Acronyms in the app show a control. Hover for a quick definition; click to jump here.
Momentum oscillator that measures the speed and magnitude of recent price changes on a 0–100 scale.
In this app, RSI(14) uses Wilder’s smoothing. Confirmed values update on completed bars; provisional values update as the current bar forms. Threshold rules can evaluate either mode.
RSI = 100 − 100 / (1 + Average Gain / Average Loss)
Related: SMA, EMA, Provisional
Arithmetic mean of closing prices over a fixed lookback window.
SMA(20) averages the last 20 completed closes. It reacts more slowly than EMA and is shown as a gold overlay on the symbol chart.
SMA(n) = (C₁ + C₂ + … + Cₙ) / n
Moving average that weights recent closes more heavily than older ones.
EMA(20) updates incrementally with a smoothing factor of 2/(period+1). It is shown as a blue overlay on the symbol chart.
EMAₜ = Closeₜ · k + EMAₜ₋₁ · (1 − k), k = 2/(n+1)
Volatility measure based on true range (high–low and gaps vs prior close).
ATR(14) is expressed in price units of the symbol. Higher ATR means wider typical swings; it does not indicate direction.
TR = max(High−Low, |High−PrevClose|, |Low−PrevClose|); ATR = Wilder average of TR
Related: NATR
ATR expressed as a percentage of price, so volatility is comparable across symbols.
NATR(14) ≈ 100 × ATR(14) / Close. Useful when comparing a $30 stock to a $300 stock.
NATR = 100 × ATR / Close
Related: ATR
Number of shares (or contracts) traded during a bar.
Confirmed Volume is the completed bar’s traded volume. Provisional Volume is the forming bar’s cumulative volume as trades arrive. High volume can confirm moves but is not a directional signal by itself.
Volume = Σ trade sizes in the bar
Related: Confirmed, Provisional
Indicator estimate using the still-forming bar; may revise until the bar completes.
Provisional RSI can fire tentative threshold states when evaluation mode allows it. Confirmed values are preferred for durable alerts.
Related: RSI
Indicator value locked in after a bar closes; stable for historical and live evaluation.
Default threshold evaluation uses confirmed bars so alerts are less sensitive to intrabar noise.
Related: RSI, Provisional
The best (highest) bid and best (lowest) offer across U.S. exchanges at a point in time.
Full NBBO requires a consolidated quote feed. Free Finnhub trade streams are IEX-oriented and do not provide complete NBBO; bid/ask in this app often come from REST snapshots.
A U.S. stock exchange. Some free market-data tiers stream IEX-oriented trades rather than full SIP tape.
Finnhub’s free WebSocket is commonly IEX-focused. Treat live prints as a useful but incomplete view of the broader market.
Related: NBBO
Persistent bidirectional connection used to push live market state to the browser.
The browser connects to the market-data service with a short-lived signed token. Updates are batched (~150ms) to reduce UI thrash.
Related: IEX
Bid is what buyers are willing to pay; ask (offer) is what sellers are asking.
When bid or ask is missing, the provider did not supply a usable quote. Do not assume mid = last trade.
A fund that trades on an exchange like a stock and typically holds a basket of assets.
Search and watchlist support U.S. ETFs alongside common stocks. Indicator math is the same; underlying holdings are not expanded in the MVP.
A U.S.-listed certificate representing shares of a non-U.S. company.
ADRs can appear in symbol search depending on the active provider. Corporate-action and currency nuances are out of scope for the current slice.
A company that owns or finances income-producing real estate and trades like equity.
Example in the demo watchlist path: WY (Weyerhaeuser). REITs are treated as regular equity symbols for indicators and thresholds.
Condition must remain true for a configured number of seconds before an alert fires.
Reduces one-tick spikes. Combine with hysteresis so the machine rearms only after the indicator moves far enough away.
Related: Hysteresis, Cooldown
After an alert, the condition must clear beyond a second level before monitoring can rearm.
Example: alert when RSI ≤ 30, rearm only after RSI rises above 35. Prevents alert chatter around the boundary.
Minimum wait after an alert before another activation cycle can start.
Works with hysteresis and dwell as part of the threshold state machine.
Related: Dwell, Hysteresis
ALL requires every rule to match; ANY alerts if at least one rule matches.
Used by the multi-rule threshold builder on the symbol page.
Related: RSI
Unrealized gain or loss on open holdings versus purchase cost basis.
Live P/L here marks holdings at the last eligible trade: quantity × last trade − (quantity × purchase price + fees). It is not a bid liquidation value and does not include taxes or borrow costs.
Related: NBBO