How do their growth rates compare?

GPTZero has a month-over-month growth rate of +32.5%; TimelyGrader has +108.8%.

How does pricing compare?

GPTZero: Freemium, Paid. Freemium plus paid plans. A free tier provides core detection with character limits per scan, while paid individual and institutional plans unlock advanced scan modes, higher limits, writing reports, and classroom integrations. Enterprise and API access are quoted separately. TimelyGrader: Freemium, Contact for Pricing. Free plan (no credit card, includes rubric generation and AI grading preview), Starter at $12/month or $10/month billed annually (about 17% off), and an Institution plan with LMS integration, admin controls and accreditation data export via Contact Sales.

What are alternatives to GPTZero and TimelyGrader?

Other tools in related categories include ZeroGPT, Scribbr, Undetectable AI, MagicSchool AI, Copyleaks.

GPTZero vs TimelyGrader — Traffic (23.25M vs 10.2K), Pricing & Verdict

Open AI Tools

GPTZero vs TimelyGrader — Traffic (23.25M vs 10.2K), Pricing & Verdict | Open AI Tools

Side-by-Side Traffic & Specification Matrix

Dimension / Metric	GPTZero	TimelyGrader
Official Domain	gptzero.me	timelygrader.ai
Pricing Model	Freemium, Paid	Freemium, Contact for Pricing
Monthly Visits	23.25M (23,246,989)	10.2K (10,198)
MoM Traffic Delta	+5.7M (+32.5%)	+5.31K (+108.8%)
Primary Market & Share	🇺🇸 United States (54%)	🇺🇸 United States (96.9%)
Direct Visits / mo	7.53M	7.83K
User Rating	4.1	4.3
Supported Platforms	Website	Website

GPTZero

AI detection and writing verification built for schools and editors

Sentence-level AI detection

Paste text or upload a document and get an overall AI probability score plus a sentence-by-sentence breakdown of which parts look machine-written.

Multi-model coverage

Flags AI text from major model families including ChatGPT, Gemini, Claude, Llama, and others, rather than training for a single model.

Browser and docs extensions

A Chrome extension and Google Docs add-on bring scanning into Gmail, Docs, Classroom, and other surfaces you already work in.

Plagiarism checking

Checks content for copied passages from outside sources so you can separate AI-generation questions from originality questions.

Strengths & Pros

+Sentence-level highlighting shows why a passage was flagged instead of only giving a score
+Covers text from many different AI model families, not just one chatbot
+Integrations with Chrome, Google Docs, Canvas, and Google Classroom fit existing school workflows
+Publishes concrete compliance claims (SOC 2 Type II, FERPA, GDPR, CCPA) that institutions can review