HTML to Image renders 1,000 images for $9 against Robolly's $39 entry plan, with raw HTML rendering and URL screenshots on the same key.
Disclosure: we built HTML to Image. We've kept this comparison honest because the alternative is search results full of low-effort listicles.
| Feature | Robolly | HTML to Image |
|---|---|---|
| Entry plan price | $39 / 250–1,000 renders (Individual) | $9 / 1,000 credits |
| Free tier | 7-day trial, no card | 25 images per month, no card |
| Named templates | Yes (editor, 50 on Individual) | 25 |
| Raw HTML support | No | Yes |
| URL screenshots | No | Yes |
| JavaScript execution | No | Yes |
| Webhook delivery | Not surfaced | Yes |
| Custom fonts | Yes | Yes |
| Per-seat charges | Team members on Business plan up | No |
| Best for | no-code render links and Google Sheets-driven image batches | developers rendering their own HTML with templates on the same key |
Stay with Robolly when your image generation lives inside no-code automations and the team designs in an editor. Render links slot neatly into Zapier, Make, Pabbly and Google Sheets, its signed-URL scheme keeps parameterised links safe in public, and the video add-ons cover short personalised clips. That is a coherent package for marketing automation.
Switch to HTML to Image when a developer owns the pipeline and the numbers matter. Robolly's entry plan is $39 for between 250 and 1,000 renders; ours is $9 for a straight 1,000, with a free tier that renews monthly rather than a one-week trial. Standard designs come from the 25 named templates, anything else is raw HTML in real Chrome, and URL screenshots ride on the same key — three capabilities Robolly's editor-template model does not cover.
A quarter of the entry price for up to four times the renders. $9 for 1,000 against $39 for 250 to 1,000, and $60 versus $129 at the 10,000 tier — see pricing. The free tier is permanent: 25 images a month, no card, no clock.
Raw HTML with JavaScript execution. Robolly renders editor templates only. Our HTML endpoint runs your markup in headless Chrome — charts, web fonts, dynamic layouts — with the 25 named templates covering the standard shapes without any markup at all.
URL screenshots and webhooks on every plan. Page captures share the key and credit pool, and webhook delivery covers async flows. Neither appears in Robolly's feature set.
The no-code render-link model. Parameters in a GET query string, HMAC-signed public links, repeat renders served from cache without touching quota, and tight Google Sheets, Zapier, Make and Pabbly integrations. For automation-platform workflows that is genuinely convenient.
Video add-ons. Short template-based videos from $14 a month on top of a plan. HTML to Image does not render video.
# Robolly (template render link)
curl "https://api.robolly.com/templates/your-template-id/render.png?title=Hello" \
-H 'Authorization: Bearer your-api-key'# HTML to Image (template render)
curl -X POST https://app.html2img.com/api/v1/templates/open-graph-image \
-H 'X-API-Key: your-key-here' \
-H 'Content-Type: application/json' \
-d '{"title":"Hello","subtitle":"From Northwind Studio"}'
Three concrete differences. HTML to Image is a POST with a JSON body rather than a GET render link with query parameters. Auth is an X-API-Key header instead of a Bearer token or signed link. And the response is a JSON envelope whose url points at the PNG on our CDN — store that URL once and reuse it, which replaces Robolly's render-link caching in practice. Confirm the designs you need exist in the templates gallery before migrating.
See the API parameters reference for the full request and response shape.
There is no crossover: HTML to Image is cheaper at every published point. Entry is $9 for 1,000 renders against $39 for a sliding 250 to 1,000. At 10,000 renders it is $60 here against $129 on Robolly Business. Robolly's render-link caching means repeat renders of identical links do not consume its quota, which narrows the effective gap for workloads that re-request the same image — though storing our returned CDN URL achieves the same result with no re-request at all.
HTML to Image is cheaper at every published point. Robolly's Individual plan is $39 a month with a render allowance sliding from 250 to 1,000; our entry plan carries a straight 1,000 renders for $9. At 10,000 renders Robolly's Business plan is $129 while ours is $60. There is also a persistent free tier of 25 images a month here, where Robolly offers a 7-day trial.
Not in the same GET-a-URL form. Robolly's render links put template parameters in a query string, which is convenient for no-code tools, and it caches repeat renders of the same link. HTML to Image is a POST-based API returning a CDN-hosted URL — a couple more lines in code, and the returned URL can be stored and reused indefinitely without re-rendering.
No. Robolly renders templates built in its editor, modified through parameters. There is no endpoint for your own markup and no URL screenshots. HTML to Image takes raw HTML with full CSS and JavaScript execution in headless Chrome, ships 25 pre-built named templates, and captures page screenshots from the same key.
Robolly offers video as paid add-ons ($14 to $79 a month on top of a plan) for short template-based videos. HTML to Image does not render video at all. If short personalised videos are part of the workload, Robolly covers it; for image work the comparison above applies.
The free tier covers 25 renders a month with no credit card. Try the API against your real data before deciding.
Twenty-five pre-built designs on every plan. JSON in, PNG out, and the returned CDN URL is yours to keep.