The humanizer API for automated content
That doesn't sound AI.
Your pipeline writes the draft. Sounday crosses out the AI tells, rewrites it to read human, and hands back every name, number and claim exactly as it was, with receipts.
10,000 words a month free. No card. API, MCP, CLI and CI.
In today's competitive job market, it is important to note that a well-crafted cover letter plays a crucial role. I rebuilt the reporting dashboard your team now uses for weekly reviews. From 2021 to 2024 I led analytics at Norte Foods under Ana López, leveraging a rich tapestry of cross-functional synergies.
- ✓ Ana López unchanged
- ✓ 2021–2024 unchanged
- ✓ Norte Foods unchanged
- ✓ no new claims
One call between “generated” and “published”.
Send plain text or Markdown. Get back the rewrite, a sentence-level diff, a before/after style score and facts_preserved, so your code decides what ships instead of a tired proofreader.
curl https://sounday.ai/v1/rewrite \
-H "Authorization: Bearer sd_your_key" \
-H "Content-Type: application/json" \
-d '{
"text": "In today’s fast-paced world, our running shoes play a crucial role...",
"keep": ["running shoes for flat feet"],
"strength": "standard"
}'What the red pen catches
Throat-clearing
Openers that warm up instead of starting. Your reader already knows it's a fast-paced world.
Brochure words
Delve, leverage, seamless, pivotal. Fine on their own. Exhausting as a team.
Flat rhythm
Every sentence the same length, every list exactly three items. We break the pattern, not the facts.
Every edit comes with receipts.
Humanizers that “improve” your prices are not humanizers, they're liabilities. Sounday checks both versions after every rewrite. If a fact would move, you get your original sentence back and a note saying why.
- Names, brands and peoplekept verbatim
- Numbers, prices and dateskept verbatim
- Links, code and your keywordsnever touched
- Claims, qualifiers and negationschecked by a second model
- Anything that fails a checkyour original sentence
Plugs into whatever writes your content
REST API
One POST. Plain text or Markdown in, verified rewrite and a diff out.
MCP server
Claude Code, Cursor or any MCP client calls Sounday while it writes.
CLI
Check or rewrite files from your terminal or build scripts.
GitHub Actions
AI tells annotated on the pull request. Fails the build under your bar.
n8n
Drop-in workflow for auto-blogging pipelines. Branch on facts_preserved.
Try the red pen on your own draft
Free and private: the style check runs in your browser, so nothing leaves this page. Same rules as the API and the CLI.
A style check, not an AI detector. It runs entirely in your browser, so your text never leaves your device.
Priced per word, not per vibe
Compare plans →Free
$0/mo
10,000 words a month
Builder
$19/mo
300,000 words a month
Scale
$79/mo
1,000,000 words a month
Guides
Auto blogging that doesn't read like auto blogging
A practical auto blogging workflow (n8n, scripts or agents) that generates, humanizes and fact-checks posts before they publish.
Common AI phrases to avoid (and what to write instead)
The phrases that make writing sound AI-generated, grouped by habit, with a plain-English alternative for each.
Does Google penalize AI content? What actually gets pages demoted
Google does not penalize content for being AI-written. It demotes unhelpful, mass-produced content. Here is the difference and what it means for AI-assisted SEO.
Does this sound like AI? 9 signs your writing reads machine-made
How to tell if a draft sounds like AI wrote it, why human writing gets mistaken for it, and what to change. Nine concrete signs with fixes.
How to make writing sound less like AI (a practical editing guide)
A step-by-step editing method to make AI-assisted drafts sound like a person wrote them, without changing your facts or adding mistakes.
Programmatic SEO without the AI tone: a humanizer step for your pipeline
How to add an AI humanizer to a programmatic SEO pipeline so generated pages read like a person wrote them, without breaking keywords, links or facts.
Words ChatGPT overuses (and plain-English replacements)
The words ChatGPT and other assistants reach for most often, why they stand out, and simpler words to use instead.
Questions
- Will the rewrite pass AI detectors?
- Sounday removes the signals that readers and AI-writing checks pick up: stock phrases, uniform rhythm, generic word choice. We show a before/after style score on every call. No tool can honestly guarantee what every detector will say about every text, so we don't, and you should be wary of anyone who does.
- How do you make sure facts don't change?
- Links, code, headings and your keep terms are swapped for placeholders before the model sees the text. After the rewrite we check every number, date and name against the original, and a second model checks claims, qualifiers and negations. A chunk that fails is retried once, then returned as your original.
- Is this OK for SEO?
- Search engines care about whether content is useful, not which tool typed it. Sounday makes generated drafts read better and keeps your target keywords verbatim. It does not make thin content helpful; that part is still on you.
- Do you store my text?
- No. Texts are processed in memory and never stored or logged. The free style check on this page runs entirely in your browser.
- Which languages work?
- Rewrites keep the language of the input, and English is where we have tested them most. The style check's phrase list is English-only for now.
Your facts stay. Your filler doesn't.
Free key in ten seconds. Paste it into your agent, script or workflow.