Letters and Reviews adds 13F coverage that Prospero.ai skips.
VOL. XCIV, NO. 247
★ FINANCIAL TOOLS & SERVICES DIRECTORY ★
PRICE: 5 CENTS
Saturday, November 1, 2025
Tool Comparison
Letters and Reviews vs Prospero.ai comparison
Compare pricing, supported platforms, categories, and standout capabilities to decide which tool fits your workflow.
Quick takeaways
Prospero.ai includes Screeners, ETF Screeners, Data Visualizations, Options & Derivatives, Watchlist, Alerts, Market Sentiment, Dark Pool & Off-Exchange, Scores, Education, and Newsletters categories that Letters and Reviews omits.
Prospero.ai offers mobile access, which Letters and Reviews skips.
In depth comparison
Letters and Reviews
lettersandreviews.blogspot.com
Free, personal curation site that aggregates **fund manager letters**, tickers mentioned in those letters, and **quarterly 13F** filer lists the author follows. Each quarter page links to original letters and maps tickers to quick‑reference pages; some 13F pages embed holdings tables and activity (new/increased/decreased/sold) for many managers. Also includes a small **Podcasts** list. No accounts, alerts, exports, or API—think link‑hub for primary sources rather than a data platform.
Categories
Platforms
Web
Pricing
Free
Quick highlights
- Quarterly **Fund Manager Letters** pages with the fund name, date, and a ‘Stocks Mentioned’ column (tickers link out for quick lookup).
- Quarterly **13‑F pages** the author reads, with many entries including holdings tables and position‑change flags (e.g., NEW / Sold Out / % of portfolio).
- Lightweight **About** page clarifies the goal: stock‑idea discovery from letters; author shares links and invites tips via @_iinvested.
- A small **Podcasts** page curating investing/finance episodes the author plans to re‑listen to.
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Prospero.ai
prospero.ai
Mobile-first AI signals app for U.S. stocks & ETFs. Offers 10 proprietary signals (5 short-term: Net Options Sentiment, Net Social Sentiment, Net Institutional Flow, Dark Pool, Short Pressure; 5 long-term: Upside/Downside Breakout, Profitability, Growth, Market Similarity), plus a Daily Screener, ‘Our Picks’, watchlists, and notifications. No broker sync, public API, or advanced options greeks/IV surfaces are documented.
Categories
Platforms
Mobile
Pricing
Free
Quick highlights
- Ten proprietary signals: 5 short-term (Options/Social/Institutional/Dark Pool/Short Pressure) and 5 long-term (Upside/Downside Breakout, Profitability, Growth, Market Similarity).
- Short-term Net Options Sentiment updates ~every 2–5 minutes (real‑time orientation).
- Daily Screener & ‘Our Picks’ lists to surface candidates quickly for different horizons (long/short, short‑term/long‑term).
- Mobile apps on iOS and Android with watchlists and in‑app notifications.
- Education hub with plain‑English signal docs plus investing/trading newsletters (Substack).
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Where they differ
Letters and Reviews
Distinct strengths include:
- Quarterly **Fund Manager Letters** pages with the fund name, date, and a ‘Stocks Mentioned’ column (tickers link out for quick lookup).
- Quarterly **13‑F pages** the author reads, with many entries including holdings tables and position‑change flags (e.g., NEW / Sold Out / % of portfolio).
- Lightweight **About** page clarifies the goal: stock‑idea discovery from letters; author shares links and invites tips via @_iinvested.
- A small **Podcasts** page curating investing/finance episodes the author plans to re‑listen to.
Prospero.ai
Distinct strengths include:
ScreenersETF ScreenersData VisualizationsOptions & DerivativesWatchlistAlertsMarket SentimentDark Pool & Off-Exchange
- Ten proprietary signals: 5 short-term (Options/Social/Institutional/Dark Pool/Short Pressure) and 5 long-term (Upside/Downside Breakout, Profitability, Growth, Market Similarity).
- Short-term Net Options Sentiment updates ~every 2–5 minutes (real‑time orientation).
- Daily Screener & ‘Our Picks’ lists to surface candidates quickly for different horizons (long/short, short‑term/long‑term).
- Mobile apps on iOS and Android with watchlists and in‑app notifications.
Feature-by-feature breakdown
| Attribute | Letters and Reviews | Prospero.ai |
|---|---|---|
Categories Which research workflows each platform targets | Shared: Stock Ideas, Blogs Unique: 13F | Shared: Stock Ideas, Blogs Unique: Screeners, ETF Screeners, Data Visualizations, Options & Derivatives, Watchlist, Alerts, Market Sentiment, Dark Pool & Off-Exchange, Scores, Education, Newsletters |
Asset types Supported asset classes and universes | Stocks, ETFs | Stocks, ETFs |
Experience levels Who each product is built for | Beginner, Intermediate, Advanced | Beginner, Intermediate |
Platforms Where you can access the product | Web | Mobile |
Pricing High-level pricing models | Free | Free |
Key features Core capabilities called out by each vendor | Unique
| Unique
|
Tested Verified by hands-on testing inside Find My Moat | Not yet | Not yet |
Editor pick Featured inside curated shortlists | Standard listing | Standard listing |
Frequently Asked Questions
Which workflows do Letters and Reviews and Prospero.ai both support?
Both platforms cover Stock Ideas, and Blogs workflows, so you can research those use cases in either tool before digging into the feature differences below.
Do Letters and Reviews and Prospero.ai require subscriptions?
Both Letters and Reviews and Prospero.ai keep freemium access with optional paid upgrades, so you can trial each platform before committing.
Which tool has mobile access?
Prospero.ai ships a dedicated mobile experience, while Letters and Reviews focuses on web or desktop access.
What unique strengths set the two platforms apart?
Letters and Reviews differentiates itself with Quarterly **Fund Manager Letters** pages with the fund name, date, and a ‘Stocks Mentioned’ column (tickers link out for quick lookup)., Quarterly **13‑F pages** the author reads, with many entries including holdings tables and position‑change flags (e.g., NEW / Sold Out / % of portfolio)., and Lightweight **About** page clarifies the goal: stock‑idea discovery from letters; author shares links and invites tips via @_iinvested., whereas Prospero.ai stands out for Ten proprietary signals: 5 short-term (Options/Social/Institutional/Dark Pool/Short Pressure) and 5 long-term (Upside/Downside Breakout, Profitability, Growth, Market Similarity)., Short-term Net Options Sentiment updates ~every 2–5 minutes (real‑time orientation)., and Daily Screener & ‘Our Picks’ lists to surface candidates quickly for different horizons (long/short, short‑term/long‑term)..
Keep exploring
Keep exploring
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Curation & Accuracy
This directory blends AI‑assisted discovery with human curation. Entries are reviewed, edited, and organized with the goal of expanding coverage and sharpening quality over time. Your feedback helps steer improvements (because no single human can capture everything all at once).
Details change. Pricing, features, and availability may be incomplete or out of date. Treat listings as a starting point and verify on the provider’s site before making decisions. If you spot an error or a gap, send a quick note and I’ll adjust.