Best Free Tools for Quants/Developers

Calcbench

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Calcbench is a professional SEC filing, XBRL, financial statement, disclosure, and Excel research platform for analysts who need traceable as-filed numbers, standardized accounting metrics, footnotes, redlines, proxy data, compensation data, M&A details, and API access. It is strongest for accounting-heavy U.S. equity research and data workflows, but meaningful access is priced for professional users and API access is sold separately from standard subscriptions.

Changeflow (Trackly)

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Changeflow, formerly reached through Trackly, is an AI website-change intelligence platform for monitoring filings, regulator pages, IR pages, competitor pages, PDFs, feeds, and other online sources. It is useful for investment and compliance teams that want relevant briefings rather than raw page diffs, but it is not market data, trade execution, or a substitute for human review.

CME FedWatch

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CME FedWatch is the widely used CME Group tool for tracking market-implied probabilities of Federal Reserve target-rate outcomes for upcoming FOMC meetings, derived from 30-Day Fed Funds futures. It is strongest for macro investors, rates teams, journalists, and dashboards monitoring Fed-rate expectations, with a free web tool plus paid EOD and intraday API options, but probabilities are market-implied estimates, not Fed guidance or investment advice.

Dune

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Dune is a crypto and onchain analytics platform for SQL dashboards, decoded blockchain data, APIs, alerts, uploads, teams, and AI-agent workflows. It is useful when you want to build or automate custom onchain analysis across many blockchains rather than consume a fixed market-data screen.

ECB Data Portal

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ECB Data Portal is the official free European Central Bank source for ECB statistics, euro area macro data, interest rates, exchange rates, yield curves, downloads, charts, and SDMX API access. It is useful when you need primary-source European macro data rather than a commercial terminal summary.

EDINET

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EDINET is Japan's official electronic corporate-disclosure system. It supports issuer, security, fund, stock-code, document-type, keyword, and date searches, with source filings, XBRL resources, taxonomy files, and an API for programmatic filing retrieval.

EIA Open Data

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EIA Open Data is the U.S. government source for statistical and operational energy data. Analysts and developers can browse energy series or retrieve them through a free API, bulk files, and spreadsheet tools for macro, commodity, utility, and energy-market research.

European Central Bank (ECB) — Statistics & Data

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European Central Bank Statistics & Data is the official ECB source for euro-area statistics, policy rates, FX reference rates, yield curves, inflation, macro indicators, downloads, and SDMX API access. It is useful when you need primary-source European macro and rates data rather than investment-app commentary.

FactorsToday

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FactorsToday is a quantitative factor-investing platform with dashboards, screeners, portfolio factor analysis, attribution, hedge construction, factor portfolio building, downloads, and an open REST API. It is useful when you need factor exposure workflows without building every model and endpoint yourself.

Financial Modeling Prep (FMP)

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Financial Modeling Prep (FMP) is a market-data API and spreadsheet-data provider for developers, analysts, quants, and product builders who need equities, ETFs, funds, FX, crypto, commodities, macro, ESG, ownership, news, calendars, transcripts, and fundamentals from one vendor. It is strongest when you want REST and WebSocket access plus Excel and Google Sheets add-ins at a lower entry price than enterprise terminals. The main buying questions are plan limits, geography, history depth, and dataset access: the free Basic tier is a limited EOD sandbox, while real-time, global, transcript, 13F, holdings, intraday, and bulk workflows require paid tiers.

FinancialData.Net

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FinancialData.Net is an API-first financial data platform for developers, analysts, spreadsheet users, and AI-agent builders who want broad market data, fundamentals, ownership, options, funds, ESG, calendars, news, Excel access, and MCP connectivity from one provider. It is strongest when breadth matters: stocks, ETFs, mutual funds, options, futures, crypto, forex, commodities, OTC securities, indices, filings-related datasets, and institutional/insider activity can sit behind one REST API. Serious use is paid, and compliance/security claims should be verified directly because no public audit reports were identified.

