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Before a task goes to a plugin whose tab the browser has frozen, ask a wake agent to wake the tab and wait until the plugin can run again. A LivenessWaiter tells when the plugin of a session shows it can run: the first plugin message after the wait starts that leaves its connection unfrozen, or a new connection for the session completing its initialization, since a page resuming from a freeze may replace its WebSocket. The SessionWaker strategy makes sure a plugin can run a task before the task is sent. When the plugin is frozen or its heartbeat is stale, LocalSessionWaker asks the agent holding the session to wake the tab and waits for the session's next liveness signal. It then gives the page 250 ms to settle and returns the session's open connection, waiting for a new one when the page has closed its socket on resume, as Chrome does. The whole wait is bounded by 10 s. Without an agent, or when any step fails, the task fails with the same error as before. Concurrent tasks for one session share a single wake. The liveness check moves to PenpotConnection, so the waker can use it without the plugin bridge. sendLocalTask becomes asynchronous and waits for the waker. Both dispatchers await it. The task timeout starts once the task is sent, so a wake never replays a task that already timed out. When a plugin connection closes, its tasks still awaiting a response fail at once instead of at their timeout, since responses only count from the connection a task went to. A resuming page closes its old socket right after a last heartbeat, so a task may go out on it. Connections log their close code and reason, to tell a page closing its socket from a browser or network failure.
Website • User Guide • Learning Center • Community
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Penpot is the open-source design platform for teams that build digital products at scale.
Penpot’s key strength lies in giving you full ownership of your design infrastructure. Built on open source and designed for self-hosting, it puts teams in complete control of their design environment supporting strict compliance and governance requirements. Whether used in the browser or deployed on your own servers, Penpot works with open standards like SVG, CSS, HTML, and JSON.
Real-time collaboration strengthens this foundation, helping teams scale and bring design closer to the product through top-tier capabilities. Additionally, developers feel at home using Penpot, because design is expressed as code, enabling a direct translation and shipping products faster.
Best-in-class native Design Tokens provide a single source of truth between design and development. They ensure consistency, improve collaboration, and make it easier to manage complex design systems.
The MCP server takes it further by enabling multi-directional workflows between design and code. A powerful open API and plugin system makes the workspace programmable, enabling automation, AI-driven workflows, and integrations with the tools and systems you already use.
With CSS Grid and Flex Layout, teams can design responsive interfaces that behave like real code from the start.
Combined, these features turn Penpot into a full-stack design platform for building scalable design systems and fully integrated product development processes.
If your organization is scaling and needs extra support, we’re here to help. Talk to us
Table of contents
Why Penpot
Penpot connects design, code, and AI workflows through a code-based approach, making designs readable by developers and AI via the MCP server. This approach helps teams ship what’s actually designed and manage design systems at scale with powerful design tokens. As a self-hosted, open-source and real-time collaboration platform, Penpot offers full flexibility, security, and ownership without vendor lock-in. Learn more about why Penpot is the platform for your team.
Plugin system
Penpot plugins let you expand the platform's capabilities, give you the flexibility to integrate it with other apps, and design custom solutions.
Designed for developers
Penpot was built to serve both designers and developers and create a fluid design-code process. You have the choice to enjoy real-time collaboration or play "solo".
Inspect mode
Work with ready-to-use code and make your workflow easy and fast. The inspect tab gives instant access to SVG, CSS and HTML code.
Integrations
Penpot offers integration into the development toolchain, thanks to its support for webhooks and an API accessible through access tokens.
Building Design Systems: design tokens, components and variants
Penpot brings design systems to code-minded teams: a single source of truth with native Design Tokens, Components, and Variants for scalable, reusable, and consistent UI across projects and platforms.
Getting started
Penpot is the only design & prototype platform that is deployment agnostic. You can use it in our SAAS or deploy it anywhere.
Learn how to install it with Docker, Kubernetes, Elestio or other options on our website.
Penpot Enterprise
Penpot Enterprise is our paid plan for organizations that need to scale their design work across multiple teams with advanced governance, security, and administration. Manage teams and access from a centralized Admin Console, configure advanced permissions, and connect your identity provider through SSO. Available for cloud and self-hosted environments, it combines enterprise controls with Penpot’s open-source foundation and open standards.
Community
We love the Open Source software community. Contributing is our passion and if it’s yours too, participate and improve Penpot. All your designs, code and ideas are welcome!
Want to go a step further? Become a Penpot Ambassador and help grow the Penpot community in your region while contributing to a global, open design ecosystem.
If you need help or have any questions; if you’d like to share your experience using Penpot or get inspired; if you’d rather meet our community of developers and designers, join our Community!
Categories include:
- Ask the Community
- Troubleshooting
- Help us Improve Penpot
- Events and Announcements
- Penpot in your language
- Education
Code of Conduct
Anyone who contributes to Penpot, whether through code, in the community, or at an event, must adhere to the code of conduct and foster a positive and safe environment.
Contributing
Any contribution will make a difference to improve Penpot. How can you get involved?
Choose your way:
- Create and share Libraries & Templates that will be helpful for the community.
- Invite your team to join.
- Give this repo a star and follow us on Social Media: Mastodon, Youtube, Instagram, Linkedin, Peertube, X and BlueSky.
- Participate in the Community space by asking and answering questions; reacting to others’ articles; opening your own conversations and following along on decisions affecting the project.
- Report bugs with our easy guide for bugs hunting or GitHub issues.
- Become a translator.
- Give feedback: Email us.
- Contribute to Penpot's code: Watch this video by Alejandro Alonso, CIO and developer at Penpot, where he gives us a hands-on demo of how to use Penpot’s repository and make changes in both front and back end.
To find (almost) everything you need to know on how to contribute to Penpot, refer to the contributing guide.
Resources
You can ask and answer questions, have open-ended conversations, and follow along on decisions affecting the project.
✏️ Tutorials
🏘️ Architecture
🧑🏫 UI Design Course
License
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at http://mozilla.org/MPL/2.0/.
Copyright (c) KALEIDOS SUBSIDIARY SL
Penpot is a Kaleidos’ open source project