The Best Apps for RSI (Relative Strength Index) in 2026

The best app for the relative strength index depends on which RSI job you need done. TradingView has the deepest free RSI toolbox and the biggest library of RSI variants, thinkorswim lets you program custom RSI logic and scan the market on it for free, Webull puts a clean free RSI on the phone app beginners already trade from, TrendSpider scans and backtests RSI conditions for a subscription, MetaTrader automates RSI alerts and even entries for forex traders, and Finviz screens all of US equities by RSI value without asking for an account. This comparison covers what each one actually does with RSI, what it costs, and the setup detail that decides whether your RSI alerts help you or spam you.

Quick comparison

The three jobs an RSI app can do

RSI apps earn their place doing one of three jobs, and knowing which one you need saves you a subscription.

The first job is plotting it properly. Every charting app draws a 14-period RSI. Fewer let you change the inputs that actually matter: the period, the overbought and oversold lines, and the data source. That last one is the sleeper setting. RSI calculates on closing prices by default, so if you hunt divergence in the wicks, the indicator never saw the prices you are looking at. Our RSI guide covers why switching the source to HLC3 fixes that.

The second job is alerting. You cannot watch a chart all day, so the app pings you when RSI crosses a line. Done naively this is the fastest way to get burned by the indicator, and there is a right way to configure it, covered below.

The third job is screening and testing. Instead of asking "what is RSI on this chart," you ask "which of 8,000 stocks has RSI under 30 today" or "how has buying RSI 30 actually performed on this symbol." Only some of the apps here reach that far, and they are the ones that charge.

None of the three jobs includes telling you whether the reading matters. RSI at 28 on a stock in free fall and RSI at 28 on a pullback to tested support are the same number and completely different trades. Keep that in mind through every section below, because it is the gap every one of these apps leaves open.

TradingView: the deepest RSI toolbox most traders will ever need

TradingView is where a large share of retail traders already chart (its iPhone app alone carries a 4.8 rating across roughly 393,000 reviews), and its RSI coverage runs deeper than anything else at the free price. The built-in RSI is fully adjustable: period, band levels, data source, plus a smoothing moving average and Bollinger Bands drawn directly on the RSI pane if you want them. Alerts attach to the indicator itself, so "RSI(14) crossing down through 70" is a supported condition on any symbol, and the free plan includes enough active alerts to cover a small watchlist. The caps rise with the paid tiers.

The second layer is the script library, and for RSI it is enormous. Community developers publish stochastic RSI variants, divergence painters that mark higher-lows-versus-lower-lows for you, and steadily more ambitious rebuilds; a free "Machine Learning RSI" released this July repackages the indicator as a multi-feature market read. Quality varies script to script. When r/pinescript asked in June which public TradingView indicator is actually worth running, the original poster's answer was an RSI stack: a 2-period RSI with an EMA, Bollinger Bands, and a stochastic RSI, which he said works like a charm. A 2-period RSI is a real, published approach (Larry Connors built a mean-reversion system on exactly that math), so the thread is a useful reminder that the interesting RSI work on TradingView happens in the scripts, and the defaults are only the starting point.

One honest warning from inside the ecosystem: the documentation for one widely used RSI script tells users plainly that on 1-hour charts and below, signal frequency rises and so do false positives, and that the indicator should not run as a standalone system around FOMC, NFP, or CPI releases, where price gaps ignore momentum entirely. That is script authors telling you their own indicator's limits. Believe them.

TradingView's screener rounds it out: RSI is a standard filter, so "S&P 500 stocks with RSI(14) below 30" is a saved screen on the free plan. If you want one app for plotting, alerting, and screening RSI, this is the default answer, the same verdict it earned in our comparison of stock pattern apps.

thinkorswim: RSI you can program

Thinkorswim, Schwab's platform, treats RSI as one more study you can open, tune, and rewrite. The standard study covers the usual inputs, and thinkScript, the platform's built-in language, lets you go past them: RSI of a different price series, RSI smoothed your own way, RSI conditions combined with volume or trend filters into a single plotted signal. The Stock Hacker scanner then runs any of that logic across the market, so "stocks over $10 with RSI crossing up through 30 on the daily" is a scan you build once and reuse. Study alerts fire on the same conditions.

The cost is the learning curve, the same one noted in our other comparisons. Thinkorswim is a professional desktop platform, and the RSI power sits behind menus and a scripting language that expect an evening of commitment. For a trader who wants custom RSI logic without paying for it, this is the deepest option on the page. For someone who wants RSI on a phone chart in the next five minutes, it is the wrong temperament, and the next app is the right one.

Webull: free RSI on the phone you already trade from

Webull ships RSI as part of its free charting: open a chart, add the indicator, adjust the period and levels, done. For the beginner crowd that lives in the app anyway, that is most of what gets used, and it costs nothing. Webull's free technical signals also include a set of indicator-based flags alongside its candlestick markers, so some momentum context gets surfaced without any setup at all.

