Side-by-side comparison · Writing & Translation

GPTZero vs ProWritingAid

Everything that matters when choosing between them, in one place: our rating, what each can do, what they cost, and the trade-offs.

Best overall

GPTZero

4.2

From $0

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ProWritingAid

3.9

From $0

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Comparing 2 tools. Add one more if you like.

At a glance

GPTZero4.2

Best overallEasiest to use

Pick it if: Teachers, editors and business owners who want a second opinion on whether writing they've been handed came from AI.

ProWritingAid3.9

Pick it if: Authors, bloggers and anyone writing long documents who wants detailed feedback on style as well as typos.

Overview

Attribute	GPTZero	ProWritingAid
In one line	Checks whether text was written by AI, with plagiarism and citation checks too.	Grammar and style checker for authors, with in-depth reports on long manuscripts.
Pricing model	Freemium	Freemium
Starting price	$0	$0
Free plan	Yes	Yes
Works with Claude Code	Yes	No

Rating breakdown

Our scores out of 5. The higher bar in each row is highlighted.

Attribute	GPTZero	ProWritingAid
Overall rating	4.2Winner	3.9
Ease of useHow quickly someone non-technical gets value from it.	4.5	3.5
FeaturesHow completely it covers its own job, and how well the pieces fit together.	4.5	4.5
Output qualityHow good the results are before you fix them.	3.5	4.0
Value for moneyWhat you get for the price, including the free plan.	4.0	4.0
Speed & reliabilityHow fast it is and how often it falls over.	4.5	3.5

Feature comparison

A tick means it does this today. A dash means we haven't checked.

Attribute	GPTZero	ProWritingAid
Access & platform
Free plan	Yes	Yes
Mobile app	No	No
Desktop app	–	Yes
Browser extension	Yes	Yes
API access	Yes	–
Teams & business
Team workspace	Yes	No
Enterprise plan or SSO	Yes	–
Connects to other apps	Yes	Yes
Open source or self-hosted	No	No
AI abilities
Works with your files	Yes	Yes
Understands images	–	–
Makes images	No	No
Makes video	No	No
Writes code	No	No
Runs agents or automations	No	No
Learns your brand or style	–	Yes
Works in many languages	Yes	–
Capabilities score	8/ 17	6/ 17

Pricing

Plans as listed on each vendor's site when we last checked. Confirm before you buy.

Attribute	GPTZero	ProWritingAid
Plans	Free $0 Checking the odd document.	Free $0 Trying the reports on short pieces.
	PremiumOur pick $23.99/mo, or $12.99/mo billed yearly Teachers and editors checking work every week.	PremiumOur pick $30/mo, or $10/mo billed yearly ($120) Writers editing regularly.
	Professional $45.99/mo, or $24.99/mo billed yearly Agencies and heavy users scanning lots of files.	Premium Pro $36/mo, or $12/mo billed yearly ($144) Authors who want feedback and a community.
	Team Professional price per seat, 2 seats minimum Schools and businesses buying for a group.
Which plan to pick	Start on Free. If you check more than a few documents a week, Premium on yearly billing is the sweet spot. Professional only makes sense if you scan big batches of files.	Try Free on a chapter or a long blog post. If it clicks, Premium on yearly billing is good value, and the lifetime deal pays off after about three years. Premium Pro is for authors who want daily critiques and the workshops.

Key features

Attribute	GPTZero	ProWritingAid
Standout features	AI detection Plagiarism check Writing replay Citation and hallucination check Batch scans API and school integrations	Grammar and spelling 25+ writing reports Chapter Critique Rephrase and Sparks Story Canvas and Outline Crafter Works where you write

Pros and cons

Attribute	GPTZero	ProWritingAid
Pros	Clear sentence-level highlights, so you see exactly what looks AI-written Generous free plan for occasional checks Writing replay gives honest writers a way to prove their work Flags made-up citations, which most detectors don't API and batch scans for larger volumes	The most detailed style reports of any writing checker Explains its suggestions, so you improve over time Lifetime plan means no ongoing subscription Works in Word, Google Docs and Scrivener AI feedback built for fiction writers
Cons	False positives happen, and short or formal writing gets flagged more often Edited or reworded AI text can get past it The best scan and plagiarism checks need a paid plan Mostly designed around schools, so some features won't matter to a business	So many reports that it takes time to learn Monthly billing is expensive next to yearly Free plan is limited to 500 words per check Can feel slow on very long documents Overkill for quick business emails

Who each one is for

Attribute	GPTZero	ProWritingAid
Best for	Checking essays and assignments for AI writing Screening freelance or agency content Spotting made-up citations in reports Showing you wrote a document yourself	Editing a novel or long manuscript Finding repeated words and clunky sentences Learning to write better as you edit Editing inside Word, Google Docs or Scrivener
You'll find it used by	Teachers Editors Content agencies Recruiters Students	Novelists Bloggers Non-fiction authors Students Editors

Questions people ask

Which is better, GPTZero or ProWritingAid?

GPTZero scores highest overall in our ratings (GPTZero 4.2/5 and ProWritingAid 3.9/5). GPTZero is best for checking essays and assignments for AI writing and screening freelance or agency content. ProWritingAid is best for editing a novel or long manuscript and finding repeated words and clunky sentences.

Which is cheaper, GPTZero or ProWritingAid?

GPTZero: There's a free plan, and paid plans start at $0. ProWritingAid: There's a free plan, and paid plans start at $0.

Which is easier to use, GPTZero or ProWritingAid?

GPTZero rates highest for ease of use in our scores. Teachers, editors and business owners who want a second opinion on whether writing they've been handed came from AI.

Ratings are our own, from using each tool, across ease of use, features, output quality, value for money, speed & reliability.

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