GPTZero vs Lilac

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

GPTZero compared with Lilac
Detail	GPTZero	Lilac
What it does	AI detector that identifies content generated by large language models	Outcome verification for AI agents
Stage	Not given	MVP
Founded	2023	Not given
Based in	Not given	Not given
Pricing model	Freemium	Not given
Pricing	Free tier for basic AI detection up to 10,000 characters. Professional plan available with pricing details on subscription page. API pricing available for developers.	Not given
Key features	AI detection with 99.9% accuracy Sentence-by-sentence highlighting of AI-generated text Writing Replay showing video proof of writing process Plagiarism detection Grammar checking and writing feedback Chrome extension for browser-based scanning Integration with Canvas and Google Classroom API for developer integration Detects multiple AI models including GPT-5, GPT-6, Gemini, and Claude AI Tutor for writing improvement	Determines if agents are serving user intents Verifies task completion Distinguishes between error-free runs and actual user satisfaction
What makes it different	99.9% accuracy rate verified by independent benchmarks from Penn State's AI Research Lab De-biased for ESL learners with only 1% false positive rate for non-native English writing Only detector with Writing Replay showing video proof of authentic writing process Trusted by over 10 million users and 100+ organizations globally	Verifies actual agent outcomes rather than just technical success
Community votes	0	0
DR (Domain Rating by Ahrefs)	81 no change since last check	Not checked yet no change since last check
Trust Flow (Majestic)	27	0
Citation Flow (Majestic)	43	0
Referring domains (Majestic)	8387	0

3 details filled in for both companies.

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