Free Writing Tools

AI Quality Checker and Paraphraser

Two tools to help students and researchers write in their own voice: check a passage for robotic AI-sounding phrasing, or paraphrase a sentence with every change highlighted for review.

Your text 0 words

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Robotic Tone Score

Higher = sounds more robotic/AI-like. Lower is better.

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out of 100

Flagged phrases–

Passive voice–

Sentence variety–

Repetition–

Line notes

Original text 0 words

INTENSITY

🔒 Runs entirely in your browser using a built-in synonym set. Nothing you paste here is uploaded or stored.

Rewritten version

Your rewritten text will appear here, with every swapped word highlighted so you can review it.

Swapped word

Robotic score — before–

Robotic score — after–

Why AI writing "sounds" different What the checker looks for Choosing a paraphrase intensity Using these tools responsibly Limitations FAQ

Why AI writing "sounds" different

Large language models are trained to produce smooth, low-risk prose. That gives their output a recognisable texture: a handful of favourite transition words, sentences that all land near the same length, heavy reliance on the passive voice, and a habit of restating an idea instead of developing it. Stacked together, these tics read as generic rather than argued — exactly what a thesis committee or journal reviewer is trained to notice.

Neither tool on this page tries to guess whether a model wrote your text. The Quality Checker looks for the same surface-level patterns a careful human editor would flag. The Paraphraser helps you rework vocabulary once you've decided a passage needs it. Together they're a starting point for revision, not a shortcut around it.

What the Quality Checker looks for

01 · PHRASING

Stock AI phrases

Words like "delve into," "in today's fast-paced world," and "unlock the potential of" show up disproportionately often in generated text.

02 · VOICE

Passive voice overload

Occasional passive constructions are normal. The checker flags passages where a clear actor has disappeared from most sentences.

03 · RHYTHM

Flat sentence rhythm

Human writing naturally varies sentence length. The checker measures how much your sentence lengths vary across the passage.

04 · REPETITION

Repeated key words

Reusing the same content words several times in a short span often means a paragraph is circling an idea instead of advancing it.

Choosing a paraphrase intensity

LIGHT

Small polish

Swaps a small number of words — good for polishing a sentence that's almost right, or avoiding repetition within a paragraph.

MEDIUM → HEAVY

First pass to full reword

Swaps a larger share of eligible words. Expect some synonyms to feel slightly off at Heavy — that's exactly what you should check and fix while revising.

Using these tools responsibly

1. Run the Quality Checker on one section at a time — 200 to 600 words gives the most useful read.
2. Where a phrase or passive sentence is flagged, rewrite it in language you'd actually use out loud, not a synonym swap.
3. If you use the Paraphraser, treat the output as a first pass — review every highlighted word and keep editing until it sounds like you.
4. Always cite the original source when paraphrasing someone else's published work; paraphrasing does not remove the need for a citation.
5. Follow your institution's or journal's policy on AI-assistance tools, and disclose their use where required.

Limitations — please read this

• Neither tool is an AI-detection tool. Neither reports a "percent AI" figure — no tool, including commercial detectors, can measure that reliably, and we won't fake a number that looks precise but isn't.
• The Quality Checker analyses style, not accuracy, argument quality, or citation integrity. Human writers, especially non-native English writers, can trigger its flags too — a flag is a prompt to look closer, not a verdict.
• The Paraphraser changes vocabulary based on a fixed synonym dictionary, not sentence context or meaning. It will not restructure an argument or fix logic.
• Neither tool is built or intended to help disguise AI-generated text as original work, or to help text evade a detector.

Frequently asked questions

Does a high Robotic Tone Score mean my text was written by AI?

No. The score reflects stylistic patterns commonly associated with generated text, not proof of authorship. Human writers can trigger these flags too, especially in first drafts or technical writing.

Will these tools help me pass a university AI-detection tool?

They're meant to help you notice and revise generic, undeveloped writing — the same habits that make prose weak whether or not AI was involved. They're not designed to help disguise AI-generated text as original work, and won't reliably defeat detection software.

Is my text stored anywhere?

No. All analysis and rewriting happens locally in your browser using JavaScript. Nothing is uploaded to a server or saved once you close or refresh the page.

Is a paraphrased sentence safe to submit as my own work?

Only once you've genuinely rewritten it in your own words and understanding. A synonym swap alone is not original writing, and paraphrased source material still needs to be cited.

Can I use these for academic writing?

You can use them to help draft and revise, but check your institution's or journal's policy on AI-assistance tools first, and always cite any source you're paraphrasing.

A note on academic integrity: if your institution or journal has a policy on AI use, follow it and disclose accordingly. These tools are meant to help you write more clearly and revise generic phrasing — not to help undisclosed AI content pass as your own original work.