How can Zapier or n8n connect automation systems?

Zapier and n8n are middleware. They sit between two tools, watch one for a trigger, then push data to the other. You do not write code. You point and click.

Here is what that looks like in practice. Someone fills out your Typeform. Zapier sees the new submission, grabs the email and the answers, and creates a contact in your ESP (your email sending platform, like Klaviyo or Mailchimp) with tags based on what they answered. Or a customer buys on Shopify. n8n catches the order webhook, waits 14 days, then pushes them into a post-purchase review-request flow in your ESP. Or a deal in HubSpot moves to "Closed Won." Zapier flips the contact in your ESP from "prospect" segment to "customer" segment so they stop getting sales sequences.

The pattern is always the same: trigger in system A, action in system B, with a transformation step in the middle to rename fields, split full names, lowercase emails, or filter out junk.

When to pick Zapier

Zapier has 7,000+ pre-built app connections (Zapier app directory). If your stack is mainstream (Shopify, HubSpot, Klaviyo, Calendly, Stripe, Google Sheets), it is almost always already there. Setup is genuinely 10 minutes for a simple flow. The catch is cost: Zapier bills per task, and a task is one step. A flow that triggers on a new order, looks up the customer, filters by country, and creates a contact is four tasks per order. At 5,000 orders a month that is 20,000 tasks, which puts you on a paid tier fast.

Pick Zapier when the team has no developer, the volume is low to medium, and the apps involved are common SaaS tools.

When to pick n8n

n8n is open source. You can self-host it on a $5 VPS and run unlimited workflows for the cost of the server. It also has a cloud version if you do not want to host. The workflows are more flexible: real branching logic, loops over arrays, custom JavaScript steps when the no-code blocks are not enough. The trade-off is that the UI assumes you understand things like JSON, HTTP headers, and how webhooks work. A non-technical marketer will get stuck on day one.

Pick n8n when you have someone technical on the team, you are running high volume (think tens of thousands of events a day), or you need a transformation that Zapier cannot do without three workarounds.

What middleware does not fix

A few things to know before you build:

• There is a delay. Zapier polls most apps every 1 to 15 minutes depending on your plan. n8n with webhooks is near-instant, but polling triggers have the same lag. If a flow needs to fire within seconds (a password reset, a 2FA code), use a direct API integration, not middleware. See transactional notification flows for what belongs in this bucket.
• Bad data in, bad data out. If your form lets people type "john @ gmail . com" with spaces, Zapier will happily create a contact with that string. Validate at the source, or add a filter step.
• Every connection is one more thing that can break. Zapier's status page exists for a reason. Build error notifications into your flows so you find out when something stops, not three weeks later when sales asks why no leads came through.
• Middleware can pump bad addresses into your ESP fast. A form with no validation plus a Zapier sync can fill your list with typos and traps in a weekend. We wrote about this in risks of automation for deliverability.

If you are still figuring out what to automate before you pick a tool, start with triggers for email automation and the workflows every sender should have. Pick the flows first. Pick the plumbing second.

One last thing. Both tools support webhooks, which are the cleaner way to connect anything that emits them. A webhook is just your app POSTing JSON to a URL the moment something happens, instead of Zapier asking "anything new?" every 5 minutes. If your source system supports webhooks (most do), use them. See the IETF webhooks overview for the technical baseline.