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Level 3 · Systems & AI

Build integrations

This playbook shows you how to tap into new, relevant audiences by making your product work seamlessly with the tools your customers already use. Instead of fighting for attention, you show up where your customers are already working. Building an integration gets your product listed in a partner's marketplace, giving you a steady stream of high-intent users.

Effort
High
Cost
Medium-High
Time to first result
3-6 months
Best for
SaaS, B2B Products
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An illustration showing two different software logos as puzzle pieces clicking together, with arrows indicating customer flow from one to the other.
Integrations turn a partner's user base into your user base.

Why Building Integrations Works

Partner marketplaces give you distribution and trust. When a user sees your app listed in a platform they already use and pay for, like Slack or HubSpot, you instantly borrow that platform's credibility. They trust you're legitimate, and they discover you in a moment of need--while they are looking for a way to extend the functionality of their existing tools. This is much warmer than a cold ad.

Integrations create a stickier, more valuable product. When your product is connected to a customer's other critical tools, it becomes part of their core workflow. This increases the value they get from your product and makes it harder for them to churn. A product that smoothly imports data from Google Sheets and sends notifications to Slack is more deeply embedded in a business than a standalone tool.

Three real examples

SaaSOver 2,400 apps in its directory

Slack's App Directory Drives a Flywheel

Slack's growth is famously tied to its platform strategy. By creating a simple API and a marketplace, they encouraged thousands of developers to build integrations. This made Slack the central hub for workplace communication, as it connected to every other tool a company used (like Google Drive, Trello, and Salesforce). Each new integration made the platform more valuable for users and attracted more developers, creating a powerful growth loop.

Source: Slack
Marketing TechOver 1,000 integrations

HubSpot Uses Integrations to Go Upmarket

HubSpot started by serving small businesses, but to attract larger customers, they needed to work with the tools those customers already used, especially Salesforce. Building a deep Salesforce integration was a key move that opened up the enterprise market. Now, HubSpot's App Marketplace is a core part of its value proposition, allowing users to connect it to any tool in their stack and making HubSpot the 'platform of record' for marketing and sales teams.

Source: HubSpot
Indie SaaSDozens of integrations built early on

Fathom Analytics Grows with 'Integrate Everything' Strategy

As a privacy-focused Google Analytics alternative, Fathom knew its customers were tech-savvy and used a variety of web frameworks and tools. From day one, they built and documented integrations with everything from WordPress and Ghost to Carrd and Webflow. This made it incredibly easy for people to switch, removing a major point of friction and signaling that Fathom 'fit' into their existing workflow, a key driver of their growth to over $1m ARR.

Source: Indie Hackers

Your own public API is a 'second-order' integration play. Once you have it, other companies can build integrations to you, and you can even build a Zapier integration that lets anyone connect to your product.

The step-by-step playbook

  1. 1

    Step 1: Find where your customers' data is 'trapped'

    Listen to your users. Where are they manually exporting data from your tool? Where are they copy-pasting information from? Use a tool like Tally.so to run a simple one-question survey: 'What other tools do you wish {My Product} connected with?'

  2. 2

    Step 2: Prioritize based on opportunity

    For your top 3-5 most-requested integrations, research their platforms. Do they have a public API? An app marketplace? How many users do they have? A good partner has a clear audience overlap with you and an established way for you to get in front of them.

  3. 3

    Step 3: Start with a 'shallow' integration

    Don't try to build a deep, complex integration first. Start with a simple one-way data sync or a notification system. Building on a platform like Zapier is the fastest way to validate an idea. If your 'Zap' gets hundreds of users, you know there's demand for a native integration.

  4. 4

    Step 4: Reach out to the partner

    Find a contact at the partner company--ideally a partnerships manager or product manager. Use the script below to propose the integration. Frame it as a win-win: you're building something that makes their platform more valuable to a shared customer segment.

  5. 5

    Step 5: Build and document the integration

    Build the minimum viable version of the integration. Just as important, write clear, step-by-step documentation with screenshots showing users exactly how to set it up. A confusing setup process will kill your adoption.

  6. 6

    Step 6: Get listed in their marketplace

    Work with your partner contact to get your integration approved and listed in their app marketplace. Optimize your listing with a clear value proposition, good visuals, and a link to your documentation. This listing is your primary acquisition channel.

  7. 7

    Step 7: Co-market the launch

    Don't just build it and hope they come. Coordinate a launch with your partner. This could include a joint blog post, a mention in their newsletter, social media posts, or a webinar. The goal is to make their audience aware that your solution now exists.

