If this is you
Choose FX Replay
You trade by hand and want to replay below one minute. You like the idea of AI feedback on your behavior, Monte Carlo and a prop firm simulator in one browser tab.
FX Replay vs Forex Tester
FX Replay vs Forex Tester Online: which to backtest with
FX Replay and Forex Tester Online both run in the browser and simulate prop firm challenges. Forex Tester goes wide on data and method: tick data, up to 10 synced charts, robots, a blind mode. FX Replay centers on manual practice: seconds charts, Mentor AI, Monte Carlo. BacktestFlow goes deep on forex execution: every trade recorded, findings checked for significance.
1row FX Replay leads
4rows Forex Tester leads
4rows BacktestFlow leads both
The difference that decides it
Two browser backtesters, two different bets.
A few years ago this comparison came down to installation: FX Replay ran in the browser and Forex Tester was desktop software. That is no longer true. Forex Tester Online runs in any browser, on desktop and mobile, so the question is what each tool is built to test.
FX Replay describes itself as built for manual traders who want to practice execution rather than run automated scripts. Everything points that way: seconds replay, a journal with on chart review, Mentor AI feedback on your behavior, Monte Carlo and a prop firm simulator.
Forex Tester Online is built around data fidelity and testing method. Its candles are formed from tick data, with spreads, swaps and commissions simulated. It backtests trading robots as well as manual trades, and even portfolios that combine both. It can hide the instrument and dates so you test without bias. Its smallest chart timeframe, though, is one minute.
So the table leans toward Forex Tester Online on data and method, and toward FX Replay below one minute. Where neither leads, it comes down to how you work. Both have a free way in, so you can test the same strategy on each and compare.
Side by side
Feature by feature. Where one tool leads, its cell is marked: 1 row for FX Replay, 4 for Forex Tester, 4 for BacktestFlow. BacktestFlow is the last column, for reference.
| Feature | FX Replay | Forex Tester | BacktestFlow |
|---|---|---|---|
| Trade record | Built in journal, with on chart trade review | Trades and notes are kept in the backtest project | LeadsEvery close opens a write up with notes, tags, checklist and screenshots, and the replay waits until it is saved |
| Findings and coaching | Mentor AI: “AI-powered feedback on your trading behavior to identify patterns” | Data driven recommendations, a Trade Analyzer, and analysis of which sessions and market conditions work best | LeadsFlow Coach runs 28 analyses. A finding is kept only if it passes a significance check, and a report may only quote numbers the engine measured. On the Max plan every report, on the others the first per strategy and lens |
| Execution metrics | Time based analytics: which sessions and hours your results cluster in | Tracks whether your higher confidence trades actually perform better | LeadsPlanned against captured R:R, target hit rate and position sizing consistency on every plan; the checklist discipline score on paid plans |
| Forex specific analysis | Time based analytics, across many markets | Session analysis, across forex, stocks, futures and ETFs | LeadsStatistics in pips, candles on the DST aware 17:00 New York session grid, and on paid plans, performance by trading session |
| Markets | Futures, forex, stocks, indices and crypto; its FAQ also names metals, energy and agricultural markets | 283 assets: 112 currency pairs plus commodities, indices, stocks, futures, ETFs and crypto | 41 instruments on paid plans, forex first: 28 pairs plus metals, energy, the dollar index, four stock indices, BTC and ETH. The free plan has 8 of them |
| Forex history | Declared per pair and broker feed: May 2002 on USDCHF and EURJPY, January 2005 on EURUSD from OANDA | Up to 23 years depending on the asset: EURUSD, GBPUSD, USDJPY and gold from May 6, 2003 | Forex from 2010 to 2015 depending on pair: GBPUSD and AUDUSD from 2010, EURUSD from 2012. Gold from 2011 |
| Price data | Candles, with seconds level data on many pairs | LeadsTick by tick data that forms each candle, with spreads, swaps and commissions simulated | 1 minute OHLC candles from bid prices; no tick data and no spread modeling |
| Smallest timeframe | LeadsSeconds, with 5 second candles listed on many forex pairs | 1 minute; their FAQ says second based timeframes are planned | 1 minute |
| Several charts at once | Multi pair and multi chart layouts, TradingView powered | Up to 10 synced charts, across different symbols and timeframes | One instrument per session |
| Coded strategies | None: built for manual traders. FXR Script is for indicators | LeadsBacktests trading robots, and portfolios that mix robots with discretionary trading | Manual by design: every trade is placed by hand |
