Portfolio123 vs Special Situation Investments (SSI) comparison

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.

Both Portfolio123 and Special Situation Investments (SSI) keep freemium access with optional paid upgrades, so you can trial each platform before committing.

Both Portfolio123 and Special Situation Investments (SSI) prioritize web or desktop access. Investors wanting a mobile-first workflow may need to rely on responsive web views.

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 Special Situation Investments (SSI) stands out for Research blog focused on event-driven trades and low-risk arbitrage opportunities with short-term catalysts., Idea library: "currently actionable" cases are restricted to members; previous opportunities are publicly viewable., and Posts typically include key fields (e.g., current price, target price/upside, expected timeline) plus a comments section for discussion..