# Development apps ranked on King of Apps > Development software helps teams write, build, test and maintain applications, services and other software code. Path: [IT Software](https://king-of-apps.vercel.app/category/it-software) > [Development](https://king-of-apps.vercel.app/category/development) _Data as of 2026-11-02T14:00:27.997Z. Ranks change whenever someone pays._ The #1 Development app is **Relaykit** (relaykit.dev), with $49 paid. 2 apps are listed in Development or one of its subcategories. Ranks are global: a category page filters the global board. The order reflects money paid, not quality. ## Development leaderboard | # | Overall rank | App | Domain | Description | Total paid | Clicks | Listed since | |---|---|---|---|---|---|---|---| | 1 | 9 | [Relaykit](https://king-of-apps.vercel.app/app/relaykit.dev) | relaykit.dev | API gateway with feature flags: route a percentage of traffic to a new version and roll back in one click. | $49 | 31 | 2026-11-02 | | 2 | 32 | [Buildr](https://king-of-apps.vercel.app/app/buildr.dev) | buildr.dev | No-code app builder that exports a real React project when you outgrow the drag-and-drop editor. | $6 | 2 | 2026-11-02 | ## Subcategories - [AI Code Documentation Tools](https://king-of-apps.vercel.app/category/ai-code-documentation-tools) (no apps yet) - [API Development](https://king-of-apps.vercel.app/category/api-development) (no apps yet) - [API Documentation Management](https://king-of-apps.vercel.app/category/api-documentation-management) (no apps yet) - [API Generation](https://king-of-apps.vercel.app/category/api-generation) (no apps yet) - [API Management](https://king-of-apps.vercel.app/category/api-management) (1 app, #1 is Relaykit) - [API Marketplace](https://king-of-apps.vercel.app/category/api-marketplace) (no apps yet) - [API Mocking](https://king-of-apps.vercel.app/category/api-mocking) (no apps yet) - [API Platforms](https://king-of-apps.vercel.app/category/api-platforms) (no apps yet) - [Application Development](https://king-of-apps.vercel.app/category/application-development) (1 app, #1 is Buildr) - [Backend as a Service (BaaS)](https://king-of-apps.vercel.app/category/backend-as-a-service-baas) (no apps yet) - [Cloud Platform as a Service (PaaS)](https://king-of-apps.vercel.app/category/cloud-platform-as-a-service-paas) (no apps yet) - [Communication Platform as a Service (CPaaS)](https://king-of-apps.vercel.app/category/communication-platform-as-a-service-cpaas) (no apps yet) - [Component Libraries](https://king-of-apps.vercel.app/category/component-libraries) (no apps yet) - [Crowd Testing Tools](https://king-of-apps.vercel.app/category/crowd-testing-tools) (no apps yet) - [Data Visualization Libraries](https://king-of-apps.vercel.app/category/data-visualization-libraries) (no apps yet) - [DevOps](https://king-of-apps.vercel.app/category/devops) (no apps yet) - [E-Signature APIs](https://king-of-apps.vercel.app/category/e-signature-apis) (no apps yet) - [Editor](https://king-of-apps.vercel.app/category/editor) (no apps yet) - [Feature Management](https://king-of-apps.vercel.app/category/feature-management) (1 app, #1 is Relaykit) - [Game Development](https://king-of-apps.vercel.app/category/game-development) (no apps yet) - [Geofencing](https://king-of-apps.vercel.app/category/geofencing) (no apps yet) - [Help Authoring Tool (HAT)](https://king-of-apps.vercel.app/category/help-authoring-tool-hat) (no apps yet) - [Integrated Development Environments (IDE)](https://king-of-apps.vercel.app/category/integrated-development-environments-ide) (no apps yet) - [Internal Developer Platforms](https://king-of-apps.vercel.app/category/internal-developer-platforms) (no apps yet) - [IP Address Intelligence](https://king-of-apps.vercel.app/category/ip-address-intelligence) (no apps yet) - [Load Testing Tools](https://king-of-apps.vercel.app/category/load-testing-tools) (no apps yet) - [Location Platform](https://king-of-apps.vercel.app/category/location-platform) (no apps yet) - [Notification Infrastructure](https://king-of-apps.vercel.app/category/notification-infrastructure) (no apps yet) - [Other Development](https://king-of-apps.vercel.app/category/other-development) (no apps yet) - [PDF SDKs](https://king-of-apps.vercel.app/category/pdf-sdks) (no apps yet) - [Portals](https://king-of-apps.vercel.app/category/portals) (no apps yet) - [Product Management](https://king-of-apps.vercel.app/category/product-management) (no apps yet) - [Release Notes Management](https://king-of-apps.vercel.app/category/release-notes-management) (no apps yet) - [Repository Management](https://king-of-apps.vercel.app/category/repository-management) (no apps yet) - [Requirements Management](https://king-of-apps.vercel.app/category/requirements-management) (no apps yet) - [Service Virtualization](https://king-of-apps.vercel.app/category/service-virtualization) (no apps yet) - [Software Development Analytics Tools](https://king-of-apps.vercel.app/category/software-development-analytics-tools) (no apps yet) - [Software Localization Tools](https://king-of-apps.vercel.app/category/software-localization-tools) (no apps yet) - [Software Supply Chain Security Tools](https://king-of-apps.vercel.app/category/software-supply-chain-security-tools) (no apps yet) - [Software Testing](https://king-of-apps.vercel.app/category/software-testing) (no apps yet) - [Test Management](https://king-of-apps.vercel.app/category/test-management) (no apps yet) - [Unified APIs](https://king-of-apps.vercel.app/category/unified-apis) (no apps yet) - [User Research Repositories](https://king-of-apps.vercel.app/category/user-research-repositories) (no apps yet) - [Video Platform as a Service (VPaaS)](https://king-of-apps.vercel.app/category/video-platform-as-a-service-vpaas) (no apps yet) - [Web Frameworks](https://king-of-apps.vercel.app/category/web-frameworks) (no apps yet) - [WebOps Platforms](https://king-of-apps.vercel.app/category/webops-platforms) (no apps yet) ## Related categories - [Analytics Tools & Software](https://king-of-apps.vercel.app/category/analytics-tools-software): Collects business data in one place so teams can measure performance and investigate changes before making decisions. - [AR/VR](https://king-of-apps.vercel.app/category/ar-vr): Creates software for augmented and virtual reality experiences that run on headsets, phones and other devices. - [Artificial Intelligence](https://king-of-apps.vercel.app/category/artificial-intelligence): Uses machine learning and other computational methods to analyze data, generate content and automate tasks. - [AI Development Services](https://king-of-apps.vercel.app/category/ai-development-services): Builds custom AI applications and integrations that apply machine learning to a company's specific workflows. - [AR Development](https://king-of-apps.vercel.app/category/ar-development): Gives developers tools for building augmented reality applications, experiences and interactive content. - [Cybersecurity Professional Development](https://king-of-apps.vercel.app/category/cybersecurity-professional-development): Helps security professionals build skills through courses, hands on practice and certification preparation. - [Development Services](https://king-of-apps.vercel.app/category/development-services): Development services build, customize and maintain software, websites or mobile applications for client organizations. - [Drupal Development](https://king-of-apps.vercel.app/category/drupal-development): Builds, customizes and maintains Drupal websites, modules, themes and integrations for business requirements.