VOL. XCIV, NO. 247

★ FINANCIAL TOOLS & SERVICES DIRECTORY ★

PRICE: 5 CENTS

Tuesday, October 28, 2025

Tool Comparison

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

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

Quick takeaways

SEC API (sec-api.io) adds Regulatory Filings Monitoring, Insider Data, 13F, 13D/13G, Financials, Management Compensation, and IPO coverage that Similarweb skips.

Similarweb includes App & Website Traffic, Sheets / Excel Add-ins, and Data Visualizations categories that SEC API (sec-api.io) omits.

In depth comparison

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

WebAPI

Pricing

FreeSubscription

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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Similarweb

similarweb.com

Hands-on review

Digital intelligence platform providing website and app traffic data, engagement benchmarks, and competitive insights. API access is sold separately or bundled with Enterprise plans, and is required for most native integrations (Excel, Sheets, Tableau, Power BI, Salesforce, HubSpot, Snowflake, Databricks). Webhooks support daily and monthly data release notifications. A free DigitalRank API offers basic website ranking data.

Platforms

WebAPI

Pricing

FreeSubscription

Quick highlights

Website traffic and engagement analytics, including keyword research, referral sources, and a free traffic checker tool.
APIs available in REST and Batch modes: REST delivers JSON responses, while Batch handles large CSV reports.
Webhook support for subscribing to daily or monthly data releases, with options to manage subscriptions directly.
Data Exporter for no-code bulk exports, including scheduled email delivery and CSV downloads.
Bulk input support for uploading CSV lists (up to ~1M entries per report) to create large exports.

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Where they differ

SEC API (sec-api.io)

Distinct strengths include:

Regulatory Filings Monitoring Insider Data 13F 13D/13G Financials 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.

Similarweb

Distinct strengths include:

App & Website Traffic Sheets / Excel Add-ins Data Visualizations

Website traffic and engagement analytics, including keyword research, referral sources, and a free traffic checker tool.
APIs available in REST and Batch modes: REST delivers JSON responses, while Batch handles large CSV reports.
Webhook support for subscribing to daily or monthly data releases, with options to manage subscriptions directly.
Data Exporter for no-code bulk exports, including scheduled email delivery and CSV downloads.

Feature-by-feature breakdown

Attribute	SEC API (sec-api.io)	Similarweb
Categories Which research workflows each platform targets	Shared: Data APIs, APIs & SDKs Unique: Regulatory Filings Monitoring, Insider Data, 13F, 13D/13G, Financials, Management Compensation, IPO	Shared: Data APIs, APIs & SDKs Unique: App & Website Traffic, Sheets / Excel Add-ins, Data Visualizations
Asset types Supported asset classes and universes	Stocks, ETFs, Mutual Funds, Funds	Other
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 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.	Unique Website traffic and engagement analytics, including keyword research, referral sources, and a free traffic checker tool. APIs available in REST and Batch modes: REST delivers JSON responses, while Batch handles large CSV reports. Webhook support for subscribing to daily or monthly data releases, with options to manage subscriptions directly. Data Exporter for no-code bulk exports, including scheduled email delivery and CSV downloads. Bulk input support for uploading CSV lists (up to ~1M entries per report) to create large exports. Dashboard and table exports in Excel, PDF, PPT, and PNG formats.
Tested Verified by hands-on testing inside Find My Moat	Yes	Yes
Editor pick Featured inside curated shortlists	Highlighted	Standard listing

Frequently Asked Questions

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

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

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

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

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

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

SEC API (sec-api.io) differentiates itself with 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., whereas Similarweb stands out for Website traffic and engagement analytics, including keyword research, referral sources, and a free traffic checker tool., APIs available in REST and Batch modes: REST delivers JSON responses, while Batch handles large CSV reports., and Webhook support for subscribing to daily or monthly data releases, with options to manage subscriptions directly..

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