The 10 Best Flex Apps for Shopify

The top 10 apps merchants see when they search the Shopify App Store for flex, in the exact order the store ranks them. Only Shopify's organic ranking is shown, never sponsored ads.

Updated September 8, 2026 · Organic ranking

Maintained by Rankbase, built by a Shopify app developer

1

Flex Marketing

· Free

Highlight your acceptance of HSA/FSA payment for products
2

Flex Upsell Cart Auto Discount

★ 5.0 (18 reviews) · Free plan available

Turn Every Cart into Bigger Orders with Smart Upsells
Built for Shopify
3

Flex Bundles

★ 5.0 (12 reviews) · Free trial available

Create custom, native bundle experiences
4

OrderSplit Pro ‑ Split Order

★ 4.7 (23 reviews) · Free trial available

Split orders with rules to customize your fulfillment workflow
Built for Shopify
5

Flex Theme Sections

★ 5.0 (4 reviews) · Free plan available

Add rich sections to your Flex theme for use on any page
6

Trust.io ‑ Trustpilot Reviews

★ 5.0 (11 reviews) · Free trial available

Show Smart Trust Pilot Reviews Trustpilot Widgets on All Pages
7

DreamPrint: Print on Demand

★ 5.0 (2 reviews) · Free

Streetwear, Oversized, Basics - fast POD Service from Germany
8

Posstack Easy Content Builder

★ 4.3 (21 reviews) · Free plan available

No-code section & page builder. Drag and drop in Theme Editor.
Built for Shopify
9

Flex Charges

· Free trial available

Apply flexible, rule-based fees with accurate checkout totals.
10

Flexfulfillment

· Free to install

Dropshipping supplier and fulfillment service

Frequently asked questions

Which is the best Flex app for Shopify?

Based on the Shopify App Store's own organic ranking for "flex", Flex Marketing currently holds the #1 spot. The best choice for your store still depends on your requirements, so compare the top results above.

How is this ranking determined?

We record the organic results merchants actually see when searching the Shopify App Store for "flex", refreshed daily. Shopify's own sponsored ("Ad") results are excluded, so positions reflect its real search ranking rather than paid promotion. Source: the Shopify App Store search results for "flex", you can verify the current ranking there yourself.

Which Flex apps are Built for Shopify?

3 of the top 10 flex apps hold the Built for Shopify badge: Flex Upsell Cart Auto Discount, OrderSplit Pro ‑ Split Order, Posstack Easy Content Builder.

What does the Built for Shopify badge mean?

Built for Shopify
Built for Shopify is the highest level of recognition Shopify awards an app. To earn the badge, an app must meet Shopify's standards for safety, performance, ease of use, and proven usefulness: it cannot slow down the admin, storefront, or checkout, must integrate seamlessly into the Shopify admin, and must demonstrate quality through installs, reviews, and ratings over time. When comparing similar apps, preferring ones with the badge is a safe default. Learn more about the Built for Shopify badge →

As of September 8, 2026, the top-ranked flex app on the Shopify App Store is Flex Marketing. 3 of the top 10 carry the Built for Shopify badge, and the average rating is 4.9 stars across 91 reviews.

Related keyword rankings

All Flex rankings → · Browse all keywords →

Rank higher on the Shopify App Store

Rankbase helps Shopify app developers track keyword positions, analyze install click data, and optimize app listings to rank higher in the Shopify App Store.

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Built by Craftshift

Rankbase is made by Craftshift, a Shopify Partner building apps for product images, variants, and bulk catalog work. We built Rankbase to track the App Store rankings of our own apps first, then opened it to other developers, and this directory grew out of that work. The rankings on these pages are Shopify's own organic search results; we never edit them, including for our own apps.

Craftshift apps on the Shopify App Store