A SaaS marketplace platform is the app store sitting inside your software product: a place where outside developers list apps and integrations that extend what your core product does. Shopify has one, Salesforce has one, Atlassian and Slack have one. If you run a SaaS product with even a few hundred paying customers, building one is one of the highest-leverage distribution moves available to you.
The reason is simple. Every app a third party builds on your platform is a feature you didn’t have to ship, a reason for a customer to stay, and a new path for someone to discover you. The hard part isn’t the listing pages — it’s the plumbing underneath: developer onboarding, a review process that keeps quality high, and billing with revenue share that pays developers correctly and on time. This guide covers what a SaaS marketplace is, why companies build them, the building blocks, the revenue-share math, a step-by-step build, and the traps that catch most teams.
What is a SaaS / app marketplace?
A SaaS marketplace is a platform where third-party developers publish apps, plugins, or integrations that extend a core software product, and customers of that product install them. The marketplace operator owns discovery, the review process, and usually billing. Developers own the code and earn a share of revenue. It turns a single product into an ecosystem of products built on top of it.
This is a distinct thing from a general two-sided marketplace platform for goods or services, and from multi-vendor marketplace platform software for retail. Here the “supply” is software that plugs into an API, and the “demand” is your existing customer base. The product itself is the distribution channel.
Real examples of SaaS app marketplaces
The clearest examples are the app stores attached to large SaaS platforms. Each lets outside developers reach the host product’s customers, and each handles listings, review, and discovery in its own way. Studying how the big four are structured is the fastest way to learn the patterns you’ll copy.
- Shopify App Store — apps that extend Shopify stores (shipping, email, reviews, upsells). Shopify reviews submissions and bills merchants on the developer’s behalf.
- Salesforce AppExchange — one of the oldest enterprise app marketplaces, listing apps and consulting offerings that extend Salesforce CRM.
- Atlassian Marketplace — apps for Jira, Confluence, and other Atlassian products, with cloud and data center distribution and vendor payouts handled by Atlassian.
- Slack App Directory — bots and integrations that connect Slack to other tools. Many are free; the directory is built around discovery and an OAuth install flow rather than billing.
Why do SaaS companies build app marketplaces?
SaaS companies build app marketplaces to grow distribution, increase stickiness, and create ecosystem network effects they can’t build alone. Every published app is functionality the core team didn’t have to build, a reason customers stay longer, and a new acquisition channel. As more developers build, the product becomes more valuable to customers, which attracts more developers — a loop that’s hard for competitors to copy.
The three forces are worth separating.
Distribution. Developers who build on your platform have an incentive to send their own audiences to you. Their integration is also a reason your sales team can say yes to a prospect’s request instead of “that’s on the roadmap.”
Stickiness and retention. A customer running three or four installed apps has rewired their workflow around your product. Ripping that out to switch vendors is expensive, which lowers churn.
Ecosystem network effects. Above a certain density of apps, the marketplace itself becomes a selling point. Buyers choose the platform partly because of what’s available for it, the same way people once chose a phone for its app store.
The building blocks of a SaaS marketplace
A working SaaS marketplace needs five building blocks: developer onboarding, app listings with a review process, billing and revenue share, discovery and search, and ratings. Skip any one and the marketplace stalls — no onboarding means no supply, no review means low quality, no billing means developers won’t bother. Treat these as a system, not a feature list.
How does developer onboarding work?
Developer onboarding is the path from “I want to build on your platform” to a published, installable app. It needs API documentation, sandbox or test credentials, an OAuth flow so apps can request scoped access to a customer’s account, and a submission portal. The smoother this path, the more supply you get. Friction here is the single biggest cause of an empty marketplace.
Practically, you provide API keys, clear scope definitions for what data an app can read or write, and a test environment that mirrors production — so a developer can build and test an integration without touching real customer data.
How does the app listing and review process work?
The listing and review process governs what appears in the marketplace. A developer submits a listing — name, description, screenshots, pricing, requested permissions — and your team reviews it for security, functionality, and policy compliance before it goes live. Manual review protects quality early; automated checks (permission scope, broken installs, basic security scans) scale it later. This gate is what separates a trusted marketplace from a spam pile.
