htmlcsstoimage vs codetoimage — honest 2026 feature breakdown

Comparison · 2026-05-28 · 9 min read

If you're searching for "htmlcsstoimage alternative" you usually fall into one of two buckets: (a) you're a current customer feeling the entry price or hitting a feature edge, or (b) you're shopping for an agent-friendly stack and someone mentioned this one. Both buckets get an honest answer in this post. We build codetoimage, so the conclusion is biased in the obvious direction — but the supporting evidence isn't, and the sections where we tell you to stay on htmlcsstoimage.com are written for the same reason the rest of it is: you'll check, and we'd rather be correct than briefly convincing.

The short, headline-style version lives on our /compare/htmlcsstoimage page. This post is the long form: real engineering trade-offs, request shapes side by side, and migration notes that survive contact with production code.

Background — eight years vs five days

htmlcsstoimage.com launched in 2018. Mike Coutermarsh has been iterating on the same HTML-to-image problem for nearly eight years, and you can see the compounding everywhere — templates, webhooks, PDF output, a browser extension, a Zapier app, a public customer list, and a status page tradition that goes back years. Eight years of running a single-purpose API at scale is a moat. We are not pretending otherwise.

codetoimage went live on 2026-05-26. As of this post we're five days old. We have an API, a dashboard, billing, an official CLI on npm, an MCP server listed in Anthropic's registry, and a headless Chromium render pipeline behind it all. We do not have eight years of receipts and we will not have them for a while. If you're betting your business on an HTML render pipeline next week and you've never run on either of us, you should weigh that.

What follows is what each side actually does today, not what's on a roadmap.

Where htmlcsstoimage clearly wins

Templates. Their template system is the single biggest feature we don't have today. You define an HTML/CSS template once in their dashboard with Mustache-style placeholders ({{ title }}, {{ price }}), then POST against /v1/template/<id> with a JSON payload of variables. Marketing teams generating thousands of variants from a single design will feel this gap immediately on our side. If you're using theirs heavily, don't switch.

Webhooks for async renders. Their API lets you POST a render request with a callback URL and get the image delivered to your endpoint when done. For batch pipelines — overnight report generation, queue-based marketing automation — this removes the need to hold an HTTP connection open. We render synchronously today.

PDF output. They expose HTML-to-PDF, we don't today. If you need PDF and want one vendor for both surfaces, they're the answer.

Browser extension. They publish a Chrome extension that captures live web layouts and pushes them into their pipeline. There's no equivalent on our side. For designers who work visually first, that's a real workflow.

Zapier and Make integrations. Both listed on their landing. If your team's automation layer already runs through Zapier or Make and you want native steps rather than HTTP nodes, they win without contest. Our integration story is currently "use the CLI inside a shell step," which works, but it's not the same as a polished app card.

Output format breadth. They support PDF in addition to PNG, JPEG, WebP. We support PNG, JPEG, WebP.

Maturity. Eight years of uptime history, a customer reference list with named brands, a public status page. We're working on all of it. They have it.

Hosted MCP since January 2026. This one matters because we make a lot of noise about MCP and somebody is going to read this and assume we're claiming we invented HTML-to-image MCP. We didn't. They beat us to it by four months with a hosted MCP endpoint at mcp.hcti.io. The distinction between their MCP and ours is real, but it's a nuance — see the MCP nuance section below — not "we have MCP, they don't."

Where codetoimage wins

Entry price. Hobby is $7/month for 3,000 renders. Their cheapest paid tier is around $20/month for 1,000 renders. That's roughly a third of the per-render cost at the entry tier. If you're rendering under 3k images a month and you're cost-sensitive, the math is hard to argue with.

Free tier shape. Both free tiers are 50 renders/month, watermarked, with credit-card-optional sign-up on our side. Theirs has historically been 50 lifetime renders behind a card; we recurse monthly. Worth verifying current terms before you trust either, but the practical difference is: our free tier is for low-volume hobbyist projects to actually run on indefinitely, theirs is for evaluation.

Listed in Anthropic's MCP Registry. Search registry.modelcontextprotocol.io for "image" and we show up. They don't list there. If you're a developer wiring Claude Desktop, Claude Code, Cursor, Windsurf, Cline, or Zed via registry discovery, we're discoverable by name; htmlcsstoimage requires you to know about mcp.hcti.io and configure it manually. This is a real distribution gap today, and it's the one we expect to matter most as MCP-aware clients ship richer registry UIs.

Official npm CLI. @codetoimage/cli is a first-party package, MIT-licensed source on GitHub, designed to drop into CI and shell scripts in 30 seconds:

npm i -g @codetoimage/cli
cti login
cti render hello.html -o hello.png

htmlcsstoimage has community Python and Ruby wrappers but no official CLI. If your workflow leans on terminal-first or CI-first usage, that's our point.

Source-available clients. The CLI and MCP server are MIT on GitHub. You can read what we send, audit headers, vendor a fork if you want to. The server is closed (sensibly) on both sides, but the surface you actually integrate against is open on ours.

Hosted URL output mode. Pass output: "url" and we return a 24-hour hosted image URL instead of binary. Useful when downstream APIs expect URLs (Instagram Graph API, Slack unfurls, OG meta tags) rather than multipart uploads. They have a comparable hosted-URL mode. The feature exists on both sides; we just want to be explicit it isn't missing.

No cold starts, deterministic latency. The renderer is always warm — median ~600ms for a typical 1200×630 PNG, with low variance across requests. We don't yet have a public SLA — that's an honest gap — but the median response time and consistency are already documented on the landing page so you can sanity-check against your own workload.

