Tools ranked by security headers

Tools ranked by the security headers their websites send. Checked automatically, re-checked every week, never paid for.

The letter grades the security headers a tool’s website sends, out of 100.

The bar under each tool is the nine checks, sized by weight: filled when the header is there, empty when it is missing. Missing headers open the door to man-in-the-middle attacks, malicious JavaScript, redirected forms and hijacked payments. How each one works, and how buyers put this in an RFP.

  1. Grade A, 85 out of 100.

    Grammarly grammarly.com

    Writing assistant that checks grammar, spelling, punctuation and tone as you type, through browser extensions, desktop apps and a mobile keyboard.

    writing-docs · 7 of 9 headers · checked 2026-10-06

  2. Grade B, 70 out of 100.

    Runhild by Perunlight perunlight.com

    Maker submission from Perunlight: Runhild maps CSV/XLSX rows into supplied DOCX templates for draft handover packets. Local browser tool, $9.99 once. Full flow checked in Chrome on Linux; Windows Edge startup only, Word rendering unverified. No legal, tax or accounting checks.

    writing-docs · 6 of 9 headers · checked 2026-10-10

  3. Grade C, 65 out of 100.

    SkrivSikkert skrivsikkert.dk

    Provider submission: Danish writing support for people with dyslexia, combining explained corrections, read-aloud and document answers with highlighted sources. Web app and Chrome extension; freemium with usage limits and optional Pro.

    writing-docs · 6 of 9 headers · checked 2026-10-05

  4. Grade F, 5 out of 100.

    Docusaurus docusaurus.io

    Docs sites with versioning, i18n, and search working out of the box from plain Markdown.

    writing-docs · 1 of 9 headers · checked 2026-10-04

  5. Grade F, 5 out of 100.

    iA Writer ia.net

    Markdown editor with focus mode and Authorship, which colour-codes pasted or AI text against what you typed.

    writing-docs · 1 of 9 headers · checked 2026-10-04

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