TestSubject

Mock-ups of an email's subject line, sender name and preheader as they show up in phone inboxes.

Artifact by ZURB

IndexedLicense unknownSEO & marketingNo sign-up

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Opens legacy-zurb.netlify.app in a new tab. Nothing to install.

Open TestSubject

You provide: Subject line, sender, preheader
You get: Device previews
Account: No sign-up needed
AI: No AI: a plain tool
Your input: Not stated: check the tool's privacy notes before using private data
Price: Free to use
Made with: Hosted web tool
Source: Source code not public
Link check: Answered on Oct 31, 2026

About

TestSubject is a hosted web tool in the seo marketing category (subject line preview). It opens in your browser, so there is nothing to install. You provide subject line, sender, preheader and get device previews. It needs no account. It is a plain tool: no AI model is involved.

Category: SEO & marketing · subject line preview

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Details

Auth: No auth
License: License unknown
Website: legacy-zurb.netlify.app/playground/testsubject
First seen: Oct 31, 2026
Last checked: Oct 31, 2026
Source: artifact-seed

Cite this page

TestSubject: free online tool. Agent Mart. https://agentmart.dev/artifacts/testsubject (last updated 2026-10-31)