An app marketplace turns your product into a platform. Instead of building every feature in-house, you let third-party developers extend your product through apps, integrations, and plugins. Done well, it creates a defensible moat: customers stay because the ecosystem meets needs your core team never could.
But app marketplaces fail more often than they succeed. The common failure modes are predictable: launching without enough apps to be useful, setting quality standards so low that the marketplace fills with junk, or making the developer experience so painful that nobody builds anything.
This template walks through the decisions you need to make before writing code: marketplace positioning, developer onboarding, app review and quality standards, revenue sharing, and discovery. Use it alongside the Product Strategy Handbook for broader positioning context. If you are also building a plugin system, the plugin system template covers the technical architecture side.
For estimating your marketplace's addressable market, the TAM Calculator can help you size the opportunity across potential app categories.
How to Use This Template
Define your marketplace positioning. What types of apps will you support? What problems do they solve that your core product does not?
Design the developer experience from signup to published app. Every friction point in this funnel reduces the number of apps in your marketplace.
Set quality standards and a review process. This is the hardest tradeoff: too strict and you have no apps, too loose and you have a junk marketplace.
Define the revenue model. Will you take a percentage of app revenue, charge developers a listing fee, or monetize indirectly through platform stickiness?
Plan discovery and distribution. Apps that nobody can find do not create platform value.
Review quarterly as your developer base and app catalog grow.
The Template
Marketplace Overview
Field
Details
Product Name
[Your core product]
Marketplace Name
[e.g., AppStore, Marketplace, Integrations Hub]
Author
[PM name]
Date
[Date]
Status
Draft / In Review / Approved
Marketplace Type
Integrations / Extensions / Themes / Full Apps
Current Stage
Planning / Beta / Public / Mature
Marketplace thesis. [One paragraph: why does your product need an app marketplace? What customer problems will third-party apps solve that your team cannot?]
App Categories
Define the categories your marketplace will support at launch. Resist the urge to launch with too many categories. Three to five focused categories with 5-10 quality apps each outperform 20 categories with one app each.
Category
Customer Problem
Example Apps
Priority
[Category 1]
[Problem]
[App 1, App 2]
Launch
[Category 2]
[Problem]
[App 1, App 2]
Launch
[Category 3]
[Problem]
[App 1, App 2]
Phase 2
[Category 4]
[Problem]
[App 1, App 2]
Phase 2
☐ Validate category priorities with customer research (which integrations are most requested?)
☐ Identify 3-5 launch partners per category who will commit to building apps
☐ Define the minimum viable catalog size before public launch
Developer Onboarding
Step
Description
Target Time
Owner
Registration
[Developer account creation]
[Minutes]
[Team]
Documentation
[API docs, SDK, quickstart guide]
[Time to first API call]
[Team]
Sandbox/Testing
[Test environment, sample data]
[Setup time]
[Team]
App Submission
[Review process, listing requirements]
[Days to approval]
[Team]
Publishing
[Go-live checklist, marketing support]
[Days post-approval]
[Team]
☐ Measure time from registration to first published app
☐ Identify the biggest drop-off point in the developer funnel
☐ Provide a sample app that developers can fork and modify
☐ Create a developer dashboard showing app installs, usage, and revenue
App Review Process
Review Stage
Criteria
Reviewer
SLA
Automated checks
[Security scan, API compliance, manifest validation]
System
[Minutes]
Functional review
[Does the app work? Edge cases? Error handling?]
[Team]
[Days]
UX review
[Consistent with platform design patterns?]
[Team]
[Days]
Security review
[Data access, permissions, vulnerability scan]
[Team]
[Days]
Content review
[Listing copy, screenshots, pricing accuracy]
[Team]
[Days]
☐ Define rejection criteria and provide actionable feedback templates
☐ Set an SLA for total review time (target: under 5 business days)
☐ Create a fast-track process for trusted/verified developers
☐ Document the appeals process for rejected apps
☐ Plan for review at scale (what happens when you receive 50 submissions/week?)
Quality Standards
Standard
Requirement
Enforcement
Performance
[Max load time, API response time]
[Automated monitoring]
Reliability
[Uptime commitment, error rate threshold]
[Health checks]
Security
[Data handling, encryption, OAuth scopes]
[Security scan + manual review]
UX
[Accessibility, responsiveness, error states]
[UX review checklist]
Support
[Response time for user issues, documentation]
[Quarterly audit]
☐ Publish quality guidelines publicly so developers can self-assess before submitting
☐ Define the process for removing or suspending apps that fall below standards
Marketplace thesis. TaskFlow users manage work across 8-12 tools on average. Our core product handles task management, but customers repeatedly request deeper integrations with their existing stack: Slack, GitHub, Figma, Salesforce, and time-tracking tools. Building and maintaining all of these in-house is unsustainable. An app marketplace lets partners build and maintain integrations while giving customers the connected workflow they need.
