VOL. XCIV, NO. 247

★ FINANCIAL TOOLS & SERVICES DIRECTORY ★

PRICE: 5 CENTS

Sunday, October 5, 2025

View marketstack View Stock Unlock Back to Home

Head-to-head

marketstack vs Stock Unlock comparison

Compare pricing, supported platforms, categories, and standout capabilities to decide which tool fits your workflow.

Quick takeaways

marketstack adds Data APIs, Splits, Interest Rates, and APIs & SDKs coverage that Stock Unlock skips.

Stock Unlock includes Screeners, Data Visualizations, Stock Comparison, ETF Overview, Portfolio, Watchlist, Insider Data, Institutional Data, Scores, Valuation Models, Analyst Forecasts, Alerts, AI, AI Report, Education, Blogs, and Newsletters categories that marketstack omits.

marketstack highlights: RESTful JSON API with secure API key access, HTTPS transport, and a 5 requests/sec global limit., End-of-day data with 15+ years of history across 500,000+ tickers, including MIC-level filtering and adjusted fields (open, close, volume)., and Intraday data for U.S. markets via IEX, with intervals from 1–60 minutes. Real-time reference prices are derived from IEX feeds; some fields require separate entitlements..

Stock Unlock is known for: Coverage of more than 130,000 stocks and ETFs across 65 global exchanges., Portfolio tracking through manual entry or broker connections (via SnapTrade integration)., and Custom watchlists with event notifications and alerts..

marketstack

marketstack.com

A global market data API with free and paid tiers. End-of-day coverage spans 15+ years and 500k+ tickers, while intraday and real-time access are unlocked on higher plans. Rate limits apply: 5 requests per second globally, with some endpoints (like ETF holdings) counting as multiple calls. Premium tiers add features like SEC/EDGAR filings, analyst ratings, and bond/index data. Data is sourced from Tiingo for U.S. markets, and uptime is tracked on a public status page.

Platforms

Web

API

Pricing

Free

Subscription

Quick highlights

RESTful JSON API with secure API key access, HTTPS transport, and a 5 requests/sec global limit.
End-of-day data with 15+ years of history across 500,000+ tickers, including MIC-level filtering and adjusted fields (open, close, volume).
Intraday data for U.S. markets via IEX, with intervals from 1–60 minutes. Real-time reference prices are derived from IEX feeds; some fields require separate entitlements.
Professional and higher tiers include real-time stock prices with minute-level updates (1 API call per minute rate cap).
Corporate actions endpoints for dividends and stock splits.

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Stock Unlock

stockunlock.com

Hands-on review

Global stock and ETF research platform with screeners, valuation tools, customizable charts, and portfolio tracking. The free plan comes with meaningful but tight limits—such as two manual portfolios, one 10-ticker watchlist, and capped screener results—while paid tiers unlock the full feature set. Billing is monthly or yearly, with a 30-day money-back guarantee.

Platforms

Web

Pricing

Free

Subscription

Quick highlights

Coverage of more than 130,000 stocks and ETFs across 65 global exchanges.
Portfolio tracking through manual entry or broker connections (via SnapTrade integration).
Custom watchlists with event notifications and alerts.
Proprietary “Insights Score” summarizing a company’s fundamentals at a glance.
Stock Screener with dozens of filters, plus the ability to compare results by Insights Score.

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Overlap

Shared focus areas

4 overlaps

Mutual strengths include Dividends, ETF Holdings, and Analyst Recommendations plus 1 more area.

Where they differ

marketstack

Distinct strengths include:

RESTful JSON API with secure API key access, HTTPS transport, and a 5 requests/sec global limit.
End-of-day data with 15+ years of history across 500,000+ tickers, including MIC-level filtering and adjusted fields (open, close, volume).
Intraday data for U.S. markets via IEX, with intervals from 1–60 minutes. Real-time reference prices are derived from IEX feeds; some fields require separate entitlements.
Professional and higher tiers include real-time stock prices with minute-level updates (1 API call per minute rate cap).

