Portfolio123

Multi-Tool Platform — Freemium

Quant workbench for ranking systems, point-in-time backtests and machine-learning stock predictors.

AI Factor trains ML predictors inside your ranking system

Overview

Portfolio123 has been the retail quant's workshop since 2004. You build multi-factor ranking systems, screen stocks and ETFs, backtest rules on point-in-time data and then run the strategy with orders sent to your broker. It covers the US, Canada and Europe with 20 years of test data. The crowd is serious: systematic investors who would rather test an idea than argue about it.

The AI piece is called AI Factor. You pick features, train machine-learning predictors on historical data and get forecasts of relative returns. Those predictions plug straight into ranking systems and simulations, so a model can be tested the same way as any hand-built rule. No code is required, though you need to understand overfitting to use it well.

The catch: this is not a beginner product and not cheap. Third-party listings put the screener tier near $35 a month and full access well into three figures. A 30-day free look at the screener and backtester needs no card. A backtest is a hypothesis, not a promise. Skip it if you want picks handed to you. Use it if you want to build and test your own system.

Pros

• Point-in-time data limits backtest bias
• No-code machine-learning ranking models
• Sends orders to connected brokers

Cons

• Steep learning curve for new users
• Higher tiers cost over $100 a month

Is Portfolio123 Legit? FAQ

Is Portfolio123 legit?

Portfolio123 is a real, working product with a public track record you can check: 51 reviews on Trustpilot, averaging 4.8 out of 5. We list it because it has a real AI feature, not because it paid us. The biggest drawback we found: Steep learning curve for new users.

How much does Portfolio123 cost?

Portfolio123 is listed at Free trial / $35/mo. There is a free tier, with paid plans above it. Prices change, so confirm on the official site before you pay.

Does Portfolio123 have a free trial?

Yes. Portfolio123 offers a free trial, so you can test it before paying.

Does Portfolio123 have an API or MCP server?

Portfolio123 offers an API or webhooks you can connect to your own code or trading bot. We found no MCP server for AI assistants.