Know what a stock is worth
A fair value and a score from 0 to 10 on 500+ US stocks. See in seconds whether a price makes sense.
Stock research for iPhone
Invest with an edge
See what any stock is really worth, find the companies worth a closer look, and know what moves your money before the market opens.
Free to downloadPreOpen Plus is optional
500+ US stocks ratedFair value from SEC filingsAI analyst built in
What you get
Everything you need to invest smarter
Find your next idea
Screen the market by value, quality and momentum, and see where insiders and Congress are putting their money.
Never miss what moves your money
A briefing before the market opens, the day in one read, and an alert the moment something big hits your stocks.
Research
See what a stock is really worth
Every company gets a fair value and a score from 0 to 10, with the reasons behind it: what it's worth, how strong the business is, where the trend points and what investors think.
Fair value
Spot undervalued companies
Fair value set against the price shows you at a glance which stocks trade below what they're worth, and by how much. Worked out from each company's own SEC filings.
The PreOpen Score
One clear score. Four reasons behind it.
Value, business quality, trend and investor mood, each rated from 0 to 100 and rolled into one score you can compare across 500+ stocks.
7.4PreOpen Score · StrongExample
The Screener
Find stocks that fit what you want
Set how much value, quality and momentum matter to you, and get a ranked list of the companies that match in seconds.
Bull and bear
The case for and against, side by side
The strongest points on both sides of every stock, drawn from its accounts and its price, so you see the risks before you decide.
For
Its margins are wider than its industry's
Against
It carries more debt than five years ago
Smart money
Follow the smart money
See what company insiders, members of Congress and the biggest funds have been buying and selling, from their own filings.
InsidersForm 4
CongressSTOCK Act
Funds13F
Stay ahead
Know what moves the market before it opens
Start every day already knowing what matters for your money, and hear about the big moves the moment they happen.
- Before the Bell. What to watch today, ready an hour before Wall Street opens.
- Today's Read. The day's biggest stories and what they mean, in a three-minute read.
- Smart alerts. Big moves in your stocks, earnings as they land, and nothing you don't need.
Examples
Fed holds rates
Nvidia −6.2% today
After the close
Fed holds ratesIt kept rates where they were. What it means for your stocks, in one read.
Nvidia −6.2% todayIts biggest fall in months, as chip shares fell together.
After the closeS&P 500 −1.2%, Nasdaq −2%. Your stocks: NVDA −6%, AAPL +1%. Today's Read is ready.
AI analyst
Your own analyst, on call
Ask about any stock, any move or any term, and get a clear answer built on our data, with the sources to back it up.
Why did chip stocks fall today?
What could move Apple's earnings?
What's driving oil prices this week?
Explain free cash flow simply
Answers are written by AI and can be wrong. They're general information, not personal financial advice.
Also inside
One app for your whole investing day
Crypto
Bitcoin and 21 more coins, with where each stands in its cycle and the case for and against.
Earnings calendar
Every earnings date and Fed decision, with the results on your screen minutes after they land.
Learn
28 short lessons that take you from your first stock to reading a company like a pro.
Widgets
Your stocks and the market pulse on your Home Screen and Lock Screen, in light or dark.
Built on facts
Research you can trust
Ratings come from fixed rules applied to company filings and market data, never from AI guesswork. Every figure is checked around the clock, and every source is named.
Scores by rules, not AI
The same transparent rules for every stock. AI explains the numbers, it never makes them up.
Checked every hour
Every figure in the app is checked each hour, and anything that looks wrong is fixed or held back.
Your data stays yours
No ads, and your data is never sold. We're not a broker and earn nothing from your trades.
Pricing
Start free. Unlock the full picture.
The market news, your daily briefing and a score on every stock are free. Plus adds fair values, the full research and 50 questions a month to your AI analyst.
PreOpen
Everything you need to follow the day.
Free
- Market news, ranked by what matters most
- Your daily briefing: Today's Read and Before the Bell
- A 0–10 score on every stock and market we rate
- The earnings calendar, lessons and the Magazine
- Your portfolio, with alerts on your stocks' moves and news
- Ask: one question a day, up to five a month
PreOpen Plus
The full research, for the decisions that are yours to make.
Yearly
$149.90 a year
7 days free, then $149.90 a year. $12.49 a month, 58% less than paying monthly.
Monthly
$29.90 a month
Billed every month. No free trial.
Research
- Fair value against the price
- The four ratings behind each score
- Financial health of each company we value
- Every check, with bull and bear points
- The Screener and every ranking
Smart money, Ask and alerts
- Insider trades, scored
- Congress's trades and funds' holdings
- Ask: 50 questions a month
- Alerts on fair value, ratings and insiders
- Everything in the free version
Get PreOpen, then try Plus
Subscribe inside the app. Cancel anytime in the App Store. The full list of what Plus opens is in the app before you subscribe.
PreOpen Plus is an optional auto-renewing subscription: $29.90 a month, or $149.90 a year with a 7-day free trial. Payment is charged to your Apple Account when you confirm (after the trial, if you take it). It renews automatically unless cancelled at least 24 hours before the end of the trial or the current period; manage or cancel it in your Apple Account settings. Prices are in US dollars. Terms of Use · Privacy Policy
Questions
Good to know
Is PreOpen financial advice?
No. PreOpen is research, news and education: general information, the same for every reader. Ask's answers are written by AI, can be wrong, and are not advice from a licensed or registered adviser. PreOpen is not a broker or an investment adviser: it doesn't hold or move money and connects to no brokerage account. Decisions about your money are yours. The terms say more.
Where does the information come from?
From companies' own filings with the SEC, official sources such as central banks and statistics agencies, and published news, named and linked under every story. Prices come from market data providers, including Twelve Data and CoinGecko, and economic figures from the Federal Reserve Bank of St. Louis.
PreOpen uses AI (Claude, made by Anthropic, and Grok, made by xAI, for posts on X and some research briefs) to read the sources and write in plain words, and says so on what it writes. The scores and fair values are our own arithmetic, worked out by fixed rules.
Can I trust ratings made with AI?
The scores aren't written by AI. They're worked out by fixed rules from filings, prices, trading and what investors are saying, the same for every stock. AI writes the stories and explanations, and our Guardian reads each one we publish against our data.
What's free, and what does Plus cost?
Free: the news, Today's Read and Before the Bell, every stock's PreOpen Score, the calendar, Explore, Learn, your portfolio with alerts on your own stocks, and one question a day to Ask, up to five a month.
PreOpen Plus opens fair values, the four ratings, every check with bull and bear points, the Screener, Smart money, 50 questions a month to Ask and more alerts. It's $149.90 a year with a 7-day free trial, or $29.90 a month.
How do I cancel Plus, and what about refunds?
PreOpen Plus is billed by Apple, so you manage it in your Apple account: on your iPhone, open Settings, tap your name, then Subscriptions, then PreOpen. Cancel at least 24 hours before it renews, or before a free trial ends, to avoid the next charge; you keep Plus until the end of the period you paid for. Refunds are handled by Apple at reportaproblem.apple.com.
Where can I get PreOpen?
On the App Store in the United States, for iPhone.
Something else? Write to hello@preopen.com. A person reads every message.
Make your next move an informed one
Download PreOpen free and see what your stocks are really worth.
Free to download · iPhone · PreOpen Plus is optional