The five apps
NUO AI — the only uncapped free FBT tier here, and the newest app here
Our app 5.0 · thin review history · NUO AI, Manhattan NY
Start with the caveat. Every other app on this page has between 1,212 and 3,642 App Store reviews. NUO AI has far fewer. If track record is your selection criterion, this is the wrong app on this page and one of the others is the right one.
What it offers in exchange is AI-matched companion recommendations with no stated cap on campaigns, bundles, or revenue — bundled with gift-with-purchase, BOGO, tiered rewards and add-ons at $0, with no paid tier to graduate into.
- Free planEvery feature, no stated bundle, campaign or revenue cap
- Paid tierNone
- Best forStores wanting FBT bundled with other offer types, not a standalone bundle builder
- Weakest atTrack record — a short App Store history against competitors with thousands of reviews
Full breakdown of frequently bought together in NUO AI · Shopify App Store listing
Selleasy — a free tier that just changed shape, now campaign-capped not order-capped
4.9 · 2,778 reviews · Logbase
Selleasy runs 18 upsell and cross-sell strategies including frequently bought together, with pre-purchase, in-cart and post-purchase placements. Its free plan now explicitly allows unlimited orders.
The cap moved from orders to campaigns. The current listing states “Up to 5 campaigns” rather than the order-count threshold earlier roundups describe — a materially different constraint. A store running one FBT campaign plus a couple of others stays well inside the free tier regardless of order volume.
- Free plan“Up to 5 campaigns,” unlimited orders · 18 upsell/cross-sell strategies
- Next tier~$8.99/mo Starter · ~$28.99/mo Pro · ~$58.99/mo Max, 30-day free trial
- Beats NUO AI at2,778 reviews, 18 named strategies, and unlimited orders on the free plan
Shopify App Store listing
Essential Upsell — the only cap that waits until the app has paid for itself
5.0 · 2,481 reviews · Essential Bundles & Upsells
Essential ties its free tier to outcome rather than effort: “Up to $100 additional revenue generated,” covering FBT bundles alongside its other upsell placements. A store that installs it and sees no lift is never charged.
It expires fastest for the merchants it works best for. $100 of attributed revenue arrives quickly on a mid-sized catalog, so treat this as a proof-of-concept window rather than an ongoing free plan.
- Free plan“Up to $100 additional revenue generated” — FBT, product page and post-purchase offers
- Next tier~$9.99/mo Starter · ~$19.99/mo Essential · ~$39.99/mo Growth, 14-day trial
- Beats NUO AI atA 5.0 average sustained across 2,481 reviews, and a cap structure that's honest by design
Shopify App Store listing
Frequently Bought Together CBB — the category's original app, capped by manual bundle count
4.9 · 1,212 reviews · Code Black Belt
One of the oldest dedicated FBT apps, with AI, manual or global recommendation modes trained on over a billion orders. It is installed on over 25,000 stores and offers all three recommendation modes even on the free plan.
The free cap is a bundle count, not revenue or orders. “Max 3 manual bundles” is narrow for a store wanting FBT across many product types at once, though the AI and global modes aren't separately capped by the same number on the listing.
- Free plan“Max 3 manual bundles” · AI, manual and global recommendation modes
- Next tier~$9.99/mo Professional I (50 orders/mo) · ~$24.99/mo Professional II (500) · ~$39.99/mo Professional III (500+)
- Beats NUO AI at1,212 reviews, AI trained on 1+ billion orders, and the longest track record in this category
Shopify App Store listing
Fast Bundle — the most-reviewed app here, but the free plan doesn't apply to your store
5.0 · 3,642 reviews · Fast Bundle
Fast Bundle combines mix-and-match, fixed bundles, custom kits, quantity breaks and “unlimited AI frequently bought together” in one bundle builder — the highest review count in this comparison.
The catch is who the free tier is for, and the AI feature is paid-only. The listing states its free plan is “for development stores,” and unlimited AI-powered FBT is included only on paid tiers from roughly $19/month, capped by monthly bundle-sales revenue rather than orders.
- Free planDevelopment stores only — not usable on a live storefront; AI FBT is paid-tier only
- Next tier~$19/mo Standard ($1,000 bundle sales) · ~$49/mo (3,000) · ~$139/mo (10,000)
- Beats NUO AI at3,642 reviews, dedicated mix-and-match and kit builders, and quantity breaks
Shopify App Store listing
