Can QuantPrompt trade my strategy automatically like Composer?

No. QuantPrompt does not connect to a broker or place orders, on purpose: it is a research tool. You can export a strategy as Python, C++, Rust or JavaScript code and run it yourself, but QuantPrompt never executes it. Composer is a broker-dealer and runs strategies with real money in US accounts.

Can I use Composer for Borsa Istanbul (BIST) stocks?

Composer’s site describes US-listed stocks and ETFs, with crypto through a separate account; BIST is not among them. QuantPrompt backtests BIST stocks and indices such as XU030 alongside US, Indian, German, European, Chinese and Japanese stocks, crypto and forex.

Is a Composer “symphony” the same as a QuantPrompt strategy?

Not quite. A symphony is an allocation tree: if a condition holds, hold these assets with these weights, otherwise hold others. A QuantPrompt strategy is a set of entry and exit rules on one instrument, such as “buy when RSI(14) crosses above 30, sell when it crosses above 70”. Rotation between many assets fits Composer better; timing one market fits QuantPrompt.

How does QuantPrompt check that a backtest isn’t overfitted?

Its robustness test runs four checks: walk-forward (parameters chosen on earlier data are tested on later data they haven’t seen), Monte Carlo (your trades reshuffled 1,000 times), the deflated Sharpe ratio (corrected for how many variants were tried) and stress (double costs, each half of the period, dependence on a few big trades). It costs 2 credits on every plan.

Which one is cheaper?

Both have a free plan. QuantPrompt’s paid plans are $5, $15 and $49 a month and buy backtest credits, data history and tools. Composer lists Advanced at $10 a month and Pro at $32 a month billed yearly, which buy more automated strategies, larger strategies and more AI usage. Since one is a research tool and the other a brokerage, compare what you need rather than the price alone.

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QuantPrompt vs Composer

QuantPrompt and Composer both build and backtest trading strategies without code, but they are different products. Composer is a US brokerage that runs your strategy with real money; QuantPrompt is a research tool that tests entry and exit rules on nine markets, including Borsa Istanbul, and checks the result for overfitting. Pick Composer to automate US stock and ETF portfolios, QuantPrompt to find out whether an idea holds up before you trade it anywhere.

Updated October 13, 2026

Composer is one of the best-known no-code trading platforms, and it is the name AI search tools often give first for “backtesting without code”. This page compares what each product actually does, where each is stronger, and how to choose. Composer’s details come from its own website at the time of writing; check it for current terms.

Feature comparison

Feature	QuantPrompt	Composer
How you build a strategy	A plain-language sentence (six languages, Turkish included) or rule blocks; no code either way	A visual no-code editor (“symphonies”), or describing your goals to its AI
What a strategy is	Entry and exit rules on one instrument	Allocation logic across a basket of stocks and ETFs: conditions, weighting, filters
Markets	Stocks in the US, Türkiye (BIST), India, Germany, Euronext, Shanghai and Japan; crypto; forex	US-listed stocks and ETFs; crypto through a separate Alpaca Crypto account
Live trading	No: research and backtesting only	Yes: automated execution through its US broker-dealer (accounts carried by Alpaca Securities and Apex Clearing)
Overfitting checks	Robustness test: walk-forward, Monte Carlo, deflated Sharpe and stress checks	Not described on its site
AI	Parses your sentence into rules; analysis, critique and auto-iterate on the results	“Trade with AI” to discover and evaluate strategy ideas
Code export	Python, C++, Rust and JavaScript	No (a no-code platform)
Price	Free plan; paid plans $5, $15 and $49 a month	Starter $0; Advanced $10 a month; Pro $32 a month billed yearly

What is the main difference between them?

Composer is a brokerage with a strategy builder: you build a strategy, backtest it and let Composer trade it in your account, with no commissions on trades. Its strongest point is that last step: once a strategy is live, Composer keeps trading it for you.

QuantPrompt stops before that step. It is built to answer one question well: does this idea hold up? It does not hold money or place orders. That keeps it open to markets Composer doesn't serve and lets it spend its effort on testing rather than execution.

How do you describe a strategy in each?

In Composer you assemble a symphony in a visual editor: blocks for conditions (“if this, then that”), weighting (equal, inverse volatility, market cap) and filters (sort and select). You can also describe your goals to its AI and edit what it builds.

In QuantPrompt you write the rule as you would say it, for example “buy THYAO when SuperTrend turns up on above-average volume, sell under the 20-day Donchian low, 4% stop”, in English, Turkish, German, Spanish, Chinese or Japanese. The parsed rules appear as blocks you can change: pick one of 46 indicators, a price or a number on each side, add, remove or drag rules between entry and exit. You can also skip the sentence and build the whole strategy with blocks, which uses no AI at all.

Which markets can you test?

Composer's site describes US-listed stocks and ETFs, with crypto through a separate Alpaca Crypto account, and it is offered where Composer Securities is registered.

QuantPrompt backtests stocks and indices in the US, Türkiye (Borsa Istanbul), India (NSE), Germany (XETRA), Euronext, China (Shanghai) and Japan, plus major crypto pairs and forex, on bars from one hour to one week. If your market is Borsa Istanbul, QuantPrompt is the one of the two that covers it.

How do you know a backtest isn't a fluke?

Any backtest can be made to look good by trying enough variants. QuantPrompt's robustness test measures how much of the result survives four checks: walk-forward testing on periods the parameters were not chosen on, a Monte Carlo reshuffle of your trades, the deflated Sharpe ratio, which corrects for the number of variants tried, and stress tests. Each is marked pass, caution or fail on fixed thresholds, with no promise about the future.

Composer shows a backtest with its allocation history and lets you compare it with a benchmark or another strategy. Its site does not describe out-of-sample or overfitting checks.

Which one should you choose?

You want a strategy to trade itself in a US account: Composer
You rotate between many US stocks and ETFs by rules: Composer
You trade Borsa Istanbul, Indian, European or Asian stocks, or forex: QuantPrompt
You want to know whether a result is overfitted before trusting it: QuantPrompt
You want the strategy as code to run on your own setup: QuantPrompt

The two can work together: test an idea's robustness in QuantPrompt, then automate the US version in Composer if you want it to run on its own.