Finatic

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Finatic is a broker-connectivity API for fintech builders who need user brokerage linking, normalized brokerage account data, webhooks, and consented trade execution across many brokers. It is useful infrastructure for portfolio apps, trading journals, automation products, copy-trading workflows, and AI/data systems, but it should be evaluated as an early-stage provider with meaningful security, compliance, and broker-specific permission due diligence.

FRED (Federal Reserve Economic Data)

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FRED (Federal Reserve Economic Data) is the free macroeconomic time-series database from the Federal Reserve Bank of St. Louis, used by students, investors, analysts, quants, and product builders who need trusted economic data, charts, release calendars, Excel access, mobile apps, and a REST API. It is strongest for official macro context around inflation, rates, GDP, employment, exchange rates, credit, and market indicators rather than equity fundamentals or brokerage workflows. API users need a free API key, and usage remains subject to FRED terms and source-specific data restrictions.

FXMacroData

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FXMacroData is a real-time macroeconomic and central-bank data API for FX traders, quants, developers, and analysts who need timestamped releases, rates, yields, calendars, COT data, FX spot data, dashboards, MCP tools, embeddable charts, and exports. It is strongest when macro release timing and point-in-time history matter for backtests, dashboards, or live FX workflows. Free access is evaluation-oriented, full history and non-USD data are paid, Individual and Startup trials require a credit card, and redistribution rights are plan-gated.

Glassnode

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Glassnode is a digital-asset analytics platform for investors, analysts, quants, and institutions that need on-chain metrics, crypto market data, derivatives data, ETF data, alerts, research, workbench charts, exports, and API delivery. It is strongest when crypto-native data matters: wallet behavior, entity-adjusted metrics, point-in-time series, futures/options context, and institutional delivery options go beyond a general price chart. The main constraint is access gating: Studio Standard and Advanced are display-oriented, exports are Professional-only, and API or Excel workflows require Professional plus an API add-on and data credits.

Global Factor Data (JKP Factors)

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Global Factor Data, often called JKP Factors, is a free academic research dataset and web interface for global equity factor returns, stock characteristics, and reproducible factor-construction code based on Jensen, Kelly, and Pedersen. It is best for quants, researchers, students, and factor-investing teams that need transparent evidence on global factor performance rather than marketing claims. The data is not a live trading feed, and the license is non-commercial unless separate permission is granted.

Marketstack

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Marketstack is an APILayer REST market-data API for developers who need stock prices, end-of-day history, intraday bars, corporate actions, reference data, ETF holdings, bond yields, commodities, analyst ratings, and SEC EDGAR company datasets through JSON endpoints. It is useful for prototypes and products that need a simple stock market API with a free tier and clear paid plans. It is not a charting app, broker, portfolio tracker, screener UI, or unlimited institutional data license.

MesoSim

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MesoSim is an options strategy backtesting platform for traders who need low-code strategy definitions, multi-leg simulations, risk graphs, Greeks, volatility surfaces, margin models, and paper/live workflow paths. It is narrow by design: options research first, not broad stock research or portfolio accounting.

OpenBB

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OpenBB combines an open-source financial data layer with a hosted Workspace for dashboards, AI research, custom agents, and team workflows. It is best for analysts, quants, developers, and firms that want to connect their own market data, internal datasets, provider API keys, widgets, MCP tools, and AI workflows instead of buying a closed terminal. Community access is useful for individuals, while Pro adds collaboration, exports, Excel, RBAC, SSO, MFA, and private deployment options. OpenBB does not provide production market data itself; it orchestrates connectors, your data, and your vendor access.

OTC Markets

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OTC Markets combines a public research website for U.S. OTC-traded securities with licensed market-data, disclosure, and feed products for professional users. It is useful for OTC issuer pages, tiers, quotes, news, filings, screeners, and Level 1/Level 2 data workflows, but it is not a full global equity terminal, broker, or free redistribution source.