Stock Unlock

Distinct strengths include:

Coverage of more than 130,000 stocks and ETFs across 65 global exchanges.
Portfolio tracking through manual entry or broker connections (via SnapTrade integration).
Custom watchlists with event notifications and alerts.
Proprietary “Insights Score” summarizing a company’s fundamentals at a glance.

Feature-by-feature breakdown

Attribute	marketstack	Stock Unlock
Categories Which research workflows each platform targets	Shared: Dividends, ETF Holdings, Analyst Recommendations, Analyst Price Targets Unique: Data APIs, Splits, Interest Rates, APIs & SDKs	Shared: Dividends, ETF Holdings, Analyst Recommendations, Analyst Price Targets Unique: Screeners, Data Visualizations, Stock Comparison, ETF Overview, Portfolio, Watchlist, Insider Data, Institutional Data, Scores, Valuation Models, Analyst Forecasts, Alerts, AI, AI Report, Education, Blogs, Newsletters
Asset types Supported asset classes and universes	Stocks, ETFs, Bonds, Commodities	Stocks, ETFs
Experience levels Who each product is built for	Intermediate, Advanced	Beginner, Intermediate, Advanced
Platforms Where you can access the product	Web, API	Web
Pricing High-level pricing models	Free, Subscription	Free, Subscription
Key features Core capabilities called out by each vendor	Unique RESTful JSON API with secure API key access, HTTPS transport, and a 5 requests/sec global limit. End-of-day data with 15+ years of history across 500,000+ tickers, including MIC-level filtering and adjusted fields (open, close, volume). Intraday data for U.S. markets via IEX, with intervals from 1–60 minutes. Real-time reference prices are derived from IEX feeds; some fields require separate entitlements. Professional and higher tiers include real-time stock prices with minute-level updates (1 API call per minute rate cap). Corporate actions endpoints for dividends and stock splits. ETF holdings data (Basic+ plans and above) with identifiers like ISIN and CUSIP; each request consumes 20 API calls.	Unique Coverage of more than 130,000 stocks and ETFs across 65 global exchanges. Portfolio tracking through manual entry or broker connections (via SnapTrade integration). Custom watchlists with event notifications and alerts. Proprietary “Insights Score” summarizing a company’s fundamentals at a glance. Stock Screener with dozens of filters, plus the ability to compare results by Insights Score. Built-in DCF (Discounted Cash Flow) calculator for valuation work.
Tested Verified by hands-on testing inside Find My Moat	Not yet	Yes
Editor pick Featured inside curated shortlists	Standard listing	Standard listing

Frequently Asked Questions

Which workflows do marketstack and Stock Unlock both support?

Both platforms cover Dividends, ETF Holdings, Analyst Recommendations, and Analyst Price Targets workflows, so you can research those use cases in either tool before digging into the feature differences below.

Do marketstack and Stock Unlock require subscriptions?

Both marketstack and Stock Unlock keep freemium access with optional paid upgrades, so you can trial each platform before committing.

How can you access marketstack and Stock Unlock?

Both marketstack and Stock Unlock prioritize web or desktop access. Investors wanting a mobile-first workflow may need to rely on responsive web views.

What unique strengths set the two platforms apart?

marketstack differentiates itself with RESTful JSON API with secure API key access, HTTPS transport, and a 5 requests/sec global limit., End-of-day data with 15+ years of history across 500,000+ tickers, including MIC-level filtering and adjusted fields (open, close, volume)., and Intraday data for U.S. markets via IEX, with intervals from 1–60 minutes. Real-time reference prices are derived from IEX feeds; some fields require separate entitlements., whereas Stock Unlock stands out for Coverage of more than 130,000 stocks and ETFs across 65 global exchanges., Portfolio tracking through manual entry or broker connections (via SnapTrade integration)., and Custom watchlists with event notifications and alerts..

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