Built by aspirants,
for aspirants
PrepOS is a modern, free, and intelligent UPSC preparation platform designed to help you crack one of India's toughest exams — without burning a hole in your pocket.
Democratize UPSC preparation
so every aspirant has a fair shot
Traditional UPSC coaching costs ₹1.5–3 lakh per year. Quality study material is locked behind paywalls. Notes are scattered across WhatsApp groups and Telegram channels. We believe knowledge shouldn't be a privilege — it should be a right.
PrepOS brings everything together: PYQ practice, Mains library, a personal planner, sticky notes, syllabus tracking, secure storage, community-shared resources, and smart analytics — all in one place, 100% free.
Everything for Prelims
Master MCQ-based questions with smart practice, analytics & spaced repetition
Daily Practice
Solve curated MCQs daily with smart subject mixing. Adaptive difficulty based on your performance.
Question Library
Browse years of UPSC PYQs with filters by year, subject, topic, paper (GS1, CSAT), and difficulty.
Practice Sets
Create custom collections of questions. Practice specific topics or weak areas anytime.
Smart Revision System
Sunday spaced-repetition system automatically revives wrong answers. Never forget what you've learned.
Repeated Themes
AI analyzes patterns in PYQs to show you which topics repeat across years. Focus on what matters.
Trend Heatmaps
Visualize subject-wise question distribution across years. See which subjects deserve more attention.
Smart Revision System
that actually works
Most aspirants attempt 10,000+ MCQs but forget 70% of them. Our Sunday-based spaced repetition system uses proven memory science to make sure you never forget what you've learned.
Wrong questions auto-saved for revision
Reappears every Sunday until you master it
Tracks 'Mastered' vs 'Still Learning' status
Smart notifications: 'You have 15 questions due for revision'
📅 Sunday Revision Day
15 questions due
Complete Mains Library
Browse, practice, and track all UPSC Mains questions
All Papers Covered
GS1, GS2, GS3, GS4, Essay, and Optional papers. Filter by year, marks, word limit, and topic.
Mains Dashboard
See paper-wise, subject-wise, topic-wise progress. Know exactly how much you've covered.
Done / Not Done Tracking
Simple completion tracking for Mains. No revision pressure — focus on answer writing.
Plan deeply. Capture quickly.
The everyday tools that turn intentions into habits — and habits into results.
Personal Planner
Plan your week with tasks, recurring habits, and topic-wise scheduling. Never miss a day of preparation again.
Sticky Notes
Quick capture for insights, formulas, mnemonics & must-remember facts. Pin them, color-code them, find them instantly.
Syllabus Tracker
The official UPSC syllabus side-by-side with your progress. Mark topics covered, bookmark must-revisit areas, never lose direction.
Your study material, organized
Personal vault, community sharing, and smart organization
Personal Vault
Secure cloud storage for notes, PDFs, images. Nested folders, drag-drop, and auto-compression.
Community Library
Browse notes shared by other aspirants, organized by subject and topic. Bookmark favorites.
Secure PDF Viewer
View PDFs with watermark, no download, no print. Protect intellectual property of shared content.
Smart insights, better decisions
Data-driven analytics to guide your preparation
Weak Area Intelligence
AI identifies your weakest subjects, topics, and mistake patterns. Focus your time wisely.
Leaderboard
See how you rank against other aspirants. Healthy competition keeps you motivated.
Global Search (Cmd+K)
Search across questions, notes, folders — everything in one place with one keyboard shortcut.
What we stand for
100% Free, Forever
Core features will always be free. No hidden charges, no premium walls for serious students.
Privacy First
Your data belongs to you. We don't sell your information. Period.
Built for Speed
Lightning-fast UI, instant search, offline-ready. Time is your most precious resource.
Community Driven
Every feature is shaped by real aspirant feedback. Your voice matters.
Free Forever
100%
Core features
Modules
12+
Built into one ecosystem
Storage Free
100MB
Per user, always
Hidden Costs
₹0
No paywalls. Ever.
Your UPSC journey starts now
Join thousands of aspirants already preparing smarter with PrepOS.
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