Most mature marketplaces combine automated tests with a human reviewer who checks whether the app does what it claims, requests only the permissions it needs, and lists accurate billing and support details. The same quality discipline applies to vetting any supply side in a multi-vendor marketplace platform.
How do billing and revenue share work with Stripe Connect?
Billing and revenue share are usually handled with Stripe Connect, which lets you charge the customer and split the payment between your platform and the developer in one transaction. You collect a single charge, take your platform fee, and route the remainder to the developer’s connected account. Stripe handles the payout mechanics; you set the split. This is the part teams most often underestimate.
Stripe Connect supports an application fee on each charge, so the platform’s cut is deducted automatically before the developer is paid out, and you can run subscriptions or one-time charges through the same rails. The mechanics of dividing one customer payment across multiple parties are covered in payment splitting.
How does discovery and search work?
Discovery and search are how customers find apps once supply exists. At minimum you need full-text search, categories, and a way to surface relevance — most-installed, highest-rated, staff picks, or “works with the features you use.” Without discovery, only the apps a developer markets themselves ever get installed, and the long tail of useful integrations stays invisible. Discovery is what makes a directory feel like a marketplace.
Good discovery also feeds your data: the categories customers search for but can’t find tell you exactly which integrations to recruit developers to build.
Why do ratings and reviews matter?
Ratings and reviews give customers the trust signal they need to install an app they didn’t build and can’t fully inspect. A star rating plus written reviews lets the marketplace police itself — bad apps surface low ratings, good ones rise. Ratings also create a feedback channel for developers and a quality signal you can use in ranking. They are cheap to add and disproportionately valuable.
Revenue-share economics
Revenue-share economics determine whether developers find it worth building on your platform at all. The operator takes a percentage of each app’s revenue — the take rate — and the developer keeps the rest. Set the take too high and developers stay away; set it too low and the marketplace doesn’t pay for the infrastructure and review work behind it. Most platforms land somewhere between keeping the developer’s incentive strong and covering their own costs.
Two costs eat into any revenue-share model and you should budget for both:
- Payment processing. According to Stripe’s published US pricing, online card payments cost 2.9% + $0.30 per successful charge. With Stripe Connect, additional fees apply for the platform features and payouts you use, so model the all-in cost, not just the headline processing rate.
- The cost of running the marketplace. Review, developer support, fraud handling, and the engineering to maintain the platform are real and ongoing. Your take rate has to cover them after processing fees.
The strategic question is what you’re optimizing for. If the marketplace exists mainly to make your core product stickier, a low take rate that maximizes app supply can be the right call — the apps are worth more as retention drivers than as a revenue line.
How to build a SaaS marketplace: step by step
Building a SaaS marketplace follows a clear order: validate demand, design the API and permissions, build developer onboarding, then add review, billing, discovery, and ratings. Build the supply-side tooling before the storefront — an empty marketplace with beautiful listings helps no one. Recruit your first developers by hand before you automate anything.
- Validate that customers want integrations. Look at the integration requests in your support queue and sales calls. Recruit three to five launch-partner developers before you build the platform.
- Design the public API and permission model. Decide what data apps can read and write, and define scoped OAuth permissions so customers grant only what an app needs.
- Build developer onboarding. Ship API docs, sandbox credentials, and a submission portal so a developer can build and test without real customer data.
- Add the listing and review process. Create the submission form (name, description, screenshots, permissions, pricing) and a review queue with security and functionality checks.
- Wire up billing and revenue share. Use Stripe Connect to charge customers, deduct your platform fee, and pay out developers. Decide subscription vs. one-time and set your take rate.
- Build discovery. Add search, categories, and ranking (most-installed, highest-rated, staff picks) so customers can find apps.
- Add ratings and reviews. Let customers rate and review installed apps to create trust signals and a quality feedback loop.
- Launch with your partner apps and measure. Go live with the apps you recruited in step one, then track installs, active apps, and which searches return nothing.
You don’t have to build all of this from scratch. The build-vs-buy trade-off applies here too — see the table below, and the broader landscape in marketplace software.
