Prospero.ai
Free iOS and Android app that turns institutional market data into 10 proprietary signals — five short-term, five long-term — to rank US-listed stocks and ETFs for self-directed retail investors and traders. Paid Substack newsletters are optional extras.
What is Prospero.ai?
Prospero.ai is a mobile stock-analysis app published by Prospero.ai LLC and available on iOS and Android. Its stated ambition is to narrow the gap between institutions and individuals — the company frames its mission as leveling the playing field in investing, and adds: At Prospero.ai, we believe everyone should get a fair opportunity to invest like Hedge Funds. The method is deliberately reductive: aggregate institutional and market data, then compress it into ten readable signals instead of a wall of indicators. Five signals cover a long horizon of roughly two months to two years: Upside Breakout, Downside Breakout, Profitability, Market Similarity and Growth, summarised by a Long-Term Signals Overview. Five cover a one-to-two-month horizon: Net Options Sentiment, Net Social Sentiment, Net Institutional Sentiment, Dark Pool Rating and Short-Pressure Rating. The publisher's own definition is explicit: We use data science, machine learning, and artificial intelligence to create 5 short-term and 5 long-term signals that can be used to rank US stocks and ETFs against each other. The signals are comparative — they rank securities against one another — and coverage stops at US-listed stocks and ETFs. Inside the app you search by ticker or company name, follow four Our Picks lists (Long Term Bull, Short Term Bull, Long Term Bear, Short Term Bear), read a Daily Screener, keep a watchlist that alerts you when a signal changes, and work through an in-app learning guide mirrored by an online Learning Center documenting each signal. A 'Daily Stock Picks' feature is still flagged as coming soon. The publisher claims 100+ million data points analysed, 10,000+ AI/ML models, 13+ years of institutional predictive-pipeline experience, and picks outperforming the S&P 500 by 12.9x; results published since 2023 cite roughly 5,000 picks, a 54% success rate and 27% more return than the index, with 60% for the 2025 cohort. All are publisher claims, framed by its own disclaimer that these are model outputs, not actual trading results. Intellectual property is presented as jointly held with NYU. The app executes nothing: Prospero.ai is neither a broker nor an adviser. Two paid Substack newsletters and a Discord community with direct access to the CEO sit alongside it.
What it does
- Look up any US-listed stock or ETF and read its 10 proprietary signals
- Follow Our Picks, four curated lists: Long Term Bull, Short Term Bull, Long Term Bear and Short Term Bear
- Browse the Daily Screener and its accompanying daily explanation
- Receive alerts when a signal changes on a stock you follow
- Track a portfolio through the watchlist
- Learn to read each signal through the in-app guide and the online Learning Center
When to use Prospero.ai / When not to
A quick filter to help you decide if Prospero.ai is the right fit.
When to use Prospero.ai
- Self-directed retail investors who already have a well-tested strategy and want a quantitative second opinion on it
- Swing traders working a one-to-two-month horizon, where the short-term options, social and institutional sentiment signals apply
- Long-term investors screening US-listed stocks and ETFs over a two-month to two-year horizon
- Intermediate to expert investors comfortable interpreting signal scores rather than following ready-made recommendations
- Cost-conscious users who want to evaluate an analysis tool with no paywall at sign-up, since the app is entirely free
When not to use Prospero.ai
- Complete beginners looking for a single authoritative source: the publisher explicitly advises against using Prospero.ai as your only source of market intelligence
- Investors trading outside US-listed stocks and ETFs: no international markets, no crypto, no forex
- Anyone expecting order execution or brokerage services, since the app places no trades and is not a broker
- Users seeking personalised investment advice, which the publisher disclaims outright
- Desktop or browser-based workflows: the product ships as a mobile app only, on iOS and Android
How to use Prospero.ai
A typical end-to-end flow, from setup to results.
