VOL. XCIV, NO. 247

★ A CURATED DIRECTORY OF FINANCIAL TOOLS ★

PRICE: 5 CENTS

Thursday, December 11, 2025

Tool Comparison

Portfolio123 vs Stock Spinoff Investing comparison

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

Quick takeaways

Portfolio123 adds Screeners, Data Visualizations, Quant, Portfolio, Watchlist, Backtesting, Correlation, Financials, GDP, Interest Rates, Unemployment Rates, Consumer Sentiment, Housing & Construction, Data APIs, APIs & SDKs, Broker Connectors, and Education coverage that Stock Spinoff Investing skips.

Stock Spinoff Investing includes Calendar, Spin-offs, and Newsletters categories that Portfolio123 omits.

In depth comparison

Portfolio123

portfolio123.com

Editor’s pick Hands-on review

Rules‑based quant research and portfolio‑management platform. Free Manage module covers multi‑account tracking, watchlists, and broker connectivity, while paid Research/DataMiner/API tiers unlock multifactor ranking, screening, long history backtests, AI Factor, and programmatic access. API & DataMiner use an API‑credit system with monthly caps that depend on your membership; the 21‑day paid Research trial excludes API/DataMiner and runs on a limited history slice.

Platforms

WebAPIDesktop

Pricing

FreeSubscription

Quick highlights

Web‑based quant research terminal for building multifactor ranking systems, stock/ETF screens, and complete rules‑based strategies with no programming, powered by point‑in‑time FactSet data and marketed as free of survivorship and look‑ahead bias.
Supports realistic simulations and backtests over roughly 20 years of history for US, Canadian, and European equities, with custom universes, separate buy/sell rules, position sizing, hedging, and “Book of Strategies” to combine and analyze correlated systems.
Stock & ETF coverage uses fundamentals, estimates, corporate actions, plus industry/sector classification, with “over 15,000 current US, Canadian, and European stocks” and many more historical issues.
AI Factor lets users train machine‑learning factors and plug them into ranking systems and strategies alongside traditional factors, with supporting API endpoints.
Manage module (free) provides portfolio/account tracking with real‑time quotes, multi‑account strategy tracking, stock timelines, integrated research views, and re‑imagined watchlists that chart watchlist performance vs benchmarks.

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Stock Spinoff Investing

stockspinoffinvesting.com

Research and newsletter service focused on stock spin‑offs and related special situations. Public **Upcoming** and **Completed** spin‑off calendars; paid tiers deliver monthly deep‑dive ideas, weekly updates, live Q&A calls, and a members‑only Discord. Primary focus is U.S. spin‑offs with selective international coverage.

Platforms

Web

Pricing

FreeSubscription

Quick highlights

Spin‑off Calendar: **Upcoming** table with parent/spinco, tickers, target timing, first‑trade date, and resource links; plus a **Completed** table with first‑day price, current price, and return since spin‑off.
Premium research: ~1 new idea per month with detailed write‑ups, weekly email updates, and a live monthly video Q&A.
Community: members‑only **Discord** for discussion and Q&A with the author.
PRO tier: direct access to the author (phone/email), watch‑list document, and live idea presentations.
Special situations occasionally covered (e.g., **odd‑lot** split‑off trades).

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Where they differ

Portfolio123

Distinct strengths include:

Screeners Data Visualizations Quant Portfolio Watchlist Backtesting Correlation Financials

Web‑based quant research terminal for building multifactor ranking systems, stock/ETF screens, and complete rules‑based strategies with no programming, powered by point‑in‑time FactSet data and marketed as free of survivorship and look‑ahead bias.
Supports realistic simulations and backtests over roughly 20 years of history for US, Canadian, and European equities, with custom universes, separate buy/sell rules, position sizing, hedging, and “Book of Strategies” to combine and analyze correlated systems.
Stock & ETF coverage uses fundamentals, estimates, corporate actions, plus industry/sector classification, with “over 15,000 current US, Canadian, and European stocks” and many more historical issues.
AI Factor lets users train machine‑learning factors and plug them into ranking systems and strategies alongside traditional factors, with supporting API endpoints.

Stock Spinoff Investing

Distinct strengths include:

Calendar Spin-offs Newsletters

Spin‑off Calendar: **Upcoming** table with parent/spinco, tickers, target timing, first‑trade date, and resource links; plus a **Completed** table with first‑day price, current price, and return since spin‑off.
Premium research: ~1 new idea per month with detailed write‑ups, weekly email updates, and a live monthly video Q&A.
Community: members‑only **Discord** for discussion and Q&A with the author.
PRO tier: direct access to the author (phone/email), watch‑list document, and live idea presentations.

