★ BEST INVESTING TOOLS COMPARISON ★
VOL. XCIV, NO. 247
Tool details checked August 23, 2026
Tool Comparison
Reflexivity vs Testfol.io
Pick Reflexivity if
Reflexivity
Free • From $99.99/mo · Web · API
- Delayed quotes won't cut it; you need real-time data
- You want an API so you can script or automate things
- You care about screeners, performance attribution, and scenario & stress tests, things Testfol.io doesn't offer
Pick Testfol.io if
Testfol.io
Free • From $15/mo · Web
- You want the cheaper way in: plans start at $15/mo instead of $99.99/mo
- You care about correlation, risk metrics, and compounding calculator, things Reflexivity doesn't offer
- You're a long-term investor who cares more about fundamentals than headlines
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
Reflexivity and Testfol.io cover a lot of the same ground (2 shared categories, quant and backtesting), so for the basics you won't go far wrong with either. Reflexivity simply does more: 13 categories to Testfol.io's 5, including screeners, performance attribution, and scenario & stress tests. Testfol.io counters by starting cheaper at $15/mo.
What readers say
Reflexivity
No votes yet. Cast the first one.
Testfol.io
No votes yet. Cast the first one.
Key differences at a glance
- Cheaper paid plan
- Testfol.io$15/mo vs $99.99/mo
- Free trial
- Testfol.io1 days
- Broader coverage
- Reflexivity13 vs 5 categories
- API access
- Reflexivity
- Real-time data
- Reflexivity
- Free plan
- Both
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 $99.99/mo | Free • From $15/mo |
Free tier | Yes | Yes |
Free trial | — | 1 days |
Plan limits | — | 5 limits: Free (Anonymous): note: Some tools (e.g., Signal Analyzer) require sign-in., Pro: annual price usd: 150 +3 more |
| Platforms & access | ||
Web app | Yes | Yes |
Mobile app | No | No |
API access | Yes | No |
Broker sync | No | — |
| Audience & fit | ||
Experience level | Intermediate, Advanced | Intermediate, Advanced |
Best for | — | Retail Traders, Pro Retail +2 more |
Categories covered | 13 | 5 |
Regions | North America, Europe, APAC, LatAm, Middle East, Africa | — |
| Data & capabilities | ||
Data quality | Latency: Real-time and End of Day and Granularity: EOD | Latency: End of Day and Granularity: EOD |
Data partners | — | FRED |
Capabilities | 5 signals: Universe builder, Stress tests: Rates, FX, and EquityCrash +3 more | Rebalancing and Correlation |
Security | SOC2 | — |
| Try it | Visit Reflexivity | Visit Testfol.io |
Where each one shines
What Reflexivity and Testfol.io each do best.ShowHide
Where each one shines
What Reflexivity and Testfol.io each do best.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 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.
- Monitor portfolios with real-time alerts, risk and exposure analytics, performance attribution, and daily insight generation.
What Testfol.io does best
- Tools for building multi-asset portfolio backtests using ETFs, mutual funds, stocks, cashflow legs, and rebalancing controls such as rebalance bands.
- Review performance and risk statistics such as cumulative return, CAGR, money-weighted return, max drawdown, volatility, Sharpe, Sortino, and beta.
- Asset Analyzer for historical performance analysis and daily-return correlations.
- Testing tools for tactical allocation rules that swap between allocations using documented indicators, trading frequency, offsets, cashflows, benchmarks, and current-status views.
- Portfolio Optimizer searches for asset allocation and use choices based on user-provided inputs.
Every detail we compared
Every tracked attribute for Reflexivity and Testfol.io, side by side.ShowHide
Every detail we compared
Every tracked attribute for Reflexivity and Testfol.io, side by side.| Attribute | ||
|---|---|---|
| Coverage & fit | ||
Asset types | StocksETFsBondsCommoditiesCurrencies | StocksETFsMutual Funds |
Experience | IntermediateAdvanced | IntermediateAdvanced |
Target audience | Not specified | Retail TradersPro RetailLong-term InvestorsQuants/Developers |
Regions | North AmericaEuropeAPACLatAmMiddle EastAfrica | Not specified |
Coverage details | Identifiers: Ticker | Identifiers: Ticker |
| Data | ||
Data freshness | Real-timeEnd of Day | End of Day |
Data granularity | EOD | EOD |
Data partners | Not specified | FRED |
| Access & integrations | ||
Import methods | CSVManual | Not specified |
Export formats | Excel | CSV |
| Plans & trust | ||
Security & compliance | SOC2 | Not specified |
Capability signals | Universe builderStress tests: Rates, FX, and EquityCrashPortfolio attributionCitation pinningAI summaries: Filings, Transcripts, and News | RebalancingCorrelation |
Vendor & support | Knabble, Inc. (dba Reflexivity)Country: United StatesSupport: Email | Support: 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“Basic via IBKR” | Free“Free (Anonymous)”note: Some tools (e.g., Signal Analyzer) require sign-in. |
| Entry paid plan | $99.99/mo“Plus via IBKR” | $15/mo“Pro”annual price usd: 150 · annual monthly equivalent usd: 12.5 |
| Top plan | — | $30/mo“Pro+”annual price usd: 300 · annual monthly equivalent usd: 25 |
| Custom / enterprise | Contact sales“Institutional” | — |
| Free trial | — | 1 days |
Questions we keep getting
What's the difference between Reflexivity and Testfol.io?
Reflexivity leans toward screeners, quant, and performance attribution, while Testfol.io puts more weight on backtesting, correlation, and risk metrics. They overlap in 2 categories, so for most people it comes down to workflow preference and price.
How much do Reflexivity and Testfol.io cost?
Good news: both Reflexivity and Testfol.io have free plans, so you can run them side by side and only pay if you hit a wall.
Does Reflexivity or Testfol.io have an API?
Reflexivity has an API for programmatic access and custom integrations. Testfol.io doesn't, so you're working through its interface.
Should I choose Reflexivity or Testfol.io?
It depends on what you're after. Pick Reflexivity if screeners and performance attribution matter to you; go with Testfol.io if you'd rather have correlation and risk metrics. And if you only need the basics both share, let price decide.
What asset classes do Reflexivity and Testfol.io cover?
Both cover stocks and ETFs. Reflexivity also handles bonds, commodities, and currencies. Testfol.io adds mutual funds on top.
Does Reflexivity or Testfol.io have real-time data?
Reflexivity offers real-time data, which matters if you trade actively. Testfol.io runs on delayed or end-of-day data, which is perfectly fine for longer-term investors who don't live and die by the tick.
Can I export data from Reflexivity and Testfol.io?
Yes, both export to spreadsheets (Reflexivity: Excel; Testfol.io: CSV), which is handy if you like running your own numbers.
Which has a better stock screener: Reflexivity or Testfol.io?
Reflexivity has a stock screener for surfacing ideas; Testfol.io doesn't, and focuses its energy elsewhere.
Can I track my portfolio with Reflexivity or Testfol.io?
Reflexivity handles portfolio tracking. Testfol.io is really a research tool; you'd track your portfolio elsewhere.
Keep researching
More comparisons to check
Other tools you might like
Keep Exploring
Feedback
Spot stale pricing, missing features, or a comparison that feels off? Send feedback on the verdict, table, alternatives, or recommendation.
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.