- Download the app from the App Store or Google Play and create a free account
- Start with the in-app learning guide, which explains what each of the ten signals measures
- Search a ticker or company name to display that security's short-term and long-term signals
- Browse Our Picks and its four lists to find a stock matching your own strategy
- Check the Daily Screener and the daily note explaining how the selection was built
- Add the securities you follow to your watchlist to receive alerts when a signal changes
- Test the signals in paper trading before committing real money, as the publisher recommends
- Optionally subscribe to a Substack newsletter for written context around the signals
- Delete your account from Profile > Account Settings > Delete My Account if you stop using the app
Pros & Cons
Pros
- The app is entirely free on iOS and Android, with no paywall at sign-up
- Every signal is defined and documented individually in a publicly accessible Learning Center
- Teaching material is built in: an in-app guide plus a web resource centre
- Performance results are published and dated, with a methodology note and an explicit disclaimer
- Short-term and long-term horizons are covered in the same tool
- Google Play's Data safety card reports that no data is shared with third parties
- Direct access to the team and the CEO through Discord and livestreams, plus genuine press coverage (Fast Company, USA Today, Forbes, Yahoo Finance, VentureBeat)
Cons
- The legal documents are unreadable: terms, privacy policy and cookie policy are empty Termly embeds, leaving no contractual, GDPR, retention or hosting information
- No postal address and no legal or privacy email address are published on the site
- Mobile only: there is no web or desktop version
- No public API and no documented third-party integration
- Coverage is restricted to US-listed stocks and ETFs
- The publisher itself advises against using the tool as a sole source and positions it for intermediate to expert investors
- Published performance figures are model results, not real trading results: The results presented here relate solely to signals generated by our models and systems and are not actual trading results.
Pricing & Plans
A free plan is available: the Prospero.ai app can be downloaded and used at no cost on both iOS and Android, with no paywall at sign-up. Premium tiers are referenced in the publisher's own content, said to unlock deeper screener capabilities and additional data feeds, but no price list is published and the site has no pricing page. The lowest published price point is USD 9.99 per month for the Investing Newsletter on Substack, or USD 99.99 per year, preceded by a 7-day free trial. The separate Trading Letter is priced at USD 20 per month or USD 200 per year. Newsletter billing is handled by Substack, not by Prospero.ai.
- App (iOS and Android) — free
- App Premium — announced by the publisher
- price not published
- Investing Newsletter Monthly — USD 9.99 per month
- 7-day free trial
- Investing Newsletter Annual — USD 99.99 per year
- Investing Newsletter Founding Member — USD 199
- Trading Letter Monthly — USD 20 per month
- Trading Letter Annual — USD 200 per year
Data, GDPR & hosting
A consolidated view of how Prospero.ai handles your data.
GDPR overview
There is no GDPR statement of any kind. The three pages that would carry one — terms, privacy policy and cookie policy — are Termly embeds whose documents have been deleted, so they render empty, and the /privacy-notice URL declared to Apple redirects to the same blank page. No Article 27 EU representative, no data protection officer, no privacy contact address and no compliance claim appear anywhere in the accessible content; the publisher neither asserts nor denies GDPR compliance. Prospero.ai LLC is a US company and the product covers US markets, but nothing states whether EU users are in scope. The only remedies observed are operational rather than contractual: in-app account deletion, the deletion request path declared on Google Play, and the support ticket form on support.prospero.ai.
Who owns the data?
No answer can be sourced from the publisher's own documents. The terms, privacy policy and cookie policy pages are Termly embeds whose underlying document has been deleted, so no data-ownership clause is published anywhere, and the /privacy-notice URL declared to Apple redirects to the same blank page. The only structured statements available come from the app stores. Google Play's Data safety card states that no data is shared with third parties, that data is encrypted in transit, and that users can request deletion. Apple's App Privacy card lists usage, crash, performance and other data as not linked to the user's identity. Account deletion is available in the app, under Profile > Account Settings > Delete My Account, or by support ticket.
Reuse rights
Nothing is published on how collected data is used, or on what users may do with the signals and screener output they consult: the privacy policy and terms are not readable, so no licence, reuse or redistribution clause exists to cite. The verifiable declarations are limited to the store cards. Google Play lists Personal info, App activity and 2 others as collected categories and states 'No data shared with third parties'. Apple reports usage, diagnostic and performance data, not linked to identity. The website itself is instrumented with Google Analytics and with Amplitude, whose session replay is active at 100% sampling. Newsletter sign-up and billing are handled by Substack, under Substack's own policies rather than Prospero.ai's.
