Never sell the same one-of-a-kind item twice
Twinstock links variants that represent the same physical item — sell one, and the rest go sold out automatically. No more manual updates, no more overselling a piece that's already gone.
Just $14.99/month after your trial. Cancel anytime.
Stop the double-sell
One-of-a-kind items listed across multiple variants can sell more than once without you knowing — until a customer's disappointed and you're issuing a refund.
Sync happens in real time
The moment one variant sells, every linked variant updates automatically — no polling delay, no manual cleanup.
Built for real catalogs, not spreadsheets
Search, filter, and duplicate groups in seconds instead of rebuilding them from scratch every time.
Works across locations
Multi-location inventory is handled correctly out of the box.
Set it and forget it
Auto-link future variants by SKU prefix so new listings join their group automatically.
Know the second something sells out
- —No dashboard-checking required
- —Choose instant alerts or a daily digest, your call
Get notified the moment a group sells out — see exactly which variants were affected.
Up and running in minutes — Twinstock scans your catalog and suggests your groups for you
No manual setup required to get started
Works on any Shopify plan
- Actively maintained, with the features sellers actually ask for
- Built specifically for vintage, handmade, and one-of-a-kind sellers — not a generic inventory tool stretched to fit
- Get notified the moment a group sells out, by email or Slack
One simple plan
$14.99/month
Everything included. No tiers, no per-group fees, no surprises.
Free for 14 days before you're charged anything.
- ✓Unlimited linked groups
- ✓Real-time sold-out sync across all locations
- ✓Email and Slack alerts
- ✓Automatic SKU-based linking
- ✓Onboarding scan to detect your existing groups
Ready to stop double-selling one-of-a-kind items?
Free for 14 days, then $14.99/month. Cancel anytime.