| Jumping through history | Go to sessions, price levels, news events or trade closes, with an economic calendar | LeadsJumps to indicator crossovers, level touches, session opens and news events, with an economic calendar and a blind mode that hides the instrument and dates | Each session starts on a date you pick and moves forward. On the Max plan, rewind steps back 1 to 50 candles |
| Prop firm challenges | Prop Firm Simulator: “simulate prop firm challenges with real rules and conditions” | Prop Firm Simulator: account size, profit target, daily and total drawdown and minimum days, with an optimizer | On paid plans, a challenge mode: profit target, daily and max drawdown on equity, open positions included, and a locked Passed or Failed result |
| Other analysis tools | Monte Carlo and time based analytics | Exit Optimizer for stop, target and holding time | On paid plans: 1,000 seeded equity paths resampled from your own R multiples, with unlucky, median and lucky scenarios |
| Journal | FXR Journal, with a P&L tracker and a performance calendar | Unlimited tags, one click screenshots, checklists and a confidence level per trade; imports history from MetaTrader, TradingView and NinjaTrader | A separate journal for live trades, with its own statistics and reports. Live trades are entered by hand |
| Where it runs | In the browser | LeadsAny browser, desktop or mobile, plus a separate desktop version that works without an internet connection | Nothing to install: runs in the browser, the same on macOS, Windows and Linux |
The short answer
Which should you use?
If this is you
Choose Forex Tester
You want the most faithful data, several synced charts, robots tested next to manual trades, blind testing, or a desktop version that works offline.
If this is you
The forex specialist: BacktestFlow
You trade forex by hand and want to know whether you followed your own process. Every trade is recorded before the replay moves on, and findings must pass a significance check. The statistics measure planned against captured risk to reward on every plan, and score checklist discipline on paid plans.
FAQ
Frequently asked questions. About FX Replay, Forex Tester, and the differences.
For data and testing method, yes. Forex Tester Online forms its candles from tick data, syncs up to 10 charts, and tests trading robots as well as manual trades. It also offers a blind mode. FX Replay is the better fit if you want replay below one minute, Mentor AI or Monte Carlo. Both simulate prop firm challenges, and both run in the browser.
FX Replay is a browser platform built for manual traders practicing execution, across futures, forex, stocks, indices and crypto. Forex Tester Online is a browser platform built around tick data and testing method, for manual and algorithmic strategies, across 283 assets. Forex Tester also has an older desktop version that works offline; FX Replay is browser only.
FX Replay's charts go down to seconds, with 5 second candles listed on many forex pairs. Its FAQ describes that seconds level data as tick precise replay. Forex Tester Online stores tick by tick data and forms its candles from it. Its smallest chart timeframe, though, is one minute, with second based timeframes planned.
Yes. Forex Tester Online runs in any browser on macOS, Windows, Linux, Android and iOS, with nothing to download or install. The separate desktop version is Windows software that works offline. FX Replay is browser based too, so installation no longer separates the two.
Both have a Prop Firm Simulator. Forex Tester Online lists the rules it models: account size, profit target, daily and total drawdown, minimum days. It adds an optimizer to match rules to your edge. FX Replay describes simulating challenges with real rules and conditions. Neither is affiliated with BacktestFlow, and BacktestFlow is not affiliated with any prop firm.
Forex Tester goes wide on data and method, FX Replay across markets and seconds charts. BacktestFlow goes deep on forex execution. The replay waits until every trade is recorded, and Flow Coach keeps a finding only if it passes a significance check. The statistics measure planned against captured R:R and sizing consistency on every plan, and checklist discipline on paid plans.
Sources
Check it yourself. Every claim about FX Replay and Forex Tester on this page was checked against their own published material in October 2026.
- FX Replay, product site (features, asset list, FAQ)
- Forex Tester Online, product site (features, asset list, FAQ)
- Forex Tester Online, prop firm challenge simulator
- Forex Tester Desktop, product site
We quote no prices: they change often, so check them at the source. Software changes too, so if something here is out of date, it is an error rather than a position, and it gets corrected.
BacktestFlow is not affiliated with, endorsed by, or sponsored by FX Replay or Forex Tester. FX Replay and Forex Tester are trademarks of their respective owners. Features change: verify current details at the source.
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