The MCP nuance

This is the section where we have to be careful, because it's the one most likely to be re-quoted out of context. We do not have a monopoly on HTML-to-image over MCP. htmlcsstoimage shipped a hosted MCP server in January 2026, months before we existed. Here's how the two approaches actually differ:

Their MCP — hosted (HTTP/SSE transport). The server runs on htmlcsstoimage's infrastructure. Your client (Claude Desktop, etc.) connects over HTTP. You authenticate with an OAuth flow. Nothing installs locally. The upside: zero install, one connection. The downside: it depends on the client supporting HTTP MCP transport with the right auth shape, and you can't use it in workflows that aren't internet-resident at request time.

Our MCP — stdio over npx. @codetoimage/mcp-server runs locally as a process spawned by your MCP client. You add a JSON block to your Claude Desktop or Claude Code config:

{
  "mcpServers": {
    "codetoimage": {
      "command": "npx",
      "args": ["-y", "@codetoimage/mcp-server"],
      "env": { "CODETOIMAGE_API_KEY": "cti_live_..." }
    }
  }
}

The upside: it works in every MCP client we've tested, the auth is just an env var, and the server itself is a published npm package you can read. The downside: you do install the package the first time npx runs it.

And — only one of these is in Anthropic's official MCP Registry today. That's a real difference for discoverability in 2026, but it's not the same as saying "we have MCP and they don't." Pick by client preference and by how comfortable your team is with hosted-vs-local auth, not by us-vs-them rhetoric.

If you're building an agent product on top of either of us, see /use-cases/ai-agents for the longer write-up on which transport matters when.

Pricing math at three scales

Public pricing as of 2026-05-28. Both sides change tiers; verify before you commit.

1,000 renders / month

Winner: codetoimage. Roughly a third of the cost and you've still got 2,000 renders before you'd think about an upgrade.

5,000 renders / month

Winner: codetoimage, either through overage on Hobby or by moving to Pro. The gap narrows here but doesn't close.

25,000 renders / month

Winner: it depends. At 25k/month the price gap is still real, but you're now in the volume where their template system, webhooks, and PDF output start paying back the difference. If your 25k renders are 25,000 calls to the same template with different variables, htmlcsstoimage's pricing buys you a feature we don't ship today. If they're 25,000 unique HTML payloads from a code-generation agent, the cost-per-render math still favors us.

The pattern: lower entry tier favors us across the board; feature gap at the top end favors htmlcsstoimage. Pick by where your volume is going, not just where it is.

Migration: if you're switching today

Both APIs are POST-a-JSON-body shaped, which makes the actual migration a couple of sed passes for most clients.

URL. https://hcti.io/v1/image → https://api.codetoimage.app/v1/render

Auth. They use HTTP Basic with user_id:api_key. We use a single X-API-Key header.

Field names. Mostly identical:

Response. Theirs always returns JSON with a hosted URL. Ours returns binary bytes by default; pass output: "url" to get a JSON response with a 24-hour CDN-served URL instead.

Side by side:

# htmlcsstoimage
curl -X POST https://hcti.io/v1/image \
  -u "USER_ID:API_KEY" \
  -d 'html=<h1>Hi</h1>' \
  -d 'viewport_width=1200' \
  -d 'viewport_height=630'
# response: { "url": "https://hcti.io/v1/image/abc...png" }

# codetoimage
curl -X POST https://api.codetoimage.app/v1/render \
  -H "X-API-Key: cti_live_..." \
  -H "Content-Type: application/json" \
  -d '{"html":"<h1>Hi</h1>","width":1200,"height":630}' \
  -o out.png

# codetoimage, URL response (parity with hcti)
curl -X POST https://api.codetoimage.app/v1/render \
  -H "X-API-Key: cti_live_..." \
  -H "Content-Type: application/json" \
  -d '{"html":"<h1>Hi</h1>","width":1200,"height":630,"output":"url"}'
# response: { "url": "https://img.codetoimage.app/r/9f3c...png", "expiresAt": "..." }

Templates. If you use their templates feature today, the migration path is to inline the HTML back into your code (with your own variable substitution layer, e.g. a templating function in TypeScript). For low-variant, mostly-static templates this is fine; for high-variant marketing automation driven from a UI, stay on theirs.

When you should not switch

• You rely on their templates feature for variable-driven renders.
• You need PDF output today.
• Your team integrates through Zapier, Make, or Bubble.
• You need a public SLA in writing right now — we don't have one yet.
• You have a tight production integration with their webhook system.
• You've been running on them happily since 2018 and "if it ain't broke" is a real value in your stack.

If two or more of those apply, stay where you are.

How to evaluate this in 10 minutes

1. Sign up at codetoimage.app/signup. No credit card needed for Sandbox. You'll get an X-API-Key immediately.
2. Take the curl you currently use against htmlcsstoimage and rewrite it once. Use the field-name table above. Run it against api.codetoimage.app/v1/render. Confirm you get bytes back (or pass output: "url" to get a URL).
3. Time it. Loop 20 requests at your real payload size and check median + p95. Compare against the same loop on htmlcsstoimage. The numbers in our /compare/htmlcsstoimage page are our advertised baseline; your real network path is what matters.
4. Render your three highest-traffic templates. Pick the ones that are visually most demanding — custom fonts, heavy CSS, large viewports. Visually diff the output against what htmlcsstoimage produces. Pixel-identical isn't realistic across two Chromium versions, but functionally identical should be.
5. Decide on volume + features you actually use. If you're at 1-5k renders/month and you don't use templates, the answer is probably us. If you're at 25k+ and you live in their template system, the answer is probably them. The middle is judgment.

If you want the CLI version of the same evaluation, our CLI page walks through cti render hello.html -o out.png in under a minute — same renders, terminal instead of curl.