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Pele is an open-source tool that converts Mermaid diagram syntax into SVG and lets developers style colors and fonts with CSS variables. Its website reports smaller bundles and faster rendering than Mermaid.js, but the figures are project-published comparisons and their test conditions are not specified in the supplied material.
Pele is an open-source renderer that converts Mermaid diagram syntax into SVG, with colors and fonts controlled through CSS variables. The project website describes it as a lightweight option developed for Obsidian, and reports smaller bundle size and faster rendering than Mermaid.js; the supplied information does not give the date or methodology behind those performance comparisons.
The tool’s workflow is to pass Mermaid text to Pele, which returns an SVG string for an application to insert into a page. The project shows a JavaScript example using the package’s `render()` API and says developers can install it from npm. That approach lets an app render diagrams without relying on Mermaid.js for the rendering step, according to the project description.
Pele’s site lists CSS properties for setting the diagram’s background, foreground, muted text, lines, surfaces and borders. It says these styling changes take effect without re-rendering. The project also presents light and dark themes, adaptive layouts for small screens, and examples of supported diagram types. It states compatibility with every diagram type built into Mermaid 12.1.0; the supplied material does not independently document that compatibility claim.
The project’s comparison table lists a 230 kB gzip bundle for Pele against 1.6 MB for Mermaid.js, zero direct dependencies against 23, and rendering times of 0.05–0.3 milliseconds against 6–82 milliseconds. Pele’s website characterizes the speed difference as up to 500 times. These are figures published by the project, not results accompanied in the supplied material by test details or independent verification.
SVG Styling Inside Host Applications
For developers building diagram features into software, Pele’s approach could make it easier to align diagrams with an application’s existing color palette and typography. Because the output is SVG and the styling is exposed through CSS variables, the project says an application can adjust appearance without rendering the diagram again. That may be useful in products with light and dark modes or user-configurable themes.
The reported bundle and speed figures also speak to practical concerns for applications that render diagrams on smaller devices or need to limit downloaded code. If those results hold under a project’s own workloads, a smaller package and faster rendering could reduce the cost of adding diagrams. The website’s table does not describe its test setup, however, so developers should treat the comparison as a project claim rather than a universal performance guarantee.
Pele’s stated origin in Obsidian points to a specific use case: rendering diagrams quickly while matching the host application’s theme. Its API and npm package may also make it relevant to other JavaScript applications, though the supplied source does not identify adoption figures, production users beyond that stated purpose, or measured effects on users.
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Built Around Mermaid Syntax
Mermaid is a text-based syntax for describing diagrams, including flowcharts. Pele’s site demonstrates a flowchart written in Mermaid notation and rendered as an SVG, positioning the tool as a renderer for familiar diagram input rather than a separate visual editor. Developers can supply the text through its API and place the returned SVG in a page.
The project describes Pele as open source and says it was developed for Obsidian, a note-taking application. It says the name refers to Pele, the goddess of volcanoes and fire. The project site also links to examples, API information, theming guidance and a compatibility comparison. No dated release announcement, version history or independent review was included in the supplied source material, so the timing and maturity of the current release cannot be established here.
““Color changes apply without re-rendering.””
— Pele project website
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Benchmark Methods Not Supplied
The supplied project information does not give a benchmark date, test environment, diagram sizes or measurement method for its bundle and rendering figures. It is also unclear how the comparison handles different rendering features or whether the reported times cover the same work for both tools. The numbers should therefore be attributed to Pele rather than treated as independently confirmed measurements.
The source says Pele supports every diagram type built into Mermaid 12.1.0, but it does not provide a test report showing coverage or explain whether compatibility includes identical layouts and behavior. No current version number, release schedule, maintenance commitments or adoption data appear in the supplied material. Those details remain unconfirmed.
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Check Compatibility and Releases
Developers interested in the tool can review Pele’s examples, API documentation and compatibility information on its website, then test their own Mermaid diagrams and themes before adopting it. The project’s npm installation and rendering example provide the stated integration path, but teams may want to compare output and performance against their own requirements.
The supplied source does not announce a forthcoming release, roadmap milestone or independent benchmark. Further information on versioning, supported diagram behavior and benchmark methods would help readers judge how the published comparisons apply to current applications. Until such details are available, the project’s stated capabilities and metrics remain the basis for assessing Pele.
JavaScript diagram rendering library
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Key Questions
What does Pele do?
Pele converts Mermaid syntax into SVG, which an application can insert into a page. The project provides a JavaScript API and says it is available through npm.
How does Pele handle diagram themes?
The project says developers can use CSS variables to set colors and fonts, including background, text, lines and surfaces. It says those color changes apply without re-rendering.
Is Pele faster than Mermaid.js?
Pele’s website reports rendering times of 0.05–0.3 milliseconds, compared with 6–82 milliseconds for Mermaid.js, and describes the difference as up to 500 times. The supplied material does not include benchmark methods or independent verification.
Which Mermaid diagram types does Pele support?
The project says it supports every diagram type built into Mermaid 12.1.0. The supplied source does not include an independent compatibility test or details on whether all layouts behave identically.
Who is Pele intended for?
Pele says it was developed for Obsidian to render diagrams quickly and match the application’s theme. Its API is presented for use in JavaScript applications more broadly, but the source provides no adoption data.
Source: hn
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