I'm a solo dev + F&O trader. I built the analytics terminal I always wished existed — sharing what I learned (and the tool itself)
I trade Nifty/BankNifty options actively, and for years my setup was a mess of Excel sheets, broker windows, and random OI websites that update once every 3 minutes.
So over the last few months I built MarketGrok (marketgrok.com) — a Bloomberg-style terminal for NSE F&O, as a solo developer. No team, no funding. Just me, a laptop, and way too much chai.
What's inside:
War Room — one screen with Composite Score, PCR, Max Pain, OI Buildup, sentiment meter, option chain, live news feed, top movers, and 34 global indices. This part is completely free.
Live NSE data for 200+ F&O stocks — no dummy/delayed data anywhere. That was rule #1 while building.
Greeks computed server-side using Black-Scholes, because broker APIs don't actually give you Greeks. Had to build that math myself.
OI Pulse, IV Studio, PCR Radar, Greeks Desk — the deeper Pro tools.
Charts built from scratch — CPR (matches Zerodha's calculation exactly), Ichimoku with forward projection, 13 drawing tools, works on mobile touch.
Breakout scanner that beeps when a stock hits a 500-day high. Simple, but it's caught moves I would've missed.
Some honest lessons from building this:
Payment gateways in India hate anything trading-related. Razorpay rejected me outright for the category. Took three attempts before getting approved.
A race condition in my signup flow silently created duplicate users for ~25% of registrations. Found it only after going live. Always use atomic upserts, folks.
Timezone bugs will humble you. IST + JavaScript's toLocaleString = pain.
The War Room is free to use, and Pro tools have a 7-day free trial (no card needed) if you want to poke around.
Not here to hard-sell — genuinely want feedback from people who actually trade F&O. What's missing? What would make this a daily-use tool for you?
Disclaimer: This is an analytics tool, not investment advice. I'm not a SEBI-registered advisor. Trade at your own risk.
u/Left_Nerve_996 — 1 day ago
Scanned all 208 F&O stocks right now — here's what the OI data is saying today
Ran a full F&O universe scan using OI Buildup + PCR + Momentum + IV
data. Here's what's showing up across 208 stocks as of now:
[POST THE SCORE BOARD SCREENSHOT HERE]
**The numbers:**
- 2 Strongest | 51 Strong | 20 Neutral | 42 Weaker | 24 Weakest
- 53 stocks showing bullish signals vs 66 showing bearish
- Market is slightly bearish skewed at the stock level even though
Nifty is up 0.40% today
**Top Bullish setups (Long Buildup + Strong score):**
- BHARATFORGE — Strongest, PCR 0.84, Long Buildup ✅
- COCHINSHIP — Strongest, Long Buildup ✅
- ADANGREEN — Strong, PCR 0.80, Long Buildup ✅
- BAJFINANCE — Strong, PCR 0.87, Long Buildup ✅
- ASIANPAINT — Strong, PCR 0.81, Long Buildup ✅
**Top Bearish setups (Short Buildup + Weaker score):**
- CUMMINSIND — Weaker, Short Buildup, down 1.13% ⚠️
- COLPAL — Weaker, Short Buildup, down 1.12% ⚠️
- BHARTIARTL — Weaker, Short Buildup ⚠️
- BANKINDIA — Weaker, Short Buildup ⚠️
**What this scoring model uses:**
Each stock gets scored on 4 factors:
OI direction (Long buildup / Short buildup / unwinding)
PCR (Put-Call Ratio — above 0.8 = bullish sentiment)
Price momentum vs VWAP
IV direction (rising or falling)
Combined into a Composite Score → ranked Strongest to Weakest.
This refreshes every 60 seconds automatically.
Built this into MarketGrok (free) — marketgrok.com
Takes about 10 seconds to load the full scan every morning.
What stocks are you watching today?
u/Left_Nerve_996 — 2 days ago
MarketGrok.com the one stop solution for options data analysis.
u/Left_Nerve_996 — 5 days ago
**I built a Bloomberg-style F&O analytics terminal for Indian traders — here's what I learned**
I've been trading NSE F&O for years and was frustrated with the tools available. Zerodha's Kite is great for execution but terrible for pre-trade analysis. Paid Bloomberg terminals are ₹2L+/year. Everything in between felt half-baked.
So I spent the last several months building MarketGrok — a web-based analytics platform specifically for Indian options traders.
What it covers:
- **War Room** — live Composite Score, PCR, Max Pain, OI Buildup, Sentiment Meter across all F&O stocks
- **Option Chain** — live OI, LTP, Greeks (Delta/Gamma/Theta/Vega computed natively via Black-Scholes), IV surface
- **Chart** — CPR (Zerodha-accurate), Ichimoku, HMA, 11 indicators, all drawing tools, live candle updates
- **F&O Master Sheet** — 209 stocks with live scores, RS Rank, VWAP, Volume Alerts
- **OI Pulse, IV Studio, PCR Radar, Score Board, Greeks Desk** — deeper analytics for active options traders
Stack if anyone's curious: React + D3.js frontend, Express.js backend, Fyers API v3 for market data, MongoDB, deployed on Railway + Vercel.
The free tier covers most features. Still early, would love brutal feedback from fellow F&O traders.
Site: marketgrok.com
What analytics do you wish existed that no Indian platform currently offers?
u/Left_Nerve_996 — 5 days ago