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Open-source screen recorder built with web technology

Kap — Official Website
In 2026, Kap remains the gold standard for open-source utilities on macOS. It perfectly balances the 'it just works' philosophy with the depth required by technical users. While it lacks the advanced annotation features of paid competitors like CleanShot X, its completely free price tag, open-source transparency, and powerful plugin system make it unbeatable for developers, designers, and anyone who needs quick, high-quality captures without vendor lock-in. The separation of its web-based UI and native Swift recording engine delivers a modern experience that feels right at home on the latest macOS versions. If you don't need heavy editing tools or cloud hosting, Kap is the best screen recorder you can install.
brew install --cask kapKap is the definitive open-source screen recorder for macOS, celebrated in 2026 for blending web technologies with native performance. Created by Wulkano, a design-led open-source collective, Kap was born from the need for a lightweight, extensible tool that could bridge the gap between simple system recorders and heavy professional suites. By leveraging Electron for its sleek, minimalist interface and a custom Swift library named 'Aperture' for low-level capture, Kap delivers high-fidelity recording without the typical performance penalty of web apps. In the 2026 design landscape, Kap remains a critical tool for developers, designers, and support professionals who value speed and transparency. Unlike closed ecosystems, Kap’s robust plugin architecture allows users to push captures directly to services like Vercel, S3, or Giphy immediately after recording. It supports modern formats like APNG and WebM alongside standard MP4 and GIF, making it indispensable for creating high-quality documentation, bug reports, and social media content. As of 2026, the application (Version 3.6+) continues to be maintained by the community, offering a privacy-first, watermark-free experience that stands as the premier free alternative to paid tools like CleanShot X.
Kap is a fascinating case study in hybrid app development, proving that Electron apps can be performant if architected correctly.
Kap was founded around 2016 by Wulkano, a collective of designers and developers including Matheus and others active in the open-source community. It was created to solve the lack of simple, beautiful, and extensible GIF recorders for Mac. Over the last decade, it has evolved from a simple GIF maker into a robust video tool, consistently updating to support new macOS releases and Apple Silicon.
Kap uses a split architecture. The frontend interface (menus, editor, export) is built with **Electron**, **React**, and **Next.js**, allowing for rapid UI development and a beautiful aesthetic. However, the heavy lifting of screen recording is offloaded to **Aperture**, a Swift library custom-built by the team. This allows the app to use native AVFoundation APIs for high-performance capture, bypassing the typical performance bottlenecks of web-based recorders.
The plugin ecosystem is Kap's secret weapon. Built on **npm**, plugins allows JavaScript developers to write simple scripts that hook into the export process. This has created a rich library of extensions for services like Streamable, Giphy, Amazon S3, and clipboard manipulation. It essentially turns Kap from a tool into a platform, allowing workflows to be customized endlessly.
Looking forward, the Kap team continues to focus on stability and OS compatibility. Recent and future efforts revolve around deeper integration with macOS shortcuts, improving the efficiency of the export engine (FFmpeg updates), and ensuring the plugin API remains robust for new AI-driven workflows that users might build.
Kap goes beyond standard recording by offering a versatile export engine supporting GIF, MP4, WebM, and APNG formats. Technically, it uses FFmpeg under the hood to process raw captures into optimized files, allowing users to control frame rate (FPS) and resolution scaling before export. This matters for designers who need crisp, lossless loops for portfolios or developers needing compact WebM files for documentation. For example, a user can record a high-res UI interaction and immediately export it as a 60FPS MP4 for a presentation and a lightweight 15FPS GIF for a Slack message simultaneously.
The core differentiator of Kap is its Node.js-based plugin architecture. Users can install community-maintained extensions to automate post-processing workflows. Technically, these plugins intercept the file after recording, enabling actions like automatic uploading to AWS S3, Imgur, or Giphy, or copying the file buffer to the clipboard. This is critical for productivity, as it removes the manual step of dragging files to a browser. A developer, for instance, can record a bug reproduction, and the 'Kap to Vercel' plugin will automatically upload it and paste the public URL into their clipboard.
While Kap's interface is built on Electron, the actual screen recording is handled by 'Aperture', a custom Swift library developed by Wulkano. This separation ensures that the heavy lifting of frame capture is done natively by macOS AVFoundation frameworks, keeping CPU usage low even during 4K recording. This architecture matters because it solves the 'laggy Electron app' stereotype, allowing users to record complex animations or code scrolling without dropped frames. It seamlessly bridges the ease of web tech with the power of native code.
Kap offers a precision snapping tool that automatically detects window borders and standard aspect ratios (16:9, 4:3, 1:1). Users can manually type specific dimensions or snap the recording frame to a specific application window. This is vital for maintaining consistency in tutorial series or product demos where uniform video dimensions are required. A social media manager, for example, can quickly toggle the '1:1' preset to record a square video specifically optimized for an Instagram or LinkedIn feed update.
