Predictable checkout.
Upsells without order fees.
Rebuy’s price grows with your orders. CheckoutOS includes checkout and post-purchase offers, bundles, reorder reminders, checkout chat and rewards at checkout for $99 a month.$99/month. No per-order fees.
Self-serve software or help with setup and migration.
Side by side
See exactly what you get with each one.
Who each one is best for. Choose Rebuy if you are a mid-size or large brand that wants one AI personalization layer across the cart, product pages, search, checkout and post-purchase, with deep A/B testing. Choose CheckoutOS if you want checkout offers, post-purchase upsells, bundles, checkout blocks and cart rules from one app for $99 a month, with no per-order fees.
Checked October 16, 2026. Rebuy facts come from Rebuy pricing, the Rebuy App Store listing and Rebuy integrations. “Not listed” means those pages didn’t name the feature when we checked, not that Rebuy can’t do it.
| Feature | Rebuy | Chargezen |
|---|---|---|
| In-cart upsells Product suggestions in the cart | Smart Cart | Included |
| Post-purchase upsells One-click offers after checkout | Included | Included |
| AI recommendations Smart product suggestions | Included | Included |
| A/B testing Test different offers and placements | Included | Included |
| Bundles Bundles customers can build or buy | Included | Included |
| Checkout extensions Offers inside Shopify checkout | Shopify Plus | Included |
| Offer a subscription Turn one-time buyers into subscribers | Subscription upgrade | Included |
| Rewards at checkout Show points as customers buy | Through loyalty integrations | Included |
| Reorder reminders Remind customers when it’s time to buy again | Not listed | Included |
| Checkout chat Answer questions during checkout | Not listed | Included |
| Pricing by order volume Monthly price rises with orders | Yes, by orders per month | No, $99/month |
Rebuy
- In-cart upsells
- Smart Cart
- Post-purchase upsells
- Included
- AI recommendations
- Included
- A/B testing
- Included
- Bundles
- Included
- Checkout extensions
- Shopify Plus
- Offer a subscription
- Subscription upgrade
- Rewards at checkout
- Through loyalty integrations
- Reorder reminders
- Not listed
- Checkout chat
- Not listed
- Pricing by order volume
- Yes, by orders per month
Chargezen
- In-cart upsells
- Included
- Post-purchase upsells
- Included
- AI recommendations
- Included
- A/B testing
- Included
- Bundles
- Included
- Checkout extensions
- Included
- Offer a subscription
- Included
- Rewards at checkout
- Included
- Reorder reminders
- Included
- Checkout chat
- Included
- Pricing by order volume
- No, $99/month
What you’d really pay
Rebuy prices each package by your orders per month. CheckoutOS is one monthly price.
Rebuy
- Build your own plan
- From $25/mo for one package
- Platform One (all packages)
- $534/mo billed monthly
- Premium Support
- $499/mo add-on
- Price at higher order volumes
- Scales with orders per month
Estimated Annual Cost
Depends on orders
Package prices scale with orders per month; annual billing saves 10%. Rebuy also offers Rebuy Monetize, a free option that pays you per order for showing offers. Rebuy pricing, checked October 16, 2026.
Chargezen
- CheckoutOS
- $99/mo
- Per-order fee
- $0
- Share of upsell revenue
- $0
- Order limits
- None
Annual Cost
$1,188/year
CheckoutOS is $99/month, billed monthly, with no per-order fees. Pre-orders are included. Taxes are extra. Chargezen pricing.
Plan your move from Rebuy
Check your data, billing dates and launch plan before you switch.
Talk through your move- 01
List your offers
Write down the Rebuy widgets, rules and bundles that perform best today.
- 02
Rebuild them in CheckoutOS
Create the same cart, checkout and post-purchase offers.
- 03
Test side by side
Use A/B tests to compare results before you switch everything over.
- 04
Turn off Rebuy
Remove the old widgets so customers only see one set of offers.
“We were paying Rebuy $600/month and it kept going up as we grew. CheckoutOS gave us the same upsell motion, plus reorder reminders for repeat orders, with cleaner pricing.”
Why brands switch to Chargezen
Unified Platform
Run AI agents, texts and email, upsells, creators and subscriptions from one place.
AI-Powered
AI agents answer customers, follow up and handle everyday busywork for your team.
Clear Pricing
See prices and usage costs, billed monthly or yearly.
Ready to switch from Rebuy?
See the products, prices and setup help that fit your brand.
Common questions
Rebuy’s build-your-own plan starts at $25/month for one package, and Platform One with every package is $534/month billed monthly; prices scale with orders per month (checked October 16, 2026). CheckoutOS is $99/month with no per-order fees.