Build in-house vs. marketplace software
The build-vs-buy decision comes down to control versus speed. Building in-house gives you full control over the developer experience, billing logic, and review process, but it’s a multi-quarter engineering project. Existing marketplace and billing software gets you live faster and offloads payout complexity, at the cost of flexibility. Most teams start with as much off-the-shelf plumbing as possible and build custom only where it differentiates them.
| Factor | Build in-house | Use marketplace / billing software |
|---|---|---|
| Time to launch | Months — API, portal, billing, review all custom | Weeks — onboarding and billing largely pre-built |
| Control over developer experience | Full | Constrained by the provider’s model |
| Billing and payouts | You build splits and payouts (e.g. on Stripe Connect) yourself | Revenue share and developer payouts handled for you |
| Review and security tooling | Build your own queue and checks | Often included or available as add-ons |
| Maintenance burden | Ongoing, on your team | Largely on the provider |
| Best for | Platforms where the marketplace is core strategy | Teams testing demand or wanting to launch fast |
A common middle path: use Stripe Connect for the billing and payout layer (the hardest part to get right), and build the listing, review, and discovery experience yourself so it matches your product.
Pitfalls to avoid
The pitfalls that sink SaaS marketplaces are predictable: weak review quality, underestimated payout complexity, and developers who have no reason to build. Each is a system problem, not a one-time fix. Plan for all three before launch, because each one quietly kills supply or trust if you ignore it.
Letting review quality slip. A marketplace is only as trusted as its worst-rated app. If review is too loose, low-quality or insecure apps erode customer trust in the whole platform — and by extension, in your product. Keep manual review until automated checks are genuinely reliable.
Underestimating payout complexity. Splitting one customer payment across your platform and a developer, handling refunds, taxes, failed payouts, and currency, is harder than it looks. This is exactly why most teams lean on a payment facilitator or Stripe Connect rather than building payout infrastructure from scratch.
Ignoring developer incentives. Developers build where they can reach customers and earn enough to justify the work. If your take rate is too high, your install base too small, or your docs too painful, the marketplace stays empty. Recruit and support your first developers personally before expecting organic supply.
Where Twosided fits
Once your marketplace is live, the hard question shifts from “can we build it” to “is it working” — which apps drive retention, where supply is missing, how revenue share affects your numbers. Twosided connects to Stripe Connect in about five minutes and answers those questions in plain English, so you can run a SaaS marketplace by the data instead of by guesswork. Get started with Twosided for free.
FAQs
What is a SaaS marketplace platform?
A SaaS marketplace platform is software that lets third-party developers list apps, plugins, or integrations that extend a core SaaS product, and lets that product’s customers install them. The operator owns discovery, review, and usually billing; developers own the code and earn a revenue share. Shopify App Store and Salesforce AppExchange are well-known examples.
Why do SaaS companies build app marketplaces?
SaaS companies build app marketplaces for distribution, stickiness, and ecosystem network effects. Each third-party app is functionality the core team didn’t have to build, a reason customers stay longer, and a new way for people to discover the product. As more developers build, the platform grows more valuable, which attracts more developers — a loop competitors struggle to copy.
How does billing work in a SaaS marketplace?
Billing usually runs on Stripe Connect, which lets the operator charge the customer once, deduct a platform fee, and pay out the remainder to the developer’s connected account in the same transaction. It supports both subscriptions and one-time charges. According to Stripe’s published US pricing, card payments cost 2.9% plus $0.30 per successful charge, before any Connect-specific fees.
What is a good revenue share for an app marketplace?
There is no single correct number; the right take rate balances developer incentive against the cost of running the marketplace. If the marketplace mainly exists to make your core product stickier, a lower take that maximizes app supply often beats a higher take that scares developers away. Always model your take rate after payment processing and operating costs.
Should I build a SaaS marketplace in-house or use existing software?
Build in-house when the marketplace is core to your strategy and you need full control over the developer experience and billing. Use existing marketplace and billing software when you want to launch in weeks, test demand, or avoid building payout infrastructure. A common middle path is using Stripe Connect for billing while building listings, review, and discovery yourself.
What are the biggest pitfalls when building an app marketplace?
The three most common pitfalls are weak review quality, underestimated payout complexity, and ignored developer incentives. Loose review erodes trust in the whole platform; splitting payments across parties with refunds and taxes is harder than it looks; and developers won’t build without enough reach and a fair take rate. Plan for all three before launch.