★ BEST INVESTING TOOLS COMPARISON ★
VOL. XCIV, NO. 247
Tool comparison edition
Tool Comparison
Portfolio123 vs Reflexivity
Pick Portfolio123 if
Portfolio123
Free • From $25/mo · Web · API · Desktop
- You'd rather start free and only pay if you outgrow it
- You care about data visualizations, stock ideas, and scores, things Reflexivity doesn't offer
- You're newer to investing and want something approachable
Pick Reflexivity if
Reflexivity
Subscription · Web · API
- You care about performance attribution, scenario & stress tests, and alerts, things Portfolio123 doesn't offer
Skip both if: Neither one clicks with how you research; there are strong third options.
See alternativesOutbound links may include affiliate or sponsor codes.
Our take
The bottom line
Portfolio123 and Reflexivity cover a lot of the same ground (6 shared categories, including screeners, quant, and portfolio), so for the basics you won't go far wrong with either. Portfolio123 simply does more: 19 categories to Reflexivity's 12, including data visualizations, stock ideas, and scores. Reflexivity counters by keeping things simpler.
What readers say
Portfolio123
Vote once to reveal the community verdict.
Reflexivity
Vote once to reveal the community verdict.
Key differences at a glance
- Free plan
- Portfolio123
- Broader coverage
- Portfolio12319 vs 12 categories
- Desktop app
- Portfolio123
- Broker sync
- Portfolio123
- Beginner friendly
- Portfolio123
See for yourself
How they stack up
The side-by-side table: pricing, platforms, data, and coverage at a glance.ShowHide
How they stack up
The side-by-side table: pricing, platforms, data, and coverage at a glance.| Attribute | ||
|---|---|---|
| Pricing & plans | ||
Starting price | Free • From $25/mo | Subscription |
Free tier | Yes | No |
Free trial | — | — |
Plan limits | Free Screener & Backtesting Access: duration days: 30 | — |
| Platforms & access | ||
Web app | Yes | Yes |
Desktop app | Yes | No |
Mobile app | No | No |
API access | Yes | Yes |
Broker sync | Yes | No |
Integrations | Interactive Brokers and Tradier | — |
| Audience & fit | ||
Experience level | Beginner, Intermediate, Advanced | Intermediate, Advanced |
Best for | Retail Traders, Pro Retail +5 more | — |
Categories covered | 19 | 12 |
Regions | North America, Europe | North America, Europe, APAC, LatAm, Middle East, Africa |
| Data & capabilities | ||
Data quality | 5 signals: Latency: Real-time and End of Day, Granularity: EOD +3 more | Latency: Real-time and End of Day and Granularity: EOD |
Data partners | 4 partners: FactSet, S&P Global Market Intelligence +2 more | — |
Capabilities | 6 signals: Custom formulas, Ranking backtests +4 more | 5 signals: Universe builder, Stress tests: Rates, FX, and EquityCrash +3 more |
Security | — | SOC2 |
| Try it | Visit Portfolio123 | Visit Reflexivity |
Where each one shines
What Portfolio123 and Reflexivity each do best.ShowHide
Where each one shines
What Portfolio123 and Reflexivity each do best.What Portfolio123 does best
- Tools for building multifactor ranking systems, stock screens, ETF screens, and complete rules-based strategies through a web research environment.
- Tools for running simulations and backtests with long historical equity data, custom universes, buy and sell rules, position sizing, hedging, rebalancing, and realistic assumptions.
- Point-in-time data designed to avoid survivorship and look-ahead bias, with fundamentals, estimates, corporate actions, sector and industry classifications, and historical issues.
- Tools for creating ranking systems from fundamental, technical, sentiment, and macro factors, including public factor documentation and FRED-linked economic series.
- AI Factor to train machine-learning predictors for expected returns and feed those predictions into rankings, simulations, and asset-level analysis.
What Reflexivity does best
- AI research workflows over institutional datasets from providers such as S&P Global, LSEG Datastream, Nasdaq, Cboe, and other sources included in the platform.
- Tools for running Deep Research workflows that can analyze data, write and execute code, create research reports, and export data or visualizations.
- Search tools across filings, transcripts, presentations, central bank documents, and proprietary uploads through Document Intelligence.
- OCR on charts and tables so documents can become searchable and analyzable research inputs.
- Monitoring portfolios with real-time alerts, risk and exposure analytics, performance attribution, and daily insight generation.