Feature-by-feature breakdown

Attribute	Portfolio123	Stock Spinoff Investing
Categories Which research workflows each platform targets	Shared: Stock Ideas, Blogs, Videos Unique: Screeners, Data Visualizations, Quant, Portfolio, Watchlist, Backtesting, Correlation, Financials, GDP, Interest Rates, Unemployment Rates, Consumer Sentiment, Housing & Construction, Data APIs, APIs & SDKs, Broker Connectors, Education	Shared: Stock Ideas, Blogs, Videos Unique: Calendar, Spin-offs, Newsletters
Asset types Supported asset classes and universes	Stocks, ETFs, Closed-End Funds	Stocks
Experience levels Who each product is built for	Beginner, Intermediate, Advanced	Beginner, Intermediate, Advanced
Platforms Where you can access the product	Web, API, Desktop	Web
Pricing High-level pricing models	Free, Subscription	Free, Subscription
Key features Core capabilities called out by each vendor	Unique Web‑based quant research terminal for building multifactor ranking systems, stock/ETF screens, and complete rules‑based strategies with no programming, powered by point‑in‑time FactSet data and marketed as free of survivorship and look‑ahead bias. Supports realistic simulations and backtests over roughly 20 years of history for US, Canadian, and European equities, with custom universes, separate buy/sell rules, position sizing, hedging, and “Book of Strategies” to combine and analyze correlated systems. Stock & ETF coverage uses fundamentals, estimates, corporate actions, plus industry/sector classification, with “over 15,000 current US, Canadian, and European stocks” and many more historical issues. AI Factor lets users train machine‑learning factors and plug them into ranking systems and strategies alongside traditional factors, with supporting API endpoints. Manage module (free) provides portfolio/account tracking with real‑time quotes, multi‑account strategy tracking, stock timelines, integrated research views, and re‑imagined watchlists that chart watchlist performance vs benchmarks. Broker connectivity enables sending orders from Portfolio123 to linked brokerage accounts (e.g., Interactive Brokers, Tradier), syncing holdings and fills automatically while keeping assets at your existing broker.	Unique Spin‑off Calendar: Upcoming table with parent/spinco, tickers, target timing, first‑trade date, and resource links; plus a Completed table with first‑day price, current price, and return since spin‑off. Premium research: ~1 new idea per month with detailed write‑ups, weekly email updates, and a live monthly video Q&A. Community: members‑only Discord for discussion and Q&A with the author. PRO tier: direct access to the author (phone/email), watch‑list document, and live idea presentations. Special situations occasionally covered (e.g., odd‑lot split‑off trades). Coverage emphasis: primarily U.S. spin‑offs with compelling international names included as warranted.
Tested Verified by hands-on testing inside Find My Moat	Yes	Not yet
Editor pick Featured inside curated shortlists	Highlighted	Standard listing

Frequently Asked Questions

Which workflows do Portfolio123 and Stock Spinoff Investing both support?

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

Do Portfolio123 and Stock Spinoff Investing require subscriptions?

Both Portfolio123 and Stock Spinoff Investing keep freemium access with optional paid upgrades, so you can trial each platform before committing.

How can you access Portfolio123 and Stock Spinoff Investing?

Both Portfolio123 and Stock Spinoff Investing prioritize web or desktop access. Investors wanting a mobile-first workflow may need to rely on responsive web views.

What unique strengths set the two platforms apart?

Portfolio123 differentiates itself with Web‑based quant research terminal for building multifactor ranking systems, stock/ETF screens, and complete rules‑based strategies with no programming, powered by point‑in‑time FactSet data and marketed as free of survivorship and look‑ahead bias., Supports realistic simulations and backtests over roughly 20 years of history for US, Canadian, and European equities, with custom universes, separate buy/sell rules, position sizing, hedging, and “Book of Strategies” to combine and analyze correlated systems., and Stock & ETF coverage uses fundamentals, estimates, corporate actions, plus industry/sector classification, with “over 15,000 current US, Canadian, and European stocks” and many more historical issues., whereas Stock Spinoff Investing stands out for Spin‑off Calendar: **Upcoming** table with parent/spinco, tickers, target timing, first‑trade date, and resource links; plus a **Completed** table with first‑day price, current price, and return since spin‑off., Premium research: ~1 new idea per month with detailed write‑ups, weekly email updates, and a live monthly video Q&A., and Community: members‑only **Discord** for discussion and Q&A with the author..

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