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Trunk vs Tiergain in 2026: inventory sync or bundle architecture?
Trunk keeps inventory accurate everywhere. Tiergain moves inventory faster through bundles. Accuracy prevents problems. Velocity generates revenue.
Quick Verdict
Trunk syncs inventory across multiple sales channels and locations. Tiergain builds bundle architecture that sells inventory faster. Trunk prevents overselling. Tiergain accelerates selling. Both are part of a healthy inventory strategy.
What is Trunk?
Trunk is a Shopify inventory sync app that connects inventory across multiple Shopify stores, warehouses, and sales channels. It offers real-time stock updates, multi-location management, and automatic quantity adjustments. Pricing starts at $35/month. It has a 4.5 rating across 200+ reviews.
Where Trunk Falls Short
Inventory Operations, Not Sales Architecture
Trunk keeps inventory counts accurate across channels. It does not influence what customers buy, how they shop, or what the order is worth on any channel.
No Bundle Builder or On-Site Offer Structure
Trunk manages stock quantities and sync rules. It does not create tiered bundles, progressive rewards, or mix-and-match experiences that change cart composition.
Accurate Stock Does Not Equal Fast-Moving Stock
Trunk prevents overselling by keeping counts accurate. But accurate slow-selling inventory is still slow-selling. Bundle architecture moves 3-5 items per order instead of 1.
Multi-Store Sync Without Multi-Product Offers
Trunk syncs inventory between stores. Each store still sells single products at single-product AOV. Bundle architecture grows order value on every store in the network.
Feature-by-Feature Comparison
| Feature | Trunk | Tiergain |
|---|---|---|
| Bundle type variety | No bundle builder | 10+ architectures, fully customizable |
| Combined rewards | No on-site rewards | Discount + free shipping + free gift |
| Multi-store inventory sync | Yes, real-time | No |
| Multi-location management | Yes | No |
| Channel sync rules | Yes, customizable | No |
| Automatic quantity updates | Yes | No |
| Sequential bundle flows | No | Yes, step-by-step |
| Dollar thresholds | No | Yes, quantity or dollar |
| Inventory velocity through bundles | No | Yes, multi-item orders |
| Free plan | No ($35/month) | Yes, free forever plan |
| Works with all themes | N/A (backend tool) | Yes, no code |
| Shopify Functions | No | Yes, server-side discounts |
Why Merchants Switch to Tiergain
22-34% AOV lift moves 3-5 items per order vs single-item sync accuracy
Tiergain bundles sell 3-5 items per order. Trunk keeps counts accurate for single-item orders. Bundle architecture accelerates inventory turns while Trunk keeps the numbers right.
Trunk sync + Tiergain bundles = accurate stock that moves faster
Trunk keeps inventory accurate across all channels. Tiergain moves that inventory faster through bundle offers. Accurate counts + bundle velocity = optimal inventory management.
Tiergain starts free. Trunk starts at $35/month.
Tiergain lifts AOV and inventory velocity at $0/month. Trunk charges $35/month for inventory sync. For stores that need to sell more before syncing more, Tiergain delivers first.
Frequently Asked Questions
Can I use Tiergain alongside Trunk?
Yes. Trunk keeps inventory accurate. Tiergain moves inventory through bundles. Accurate stock + bundle velocity = inventory that is both correct and fast-moving.
Is Tiergain a replacement for Trunk?
No. Trunk handles inventory sync. Tiergain handles bundle architecture. Different parts of inventory management. Both should run together for multi-channel stores.
Is Tiergain cheaper than Trunk?
Tiergain starts free. Trunk starts at $35/month. Tiergain Pro at $50/month is comparable. Both are flat-rate for different functions.
How long does it take to set up Tiergain?
Most merchants go live with their first bundle in under 10 minutes. Tiergain uses Shopify Theme App Extensions - drag and drop, no code editing, works with any theme.
Does Tiergain affect inventory counts?
Tiergain respects Shopify's native inventory. When a bundle sells, Shopify deducts each item's stock. Trunk then syncs those updated counts across channels. Both work with Shopify's inventory system.