Every detail we compared
Every tracked attribute for Portfolio123 and Reflexivity, side by side.ShowHide
Every detail we compared
Every tracked attribute for Portfolio123 and Reflexivity, side by side.| Attribute | ||
|---|---|---|
| Coverage & fit | ||
Asset types | StocksETFsClosed-End Funds | StocksETFsBondsCommoditiesCurrencies |
Experience | BeginnerIntermediateAdvanced | IntermediateAdvanced |
Target audience | Retail TradersPro RetailInstitutional InvestorsAnalystsQuants/DevelopersFinancial AdvisorsStudents/Researchers | Not specified |
Regions | North AmericaEurope | North AmericaEuropeAPACLatAmMiddle EastAfrica |
Coverage details | Countries: US and CAIdentifiers: Ticker | Identifiers: Ticker |
| Data | ||
Data freshness | Real-timeEnd of Day | Real-timeEnd of Day |
Data granularity | EOD | EOD |
Data partners | FactSetS&P Global Market IntelligenceICE Data ServicesFRED | Not specified |
| Access & integrations | ||
API protocols | REST | Not specified |
API auth & delivery | Auth: APIKeySDKs: PythonDocs | Not specified |
Import methods | BrokerOAuthCSV | CSVManual |
Integrations | Interactive BrokersTradier | Not specified |
Export formats | CSVJSON | Excel |
| Plans & trust | ||
Security & compliance | Not specified | SOC2 |
Capability signals | Custom formulasRanking backtestsUniverse builderBroker syncRebalancingCorrelation | Universe builderStress tests: Rates, FX, and EquityCrashPortfolio attributionCitation pinningAI summaries: Filings, Transcripts, and News |
Vendor & support | Portfolio123Support: Forum | Knabble, Inc. (dba Reflexivity)Country: United StatesSupport: Email |
Green tags are exclusive to that tool in this comparison.
What you'll actually pay
Plans, billing, trials, and per-month pricing for both tools.ShowHide
What you'll actually pay
Plans, billing, trials, and per-month pricing for both tools.| Tier | ||
|---|---|---|
| Free plan | Free“Manage (Free)” | — |
| Entry paid plan | $25/mo“Retail Research Plans” | — |
| Custom / enterprise | Contact sales“Professional / API & Data Licenses” | — |
Questions we keep getting
What's the difference between Portfolio123 and Reflexivity?
Portfolio123 leans toward screeners, data visualizations, and quant, while Reflexivity puts more weight on screeners, quant, and performance attribution. They overlap in 6 categories, so for most people it comes down to workflow preference and price.
Is Portfolio123 or Reflexivity free to use?
Portfolio123 has a free tier, so you can get started without paying anything. Reflexivity is paid-only. If budget matters, start with Portfolio123 and see how far it takes you before opening your wallet.
Which is better for beginners: Portfolio123 or Reflexivity?
Portfolio123 is the friendlier place to start; its interface takes less getting used to. Both work fine once you're past the basics.
Do Portfolio123 and Reflexivity have APIs?
Yes, both offer API access, so developers and quants can pull data programmatically or wire up their own integrations.
Should I choose Portfolio123 or Reflexivity?
It depends on what you're after. Pick Portfolio123 if data visualizations and stock ideas matter to you; go with Reflexivity if you'd rather have performance attribution and scenario & stress tests. And if you only need the basics both share, let price decide.
What asset classes do Portfolio123 and Reflexivity cover?
Both cover stocks and ETFs. Portfolio123 also handles closed-end funds. Reflexivity adds bonds, commodities, and currencies on top.
Do Portfolio123 and Reflexivity offer real-time data?
Yes, both serve real-time market data, so either works when timing matters.
Can I export data from Portfolio123 and Reflexivity?
Yes, both export to spreadsheets (Portfolio123: CSV; Reflexivity: Excel), which is handy if you like running your own numbers.
Can Portfolio123 or Reflexivity connect to my broker?
Portfolio123 syncs with brokers automatically. With Reflexivity, you're entering holdings by hand or importing files.
Which has a better stock screener: Portfolio123 or Reflexivity?
Both Portfolio123 and Reflexivity include stock screeners, and they differ more in interface than raw power; try both and see which one clicks for you.
Can I track my portfolio with Portfolio123 or Reflexivity?
Yes, both do portfolio tracking: holdings, performance, and allocation in one place.
Keep researching
More comparisons to check
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Feedback
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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.