VOL. XCIV, NO. 247

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Sunday, October 19, 2025

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Head-to-head

Ahrefs vs SEC API (sec-api.io) comparison

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

Quick takeaways

Ahrefs adds App & Website Traffic coverage that SEC API (sec-api.io) skips.

SEC API (sec-api.io) includes Data APIs, Regulatory Filings Monitoring, Insider Data, 13F, 13D/13G, Financials, Management Compensation, and IPO categories that Ahrefs omits.

Ahrefs highlights: Comprehensive toolkit: Site Explorer, Keywords Explorer, Site Audit, Rank Tracker, Content Explorer, and Web Analytics., Ahrefs Webmaster Tools (free) provides a lighter version of Site Explorer and Site Audit, plus Web Analytics for verified sites., and Looker Studio connectors available for Site Explorer, Rank Tracker, and Site Audit — reserved for Advanced and above..

SEC API (sec-api.io) is known for: Comprehensive API endpoints: query, full-text search, real-time streaming via WebSocket, download/PDF generator, XBRL-to-JSON conversion, and section extractors for 10-K/10-Q/8-K filings., Specialized form coverage including ADV, insider filings (Forms 3/4/5), 13F, 13D/G, Form 144, IPO registrations (S-1, 424B4), crowdfunding (Form C, Form D), Reg A filings, and fund reports (N-PORT, N-PX, N-CEN)., and Datasets include executive compensation, directors and board members, audit fees, subsidiaries, and public float/outstanding shares..

Ahrefs

ahrefs.com

Hands-on review

A leading SEO and web-traffic intelligence suite. The free Ahrefs Webmaster Tools unlocks limited access to Site Explorer, Site Audit, and Web Analytics for verified sites, while full platform plans expand into deep backlink, keyword, and content analysis. Higher-tier subscriptions govern credits, export limits, historical data windows, and API access.

Platforms

Web

API

Pricing

Free

Subscription

Quick highlights

Comprehensive toolkit: Site Explorer, Keywords Explorer, Site Audit, Rank Tracker, Content Explorer, and Web Analytics.
Ahrefs Webmaster Tools (free) provides a lighter version of Site Explorer and Site Audit, plus Web Analytics for verified sites.
Looker Studio connectors available for Site Explorer, Rank Tracker, and Site Audit — reserved for Advanced and above.
Automated email alerts for new or lost backlinks, keyword changes, and web mentions, with flexible delivery options.
API v3 is included with Enterprise plans (with limited test queries available to all users).

Community votes (overall)

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SEC API (sec-api.io)

sec-api.io

Editor’s pick Hands-on review

A commercial API suite for SEC/EDGAR data, designed for developers, quants, and compliance teams. The free tier includes 100 calls per month. Paid tiers unlock higher rate limits, more data (5 GB vs 15 GB monthly, with $0.30/GB overage), and features such as multiple API keys or redistribution rights for enterprise users. The platform emphasizes speed, with new filings typically available in under 300 ms.

Platforms

Web

API

Pricing

Free

Subscription

Quick highlights

Comprehensive API endpoints: query, full-text search, real-time streaming via WebSocket, download/PDF generator, XBRL-to-JSON conversion, and section extractors for 10-K/10-Q/8-K filings.
Specialized form coverage including ADV, insider filings (Forms 3/4/5), 13F, 13D/G, Form 144, IPO registrations (S-1, 424B4), crowdfunding (Form C, Form D), Reg A filings, and fund reports (N-PORT, N-PX, N-CEN).
Datasets include executive compensation, directors and board members, audit fees, subsidiaries, and public float/outstanding shares.
Historical coverage back to 1993 with support for all 400+ EDGAR form types; new filings made available within ~300 ms of posting.
Live filing feeds available in real time via WebSocket for instant integration.

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Overlap

Shared focus areas

1 overlap

Both tools cover this research theme.

APIs & SDKs

Where they differ

Ahrefs

Distinct strengths include:

App & Website Traffic

Comprehensive toolkit: Site Explorer, Keywords Explorer, Site Audit, Rank Tracker, Content Explorer, and Web Analytics.
Ahrefs Webmaster Tools (free) provides a lighter version of Site Explorer and Site Audit, plus Web Analytics for verified sites.
Looker Studio connectors available for Site Explorer, Rank Tracker, and Site Audit — reserved for Advanced and above.
Automated email alerts for new or lost backlinks, keyword changes, and web mentions, with flexible delivery options.

