Portfolio123
Quantitative stock screening and portfolio backtesting for systematic investors
Our Verdict
Portfolio123 is the most powerful quantitative screening and backtesting platform available to retail investors. Powered by institutional-grade FactSet data with 20 years of point-in-time history, it delivers analytical depth that no consumer alternative matches — if you are willing to invest the time to learn it.
Best for: Systematic investors who want quantitative factor-based portfolio construction without coding
Our Experience
Portfolio123 in Action
Who Should Use Portfolio123
Portfolio123 is built for self-directed investors who want to take a systematic, data-driven approach to stock selection. If you are interested in building multi-factor ranking systems, screening across hundreds of fundamental and technical metrics, and backtesting strategies against decades of point-in-time data, this platform delivers at a level no consumer alternative matches. Dividend investors and growth-oriented stock pickers benefit especially from the factor library and pre-built screens. Portfolio managers, RIAs, and academic researchers will find institutional-grade FactSet data at a fraction of terminal costs. The platform suits anyone who wants the rigor of quantitative investing without the programming requirements of tools like QuantConnect.
Who Should Avoid Portfolio123
Day traders and momentum scalpers will find little value here — Portfolio123 is designed for holding periods measured in weeks to years, not minutes. Complete beginners may be overwhelmed by the sheer depth of the screening and ranking tools; simpler platforms like Finviz or Stock Rover offer a gentler entry point. If you need mobile access, Portfolio123 has no iOS or Android app. Those who rely on integrated news feeds, social sentiment, or community discussion will need to look elsewhere — the platform is laser-focused on quantitative tools and deliberately excludes social features. Investors focused primarily on options, futures, or crypto will also find no coverage here.
What is Portfolio123?
Portfolio123 is a quantitative investing platform powered by institutional-grade FactSet data that lets you screen stocks using 460+ fundamental and technical factors, backtest multi-factor strategies over 20+ years of point-in-time data, and execute trades through integrated brokers. Used by systematic investors, portfolio managers, and academic researchers who want data-driven portfolio construction without writing code.
Key Strengths
Portfolio123 is powered by FactSet — the same data provider used by hedge funds and investment banks. All data is point-in-time, meaning backtests reflect only what was actually known on each historical date, with no survivorship or look-ahead bias. This level of data integrity is virtually unmatched among retail-accessible platforms and is the foundation on which every other feature rests.
The backtesting engine is the platform's crown jewel. You can test strategies across 20 years of historical data, apply realistic slippage and commission assumptions, run rolling screens for walk-forward analysis, and simulate complete portfolios with buy and sell rules, position sizing, and hedging. Multiple reviewers have called it the best backtesting service for people serious about testing fundamental strategies.
Portfolio123 provides 64 pre-built ranking systems spanning value, growth, quality, momentum, and composite approaches — plus a builder that lets you construct custom ranking systems using spreadsheet-like formulas. No programming is required. Each ranking system can be backtested, compared, and combined into multi-strategy books, making quantitative factor investing accessible without coding skills.
Unlike most screening and backtesting platforms, Portfolio123 connects directly to Interactive Brokers and Tradier for live trade execution. Tradier integration offers commission-free stock and ETF trading. The platform supports single-click rebalancing, order scheduling, and ATR-based order limits — transforming it from a research tool into an end-to-end portfolio management system.
Key Weaknesses
Portfolio123 is not intuitive for newcomers. The interface is dense, the terminology is specialized, and building effective ranking systems requires understanding quantitative concepts like factor construction, universe selection, and out-of-sample testing. Community members consistently advise new users to start with pre-built screens and designer models before attempting custom strategies. The initial barrier is real and can take weeks to overcome.
The platform is entirely web-based with no iOS or Android application. The desktop interface, while functional, looks dated compared to modern fintech tools. Charting capabilities are limited and lack the polish of dedicated platforms like TradingView. There is no integrated news feed, no social features, and no real-time streaming data.
Portfolio123 covers only stocks and ETFs across US, Canadian, and European markets. There is no support for options, futures, forex, or cryptocurrency. European coverage — while recently expanded — requires a supplemental subscription at roughly 40% of the base plan cost, making full geographic coverage meaningfully more expensive.
What Users Say
Key Features
Portfolio123 Pricing
Free
- ✓ Broker integration (Tradier/IB)
- ✓ Fundamental charting
- ✓ Earnings calendar
- ✓ Consolidated brokerage view
Screener
- ✓ Full financial database
- ✓ 460+ screening metrics
- ✓ 5 years backtest data
- ✓ Pre-built screeners
- ✓ Stock & ETF screening
Pro
- ✓ All Screener features
- ✓ 20 years backtest data
- ✓ Multi-factor ranking systems
- ✓ Rolling screens
- ✓ Position sizing
- ✓ Strategy API
- ✓ AI factor development
Integrations
Getting Started
Getting started with Portfolio123 takes about ten minutes. Create a free account on portfolio123.com — no credit card is required. The free tier provides immediate access to fundamental charting, an earnings calendar, and broker linking. To explore the full screening and backtesting capabilities, start the 21-day trial for $19. Once inside, navigate to the Screener section and explore the 76-plus pre-built screens — the All-Stars category shows ten-year simulated performance for each screen. Try the ranking system builder to see how multi-factor scores work. To connect a brokerage, go to the Linked Accounts section and authorize Interactive Brokers or Tradier. Portfolio123 supports single-click rebalancing and order scheduling once linked. Join the community forum at community.portfolio123.com — members are notably constructive and share strategies, lessons, and ranking system templates.
Pricing Analysis
Portfolio123's pricing is straightforward and competitive for the depth of tooling it provides. The free tier includes broker integration with Tradier and Interactive Brokers, fundamental charting, and a consolidated brokerage account view — useful but limited for research. The Screener plan at $25/month unlocks the full financial database, 460-plus screening metrics, and five years of backtesting data. The Pro plan at $83/month adds 20 years of backtesting, multi-factor ranking systems, rolling screens, position sizing, and API access. Annual billing saves 28% on Retail plans and 23% on Pro plans. A 21-day trial at $19 provides full Pro-level access with 10 years of data and no auto-renewal — a low-risk way to evaluate the platform. For context, Stock Rover Premium Plus costs $28/month with shallower backtesting, while Trade Ideas starts at $118/month for a narrower use case.
How Portfolio123 Compares
Portfolio123 occupies a distinct niche between consumer stock screeners and professional quant platforms. Stock Rover ($0-28/month) offers more screening filters (575+) and a friendlier interface but cannot match Portfolio123's backtesting depth or FactSet data quality. Finviz ($0-40/month) excels at visual stock scanning and heat maps but offers only 67 fundamental criteria and no backtesting engine. QuantConnect provides comparable analytical depth and supports multiple asset classes, but requires writing code in C# or Python — a non-starter for non-programmers. Trade Ideas ($118-228/month) targets day traders with AI-powered real-time scanning, a fundamentally different use case. Where Portfolio123 wins is the combination of institutional-grade data, deep backtesting, and no-code factor modeling in a single platform — a capability set no direct competitor replicates at its price point.
The Bottom Line
Portfolio123 is the most powerful quantitative screening and backtesting platform available to retail investors. Its combination of institutional-grade FactSet data, 20-year point-in-time backtesting, multi-factor ranking systems, and commission-free broker integration creates genuine analytical depth that no consumer alternative matches. The learning curve is steep and the interface is dated, but for systematic investors willing to invest the time, no other platform delivers this level of quantitative rigor at $25-83/month.
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