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99tests vs GPTZero

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

99tests compared with GPTZero
Detail 99testsGPTZero logo GPTZero
What it doesReal testers run your AI-generated test cases on real phones and browsers with a human-verified pass/fail report in 3 days AI detector that identifies content generated by large language models
StageEstablished Not given
Founded2011 2023
Based inIN Not given
Pricing modelPaid Freemium
PricingStarter ₹9,999 + GST (5 sessions × 45 min, 2 devices/browsers, up to ~25 test cases, 3 business days); Standard ₹18,999 + GST (10 sessions × 45 min, 4 devices/browsers, up to ~50 test cases, 3 business days); Deep ₹34,999 + GST (20 sessions × 90 min, 6 devices/browsers, up to ~120 test cases, 5 busi 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.
Key features
  • Test case execution on real Android and iOS phones
  • Cross-browser testing on Chrome, Safari, Edge and Firefox
  • Human-verified pass/fail results for every test case
  • Screenshot and video recording of every failure
  • Exact reproduction steps for every failure
  • Device, OS and browser version details in report
  • Verified severity grading against published rubric
  • Duplicate finding merging and verification
  • One-click re-run on same plan with new build
  • Coverage table showing pass/fail/blocked status per device
  • 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
What makes it different
  • Real devices only, not emulators or simulators
  • Human verification catches failures emulators and AI agent test runs miss
  • Fixed price with no hourly overage or hidden charges
  • Unfilled device sessions automatically credited to next job
  • 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
Community votes00
DR (Domain Rating by Ahrefs)27 no change since last check81 no change since last check
Trust Flow (Majestic)927
Citation Flow (Majestic)3243
Referring domains (Majestic)1098387

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