The limits show up as soon as you want RSI to do more than sit on the chart. Webull is built for reading the indicator on the chart in front of you; TradingView and thinkorswim handle RSI-level alerting and market-wide RSI scanning more directly, and Webull has no backtesting layer to check how an RSI rule has performed. Treat it as the free reading copy of RSI, use its candlestick screener for the pattern half of the job it is genuinely good at, and graduate to one of the other platforms when you catch yourself wanting alerts.

TrendSpider: RSI scans and backtests, for a price

TrendSpider does with RSI what it does with everything: automates the finding and then tests the premise. The scanner runs indicator conditions across whole watchlists or indexes, so "every Nasdaq-100 name with daily RSI under 30 while the weekly RSI holds above 50" collapses to a single query. Multi-timeframe analysis is native, which matters for RSI specifically because the daily and hourly readings disagree constantly and the higher timeframe deserves the vote. And the backtester closes the loop: before you trade "buy RSI 30, sell RSI 50" on a symbol, you can run it against history and see whether that edge ever existed.

Given how much RSI folklore circulates untested, a platform that makes testing the default is taking the indicator more seriously than most of its users do. The catch is unchanged from our other comparisons: TrendSpider has no free tier, it is the most expensive tool here, and it earns its subscription only if the scanning and testing layers become routine. If your RSI use is one chart at a time, the free platforms above cover you.

MetaTrader 4 and 5: automated RSI for the forex crowd

MetaTrader comes up whenever forex traders compare RSI tooling, and for one specific reason: expert advisors. RSI ships as a built-in indicator, and the EA layer can automate anything around it, from a simple alert when RSI crosses a level to a fully coded strategy that enters and exits on RSI rules while you sleep. Broker reviews of RSI platforms keep making the same point: MetaTrader is where RSI stops being something you watch and becomes something that executes.

The fit is narrow but real. MetaTrader is free through most forex brokers, its market coverage follows whatever your broker offers, and the platform shows its age everywhere except the automation. A stock or crypto trader has better options above. A forex trader who wants RSI rules running unattended has exactly one mainstream answer, and this is it. Automating an entry does not make the entry good, though; backtest the rule first, and size it knowing that automated systems fail in fast markets too.

Finviz: RSI screening without an account

Finviz answers one question well: which US stocks are at an RSI extreme right now? The free screener's technical filters include RSI(14) with preset thresholds (oversold under 30 or 40, overbought over 60 or 70), so the full US market collapses to a candidate list in two clicks, no account required. Day traders lean on it for the oversold-bounce hunting grounds; the Elite tier adds real-time data but the filter itself is free.

The scope is the tradeoff. Finviz screens US equities only, charts are basic, and there are no alerts on the free tier, so it works best as the discovery half of a pair: Finviz finds the ten stocks with washed-out RSI, and a proper charting app or a screenshot read tells you which of the ten formed the reading somewhere that matters.

Where Quant AI fits

Quant AI does the job that starts when the RSI apps finish. Every tool above hands you a number or a ping: RSI is 27, RSI crossed 70, here are today's oversold names. The decision still needs the chart read around that number, and that is what Quant AI does. Screenshot the chart from any platform here and it marks the trend, the key levels, and the setup it sees in seconds, with no account or chart setup, the same way it reads chart patterns from a screenshot.

That read is the difference between the two RSI-28 trades from earlier. An oversold print into support that has held three times, in an uptrend, is a setup. The identical print in a falling knife is a donation. The apps above cannot tell those apart because the answer lives in structure, and structure is what a screenshot read returns.

What Quant AI does not do: plot RSI, send alerts, or scan watchlists. It reads the chart you hand it. Pair it with a free alert engine (TradingView) or a free screener (Finviz) and the loop closes: the alert fires, the screenshot gets read, and the decision rests on trend and levels, with the number as the prompt.

Setting RSI alerts that do not cry wolf

The most common RSI alert is also the broken one: ping me when RSI crosses above 70, then sell. In a strong uptrend RSI pins above 70 and stays there while price keeps climbing, so the alert fires at the exact moment the trend is proving itself strongest.

A line chart of a trending stock over twenty sessions with price on the left axis and RSI on the right axis. Price climbs steadily from 100 to 126. RSI crosses above the overbought line at 70 on day 4 and stays pinned between 71 and 84 for twelve consecutive sessions while price rises another 20 percent, before RSI finally crosses back below 70 on day 17 near the top at 125. A naive alert at the first RSI 70 touch on day 4, at a price of 104, would have signaled a sell 21 points before the move ended. The exit-cross alert on day 17 fires near 125. Overbought is marked at 70.

Three configuration changes fix most of the pain, and every alert-capable app on this page supports the first two.

Alert on the exit of the band. Set the condition to "RSI crossing down through 70" instead of "RSI above 70." An overbought market that is still overbought is a trend; the information arrives when momentum finally lets go of the band. Same logic in reverse at 30: the cross back up fires once, and only after the selling has actually stopped.

