VOL. XCIV, NO. 247

★ FINANCIAL TOOLS & SERVICES DIRECTORY ★

PRICE: 5 CENTS

Monday, October 20, 2025

View BuySide Digest — Hedge Fund Letter DatabaseView Prospero.ai Home My Collections

Head-to-head

BuySide Digest — Hedge Fund Letter Database vs Prospero.ai comparison

Compare pricing, supported platforms, categories, and standout capabilities to decide which tool fits your workflow.

Quick takeaways

BuySide Digest — Hedge Fund Letter Database adds News, 13F, and Investor Holdings coverage that Prospero.ai skips.

Prospero.ai includes Screeners, ETF Screeners, Data Visualizations, Options & Derivatives, Market Sentiment, Dark Pool & Off-Exchange, Scores, Education, and Blogs categories that BuySide Digest — Hedge Fund Letter Database omits.

BuySide Digest — Hedge Fund Letter Database highlights: Search by fund, CIO, ticker, keyword, theme; filter by quarter; columns include QTD/YTD perf where available., Per‑fund pages with letter history (table shows latest two; ‘View’ for more)., and Follow funds or tickers and get inbox updates when new letters drop..

Prospero.ai is known 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)..

Prospero.ai offers mobile access, which BuySide Digest — Hedge Fund Letter Database skips.

BuySide Digest — Hedge Fund Letter Database logo

BuySide Digest — Hedge Fund Letter Database

buysidedigest.com

Free, searchable database of hedge‑fund investor letters with filters by fund, CIO, ticker, keyword, theme, and quarter. Includes BSD 13F tools (tracker + holdings reports) and curated ‘Elevator Pitches’. Users can follow funds/tickers and receive email updates as new letters are added. Aggregates publicly available letters; no paid tier or API publicly documented.

Platforms

Web

Pricing

Free

Quick highlights

  • Search by fund, CIO, ticker, keyword, theme; filter by quarter; columns include QTD/YTD perf where available.
  • Per‑fund pages with letter history (table shows latest two; ‘View’ for more).
  • Follow funds or tickers and get inbox updates when new letters drop.
  • BSD 13Fs: investor screener + reports (largest buys/sells, consensus holdings, GICS weights, bargains vs. prior buys, etc.).
  • ‘Elevator Pitches’: concise stock ideas extracted from letters; weekly BSDigest newsletter.

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Prospero.ai logo

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.

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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Overlap

Shared focus areas

4 overlaps

Mutual strengths include Stock Ideas, Newsletters, and Watchlist plus 1 more area.

Where they differ

BuySide Digest — Hedge Fund Letter Database

Distinct strengths include:

News
13F
Investor Holdings
  • Search by fund, CIO, ticker, keyword, theme; filter by quarter; columns include QTD/YTD perf where available.
  • Per‑fund pages with letter history (table shows latest two; ‘View’ for more).
  • Follow funds or tickers and get inbox updates when new letters drop.
  • BSD 13Fs: investor screener + reports (largest buys/sells, consensus holdings, GICS weights, bargains vs. prior buys, etc.).

Prospero.ai

Distinct strengths include:

Screeners
ETF Screeners
Data Visualizations
Options & Derivatives
Market Sentiment
Dark Pool & Off-Exchange
Scores
Education
  • 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

AttributeBuySide Digest — Hedge Fund Letter DatabaseProspero.ai
Categories

Which research workflows each platform targets

Shared: Stock Ideas, Newsletters, Watchlist, Alerts

Unique: News, 13F, Investor Holdings

Shared: Stock Ideas, Newsletters, Watchlist, Alerts

Unique: Screeners, ETF Screeners, Data Visualizations, Options & Derivatives, Market Sentiment, Dark Pool & Off-Exchange, Scores, Education, Blogs

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

  • Search by fund, CIO, ticker, keyword, theme; filter by quarter; columns include QTD/YTD perf where available.
  • Per‑fund pages with letter history (table shows latest two; ‘View’ for more).
  • Follow funds or tickers and get inbox updates when new letters drop.
  • BSD 13Fs: investor screener + reports (largest buys/sells, consensus holdings, GICS weights, bargains vs. prior buys, etc.).
  • ‘Elevator Pitches’: concise stock ideas extracted from letters; weekly BSDigest newsletter.
  • Hosts/links original PDFs for many historical letters (e.g., Baupost archive).

Unique

  • 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).
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 BuySide Digest — Hedge Fund Letter Database and Prospero.ai both support?

Both platforms cover Stock Ideas, Newsletters, Watchlist, and Alerts workflows, so you can research those use cases in either tool before digging into the feature differences below.

Do BuySide Digest — Hedge Fund Letter Database and Prospero.ai require subscriptions?

Both BuySide Digest — Hedge Fund Letter Database 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 BuySide Digest — Hedge Fund Letter Database focuses on web or desktop access.

What unique strengths set the two platforms apart?

BuySide Digest — Hedge Fund Letter Database differentiates itself with Search by fund, CIO, ticker, keyword, theme; filter by quarter; columns include QTD/YTD perf where available., Per‑fund pages with letter history (table shows latest two; ‘View’ for more)., and Follow funds or tickers and get inbox updates when new letters drop., 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

Stay on top of related tools

Browse the categories and profiles that overlap most with this comparison to round out your shortlist.

Recommended tools

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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.