VOL. XCIV, NO. 247

★ FINANCIAL TOOLS & SERVICES DIRECTORY ★

PRICE: 5 CENTS

Tuesday, November 11, 2025

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Tool Comparison

Open Payments (CMS) vs Similarweb comparison

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

Quick takeaways

Open Payments (CMS) adds Regulatory Filings Monitoring coverage that Similarweb skips.

Similarweb includes App & Website Traffic, and Sheets / Excel Add-ins categories that Open Payments (CMS) omits.

In depth comparison

Open Payments (CMS)

openpaymentsdata.cms.gov

U.S. federal open‑data program (Affordable Care Act ‘Sunshine Act’) that publishes financial relationships between drug/device manufacturers (and GPOs) and healthcare providers (physicians, NPPs since PY2021, and teaching hospitals). CMS publishes the prior program year’s full datasets on or before June 30 each year and issues a January refresh. Data are accessible via the web search tool, bulk downloads, and a REST Open Data API (filter, query, aggregate).

Platforms

WebAPI

Pricing

Free

Quick highlights

Three core datasets each year: General Payments, Research Payments, and Ownership/Investment Interests.
Web search/explorer with filtering and charts; program year downloads available from the portal.
Open Data API (ODA) for programmatic access with filtering, querying, and aggregation (SoQL‑style).
Publication cadence: initial annual publication on/around June 30 for the prior year, plus a January data refresh.
Pre‑publication workflow: 45‑day recipient review & dispute (Apr 1–May 15) + 15‑day correction window (May 16–May 30).

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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

Open Payments (CMS)

Distinct strengths include:

Regulatory Filings Monitoring

Three core datasets each year: General Payments, Research Payments, and Ownership/Investment Interests.
Web search/explorer with filtering and charts; program year downloads available from the portal.
Open Data API (ODA) for programmatic access with filtering, querying, and aggregation (SoQL‑style).
Publication cadence: initial annual publication on/around June 30 for the prior year, plus a January data refresh.

Similarweb

Distinct strengths include:

App & Website Traffic Sheets / Excel Add-ins

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	Open Payments (CMS)	Similarweb
Categories Which research workflows each platform targets	Shared: Data APIs, APIs & SDKs, Data Visualizations Unique: Regulatory Filings Monitoring	Shared: Data APIs, APIs & SDKs, Data Visualizations Unique: App & Website Traffic, Sheets / Excel Add-ins
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	Free, Subscription
Key features Core capabilities called out by each vendor	Unique Three core datasets each year: General Payments, Research Payments, and Ownership/Investment Interests. Web search/explorer with filtering and charts; program year downloads available from the portal. Open Data API (ODA) for programmatic access with filtering, querying, and aggregation (SoQL‑style). Publication cadence: initial annual publication on/around June 30 for the prior year, plus a January data refresh. Pre‑publication workflow: 45‑day recipient review & dispute (Apr 1–May 15) + 15‑day correction window (May 16–May 30). Supplemental/lookup tables (e.g., Covered Recipient Profile Supplement; distinct physician profile) to aid joins.	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	Not yet	Yes
Editor pick Featured inside curated shortlists	Standard listing	Standard listing

Frequently Asked Questions

Which workflows do Open Payments (CMS) and Similarweb both support?

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

Do Open Payments (CMS) and Similarweb require subscriptions?

Both Open Payments (CMS) and Similarweb keep freemium access with optional paid upgrades, so you can trial each platform before committing.

How can you access Open Payments (CMS) and Similarweb?

Both Open Payments (CMS) 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?

Open Payments (CMS) differentiates itself with Three core datasets each year: General Payments, Research Payments, and Ownership/Investment Interests., Web search/explorer with filtering and charts; program year downloads available from the portal., and Open Data API (ODA) for programmatic access with filtering, querying, and aggregation (SoQL‑style)., 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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