Try it blind

Play one round first.

Symbol and dates are hidden. Step forward one candle at a time with Space or the button, trade whenever you like, then hit Reveal to see what it was, what came next, and which stamps this round earned. Synthetic data, demo only.

Key	Action
SPACE	Advance one candle
B	Buy, full size
S	Sell, full size

BLIND

1D 60/100

Press Space or “Next” to advance · synthetic data, demo only

TF1D IndicatorMA 5 / 20 Speed1x

Equity+0.00%

Position —

Reveal

This round

Symbol— Range— Return— Trades—

This was synthetic. The website carries no real market data. In the app, this is where the real symbol and year appear, plus a review of your last few dozen rounds.

Markets can't be predicted. The people who read them can be trained.

Hide the name, hide the date, hide the ending. What's left is the chart and your call.

No forecasts, no tips, no signals. We train judgment, and we keep the record.

Why double-blind

Replay is not training.

Other replay tools open by telling you it's EURUSD, March 2019. Recognise the stretch and you already know roughly how it ends — that isn't practice, that's watching a recording. Double-blind hides both: where the chart came from, and how it turns out.

	Plain replay	Double-blind training	Difference
Origin hidden	Symbol, year and real prices in plain sight	All stripped out; only the shape is left	Recognise the chart and the session is spent
Ending hidden	You know the ticker and the year; the ending is one search away	One bar at a time, the right side is dark	Every decision is made the way a live one is
Revealed at the close	You watch it through; nothing was right or wrong	Only at the end: symbol, year, what happened next	The lesson only lands after the reveal

A wax-sealed envelope on a dark surface, the wax pressing down the flap

Post-session diagnosis

After the reveal, an AI coach reviews the session trade by trade.

When a session ends, the system first stamps it against fixed standards: chased the top, sold too early, held through. Every stamp can be recomputed; none of it is a feeling. Then the AI coach reads your trades, the reasons you wrote down, and those stamps, and explains in plain words which step was right, where you went wrong, and what to watch next session. It explains; it never forecasts and never changes a stamp.

A square stamp pressed on a paper trading card bearing a candlestick chart

Bought the top

Bought at the top of a big green candle, right before it turned

FOMO'd in

Couldn't resist entering only after several candles of gains

Caught a falling knife

Entered mid-decline and it fell further

Sold too early

Sold, and the move continued without you

Round-tripped

Sat on a nice open profit, didn't hold it, ended flat or worse

YOLO'd in

Went all-in on the very first entry

Diamond hands

Held to the end of the move and kept the bulk of it

Clean stop

Left at the stop you had set, no bag-holding

Dodged it

Stayed on the sidelines through a steep drop

One ruler for every market. A small coin and a major index are measured the same.

Classic battles

Would you have survived that year?

Every historical market run is a sealed sample.

Famous market events as levels. Blind by default — you don't know which one you drew until it's over.

A transparent resin block sealing a candlestick sample with its buy and sell marks, on a dark surface

Year	Name	Class	TF	Status
2008–09	Global Financial Crisis	US stocks	1D	BLIND
2015	China A-share crash	China A-share	1D	BLIND
2020	COVID crash	US stocks	1D	BLIND
2021	GameStop squeeze	US stocks	1D	BLIND
2022-05	LUNA collapse	Crypto	1D	BLIND
2022-11	FTX collapse	Crypto	1D	BLIND

Discipline

Turn discipline into a habit.

Trading discipline comes down to one sentence: stay out when there is no setup, and follow the plan when there is one. Four mechanisms train it into your hands, and every one of them credits process, never profit.

Mechanism	What it trains
Streaks count days	One session or ten, the day counts once. It trains the habit of showing up and judging every day, not trading to hit a number.
Tasks credit the process	"Stop set this session" and "size within plan" complete a task; profit and loss do not count. It trains execution to plan, not chasing outcomes.
Achievements need a run	One good stop is nothing; ten sessions in a row unlock it. It trains consistency, not a lucky one-off.
Grey until the sample is there	Win rate and payoff ratio stay grey under 20 sessions. It trains the long view instead of a week's luck.

A wooden metronome on a dark desk, a sliding weight on its pendulum rod

Data

Your market data stays with you.

A dark safe standing upright, a combination dial mounted on its door

The data you practise on lives only on your own device: we never see it, never keep it, never ship it with the app. Import your own data or fetch public markets in one tap, and practise any time.

Nonzero Lab Research

Research

Reviews of the public evidence on trading judgment, technical indicator effectiveness, and sample statistics.

2026-09-14Catching a Falling Knife: How Often Do Losers Come Back? 2026-09-07Bar Replay Tools Compared: TradingView, KTrainer, ColdRead 2026-09-07Leeks, Ants and Locusts: Trading Slang Around the World

All articles

A field of graphite noise bars with a single amber signal bar rising far above them

Pricing

Local forever. Cloud by the year.

A golden key lying diagonally on a dark card, its teeth pointing to the lower right

A one-time purchase we can honour: the local features cost us nothing to run, so they really are permanent. What keeps costing (sync, AI review) is yearly — when it lapses, only the cloud switches off.

See full pricing

FAQ

Frequently asked

Q01Does my practice data get uploaded?

No. Market data stays on your device: crypto and FX are fetched to your device in one tap, stocks import locally from your own software. The cloud syncs training records only.

Q02What does the free tier include?

15 rounds a day, no sign-in; basic indicators and post-round diagnosis. The one-time purchase lifts the cap and keeps local features and sync yours for good.

Q03Which classes and platforms?

Stocks, crypto, FX, US, HK, futures. Web today; iOS and Android will share the same account and record when they ship.

Q04What happens when the AI credits lapse?

Nothing else changes. Only AI review pauses — local features and cross-device sync come with the one-time purchase and stay forever.

Q05I'm a beginner — is this for me?

Yes. Stepping bar by bar is just ordinary chart-watching, and the labels are plain language. Start on the free tier, no sign-up.

Q06How is this different from scrolling old charts myself?

When you scroll, you usually know the symbol and the year — the answer is in front of you. We cover the answer, force you to face the unknown like a live trade, and compare notes at the reveal.