AI Content
Detection Engine
Detect AI-generated content, check plagiarism, fix grammar — all in one place. The #1 AI detection platform for students, writers, and businesses.
Trusted by students & writers across India
AI Content Detection
ChatGPT, Claude, Gemini — Detect any AI content. 95%+ accuracy with Perplexity + Burstiness analysis.
Grammar & Rewriting
Fix grammar, change tone, paraphrase — all in one click. English supported.
Plagiarism Detection
Document fingerprinting, self-similarity detection, and content originality analysis. Get detailed reports.
How It Works?
Get results in 3 simple steps
Paste Your Text
Paste your text or upload a file. Minimum 20 words required.
Choose Analysis
AI Detection, Grammar Check, or Plagiarism — select what you need.
View Report
Get a detailed report with scores, flagged passages, and suggestions.
Why CheckFirst?
What makes us different from the rest
70-80% Cheaper
Premium quality at a fraction of the cost. Student plan starts at just ₹249/month.
All-in-One Platform
AI detection, plagiarism check, grammar fix, and humanize — no need for multiple tools.
No Sign-Up Required
Try 1 free check without creating an account. Sign up for 3 free checks daily.
Made for India
Affordable pricing in INR, UPI/Razorpay payments, built for Indian students and writers.
What Users Say
Real feedback from real users
"Finally an affordable plagiarism checker that actually works! I used to spend so much on other tools. CheckFirst saved me money and time."
Rahul S.
B.Tech Student
"The AI detection is super accurate. I use it to check all my articles before submitting. The humanize feature is a game changer!"
Priya M.
Content Writer
"Great tool for the price. The plagiarism removal feature helped me clean up my research paper. Would love to see more language support."
Amit K.
PhD Scholar
Frequently Asked Questions
Quick answers to common questions
Is CheckFirst free to use?
Yes! You get 1 free check without signing up. Create a free account to get 3 checks per day. Upgrade to Student or Pro plan for more.
How accurate is the AI detection?
Our AI detection uses Perplexity and Burstiness analysis to achieve 95%+ accuracy in detecting content from ChatGPT, Claude, Gemini and other AI tools.
What is the Humanize feature?
Humanize rewrites AI-generated text to make it sound more natural and human-written, while preserving the original meaning. Great for making your content undetectable.
Which file formats are supported?
You can upload .txt, .docx, and .pdf files. Or simply paste your text directly into the editor.
How is CheckFirst different from other tools?
We offer AI detection + plagiarism check + humanize + grammar fix all in one platform at 70-80% lower cost. Built specifically for Indian students with INR pricing and UPI payments.
Ready to Check Your Content?
Start with a free check — no sign-up required. See why students and writers across India trust CheckFirst.