Monitor the stock market for me.

JujsyAlpha

Most apps tell you what to buy. This one tells you how often it's wrong.

It watches the S&P 500 on daily closes and tells you when something crosses a level you chose — and, before you agree to it, how often that alert has fired and how often the crossing didn't hold.

Watching
503
Said something
33
Your phone
1 a weekday

Every figure in this deck was read from the live API at the close of 14 September 2026, and is stamped rather than refreshed — the same rule the app applies to itself.

What it measures

Two different questions about the same stock

RSI asks: is this stretched right now?

Short-horizon, about the last fortnight of trading, and measured against this stock's own recent range. It says nothing about whether the company is any good.

Composite asks: how does it stand among 503?

Earnings, price strength, quality, buying pressure and sector, ranked across the index. It says nothing about whether today is a sensible day to act.

Every stock has both, always — and one page shows them together, with whichever one you arrived through leading and the other a tap away.

Neither is a recommendation. They are two measurements, published side by side, and the app never combines them into a verdict.

Daily RSI

On 14 September, 470 of 503 stocks had nothing to say

RSI measures how hard a stock has been bought or sold over the last 14 sessions, on a 0–100 scale. Most of the time it sits in the middle and means nothing. Its value is how rarely it speaks.

Where 503 stocks sat on the RSI scale on 14 September On 14 September 2026: 29 stocks below 30, 470 between 30 and 70, and 4 above 70. 0 30 70 100 29 selling looks stretched 470 nothing to report — no alert, no noise 4 buying stretched

Daily closes, not hourly. An hourly chart crosses these levels constantly and most of it is noise. A stock reaching oversold is a roughly twice-a-year event, which is what makes it worth a notification.

Daily RSI

A reading on its own is nearly useless

"RSI 63" tells you very little. What matters is where that sits in this stock's own recent range, and how much this stock moves in a day. Both travel with every reading.

Apple's RSI on 14 September inside its own three-month range Apple read 63.3 on 14 September, the 79th percentile of its own three-month range of 32.2 to 71.7, with an average of 54. AAPL · ITS OWN LAST THREE MONTHS 32.2 71.7 avg 54.0 63.3 79th percentile of its own range Moves 2.33% on an average day · ranging, not trending published beside the reading, not left for you to work out

Why it matters. A five-point RSI move on a stock that travels 0.8% a day is a different event from the same move on one that travels 4%. That day 241 of 503 were ranging and 145 trending — the same reading means different things in each.

Composite Score

A rank against the other 502, recomputed every day

Not a score out of 100 with a fixed pass mark. A percentile: 90 means top 10% today. So it moves when the field moves, and it cannot drift into everything looking good at once.

How the 503 scores were distributed on 14 September 47 stocks scored 90 or above, 98 scored 80 or above, and the median is 50.1 — a percentile rank by construction. median 50.1 90+ 503 ranked, every trading day 98 score 80 or better 47 score 90 or better

47 of 503 was 9.3% — close to a tenth, because that is what a percentile rank means rather than a threshold someone picked.

Composite Score

Five things about the company, weighted and shown

Tap any score and it opens into its parts, with the weights the scoring job actually ran with — read back from the job, not typed into the app.

The five components of the Composite Score and their weights Earnings growth 35%, price strength 25%, business quality 20%, buying pressure 10%, sector 10%. Earnings growth Price strength Business quality Buying pressure Its sector 35% 25% 20% 10% 10%

And it tells you it isn't ready. Ask the app how deep this history goes and it answers: 13 days, "too little to read a frequency from — treat any number as provisional." That sentence is in the product, not in a disclaimer.

Price alerts

Intraday is noise, and we filter it out

A price pokes through your level during the day and closes back under it more often than not. Alerts are judged on the closing price, so that poke is filtered out before it ever reaches your phone.

440 level touches, and what became of them Of 440 touches, 211 were intraday only and never notify; 229 closed through and notify once; of those 97 were back within three sessions. 440 TOUCHES 211 intraday only — filtered out 229 closed through — you are told, once OF THOSE 229 97 back within three sessions 132 held You are told about 229 — and told that 4 in 10 of them come back. Both numbers are on screen before you save the alert.
didn't hold held

How this was measured. 500 sessions to 2026-09-14, eight widely held S&P 500 stocks, at round levels across each stock's range.

How it behaves

Three things alert apps usually don't do

ONCE

Told on the crossing, not every day after

A stock that stays oversold for three weeks is one notification, not twenty-one.

BEFORE

Told how noisy it will be before you agree to it

Every alert shows how often it would have fired on the stocks you picked — measured on the same bars that will decide it.

ADMITS

Says when it can't tell you

A stock with too little history is named, not quietly dropped. A score that couldn't be read says so rather than showing zero.

One notification per weekday, naming everything that crossed, evaluated after the close on the settled daily bar — not on a price that is still moving.

Limits

What it will never do

  • Never tell you what to buy. It reports that a condition you chose was met. Every screen says "signal only — not financial advice", and nothing in it ranks what to purchase.
  • Never show a number without saying when it is from. An intraday reading is labelled intraday; a close is labelled a close. The two are never rendered the same way.
  • Never charge you for watching. Prices, indicators, rankings and history are free and need no account. What costs money is being told.
Alpha

Try it now!

Create an account, know your favorite companies and set meaningful alerts, so you can find out when the condition is right.

Currently in alpha on TestFlight, US-listed S&P 500 constituents only. JujsyAlpha is not a broker and does not place orders.

1 / 10

Where TestFlight sends the invite, so it has to be the address your Apple Account uses.

We read every one and reply by email. If you are in, the message carries a TestFlight invite and how to install it. What we do with this.

See what it does

alpha.jujsy.co
Scan to open this on a phone, or pass it on to somebody who should be one of the ten.

Everything you need

Professional-grade signals, built for individual investors

📊

RSI Signals

RSI across the full S&P 500, recomputed through the session. Alerts fire on the crossing, once per event — not on every bar a stock stays there.

⭐

Composite Score

A single 1–99 score recomputed daily from five measures — earnings growth, relative price strength, sales and margins, accumulation, and industry group strength — then ranked against the rest of the index.

🔔

Push Notifications

Alerts on your own thresholds, delivered to your iPhone. Watch one stock, your own watchlist, a whole sector, or the entire index — one rule, resolved when it is evaluated, so adding a stock to your list covers it everywhere.

📈

RSI History Charts

View how RSI moved over time for any stock. 30, 60, and 90-day charts with signal dots and zone bands overlaid.

🕐

Signal History

6 months of historical signals grouped by day. Filter by buy, sell, or strongest signals. Tap any row to see the full chart.

🌙

Extended Hours

Pre-market and after-hours prices from 4 AM to 8 PM ET, shown as context. Never computed on: extended bars report zero volume, so an RSI over them would be noise firing real alerts.

See every screen › Captured from the app, not drawn in a mockup.