VOL. XCIV, NO. 247

★ FINANCIAL TOOLS & SERVICES DIRECTORY ★

PRICE: 5 CENTS

Sunday, October 5, 2025

View OpenCorporatesView SimilarwebBack to Home

Head-to-head

OpenCorporates vs Similarweb comparison

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

Quick takeaways

OpenCorporates adds Regulatory Filings Monitoring, and Other coverage that Similarweb skips.

Similarweb includes App & Website Traffic, APIs & SDKs, Sheets / Excel Add-ins, and Data Visualizations categories that OpenCorporates omits.

OpenCorporates highlights: 230M+ company records spanning 145+ jurisdictions, aggregated from 140+ official registries with full provenance and source links., Versioned REST API with JSON (default) or XML output; API keys required. Free tier provides up to 200 requests per month (50 per day)., and OpenRefine Reconciliation API allows entity-matching from company names to legal identifiers..

Similarweb is known 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..

OpenCorporates logo

OpenCorporates

opencorporates.com

The world’s largest open database of legal entities, offering both a public-facing search and an API. Free access is available for personal or public-benefit use, while commercial API access and bulk datasets require a paid plan. Bulk deliveries are provided via SFTP in CSV format, and the platform includes a public status page for web, API, knowledge base, and SFTP availability.

Platforms

Web
API

Pricing

Free
Subscription

Quick highlights

  • 230M+ company records spanning 145+ jurisdictions, aggregated from 140+ official registries with full provenance and source links.
  • Versioned REST API with JSON (default) or XML output; API keys required. Free tier provides up to 200 requests per month (50 per day).
  • OpenRefine Reconciliation API allows entity-matching from company names to legal identifiers.
  • Enterprise bulk access via SFTP, with six structured CSV datasets (Companies, Officers, Non-Registered Addresses, Alternative Names, Additional Identifiers, and Relationships).
  • Relationships dataset includes 30M+ links covering subsidiaries, branches, control statements, and shareholdings, with data from sources like the SEC and UK PSC.

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Similarweb logo

Similarweb

similarweb.com

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

Web
API

Pricing

Free
Subscription

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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Overlap

Shared focus areas

1 overlap

Both tools cover this research theme.

Where they differ

OpenCorporates

Distinct strengths include:

Regulatory Filings Monitoring
Other
  • 230M+ company records spanning 145+ jurisdictions, aggregated from 140+ official registries with full provenance and source links.
  • Versioned REST API with JSON (default) or XML output; API keys required. Free tier provides up to 200 requests per month (50 per day).
  • OpenRefine Reconciliation API allows entity-matching from company names to legal identifiers.
  • Enterprise bulk access via SFTP, with six structured CSV datasets (Companies, Officers, Non-Registered Addresses, Alternative Names, Additional Identifiers, and Relationships).

Similarweb

Distinct strengths include:

App & Website Traffic
APIs & SDKs
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

AttributeOpenCorporatesSimilarweb
Categories

Which research workflows each platform targets

Shared: Data APIs

Unique: Regulatory Filings Monitoring, Other

Shared: Data APIs

Unique: App & Website Traffic, APIs & SDKs, Sheets / Excel Add-ins, Data Visualizations

Asset types

Supported asset classes and universes

Other

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

  • 230M+ company records spanning 145+ jurisdictions, aggregated from 140+ official registries with full provenance and source links.
  • Versioned REST API with JSON (default) or XML output; API keys required. Free tier provides up to 200 requests per month (50 per day).
  • OpenRefine Reconciliation API allows entity-matching from company names to legal identifiers.
  • Enterprise bulk access via SFTP, with six structured CSV datasets (Companies, Officers, Non-Registered Addresses, Alternative Names, Additional Identifiers, and Relationships).
  • Relationships dataset includes 30M+ links covering subsidiaries, branches, control statements, and shareholdings, with data from sources like the SEC and UK PSC.
  • Data acquisition ranges from hourly to quarterly; registry ingestion checks run every 5 minutes. Bulk deliveries are typically no more than one month behind official registries.

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.
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Frequently Asked Questions

Which workflows do OpenCorporates and Similarweb both support?

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

Do OpenCorporates and Similarweb require subscriptions?

Both OpenCorporates and Similarweb keep freemium access with optional paid upgrades, so you can trial each platform before committing.

How can you access OpenCorporates and Similarweb?

Both OpenCorporates 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?

OpenCorporates differentiates itself with 230M+ company records spanning 145+ jurisdictions, aggregated from 140+ official registries with full provenance and source links., Versioned REST API with JSON (default) or XML output; API keys required. Free tier provides up to 200 requests per month (50 per day)., and OpenRefine Reconciliation API allows entity-matching from company names to legal identifiers., 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..

Keep exploring

Stay on top of related tools

Browse the categories and profiles that overlap most with this comparison to round out your shortlist.

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.