SendLint is an autonomous QA agent for email. It reads your source deck, then checks copy, accessibility, links, rendering, spam triggers, and brand voice. It catches what checklists miss. One pass.
Checks
Stop juggling 5 tools. SendLint runs copy alignment, accessibility, links, rendering, spam, and brand voice in one pass.
01copy vs deck alignment
Upload your source deck alongside the email. The agent cross-references key messages, CTAs, stats, and claims. Drift gets flagged.
02accessibility wcag 2.1
Automated scan for contrast ratios, alt text, heading hierarchy, font sizes, table roles, and screen reader compatibility.
03link validation
Every URL crawled and verified. Broken links, redirect chains, UTM consistency, unsubscribe compliance — all caught before the inbox sees them.
04headless chromium render
Real screenshot of every email. Compare round-over-round with pixel-level diffs. The Outlook-risk overlay flags border-collapse seams, missing VML fallbacks, and GIF strip-down before send.
05spam & deliverability
Content-based spam scoring, image-to-text ratio analysis, blocklist checks, and authentication readiness.
06brand voice ai[new]
Upload 3-5 reference emails. Every new email is scored on tone, vocabulary, structure, and formality against your brand's actual voice.
Paste any email’s HTML, see what SendLint catches. No account, no card.
Workflow
Paste your email HTML and upload the source deck. Select your client and campaign version.
SendLint’s agent runs 100+ checks autonomously — copy, accessibility, links, brand rules, and more. No checklist. No human pass.
Review flagged issues with actionable guidance. Export the report as a PDF. Send.
Where this goes
Every marketing asset ships the same way: a human opens a checklist and eyeballs it. SendLint replaces that step with an agent that reads the source of truth, inspects the output, and flags everything that drifted. Email first, because email is irreversible. You can fix a landing page after launch. You cannot unsend two million emails.
Pricing
One plan with everything you need. Enterprise options for teams that need more.
For teams shipping production emails
$9,588/yr (save $2,268 vs monthly)
For teams with advanced needs
Tailored to your organization
Built by QA analysts tired of checking emails by hand.
Every check exists because we've watched one slip through and cause a real issue in production.
Catch it in the report, not in the inbox.