szum.io

What It Is

szum is a data visualization rendering service built for product and content scenarios, with the core idea of “Same chart, everywhere.” Developers can use a JSON-style configuration to generate PNG/SVG charts via URL, API, or the TypeScript SDK, then embed them in <img>, Markdown, Notion, emails, Slack, or anywhere else that can display images. It is more like chart-rendering infrastructure than a traditional BI tool.

Core Features and Developer Experience

Based on the available materials, szum supports keyless rendering via GET URLs, as well as production use through API-key authenticated POST requests and the @szum-io/sdk TypeScript SDK. Its chart syntax covers marks, scales, axes, colors, themes, sizing, and other configuration options, with built-in combinations for common chart elements such as bar, line, dot, area, pie, rule, and text. It includes 6 built-in themes, while Pro users can use custom themes and Google Fonts. The Figma plugin, MCP server, short links, and interactive embeds show that it targets designers, developers, and agent workflows alike.

Pricing and Billing

szum’s pricing emphasizes “usage, not seats.” The Keyless plan is free and requires no account, allowing 250 renders per IP per month. The Free account includes 5,000 renders per month, plus saved charts, short links, and interactive embeds. Pro costs $29/month, or the equivalent of $23/month when billed annually, and includes 100,000 renders; optional overage is available at $1/5,000 renders. A render means generating a PNG or SVG on the server. Views served from the CDN cache are not billed, making costs manageable for high-traffic static chart use cases.

Pros and Cons

The main advantage is how quickly you can get started: a single URL can return an SVG, and you can try it without signing up. Its API, SDK, Figma integration, and MCP support cover a broad range of workflows. Cached views are not billed, overage is opt-in, and billing transparency looks relatively strong. The documentation includes Quick Start, API, authentication, limits, errors, caching, and Cookbook sections, giving it a complete structure. The downsides are that the available text does not state whether it is open source or supports self-hosting, nor does it mention SDKs beyond TypeScript. On support, it only clearly states that Pro includes email support, while SLA details require contacting the team.

Who It’s For and Access from China

szum is a good fit for teams that need to reliably output charts in products, documentation, automated reports, emails, or collaboration tools, especially when designers and developers want to share the same chart syntax. If you need complex interactive analytics or private on-premise deployment, you will need to verify its capabilities further. Information on access from mainland China, payment methods, and compliant deployment is not present in the available text, so these remain unknown for now. Alternatives to compare include QuickChart, Vega/Vega-Lite, Observable Plot, Datawrapper, Flourish, and ECharts.