You describe the strategy. Jo writes the code — you own it.
You trade hunches. Make us prove it first.
Tell Jo the setup in plain English. The tearsheet here is a real backtest, not a mockup: one sentence in, 74 trades out, worst month included. Then the gauntlet:
- ▸Fills at the next bar's open — no trading on a close it hasn't seen.
- ▸Overfit settings get flagged; survivors rank by out-of-sample score.
- ▸Paper trades on live market bars, positions and P&L in real time.
- ▸One run can backtest the idea across all 50 Nifty names (Pro).
Free: 300K AI tokens a week · 3 active projects · no card. First backtest tonight; the optimizer and paper desk are Pro.
"Go long the NIFTY 50 when the 20-hour SMA crosses above the 50. Flip short when it crosses back down."
The whole loop lives in one chat.
Idea to live paper trade without leaving the project. No notebook, no spreadsheet, no copy-pasting between five tools.
Describe it
Plain English. Entry, exit, universe. Jo asks when something is ambiguous.
Jo writes the code you asked for
Real, auditable code that is yours — open it, edit it, or ignore it. You own every version.
Backtest honestly
Next-bar-open fills, transaction costs included, intrabar stops. The trade log exports to CSV.
Stress-test the parameters
Grid search on a train/test split, scored by lower confidence bound. Overfit settings get flagged; the ones that survive out-of-sample rank to the top.
Paper trade live
Real market bars, simulated money. Positions and P&L tick live; the run keeps going unattended, paper only.
Backtests that are allowed to say no.
Most backtesting flatters the strategy. QuantJo is built to disappoint you on paper, before the market does it with your money.
▸Next-bar-open fills
A signal on bar N fills at bar N+1's open. Your backtest can't trade on a close it hasn't seen yet — the most common way a backtest flatters itself.
▸Stops fill where they'd actually fill
Platform exit rules (stop loss, take profit) execute intrabar against the high and low, on the touch. A gap through your stop fills at the open, not at your price. No end-of-bar mercy.
▸Validation that can kill the idea
Parameter search trains on one window and is judged on the next, scored by lower confidence bound. Overfit ideas get flagged with the reason, and the ones that don't survive out-of-sample sink to the bottom.
▸Research beyond the strategy
Explore your data directly: rank the Nifty 50 by a signal, chart a pair spread, keep every analysis alongside the strategy.
Better to find that out from a backtest than from the market. Put a hunch through it, free →
Your data, connected once.
Connect a provider you already subscribe to. QuantJo works with the data your own subscription entitles you to — backtests, research, paper trading — and never resells or redistributes exchange data.
| Provider | Markets | Bars | Auth |
|---|---|---|---|
| ZerodhaIndia | NSE & BSE equities, futures, options | Daily + intraday, 1m to 240m | OAuth |
| FyersIndia | NSE & BSE equities, futures, options | Daily + intraday | OAuth |
| TrueDataIndia | NSE, BSE & MCX equities, futures, options | Daily + intraday, tick | API key |
| DatabentoGlobal | CME, NYSE, NASDAQ, crypto | Tick data, any interval reconstructed | API key |
What QuantJo is not.
Every trading tool oversells. Here is our own risk disclosure.
- Not financial advice. Jo writes and tests the code you ask for. It does not tell you what to buy, and QuantJo does not provide, curate, rank, or recommend strategies. You bring the edge; QuantJo makes it testable.
- Not a broker. QuantJo never holds your funds. You connect your own data accounts, and you operate on the market data your own subscription entitles you to.
- Paper trading, not real orders. Strategies trade simulated capital against live market bars. QuantJo places no real orders with any broker.
Shipping next.
Built in the open, with real ship dates and status.
Bucket runs
One strategy, every name in the bucket. Sweep the whole Nifty 50 in a single run. Pro.
1-second CME data
Native 1-second bars on CME futures via Databento, historic and live. Pro.
Options strategies
NSE options data is already connected. Strategy support lands in the SDK next.
Fundamentals & global markets
Screen on earnings and balance-sheet data alongside price. More exchanges beyond NSE, BSE, and US venues.
Pricing.
Start free. Pro is ₹3,250 a month at launch, half its list price.
Describe an idea, get the code, backtest it against real data.
- 300K AI tokens / week
- 3 active projects
- Backtesting + research included
The full loop: optimization, live paper trading, bucket sweeps.
- 2.5M AI tokens / week
- 5 live paper strategies
- Optimizer · bucket runs · 1-second data
Subscribe at launch and keep this price for as long as you stay subscribed.
Common questions.
What the product does and doesn't do, in plain terms.
Can I backtest a trading strategy without writing code?
Yes. You describe the strategy in plain English and Jo writes the code. You can read and edit the file if you want to; you never have to.
Does QuantJo work with Indian markets?
Yes. NSE and BSE data come through Zerodha, Fyers, or TrueData, intraday and daily. US and global markets come through Databento.
What does QuantJo cost?
The Free plan costs nothing and needs no card: 300K AI tokens a week, 3 active projects, backtesting and research included. Pro is ₹3,250 a month at launch, half the ₹6,500 list price, and subscribers who join at launch keep that rate for as long as they stay subscribed. The optimizer, paper trading, bucket runs, and 1-second data are Pro.
How does QuantJo handle lookahead bias?
Signals generated on one bar fill at the next bar's open, so a backtest can never trade on a close it hasn't seen. Stops and targets execute intrabar against the high and low, and a gap through your stop fills at the open.
Does QuantJo place real trades?
No. QuantJo paper trades: live market data, simulated money. It does not connect to a brokerage and it cannot place a real order.
You've been sitting on that idea for months.
It's either an edge or it isn't. Under a minute to a project, your first backtest tonight.
Free plan: 300K AI tokens a week · 3 active projects · no card.