# SparkPost/heml

HEML is an open source markup language for building responsive email.

Repository: https://github.com/SparkPost/heml
Canonical: https://ross.abutalabs.com/products/heml
Homepage: https://heml.io
Language: JavaScript
License: MIT
License Family: permissive
Topics: email, markup-language, framework, sparkpost, responsive-email, team-fe
Last push: 2020-02-09T16:13:55+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3250, "days_push": 2397, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4298, forks 156 (observed 2026-08-28T04:08:41.542009+00:00)

## What it is
HEML is an open source XML-based markup language and framework for building responsive HTML emails, developed by SparkPost. It compiles HEML elements and CSS into email-client-compatible HTML, handling quirks across dozens of email clients.

## Use cases
- build responsive html emails
- create email templates that work across clients
- convert a markup language into email-safe html
- design marketing emails without dealing with email quirks
- extend email elements with custom components

## When to choose
- you know HTML and CSS and want a native-feeling way to build emails
- you need responsive emails that render consistently across email clients
- you want an extendable markup language for email templating

## When to avoid
- you need a tool with active development and recent releases
- you prefer template systems integrated into your existing web framework
- you need drag-and-drop visual email building rather than code

## Facets
- artifact type: framework
- maturity: maintenance
- function: templating, email, build-tool
- domain: email, web-development, frontend
- platform: cli, cross-platform
- tags: responsive-email, markup-language, email-templates, html-email, sparkpost, nodejs

## Member repositories
- SparkPost/heml (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:41.542009+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:21:51.623901+00:00, confidence not recorded.
  - readme: https://github.com/SparkPost/heml (fetched 2026-08-28T04:08:41.542009+00:00, sha 046ead79416f)
  - homepage: https://heml.io (fetched 2026-08-29T09:11:23.454519+00:00, sha 870bd4b9d7c4)
  - site_page: https://heml.io/docs/getting-started/guide (fetched 2026-08-29T09:11:23.463197+00:00, sha f18be39b8748)
  - site_page: https://heml.io/docs/getting-started/overview (fetched 2026-08-29T09:11:23.465154+00:00, sha da721c93e0e7)
  - registry_npm: https://registry.npmjs.org/heml (fetched 2026-08-29T09:11:23.466898+00:00, sha 6a10fe21b56c)
- Data as of 2026-08-30T08:39:29.467469+00:00.