ChartURL
Turn data into image charts for emails, reports, and chatbots
About ChartURL
ChartURL is an API service that converts JSON data into rendered chart images via a single URL. Built as a drop-in alternative to the retired Google Image Charts API, it powers charts in transactional emails, Slack bots, mobile apps, and anywhere you need a picture instead of interactive JavaScript.
Pros & Cons
Pros
- Fills a genuine gap left when Google deprecated its Image Charts API in 2019
- Single URL output works everywhere — no JavaScript sandbox, CSP, or iframe trouble
- API-first design with templates makes it trivial to A/B test chart styles without touching production code
- Good fit for per-recipient personalized charts in transactional email workflows
Cons
- Pricing is not published — paid tiers require a sales conversation
- Smaller product team means slower feature velocity than venture-backed competitors
- Image-only output means no interactivity (hover, drill-down) that modern dashboards offer
- Limited public documentation compared to mainstream charting libraries
Key Features
Image Chart API
POST JSON data and receive a signed URL that serves a PNG chart — cacheable, shareable, and email-safe.
Chart Templates
Design charts once in the web builder, then swap data via API call to reuse the same visual style.
Slack Integration
Post charts directly to Slack channels or chatbot responses by returning image URLs in webhook payloads.
Personalized Emails
Embed per-recipient charts in HTML email with merge-tagged data for Mailchimp, Customer.io, SendGrid, etc.
Dynamic Parameters
Override titles, axes, colors, and series via query string so one template serves many use cases.
Rich Chart Types
Line, bar, pie, scatter, stacked, area, and combo charts with customizable legends, labels, and tooltips.
Self-Hosted Option
Enterprise tier supports running the renderer on your own infrastructure for data-sensitive workloads.
Cross-Platform Images
Output renders identically in Gmail, Outlook, iOS Mail, and any client that accepts PNG images.
Pricing
- Limited monthly chart renders
- Core chart types
- Community support
- Higher render quotas
- All chart types
- Email support
- Template library
- Team accounts
- Priority support
- Advanced customization
- Larger quotas
- Self-hosted deployment
- SLA
- Dedicated support
- Volume discounts
Best For
Personalized Email Charts
Send weekly performance summaries or account analytics with a unique chart baked into each recipient's email.
Slack & Chatbot Reports
Have a bot respond to `/metrics` with an inline chart image pulled from your database in real time.
PDF & Printed Reports
Generate chart images server-side to embed in PDFs, invoices, or mailed reports without browser rendering.
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