The 10 Best Function Apps for Shopify

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

Updated October 10, 2026 · Organic ranking

Maintained by Rankbase, built by a Shopify app developer

The word looks generic and the results are one specific thing: no-code builders for Shopify Functions, the mechanism that replaced Shopify Scripts. Scripts is not being retired, it is gone, past both the date when new ones stopped being publishable and the date when existing ones stopped running. Anyone who had custom checkout logic on the old system has had to rebuild it, and this category is where merchants without a developer go to do that.

The plan story flipped in the process, which is the part worth understanding. The old script editor was for the top plan only. Functions are not: any plan can use a public app that contains functions, and it is custom apps containing function APIs that stay restricted to the top plan. That is why so many of these listings advertise working without Plus, and the claim is broadly true for discounts, payment customization, delivery customization and validation. It stops at cart transform, where rewriting a line's price or title is limited to development stores and the top plan, and where an app is allowed only one such function per store anyway.

One more thing that shapes what you can buy: the App Store does not permit apps that offer dynamic editing and execution of function code. So none of these is a code editor. Each ships a prebuilt function that reads your choices from configuration, which means the question is never "can it do anything" but "does its configuration cover my rule".

1

SMART Functions Creator

★ 5.0 (128 reviews) · Free to install

Migrate and create scripts or discounts with a function editor
Built for Shopify
2

SupaEasy: AI Functions creator

★ 5.0 (234 reviews) · Free plan available

Create any discount. Control payments, shipping & orders.
Built for Shopify
3

Function Studio

★ 4.9 (20 reviews) · Free plan available

Visual creator for custom discounts and other functions
Built for Shopify
4

Functions Creator & Discount

★ 5.0 (30 reviews) · Free plan available

Create unlimited discount functions, shipping, payment & rules
Built for Shopify
5

PowerX ‑ Functions Creator

★ 4.8 (35 reviews) · Free plan available

Script to Functions: Discount, BOGO, Free Gift, Volume & More
Built for Shopify
6

Flowly: Discount Functions

★ 5.0 (5 reviews) · Free

No-code discount rule builder for Functions set up in minutes.
Built for Shopify
7

NERD Discount/Bundle Functions

★ 5.0 (8 reviews) · Free trial available

Create custom discount & bundle Functions on any plan.
8

Function Junction Promos

★ 5.0 (10 reviews) · Free to install

Build advanced Functions for discounts, bundles, promos & more
9

TikTok Shop Integration — SPL

★ 4.9 (845 reviews) · Free to install

Sell on TikTok Shop to increase sales opportunities
Built for Shopify
10

EG Auto Add to Cart Free Gift

★ 4.9 (1,137 reviews) · Free plan available

Lift AOV with auto-add free gift with purchase and BOGO offers
Built for Shopify

Compare the top 3 head-to-head

All app comparisons →

What to look for in a Function app

Which function type you actually need: Discounts, payment method customization, delivery customization, and cart or checkout validation are separate APIs doing separate jobs. Most listings cover several, and the depth is uneven. Write the rule you want in one sentence first, then check that exact sentence against the configuration options.
How the rule is expressed: Since you are configuring rather than coding, everything depends on what the form lets you say. Conditions on tags, collections, quantity, cart total, customer segment, address or payment method, and whether those combine with both and and or, is the real feature list hiding under the marketing one.
What happens when rules meet each other: Two discount functions, a validation rule and an automatic discount can all apply to the same cart. Ask about ordering and about combination with Shopify's own discounts, because this is where the surprises live and where a checkout starts refusing orders you wanted.
Whether you are migrating something: If you are replacing a script that used to run, bring its logic with you and test the awkward cases first: the mixed cart, the customer with two applicable tags, the order that should be blocked. Vendor copy in this category still talks about the old system in the future tense, which tells you how carefully the listing is maintained.

Frequently asked questions

Which is the best Function app for Shopify?

Based on the Shopify App Store's own organic ranking for "function", SMART Functions Creator currently holds the #1 spot, with a 5.0 star rating across 128 reviews. 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 "function", 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 "function", you can verify the current ranking there yourself.

Which Function apps are Built for Shopify?

8 of the top 10 function apps hold the Built for Shopify badge: SMART Functions Creator, SupaEasy: AI Functions creator, Function Studio, Functions Creator & Discount, PowerX ‑ Functions Creator and more.

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 October 10, 2026, the top-ranked function app on the Shopify App Store is SMART Functions Creator, with a 5.0 star rating across 128 reviews. 8 of the top 10 carry the Built for Shopify badge, and the average rating is 5.0 stars across 2,452 reviews.

Related keyword rankings

All Function rankings → · Browse all keywords →

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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.

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