The Best Square Integrations and Apps in 2026
Square runs payments, point of sale, online stores, appointments, and payroll for millions of small businesses — but the register only earns its keep when the sales it captures flow into the tools that keep your books, market to your customers, and ship your orders. In 2026 Square expanded its App Marketplace to nearly 1,000 partner integrations, spanning accounting, e-commerce, fulfillment, and marketing.
The gap: if the tool you need isn’t in the marketplace, you’re back to CSV exports and manual re-keying. Here are the Square integrations actually worth setting up, grouped by what they do — and then the way to connect Square to anything with an API.
Accounting: QuickBooks, Xero, Restaurant365
Push each day’s sales, fees, and payouts into the ledger instead of reconciling them by hand.
- QuickBooks Online — Square’s Intuit connection syncs sales, refunds, taxes, and processing fees into your books automatically.
- Xero — pull Square transactions and daily settlements into Xero so your reconciliation matches the deposit.
- Restaurant365 — sync sales and labor data for restaurant operators running back-office accounting on R365.
E-commerce and website builders: WooCommerce, Wix, Ecwid
Keep one catalog and one inventory count across your storefront and your register.
- WooCommerce — the Square for WooCommerce plugin syncs products and inventory and takes Square payments on your WordPress store.
- Wix — build a Wix site that uses Square as the payment processor and shares its catalog.
- Ecwid and BigCommerce — additional storefronts that sync inventory and orders with Square POS.
Fulfillment and marketplaces: ShipStation, Shippo, Etsy, Printful
Turn an online order into a picked, packed, and shipped parcel without leaving your workflow.
- ShipStation — import Square Online orders, buy discounted labels, and push tracking back automatically.
- Shippo — multi-carrier shipping and label printing tied to your Square orders.
- Etsy — sync inventory between an Etsy shop and Square so a sale in one decrements the other.
- Printful and Faire — print-on-demand fulfillment and wholesale sourcing wired into your Square catalog.
Inventory and back office: Thrive, SKU IQ, Gusto
- Thrive by Shopventory — advanced inventory counts, purchase orders, and reporting layered on top of Square.
- SKU IQ — real-time inventory sync between Square and other sales channels.
- Gusto — run payroll and benefits alongside Square, or use Square’s own native Payroll if you’d rather stay in-house.
Email marketing and loyalty: Square Marketing, Square Loyalty, Mailchimp
- Square Marketing — Square’s built-in email and text campaigns fire off the customer directory your register already collects.
- Square Loyalty — points and rewards tracked at checkout, native to the POS.
- Mailchimp and ActiveCampaign — connect Square’s customer list to a dedicated email platform (typically via Zapier) for richer campaigns and automations.
Scheduling: Square Appointments add-ons
- Square Appointments — native booking that shares the same POS, Payments, Marketing, Loyalty, and Payroll stack, so a booked visit becomes a paid, tracked transaction end to end.
No-code automation: Zapier and Make
- Zapier and Make — connect Square to thousands of apps with simple triggers (“new Square payment → add a row”). Good for basic field-mapping, but they move data between apps rather than reasoning about it.
The AI way to connect Square to anything: Carly
Native connectors cover the big accounting, e-commerce, and shipping tools. But the moment you need Square tied to a tool that isn’t in the marketplace — or you want something smarter than “new sale → copy a field” — you’ve hit the ceiling of native integrations and no-code triggers.
Carly is an AI executive assistant that connects to 200+ tools — Square included — and lets you bring your own API key to connect to anything else with a REST API. Instead of a fixed catalog, you get an agent that:
- Acts on triggers, 24/7 in the cloud — when a large sale lands, a refund posts, or inventory dips below a threshold, Carly does the next step without you in the app.
- Reasons over your data — not just “copy this field,” but “read yesterday’s Square sales, flag the top three items, and email me a summary with what to reorder.”
- Ties Square to the rest of your stack — a new transaction becomes one step in a workflow that also touches email (Gmail and Outlook), calendar, your CRM, and tasks.
- Builds the workflow from a plain-English description — tell it “when a Square order over $200 comes in, message my ops channel in Slack and create a fulfillment task” and it interviews you, then builds it.
AI agents start at $35/month, and steps in a workflow that don’t use AI run free and unlimited.
Carly also integrates with Square.
How to connect Square to a tool with no native integration
- In the Square Developer Dashboard, create an application and generate an access token (a personal access token for your own account, or an OAuth token for broader access) — sent as a bearer token on every API call.
- Paste your Square access token into Carly on the integrations page.
- Describe the workflow in plain English, and Carly builds it — connecting Square to whatever else you need, on triggers, without your laptop open.
Frequently Asked Questions
Does Square have integrations?
Yes. Square’s App Marketplace grew to nearly 1,000 partner integrations in 2026, covering accounting (QuickBooks, Xero, Restaurant365), e-commerce (WooCommerce, Wix, Ecwid), fulfillment (ShipStation, Shippo, Etsy, Printful), inventory and payroll (Thrive, Gusto), and marketing (Square Marketing, Mailchimp), plus Zapier and Make for no-code automation and a public REST API for custom connections.
What is the best Square integration for automation?
For simple triggers, Zapier or Make covers most apps. For automation that acts on triggers and reasons over your sales data — and to connect Square to tools with no native integration — an AI agent like Carly connects via your Square access token and runs workflows in the cloud.
How do I connect Square to an app that isn’t listed?
Use Square’s REST API. Create an application in the Square Developer Dashboard, generate an access token, then hand it to a platform that supports bring-your-own-API-key connections — Carly does this and can wire Square to any tool with an API.
How much does an AI automation for Square cost?
Carly’s AI agents start at $35/month, with non-AI workflow steps running free and unlimited. Your Square account and payment processing fees are separate.
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