SEC API (sec-api.io)

Distinct strengths include:

Data APIs

Regulatory Filings Monitoring

Management Compensation

IPO

Comprehensive API endpoints: query, full-text search, real-time streaming via WebSocket, download/PDF generator, XBRL-to-JSON conversion, and section extractors for 10-K/10-Q/8-K filings.
Specialized form coverage including ADV, insider filings (Forms 3/4/5), 13F, 13D/G, Form 144, IPO registrations (S-1, 424B4), crowdfunding (Form C, Form D), Reg A filings, and fund reports (N-PORT, N-PX, N-CEN).
Datasets include executive compensation, directors and board members, audit fees, subsidiaries, and public float/outstanding shares.
Historical coverage back to 1993 with support for all 400+ EDGAR form types; new filings made available within ~300 ms of posting.

Feature-by-feature breakdown

Attribute	Ahrefs	SEC API (sec-api.io)
Categories Which research workflows each platform targets	Shared: APIs & SDKs Unique: App & Website Traffic	Shared: APIs & SDKs Unique: Data APIs, Regulatory Filings Monitoring, Insider Data, 13F, 13D/13G, Financials, Management Compensation, IPO
Asset types Supported asset classes and universes	Other	Stocks, ETFs, Mutual Funds, Funds
Experience levels Who each product is built for	Beginner, Intermediate, Advanced	Beginner, Intermediate, Advanced
Platforms Where you can access the product	Web, API	Web, API
Pricing High-level pricing models	Free, Subscription	Free, Subscription
Key features Core capabilities called out by each vendor	Unique Comprehensive toolkit: Site Explorer, Keywords Explorer, Site Audit, Rank Tracker, Content Explorer, and Web Analytics. Ahrefs Webmaster Tools (free) provides a lighter version of Site Explorer and Site Audit, plus Web Analytics for verified sites. Looker Studio connectors available for Site Explorer, Rank Tracker, and Site Audit — reserved for Advanced and above. Automated email alerts for new or lost backlinks, keyword changes, and web mentions, with flexible delivery options. API v3 is included with Enterprise plans (with limited test queries available to all users). Enterprise also adds SSO, two-factor authentication, and higher data allowances.	Unique Comprehensive API endpoints: query, full-text search, real-time streaming via WebSocket, download/PDF generator, XBRL-to-JSON conversion, and section extractors for 10-K/10-Q/8-K filings. Specialized form coverage including ADV, insider filings (Forms 3/4/5), 13F, 13D/G, Form 144, IPO registrations (S-1, 424B4), crowdfunding (Form C, Form D), Reg A filings, and fund reports (N-PORT, N-PX, N-CEN). Datasets include executive compensation, directors and board members, audit fees, subsidiaries, and public float/outstanding shares. Historical coverage back to 1993 with support for all 400+ EDGAR form types; new filings made available within ~300 ms of posting. Live filing feeds available in real time via WebSocket for instant integration. XBRL-to-JSON service delivers standardized financial statements (income, balance sheet, cash flow) mapped to US GAAP items; dataset is survivorship-bias free.
Tested Verified by hands-on testing inside Find My Moat	Yes	Yes
Editor pick Featured inside curated shortlists	Standard listing	Highlighted

Frequently Asked Questions

Which workflows do Ahrefs and SEC API (sec-api.io) both support?

Both platforms cover APIs & SDKs workflows, so you can research those use cases in either tool before digging into the feature differences below.

Do Ahrefs and SEC API (sec-api.io) require subscriptions?

Both Ahrefs and SEC API (sec-api.io) keep freemium access with optional paid upgrades, so you can trial each platform before committing.

How can you access Ahrefs and SEC API (sec-api.io)?

Both Ahrefs and SEC API (sec-api.io) 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?

Ahrefs differentiates itself with Comprehensive toolkit: Site Explorer, Keywords Explorer, Site Audit, Rank Tracker, Content Explorer, and Web Analytics., Ahrefs Webmaster Tools (free) provides a lighter version of Site Explorer and Site Audit, plus Web Analytics for verified sites., and Looker Studio connectors available for Site Explorer, Rank Tracker, and Site Audit — reserved for Advanced and above., whereas SEC API (sec-api.io) stands out for Comprehensive API endpoints: query, full-text search, real-time streaming via WebSocket, download/PDF generator, XBRL-to-JSON conversion, and section extractors for 10-K/10-Q/8-K filings., Specialized form coverage including ADV, insider filings (Forms 3/4/5), 13F, 13D/G, Form 144, IPO registrations (S-1, 424B4), crowdfunding (Form C, Form D), Reg A filings, and fund reports (N-PORT, N-PX, N-CEN)., and Datasets include executive compensation, directors and board members, audit fees, subsidiaries, and public float/outstanding shares..

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Stay on top of related tools

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