Duplicup vs. NASP Connected Inventory Comparison
| Capability | Duplicup ‑ Duplicate SKU Sync | NASP Connected Inventory |
|---|---|---|
| App Store Rating | 5.0 / 5.0 Stars (Verified) | 3.3 / 5.0 Stars (Many Complaints) |
| Real-Time Sync Speed | Sub-second via Webhooks + GraphQL | Reported delays & sync lag |
| Manual Variant Linking | Yes — Custom Link Groups | Limited / Identical SKUs only |
| Multi-Location & POS | Native per-location isolated sync | Complex setup |
| Free Plan Available | Yes (Up to 3 SKUs free) | Paid-only tiers |
| Customer Support | Direct Engineer Priority Support | Slow response times reported |
3 Reasons Shopify Merchants Make the Switch
- No More Sync Delays: Duplicup synchronizes stock in milliseconds using Shopify webhooks and distributed locking, eliminating the race conditions that cause overselling during flash sales.
- Manual Variant Linking: Link any variants together into a shared inventory pool even if their SKU codes differ.
- Direct Developer Support: Work directly with the engineers building the app for rapid setup and custom feature requests.
Verified Merchant Review
“I've tried several other apps for managing shared inventory across variants and locations, and none of them quite delivered. This one finally does. Everything stays perfectly in sync.”
— Stash Shop (United Kingdom, 5/5 Stars)
Frequently Asked Questions
- Why are merchants switching from NASP Connected Inventory to Duplicup?
- Merchants switch due to reliability and support concerns. Duplicup provides sub-second webhook synchronization with distributed locking and direct engineer support.
- How long does migration take?
- Less than 5 minutes. No theme modifications or liquid code to remove.
- Can I link variants with different SKUs?
- Yes, via Duplicup Custom Link Groups.