Before exporting, Kap presents a lightweight editor window that allows users to trim the start and end points of a clip. It also includes options to crop the video frame post-capture. Technically, this non-destructive editing relies on the buffered video data, ensuring no quality loss before the final render. This feature saves users from opening heavy video editors like Premiere just to cut out the awkward 'start/stop' moments of a recording, streamlining the workflow for quick shareable clips.
A frontend developer needs to document a UI regression in a React application. They launch Kap via the global hotkey and snap the recording frame specifically to the browser window to exclude desktop clutter. After recording the bug interaction, they use the trimming tool to cut out the initial setup pause. Leveraging the 'Kap to Clipboard' workflow, they export the clip as a WebM file. Kap automatically saves the file and copies the data to the clipboard, allowing the developer to paste the video directly into a GitHub issue comment without manual file handling.
A product designer is creating a showcase of micro-interactions for their portfolio. They need high-quality visuals that don't suffer from compression artifacts. Using Kap, they set the recording to 60 FPS and capture the animation. Instead of a standard MP4, they choose to export as an APNG (Animated PNG), which supports 24-bit color and transparency. The resulting file preserves the subtle shadows and transparency effects of the design. They then use a custom plugin to upload this asset directly to their team's design system documentation, ensuring the asset is pixel-perfect.
A support agent receives a ticket about a confusing settings menu. Instead of writing a long email, they open Kap and select the relevant portion of the screen. They record a 15-second voice-over explaining the correct setting using the microphone input feature. After stopping the recording, they export it as a small, highly compressed MP4 suitable for email attachments. The entire process takes less than a minute, and the customer receives a clear, visual guide that resolves the ticket instantly, improving satisfaction scores.
Kap can be installed via direct download or package manager. The Homebrew method is recommended for easier updates.
Open your terminal and run: brew install --cask kap
Alternatively, download the latest .dmg file from getkap.co and drag it to your Applications folder.
On first launch, follow the macOS prompts to grant 'Screen Recording' and 'Microphone' permissions in System Settings.
Navigate to Preferences > General and check 'Show mouse cursor' and 'Highlight clicks'. This adds a visual circle around your mouse clicks in the final video, which is essential for instructional videos and tutorials.
In Preferences > Recording, set your default FPS to 30 for standard screencasts. Only bump it to 60 FPS for high-motion content like gameplay or UI animation, as 60 FPS significantly increases file size and rendering time.
Go to the 'Plugins' tab in Preferences to configure auto-export behaviors. You can set specific plugins to trigger only for certain formats—for example, automatically uploading GIFs to Giphy while saving MP4s locally.
Kap dominates the free/open-source niche, but paid competitors offer more advanced editing and cloud hosting.
CleanShot X is the premium standard for Mac, costing a one-time fee (~$29) or subscription. Unlike Kap, it includes a robust annotation tool (arrows, text, blur) and scrolling capture. Kap is better for users who want free, open-source software, while CleanShot is better for power users needing all-in-one editing.
Loom focuses entirely on cloud hosting and async communication. While Kap processes files locally, Loom uploads instantly as you record. Loom is superior for teams needing comment threads on videos, but Kap is better for privacy-conscious users who want full ownership of their files without a subscription.
Apple's native QuickTime is free and pre-installed but lacks Kap's advanced export options (GIF/WebM) and area snapping. Kap is essentially a 'QuickTime Pro' experience; use QuickTime only if you cannot install third-party software or need raw, uncompressed MOV files.
Kap is completely free to use under the MIT License. There are no paid tiers, watermarks, or time limits. The project is sustained by the open-source community and Wulkano. All features, including the plugin system, 4K recording, and commercial format exports, are available to every user immediately upon installation.
Kap has a vibrant, albeit niche, community centered around its GitHub repository. With over 18,000 stars on GitHub, it is one of the most popular open-source Mac utilities. Support is primarily handled through GitHub Issues and Discussions, where the maintainers and community members are highly active. There is no dedicated 24/7 support team, but the documentation is excellent, particularly for developers looking to write their own plugins. The ecosystem includes dozens of community-contributed plugins, ensuring that if a feature is missing, a developer has likely already built an extension for it.
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In 2026, Kap remains the gold standard for open-source utilities on macOS. It perfectly balances the 'it just works' philosophy with the depth required by technical users. While it lacks the advanced annotation features of paid competitors like CleanShot X, its completely free price tag, open-source transparency, and powerful plugin system make it unbeatable for developers, designers, and anyone who needs quick, high-quality captures without vendor lock-in. The separation of its web-based UI and native Swift recording engine delivers a modern experience that feels right at home on the latest macOS versions. If you don't need heavy editing tools or cloud hosting, Kap is the best screen recorder you can install.
Creative Software Expert
Last verified: Feb 15, 2026
Accessed Feb 15, 2026
Accessed Feb 15, 2026
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