PortfoliosLab

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PortfoliosLab is a web-based portfolio analytics platform for backtesting, optimization, risk metrics, correlations, screeners, and AI-assisted portfolio workflows. It is useful for comparing stocks, ETFs, funds, crypto, and model portfolios, with more history, imports, exports, and MCP access gated by paid tiers.

rotki

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rotki is a privacy-focused portfolio tracker and accounting tool that runs on the user's own machine. It combines exchange and blockchain activity, decodes on-chain events, tracks balances and history, and produces configurable profit-and-loss and tax reports without requiring transaction history to live in a hosted tax service.

SentiSense

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SentiSense is a beta AI market-intelligence and data API platform for investors and developers who want stock data, sentiment, news clustering, social signals, institutional flows, insider trades, congressional trading disclosures, and AI-generated insights in one workflow. It serves as a signal layer for research, not as a broker or adviser.

StockInsights.ai

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StockInsights.ai is an AI equity research assistant for filings, earnings calls, transcript summaries, 8-K categorization, SEC filing dashboards, watchlist alerts, APIs, and custom research workflows. It is useful for AI-assisted public-company monitoring, but API commercial use, redistribution, higher limits, and custom workflows require separate plans or contact.

Testfol.io

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Testfol.io is a freemium web-based portfolio backtesting and analysis toolkit for investors who want to test allocations, cashflows, rebalancing rules, tactical signals, leverage, correlations, and historical risk/return. It is strongest for portfolio-level experimentation rather than intraday monitoring or live account management. Anonymous and free-account use remain available, while Pro and Pro+ unlock advanced analytics, higher limits, uploads, downloads, alerts, and cloud workflows. Backtests depend on historical assumptions and end-of-day data, so they are not trade execution or forward-looking guarantees.

TickerTrends

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TickerTrends is an alternative-data and KPI-forecasting platform for public-company investors, analysts, quant teams, hedge funds, and institutions. It combines search, web traffic, app usage, social, reviews, news, transcripts, financial data, consensus, and proprietary trend signals, but those signals are noisy proxies that require validation before investment use.

Trading Economics

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Trading Economics is a macro and markets data platform for browsing economic indicators, calendars, forecasts, market data, company financials, news, ratings, and corporate events, with paid REST API, WebSocket, spreadsheet, BI, and AI-assistant integrations. It is strongest for developers, analysts, and teams building dashboards, alerts, research apps, and macro data pipelines from one source. Guest credentials provide limited sample access, while Standard, Professional, and Enterprise plans govern real API use, streaming, rate limits, row limits, and commercial rights. It is data infrastructure, not a broker or investment-advice service.

U.S. Bureau of Economic Analysis (BEA)

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The U.S. Bureau of Economic Analysis is the official free source for U.S. economic accounts, including GDP, personal income, PCE inflation, industry data, international accounts, regional data, interactive tables, release calendars, downloads, and a developer API. It is strongest for macro dashboards, valuation assumptions, economic research, and data workflows that need primary-source U.S. government data, but it updates on statistical release schedules and API use requires a free UserID.

U.S. Bureau of Labor Statistics (BLS)

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The U.S. Bureau of Labor Statistics is the official free source for U.S. labor-market, inflation, wage, productivity, price, employment, unemployment, and occupational statistics. It is strongest for macro dashboards, CPI and jobs-report monitoring, research models, release calendars, bulk downloads, and Public Data API workflows, but BLS data updates on official statistical schedules and programmatic use requires comfort with survey structures and series IDs.

Validea

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Validea is a factor and guru-strategy research site with stock and ETF model portfolios, guru analysis, factor reports, stock and ETF screeners, trend following, market valuation, portfolio correlation, strategy/ETF matching, alerts, videos, and newsletters. It is useful for systematic idea generation, but model returns are not actual trading results and paid plan pricing is not cleanly published on the reviewed pages.