Third-party integrations as a growth channel

A third-party integration connects your product to a tool your customers already use, such as Slack, HubSpot or Zapier, so data and actions flow between them. Done well, it can make your product harder to rip out and puts it in front of that tool's users through its app directory. It pays off when your customers share a few common tools and your product sits next to them in the workflow. Plan on real maintenance, because every integration depends on someone else's API.

How to do it

1. Ask customers which tools they use next to yours. Look at support tickets, onboarding calls and cancellation notes. Build for the two or three tools named most.
2. Define the one job the integration does. For example: "when a deal closes in the CRM, create the project in our app" or "post new signups to a Slack channel". One job done reliably beats ten half-working ones.
3. Start with the cheapest route. A Zapier integration puts you in front of Zapier users with one build. A native integration with a single big tool gives a tighter experience. Pick based on what customers ask for.
4. Plan for the directory from day one. Marketplaces have review rules, so read them before you build.
5. Make setup take under five minutes: one "Connect" button, OAuth, and a test event that shows it worked.
6. Tell people it exists. Add the integration to onboarding, announce it to users of that tool, and give it its own page on your site.

What the marketplaces require

• Zapier will publish a public integration only when it is fully launched, with production endpoints, tested triggers and actions, and at least one successful run for every test Zap. You also need a valid test account and API documentation. See Zapier's publishing requirements.
• Slack reviews each Marketplace app manually, requires public distribution to be enabled first, and asks for security and compliance information at submission. See Slack's Marketplace guide.
• HubSpot manually reviews each listing. The listing's pricing must match your website, and you cannot combine "HubSpot" or "Hub" with your app name or logo. See HubSpot's listing requirements.

What it looks like in practice

Say you run a scheduling app. Customers keep asking for "Does it work with our CRM?" You build one sync: when someone books a meeting, a contact and a note appear in the CRM. Setup is a Connect button and a login. You add a short section to onboarding ("Connect your CRM"), a landing page for the integration, and a line in the CRM directory listing. You then check whether customers who connected the CRM cancel less than those who did not, before building the next one.

When it backfires

• You depend on someone else's API. Rate limits, changed endpoints and deprecations break your integration without warning. Budget ongoing engineering time.
• Directories reject or delist. The marketplace rules above are strict, and each is a gate you do not control.
• Support multiplies. Customers blame you when the other tool misbehaves. Write down which side owns which problem.
• Lock-in cuts both ways. The same sync that keeps customers can feel like a trap if exporting is hard. Keep export working.
• Too many shallow integrations. A long logo wall of connectors that barely work hurts trust more than a short list that works.
• Unproven retention claims. The idea that integrations reduce churn is common, but test it on your own data before you invest heavily.

For a similar bet on other companies' audiences, see co-marketing campaigns.

Sources

• Zapier publishing requirements, read Oct 8, 2026
• Slack Marketplace guide, read Oct 8, 2026
• HubSpot app listing requirements, read Oct 8, 2026