Shopify app comparison
Fast Bundle vs Assortion
Choose Fast Bundle when Growth stores needing several bundle types. Choose Assortion when you want bundles and cart upsells in one app. Choose neither if your current setup already does enough or the expected improvement would not justify the extra cost and work.
Fast Bundle
Growth stores needing several bundle types. Use Fast Bundle when Shopify’s native bundles are too limited but the store still needs a merchant-friendly bundle app.
Setup: Heavier setup
Affiliate link. It never affects our advice.
Assortion
You want bundles and cart upsells in one app. An all-in-one merchandising app for bundles, product add-ons, quantity breaks, cart offers and post-purchase upsells.
Setup: Moderate setup
Affiliate link. It never affects our advice.Neither yet?
Wait if the bundles problem is still occasional, your current setup already handles it or your team does not have time to use either app well.
See the simpler starting point →The differences that matter
Swipe the table to see both apps →
| What to check | Fast Bundle | Assortion |
|---|---|---|
| What you get | Fixed and mix-and-match bundles, Bundle inventory handling, Bundle discount logic | Product bundles and frequently bought together offers, Quantity breaks and product add-ons, Cart customisation and rewards |
| Important limitation | Complex catalogue and fulfilment setups still require careful testing. | A broad feature set creates more setup and testing work. |
Fast Bundle is the stronger fit when:
- Growth stores needing several bundle types
- Teams without developer resource
- It is a strong growth-stage candidate for volume discounts, mix-and-match offers and more flexible merchandising without enterprise implementation.
Assortion is the stronger fit when:
- You want bundles and cart upsells in one app
- You have clear complementary products and margin limits
- You can maintain offer rules as products and stock change
What will you actually pay?
Fast Bundle
From USD 19/monthFree is for development stores only. Live-store plans are $19, $49 and $139/month for up to $1,000, $3,000 and $10,000 monthly bundle sales respectively. Higher usage needs a higher tier.
Pricing checked 2026-09-07Check official pricing ↗Assortion
From USD 9.99/monthFree is for development stores only. Published paid tiers cover up to 50, 200 and 500 total monthly store orders.
Pricing checked 2026-09-07Check official pricing ↗You might not need either yet
Wait if the bundles problem is still occasional, your current setup already handles it or your team does not have time to use either app well.
- Highly customised ERP-dependent bundle inventory
- You only need one fixed bundle that Shopify Bundles can handle
- The problem is still occasional, your current setup already handles it or neither app would create enough value to justify the extra cost and work.
Ready to set it up?
Start with one useful feature and test the customer journey before switching on more.
Set up Fast Bundle
Use Fast Bundle for a controlled first use case and expand only after the result is proven.
- Define the bundle decision case and commercial guardrails
- Select the plan from expected bundle revenue, not store GMV
- Build the minimum controlled set of bundle offers
- Choose the Bundle as a Product architecture before creating SKUs
Set up Assortion
Use Assortion for a controlled first use case and expand only after the result is proven.
- Define the first job
- Configure the smallest useful version
- Check the connected journey
- Run realistic tests
Checks that apply to either app
- The complete customer and operational journey works on mobile and desktop.
- Required Shopify data and integrations update once and in the intended place.
- A person responsible can resolve common failures without unsafe access or manual workarounds.
- The measured value is compared with software cost, team time and new support demand.
Common questions
Is Fast Bundle better than Assortion?
Not automatically. Fast Bundle is the better fit when growth stores needing several bundle types. Assortion is the better fit when you want bundles and cart upsells in one app.
Which is easier to set up: Fast Bundle or Assortion?
Fast Bundle is currently classed as heavier setup, while Assortion is moderate setup. The real effort depends on your data, integrations, theme and the number of workflows you enable.
How should I test Fast Bundle against Assortion before committing?
Choose one real customer journey and one measurable outcome. Complete the same checks for both options, including the complete customer and operational journey works on mobile and desktop. and required shopify data and integrations update once and in the intended place., then compare the result and the work your team had to do.
What should I measure after choosing Fast Bundle or Assortion?
Record the current result before launch, then measure the customer outcome the app is meant to improve alongside app cost, support demand, errors and the time required to run it. Keep the app only when the total value is clear.
Can I switch between Fast Bundle and Assortion later?
Usually, but switching can affect settings, customer data, theme placements, integrations and reporting. Export what you can, document the current setup and test the replacement before removing the original app.
Still comparing?
All bundles options →Sources and independence
Based on official app listings and vendor documentation, not a claim of hands-on testing of every feature. Affiliate relationships do not decide which app we recommend.
Read our methodology