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fastwrite vs Undetectable AI

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

fastwrite compared with Undetectable AI
Detailfastwrite logo fastwriteUndetectable AI logo Undetectable AI
What it doesAI writing assistant for academic papers integrated into Microsoft Word Detect AI, humanize your writing, and enhance your creative work
StageNot given Not given
FoundedNot given 2023
Based inDE US
Pricing modelFreemium Freemium
PricingNot given Free tier with limited features. Paid plans: $5/month (yearly at $60), $9.50/month (yearly at $114), $15.75/month (yearly at $189), $21.25/month (50,000 words/month). Monthly options: $9.99, $19.00, $31.00, $42.50. Business plans available with custom pricing.
Key features
  • Search over 20 million scientific papers using natural language queries
  • Upload and chat with PDFs up to 1,000 pages per document
  • AI-powered sentence and paragraph completion in Word with source citations
  • Deep Review evaluation against nine university grading criteria
  • Automatic APA 7 citation formatting
  • Cross-document PDF search within entire project library
  • Connector integration with Claude and ChatGPT
  • Own-sources-only mode restricting generation to personal documents
  • Available on macOS, Windows, and Web App
  • Multi-model AI text detection across multiple detectors
  • AI humanizer that rewrites text to sound naturally human
  • Chrome Extension for detection and humanization anywhere online
  • Support for 50+ languages including English, Spanish, French, German, Chinese, Japanese
  • Money-back guarantee if output flagged as AI
  • API access with personal use and redistribution plans
What makes it different
  • Integrated directly into Microsoft Word workflow without switching applications
  • Prevents plagiarism by automatically inserting citations and suggesting paraphrasing
  • Specifically optimized for academic writing using custom language models
  • Evaluates work against actual university grading criteria with specific improvement suggestions
  • All work remains private and never used for model training
  • Proprietary humanizer fine-tuned on specific consenting human writers for hyper-specialized rewriting
  • Rated #1 Best AI Detector by Forbes
  • Outputs verified to pass all major AI detectors
Community votes00
DR (Domain Rating by Ahrefs)15 +1 (up) since last check79 no change since last check
Trust Flow (Majestic)1718
Citation Flow (Majestic)2747
Referring domains (Majestic)1534196

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