Free
₹0
forever
- Foundation simulations — client-server to LSM trees
- Two full interview rooms: URL shortener & rate limiter
- The learning path & glossary
- 10 review cards a day
- Advanced simulations (distributed systems & beyond)
- The other 10 interview rooms
no card required
ONE FULL PREP CYCLE
Quarterly
₹999 · ₹333/mo
every 3 months · cancel anytime
- Everything on the site, unlocked
- All 12 interview rooms, every scenario
- All 57 simulations, including distributed systems
- Unlimited review cards
- Covers a full interview-prep cycle
Payments launching soon
UPI · UPI Autopay · cards
Monthly
₹399
per month · cancel anytime
- Everything on the site, unlocked
- All 12 interview rooms, every scenario
- All 57 simulations, including distributed systems
- Unlimited review cards
- Good for a final-week sprint
Payments launching soon
UPI · UPI Autopay · cards
Prices in INR, inclusive of taxes. Cancel in one click — access runs to the end of the period.
What’s free, what’s paid
| On the site | Free | Paid |
|---|---|---|
| Foundation simulations (bytes → storage engines) | ✓ | ✓ |
| URL shortener & rate limiter interview rooms | ✓ | ✓ |
| Learning path & glossary | ✓ | ✓ |
| Review cards | 10 / day | unlimited |
| Advanced simulations — consistent hashing, Raft, quorums, gossip… | — | ✓ |
| The other 10 interview rooms — chat, news feed, ride-share, video… | — | ✓ |
| Every scenario & epoch in every room | — | ✓ |
Questions
Can I pay with UPI?
Yes — UPI and UPI Autopay for subscriptions, plus all major cards. Powered by Razorpay.
What’s the difference between monthly and quarterly?
Nothing but the length. Both unlock the entire site. Quarterly covers a typical interview-prep cycle and works out to ₹333 a month.
Can I cancel?
Anytime, in one click. You keep access until the end of what you’ve paid for.
Refunds?
If the first week doesn’t work out, write to us within 7 days and we’ll refund it — no questions asked. See the refund policy.