  8. 8

    Step 8: Measure and support

    Track how many users install the integration, how many of those convert to paid customers, and what the churn rate of those users is. Use a tool like June.so to monitor this. Also, be prepared to support the integration--it's now part of your product.

The Partner Outreach Template

Use this email to connect with a potential integration partner. Find the right person (Partnerships, Product, or even a founder) using Apollo.io.

Subject: Integration between {My Product} and {Their Product}?

Hi {FirstName},

My name is {My Name}, and I'm the founder of {My Product}, a tool that helps {Your Target Audience} with {Your Value Prop}.

I'm reaching out because many of our customers, like {Shared Customer Type}, also use {Their Product}. We're constantly getting requests to build an integration to connect our platforms and streamline their workflow.

We were planning to build an integration that would let users {Integration Use Case}, making both our products more useful for them.

Are you the right person to chat with about this? If not, could you point me in the right direction?

Thanks,
{My Name}

Questions to Ask Before You Start

  • Which platforms do our ideal customers use every single day?
  • Where are our users manually exporting/importing data right now?
  • Have customers explicitly asked for specific integrations?
  • Which potential partner has the most accessible API and marketplace?
  • Which partner has the biggest and most engaged user base that overlaps with ours?

The most important questions are about customer workflow. An integration that doesn't solve a real, existing pain of manually moving data is a solution in search of a problem.

Recommended tools

Zapier

From $29/mo

The fastest way to prototype and validate an integration idea without writing code. If people use your Zap, it's a great signal to build a native integration.

Apollo.io

From $59/mo

Use this to find the contact information for partnership managers or product managers at your target companies.

A simple and beautiful form builder. Perfect for running the one-question survey to ask your users what integrations they need.

June.so

From $39/mo

Track how many users adopt your integration and how they behave. Essential for measuring the ROI of your development effort.

Prices are indicative and change - check the vendor before buying.

Do it faster with AI Prompts

Brainstorm integration partners

I'm the founder of a SaaS product called '{My Product}'. We help {Your Target Audience} to {Your Value Prop}. Our core user workflow involves {Core Workflow}. Based on this, list 10 potential integration partners. For each partner, identify the shared customer profile and the specific problem an integration would solve for them.

Draft co-marketing copy

Write a 250-word blog post announcing a new integration between {My Product} and {Partner Product}. The tone should be enthusiastic and customer-focused. Explain the benefits, show a clear use case, and end with a call to action to try the integration now. Include a quote from each company's founder.

Outline integration documentation

Create a documentation outline for our new {Partner Product} integration. The user needs to authenticate, map some data fields, and then see the results. The outline should include a short intro, a 'What you need before you start' section, a step-by-step setup guide with clear action titles, and a short FAQ section covering common errors.

Mistakes that kill this play

  • Building without demand: Never build an integration just because it seems cool. Build it because multiple customers have asked for it.
  • No marketing plan: Simply listing your app in a marketplace is not enough. You need a plan to announce and promote the integration with your partner.
  • Underestimating support costs: Integrations break. APIs change. This is not a 'set it and forget it' project. You must allocate engineering time for maintenance.
  • Choosing the wrong partner: A partner with a tiny audience, poor documentation, or a bad reputation won't deliver results.
  • No clear ownership: Assign a single person to be the point of contact for the partnership and the success of the integration.
  • Ignoring documentation: If users can't figure out how to set up the integration in 5 minutes, they will abandon it.

Your First 7 Days

  • Day 1: Create and send a one-question survey to your users asking what integrations they want most. Use Tally.so for this.
  • Day 2: Analyze survey results. Research the top 3 requested platforms. Check their API documentation and marketplace guidelines.
  • Day 3: Create a simple spec document. What will the V1 of the integration do? What's the core user story? E.g., 'When I do X in Product A, Y happens in Product B'.
  • Day 4: Use Apollo.io to find the names and emails of 2-3 contacts at your #1 target partner company. Look for 'Partnerships Manager', 'Platform Manager', or 'Product Manager'.
  • Day 5: Customize the outreach email template from this playbook. Make it specific to them, showing you understand their product and customers.
  • Day 6: Send the outreach email. Set a reminder to follow up in one week if you don't get a reply.
  • Day 7: While you wait, scope out the engineering effort required to build the V1 integration. Get a rough estimate of the time and cost.
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