Data retention & training
Hosting summary
No hosting country, region or jurisdiction is published. The documents that would state it — the terms and the privacy policy — are Termly embeds whose content has been deleted, so nothing can be established about where user data is stored or under which law it is processed. Only a few technical facts are verifiable from the outside: the website is built on Webflow and served behind Cloudflare (AS209242, anycast), which says something about the delivery of the marketing site but nothing about the app's back end. Google Play's Data safety card declares that data is encrypted in transit. The two newsletters are hosted and billed by Substack, so subscriber and payment data sits with Substack under its own terms. Readers with a data residency requirement should treat this as unresolved rather than as an implicit US-only arrangement.
Things to keep in mind
Risks and trade-offs to weigh before adopting Prospero.ai.
- No contractual safety net: the terms, privacy policy and cookie policy are empty Termly embeds, so you accept conditions you cannot read
- No postal address and no legal or privacy email address are published, which leaves no formal channel for a dispute or a data request
- The headline performance figures are model results rather than real trading results, and reading them as a track record would be a mistake
- The tool analyses, it does not advise: no recommendation is personalised to your situation, your horizon or your risk tolerance
- Signal-change alerts on a watchlist reward frequent checking, which can nudge a long-term investor towards over-trading
- Delegating judgement to a score is a real risk: the publisher itself says the app should not be your only source of market intelligence
- The website runs Amplitude session replay at 100% sampling, so browsing behaviour is recorded, and the /about-us page contradicts itself on the leadership team's roles
Setup & Integrations
Technical difficulty
Very low. Setting up means downloading a mobile app and creating a free account: there is no integration to build, no API key to obtain and no configuration to plan. The real effort is interpretive rather than technical, since the value depends on understanding what each of the ten signals measures and how to combine them. The publisher directs new users to the in-app learning guide first, then recommends testing the signals in paper trading before committing real money.
Deployment
Apps stores
Supported languages
Behind Prospero.ai
Fundraising
Social
Resources
All the official URLs gathered for verification and reference.
Alternatives
Tools that compete with or complement Prospero.ai.
Frequently asked questions
Is Prospero.ai free?
Which securities does the analysis cover?
How many signals are there?
Is there a web version?
Is there an API?
Who is the tool aimed at?
Does Prospero.ai place trades?
How do I delete my account?
How much do the newsletters cost?
What does the privacy policy say?
Should you pick Prospero.ai?
Prospero.ai is a substantial product wrapped in unusually thin paperwork. On substance, the app delivers what it describes: ten signals, each documented individually in a public Learning Center, an in-app learning guide, four curated pick lists, a daily screener and signal-change alerts, all on a free iOS and Android app with no paywall at sign-up. Published performance figures are dated and carry both a methodology note and a disclaimer stating they are model outputs rather than real trading results — a caution many comparable tools skip. Press coverage in Fast Company, USA Today, Forbes, Yahoo Finance and VentureBeat is real, and direct access to the team through Discord and livestreams is unusual at this price point, which is to say none. The reservations are equally clear. The three legal pages — terms, privacy policy and cookie policy — are Termly embeds whose documents have been deleted, so there is no readable contract, no GDPR statement, no retention rule and no hosting disclosure. No postal address, legal contact or privacy contact appears anywhere on the site. Coverage stops at US-listed stocks and ETFs; there is no web version, no API and no documented integration. The publisher itself advises against using Prospero.ai as a sole source and positions it for intermediate to expert investors, and one headline feature, Daily Stock Picks, is still marked as coming. The natural fit is a self-directed retail investor who already has a tested method and wants a quantitative second opinion on US equities. Because the entry cost is zero, evaluating the app costs only time. The legal opacity, on the other hand, is a genuine consideration for anyone based in the EU, or for anyone who wants to know where their data goes before installing an app.
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