App Categories (Launch)
Category
Customer Problem
Launch Partners
Apps at Launch
Communication
Notifications and updates in Slack/Teams/Discord
Slack, Microsoft
3
Development
Sync issues with GitHub/GitLab, link PRs to tasks
GitHub, GitLab
2
Design
Import Figma frames, link designs to tasks
Figma
1
Reporting
Export to Sheets/BI tools, automated reports
Google, Tableau
2
Time Tracking
Log time against tasks, billing integration
Toggl, Harvest
2
Revenue Model
Component
Details
Model
85/15 revenue share (developer keeps 85%)
Minimum price
Free or $5/workspace/month
Payment terms
Monthly, net-30, via Stripe Connect
First-year incentive
90/10 split for apps published in year one
Metrics Targets (12-Month)
Metric
Target
Published apps
50
Monthly installs
2,000
Developer activation rate
25%
App retention (30-day)
70%
Marketplace-attributed retention uplift
+8%
Tips for App Marketplace Strategy
Seed with first-party apps. Build 3-5 integrations yourself to prove the platform works and to set quality expectations. These also ensure your marketplace is not empty on day one. The PLG Handbook covers how to build adoption loops that apply to marketplace growth.
Optimize for developer time-to-value. The single best predictor of marketplace success is how quickly a developer can go from "I have an idea" to "my app is live." Track this metric obsessively and remove every unnecessary step.
Quality over quantity. A marketplace with 20 excellent apps outperforms one with 200 mediocre apps. Users who install a bad app blame your platform, not the developer.
Invest in discovery. The most common app marketplace failure is not "no apps." It is "apps exist but customers cannot find them." In-product contextual recommendations drive more installs than browse or search.
Treat developers as customers. Developer documentation, support, and experience are products. Assign a PM to the developer experience. Measure developer satisfaction the same way you measure end-user satisfaction.
Key Takeaways
Seed your marketplace with first-party apps to set quality expectations and avoid an empty launch
Optimize for developer time-to-value: registration to published app should take days, not weeks
Prioritize app quality over catalog size. Bad apps damage platform trust.
Invest in contextual in-product discovery, not just browse and search
Treat developer experience as a product with its own PM, metrics, and roadmap
About This Template
Created by: Tim Adair
Last Updated: 3/5/2026
Version: 1.0.0
License: Free for personal and commercial use
Frequently Asked Questions
How many apps do I need before launching publicly?+
Most successful B2B app marketplaces launched with 10-30 apps across 3-5 categories. The minimum viable catalog depends on your customer base: you need at least 2-3 apps per category that your most-requested integrations fall into. If 60% of your support tickets mention Slack, GitHub, and Salesforce integrations, those three alone might justify a public launch if each has a quality app.
Should I charge developers to list apps?+
For most B2B marketplaces, no. Charging developers to list reduces your app catalog and creates a barrier to entry. Revenue share on app sales is a better model because it aligns incentives: you only earn when developers earn. Consider listing fees only if you have a mature marketplace with more developer demand than you can review, and you need a quality signal.
How do I prevent apps from breaking when I update my platform API?+
Version your API and maintain backward compatibility for at least 12 months after deprecation notice. Provide a staging environment where developers can test against upcoming releases. Publish a changelog with at least 30 days notice before breaking changes. For critical partners, offer early access to pre-release APIs. The [two-sided marketplace template](/templates/marketplace-two-sided-template) covers the broader challenge of maintaining both sides of a platform relationship.
What is the difference between an app marketplace and a plugin system?+
An app marketplace is the storefront: discovery, distribution, reviews, payments. A plugin system is the technical architecture: APIs, hooks, sandboxing, permissions. You need both. The plugin system defines what apps can do. The marketplace defines how users find, install, and pay for them. Build the plugin system first, then layer the marketplace on top.
How do I handle apps that compete with my core features?+
Set clear guidelines upfront. Most platforms allow apps that extend core features but restrict apps that replicate them. For example, a project management tool might allow a time-tracking app (extension) but disallow a task management app (competition). Publish these boundaries in your developer guidelines and enforce them during review. Changing the rules after developers have built apps destroys trust. ---
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