Alert on the 50 line for bias. RSI holding above 50 on pullbacks means the buyers still have the tape. A cross of 50 fires rarely and marks a genuine momentum shift, which makes it a better phone notification than either band. One well-liked comment under a popular RSI strategy video takes the same idea further: the trader draws a box from 55 to 45 and ignores everything inside it, "to get rid of fake breakout," which he said has worked for him fantastically. The width is personal preference; the principle of demanding a clean escape from the midzone is sound.

Keep the daily in charge. Alerts on 1-hour and shorter RSI fire constantly, and the false-positive warning from the TradingView script docs above applies to every platform. If you run intraday RSI alerts at all, let a daily-timeframe condition gate them, which TrendSpider does natively and thinkorswim does with one more line of script.

What profitable traders say about RSI apps

Here is the thread the app marketing never quotes. In June, r/Trading asked which indicator people stopped using after becoming consistently profitable. The top answer was "All of them." Another regular explained he came up on chart patterns first, added indicators later through a course that taught them "to understand confluence, not to trade off them independently." A third said he keeps something RSI-like on the chart but does not bother with RSI itself anymore, and one more summed up his current system as support and resistance plus market structure, full stop.

That thread is a warning about what an app can and cannot give you, from traders who spent years with RSI on their charts before demoting it. A better RSI app gets you cleaner alerts and tested rules. It does not turn a momentum gauge into a decision engine, and the traders who made it out the other side all describe the same shift: the indicator became a supporting voice, and price structure became the case. One popular RSI account on X puts the working version plainly: the best traders wait for confirmation before they act. That is app-agnostic advice, and it is the correct default no matter which tool from this page sends the ping.

How to choose

• You want one free app that plots, alerts, and screens RSI: TradingView.
• You want to encode your own RSI logic and scan the market with it, free: thinkorswim, if you will invest the learning curve.
• You just want RSI on the phone app you already trade from: Webull.
• You want RSI conditions scanned across watchlists and backtested before you trust them: TrendSpider, if the subscription clears for your frequency.
• You trade forex and want RSI rules automated: MetaTrader, with a backtest first.
• You want today's oversold candidates with zero setup: Finviz.
• You have a chart in front of you and need to know if the RSI reading matters: Quant AI, which reads the trend and levels around it from a screenshot.

Frequently asked questions

What is the best free RSI app?

TradingView, for the combination: a fully adjustable RSI, indicator-value alerts, an RSI filter in the screener, and the largest library of free RSI variants, all on the free plan. Thinkorswim is the strongest free option if you want custom RSI logic and market scans and will tolerate the learning curve. Webull is the easiest free read on a phone.

What settings should RSI be?

Start at the standard 14-period with bands at 70 and 30; that is what most traders and tools use, so the levels others react to line up with yours. Traders running mean-reversion systems sometimes drop to very short periods (the 2-period RSI stack praised on r/pinescript this June follows Larry Connors' published approach), which produces far more signals and demands strict rules. If you hunt divergence in wicks, change the data source to HLC3. Full reasoning is in our RSI indicator guide.

Can an RSI strategy be consistently profitable?

Asked in exactly those words on r/Daytrading this June, and the honest answer is: as a complete system, rarely; as the timing layer of a system, it can contribute. Backtests of simple band rules show results that vary heavily by market and era, which is why the testable platforms here (TrendSpider, thinkorswim, MetaTrader) matter: run the rule against history on your symbols before believing it. Whatever the backtest says, RSI readings at levels that matter beat RSI readings in mid-air.

Is there an app that alerts you when RSI hits 30?

Yes, several. TradingView does it on the free plan (set the alert condition on the RSI indicator itself), thinkorswim does it through study alerts, and TrendSpider and MetaTrader both support it with more automation around it. Consider alerting on the cross back above 30 rather than the touch; it fires once, later, and after the selling has actually stopped.

Do RSI apps work for crypto and forex?

The indicator does; the apps split. TradingView covers stocks, crypto, and forex on one chart, which is the simplest answer. MetaTrader is forex-native. Finviz is US stocks only, and broker apps follow their own market coverage. RSI math is identical everywhere, but thin crypto and forex sessions whip the indicator harder, so weight the daily timeframe more, as covered in the guide linked above.

Can AI read RSI from a screenshot?

Quant AI reads the chart around the indicator: trend, key levels, and the setup forming, from a screenshot of any platform's chart. That is the context an RSI number needs before it becomes a trade. It reads momentum from the price structure itself, so it complements the RSI plotted in the app you screenshot; the alert tells you when to look, and the read tells you what you are looking at.

The bottom line

Plot and alert for free on TradingView, program it for free on thinkorswim, read it for free on Webull, and pay for TrendSpider only when scanning and backtesting RSI conditions becomes your routine. MetaTrader owns the automation lane for forex, and Finviz remains the fastest free "what is oversold today" answer. Then remember what the profitable-trader thread keeps saying: the indicator is the supporting voice. RSI at an extreme is a prompt to read the chart, and that read takes seconds when you screenshot it into Quant AI and see the trend and the levels the number formed against, before deciding whether this alert deserves your money.