ChartURL
Turn data into image charts for emails, reports, and chatbots
Founded
2017
Starting Price
$0
Category
API Development
Last updated April 20, 2026
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
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.
Pricing
Free
$0/month
- Limited monthly chart renders
- Core chart types
- Community support
Standard
Custom
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.
