tiergain
Rebuy Personalization Engine vs Tiergain in 2026: who wins on AOV without eating your margins
Rebuy charges based on revenue. Tiergain charges a flat rate. Both lift AOV. Only one lets you keep more of what you earn.
Quick Verdict
Rebuy is a smart cart and AI recommendation engine with revenue-based pricing that scales with your sales. Tiergain is a flat-rate bundle builder with 10 architectures and combined rewards. As your store grows, Rebuy gets expensive. Tiergain stays the same price and lifts AOV 22-30%.
What is Rebuy Personalization Engine?
Rebuy Personalization Engine is a Shopify app that combines a smart cart, AI-powered product recommendations, and cross-sell widgets. It covers in-cart upsells, post-purchase offers, checkout extensions, and dynamic bundles. Rebuy uses machine learning to surface relevant products. It holds a 4.7-star rating with 805 reviews. Pricing includes a free Monetize plan for post-purchase offers, a Build Your Plan option starting at $25/month with a 14-day trial, and a Platform One plan at $538/month with a 30-day trial.
Where Rebuy Personalization Engine Falls Short
Pricing scales steeply with revenue
Rebuy starts at $25/month but scales with your store's Rebuy-generated revenue. The Platform One plan costs $538/month. A growing store can see its Rebuy bill climb fast. Tiergain uses flat-rate pricing: $50/month on Pro whether you generate $10K or $500K in bundle revenue.
Smart cart is not a bundle builder
Rebuy's smart cart shows AI recommendations inside the cart drawer. Customers see suggestions while checking out. But there is no guided bundle flow, no step-by-step kit builder, no interactive experience that walks customers through building a set before they reach the cart.
No combined reward stacking in one offer
Rebuy handles discounts and upsells separately. You cannot stack a percentage discount with free shipping and a free gift in a single bundle offer. Each promotion is isolated, which limits how you structure tiered incentives to push customers past higher thresholds.
Complex dashboard with steep learning curve
Rebuy offers data sources, merchandising rules, A/B tests, and widget configurations. The dashboard is powerful but takes hours to learn. Most merchants use 20% of the features and pay for 100%. Tiergain gets you to your first bundle in 15 minutes.
Cart-focused, not journey-focused
Rebuy activates primarily in the cart and at checkout. By that point, the customer has already decided what to buy. Tiergain embeds bundle builders on product and collection pages, catching customers earlier in their journey when they are still open to adding more items.
Feature-by-Feature Comparison
| Feature | Rebuy Personalization Engine | Tiergain |
|---|---|---|
| Bundle Type Variety | Dynamic bundles, limited types | 10+ architectures, fully customizable |
| Combined Rewards | Separate promotions | Discount + free shipping + free gift |
| Dollar Thresholds | Cart-level only | Yes, quantity or dollar per bundle |
| Smart Cart | Yes, AI-powered | Bundle on product/collection pages |
| Sequential + Free-Flow | No navigation modes | Both modes |
| AI Recommendations | Yes, ML-driven | Manual curation |
| Post-Purchase Upsells | Yes | No |
| Theme Customization | Widget templates | 20+ controls, live preview |
| Mobile-First Design | Responsive | Mobile-first |
| Works With All Themes | Yes | All themes, no code |
| Guided Kit Builder | No | Yes, multi-step |
| Server-Side Discounts | Mixed approach | Shopify Functions |
| Pricing Model | Revenue-based, scales up | Flat-rate |
| Checkout Extensions | Yes | No |
Why Merchants Switch to Tiergain
App costs dropped 78% with flat-rate pricing
A fashion brand generated $35K/month through Rebuy and paid $230/month as their bill scaled with revenue. They moved bundle cross-selling to Tiergain Pro at $50/month. Bundle revenue stayed within 8% of previous levels. The $180/month savings went straight to inventory.
Bundle AOV lifted 26% by catching customers earlier
A wellness store used Rebuy in-cart upsells. Customers had already decided what to buy. With Tiergain bundles on product pages - "build your wellness kit: supplements + vitamins + protein" - customers built bigger carts from the start. AOV went from $67 to $84.
Items per order jumped from 2.1 to 3.6 with guided steps
A kitchen supplies merchant used Rebuy for "add to cart" popups. Items per order averaged 2.1. With Tiergain's guided kit builder - pick a pan, then utensils, then seasonings with escalating discounts - items per order hit 3.6. The step-by-step flow did what cart popups could not.
Frequently Asked Questions
Can I migrate from Rebuy to Tiergain?
Rebuy and Tiergain work differently. Rebuy focuses on in-cart AI recommendations. Tiergain focuses on guided bundle builders. There is no direct migration. Install Tiergain, build your first bundle in 15 minutes, and compare results before removing Rebuy.
Is Tiergain cheaper than Rebuy?
Yes, especially as you scale. Rebuy starts at $25/month but grows with revenue. The Platform One plan costs $538/month. Tiergain is flat-rate: Free / $15 / $50 / $150 per month. Your bill never changes based on sales volume.
How long does it take to set up Tiergain?
First bundle goes live in 15 minutes. Install, pick an architecture, select products for each step, set reward tiers, publish. No data sources or merchandising rules to set up. Rebuy setup takes hours to days depending on how many widgets and rules you build.
Does Tiergain have a smart cart like Rebuy?
No. Tiergain is not a cart app. It embeds bundle builders on product and collection pages, before customers reach the cart. The strategy is different - catch customers earlier in their shopping journey when they are still open to building a bigger order.
Can I run Rebuy and Tiergain together?
Yes. Use Tiergain for guided bundle builders on product and collection pages. Use Rebuy for in-cart upsells and post-purchase offers. They target different stages of the buying journey and do not conflict.
Does Tiergain work with my Shopify theme?
Yes. Tiergain uses Shopify Theme App Extensions. Works with every Shopify theme, including Online Store 2.0 and custom themes. No code edits needed. Uninstalling leaves zero code behind.
Does Rebuy offer real bundle building?
Rebuy offers "dynamic bundles" but they are closer to product groupings with discount rules. There is no multi-step guided builder, no sequential or free-flow navigation, and no combined reward stacking. For structured bundle experiences, Tiergain covers what Rebuy does not.
Ready to switch from Rebuy Personalization Engine?
Free plan available. No credit card required.