Not included | Not included |
| Queued orders auto-resync to Shopify via Admin GraphQL API | Included | Partial support | Not included | Not included |
| Conflict-safe multi-location inventory reconciliation | Included | Partial support | Not included | Partial support |
| Offline customer and gift-card lookup | Included | Partial support | Not included | Not included |
| Built, installed and supported for your specific store | Included | Included | Not included | Not included |
| Instant self-service install from the App Store | Not included | Not included | Included | Included |
| No internal engineering effort required from you | Included | Not included | Included | Included |
| Tailored to your tender types, printer and inventory rules | Included | Included | Not included | Not included |
Frequently Asked Questions about Advanced Offline POS
Is this an instant download from the Shopify App Store?
No. Advanced Offline POS is build-to-order. ECOSIRE builds, installs and configures it for your specific store, tender types, printer and inventory rules. There is no instant App Store install — we deliver and set it up for you.
How long does delivery take after I purchase?
After purchase we schedule a short scoping call to confirm your tender types, receipt format, printer model and inventory rules. A typical build and installation completes within roughly one working week depending on hardware and edge cases; we confirm exact timing with you before work starts.
What happens to a sale made while the till is offline?
The sale is completed locally — cart, payment capture flow and receipt printing all work offline. It is stored in a durable on-device queue and replayed to Shopify as an order through the Admin GraphQL API when connectivity returns. Replay is idempotent, so a reconnect or app restart never creates duplicate orders.
How is inventory kept accurate if two registers sell offline at once?
On resync, stock movements are applied against Shopify's multi-location inventory levels using a conflict-safe strategy. If an offline sale would oversell a variant or collides with another queued sale, the app flags it for review rather than silently overwriting — so you reconcile knowingly instead of discovering drift later.
Do I get ongoing support and updates as Shopify changes its APIs?
Yes, as an arrangement we agree with you. The $999 fee covers the one-time build and installation. Because the app depends on the Shopify Admin GraphQL API and POS extension platform, we offer ongoing support and compatibility updates as a separate maintenance arrangement so the integration keeps working as Shopify evolves.
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Advanced Offline POS
A build-to-order Shopify POS extension that lets you keep selling during internet outages — full offline cart, receipt printing, queued orders and conflict-safe resync when connectivity returns.
- Offline cart, checkout and tax/discount handling that works with no connection from a local-first POS UI Extension
- Receipt printing while offline via your existing Shopify POS-supported printer hardware
- Local inventory cache of products, variants, prices and barcodes for instant offline product lookup
- Queued offline orders that auto-replay to Shopify through the Admin GraphQL API when connectivity returns