Corner of Berkshire & Fairfax (COBF) adds Forums coverage that ETF Insider skips.
VOL. XCIV, NO. 247
★ FINANCIAL TOOLS & SERVICES DIRECTORY ★
PRICE: 5 CENTS
Sunday, October 5, 2025
Head-to-head
Corner of Berkshire & Fairfax (COBF) vs ETF Insider comparison
Compare pricing, supported platforms, categories, and standout capabilities to decide which tool fits your workflow.
Quick takeaways
ETF Insider includes ETF Overview, ETF Performance, ETF Holdings, ETF Factors, ETF Overlap, ETF Screeners, Data Visualizations, Portfolio, Correlation, and APIs & SDKs categories that Corner of Berkshire & Fairfax (COBF) omits.
Corner of Berkshire & Fairfax (COBF) highlights: Public discussion boards focused on Berkshire Hathaway, Fairfax Financial, general investing, books, and broader market conversations., Members-only sections covering investment ideas, personal finance, strategies, real estate, wealth management, events, and more., and One-time lifetime membership fee of $49.99 USD, available through the site’s shop..
ETF Insider is known for: Holdings look‑through & overlap: visualize shared constituents across funds to surface concentration risk and duplication., Correlation matrix across portfolio assets; efficient‑frontier visualization with Sharpe‑ratio context., and Sankey diagrams, drill‑downs by asset class, sector, geography and exchange; customizable visualizations..
Corner of Berkshire & Fairfax (COBF)
thecobf.com
A long-standing value-investing forum founded in 2009, with public boards and members-only sections. Membership is a one-time lifetime fee of $49.99, purchased through the site’s shop. The community hosts thousands of investors, with active discussions, member-submitted articles, and dedicated rooms for deeper collaboration.
Platforms
Web
Pricing
Free
One-time
Quick highlights
- Public discussion boards focused on Berkshire Hathaway, Fairfax Financial, general investing, books, and broader market conversations.
- Members-only sections covering investment ideas, personal finance, strategies, real estate, wealth management, events, and more.
- One-time lifetime membership fee of $49.99 USD, available through the site’s shop.
- Private Members Room (also known as the COBF Zoom Room) reserved for paid members.
- Podium section for blog-style, user-submitted articles, accessible via forum login.
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ETF Insider
etfinsider.co
Editor’s pick Hands-on review
ETF & mutual fund overlap/correlation and portfolio visualization tool featuring Sankey look‑through, correlation matrices, and efficient‑frontier (Sharpe) views. Free tier allows up to 4 saved portfolios and limited full‑holdings visibility; Pro ($14/mo) unlocks unlimited portfolios, full holdings depth, and Excel export. Enterprise adds a financial data API, custom reports/visualizations, and white‑label options. Coverage explicitly includes **US‑listed ETFs & mutual funds**; equities coverage is described as **international** on pricing, but the FAQ states non‑US assets not listed in the US are not supported (current constraint). Holdings are sourced primarily from SEC EDGAR and refreshed on a quarterly cadence based on filings; data may be delayed per exchanges/providers.
Categories
Platforms
Web
API
Pricing
Free
Subscription
Quick highlights
- Holdings look‑through & overlap: visualize shared constituents across funds to surface concentration risk and duplication.
- Correlation matrix across portfolio assets; efficient‑frontier visualization with Sharpe‑ratio context.
- Sankey diagrams, drill‑downs by asset class, sector, geography and exchange; customizable visualizations.
- ETF screener (filters by asset class, geography, theme, provider, sector) and performance & info panels.
- Portfolio tooling: save portfolios (4 on Free; unlimited on Pro), CSV upload (Symbol, Quantity).
Community votes (overall)
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Overlap
Shared focus areas
1 overlapBoth tools cover this research theme.
Where they differ
Corner of Berkshire & Fairfax (COBF)
Distinct strengths include:
- Public discussion boards focused on Berkshire Hathaway, Fairfax Financial, general investing, books, and broader market conversations.
- Members-only sections covering investment ideas, personal finance, strategies, real estate, wealth management, events, and more.
- One-time lifetime membership fee of $49.99 USD, available through the site’s shop.
- Private Members Room (also known as the COBF Zoom Room) reserved for paid members.
ETF Insider
Distinct strengths include:
ETF Overview
ETF Performance
ETF Holdings
ETF Factors
ETF Overlap
ETF Screeners
Data Visualizations
Portfolio
- Holdings look‑through & overlap: visualize shared constituents across funds to surface concentration risk and duplication.
- Correlation matrix across portfolio assets; efficient‑frontier visualization with Sharpe‑ratio context.
- Sankey diagrams, drill‑downs by asset class, sector, geography and exchange; customizable visualizations.
- ETF screener (filters by asset class, geography, theme, provider, sector) and performance & info panels.
Feature-by-feature breakdown
| Attribute | Corner of Berkshire & Fairfax (COBF) | ETF Insider |
|---|---|---|
Categories Which research workflows each platform targets | Shared: Blogs Unique: Forums | Shared: Blogs Unique: ETF Overview, ETF Performance, ETF Holdings, ETF Factors, ETF Overlap, ETF Screeners, Data Visualizations, Portfolio, Correlation, APIs & SDKs |
Asset types Supported asset classes and universes | Stocks | ETFs, Mutual Funds, Stocks |
Experience levels Who each product is built for | Beginner, Intermediate, Advanced | Beginner, Intermediate, Advanced |
Platforms Where you can access the product | Web | Web, API |
Pricing High-level pricing models | Free, One-time | Free, Subscription |
Key features Core capabilities called out by each vendor | Unique
| Unique
|
Tested Verified by hands-on testing inside Find My Moat | Not yet | Yes |
Editor pick Featured inside curated shortlists | Standard listing | Highlighted |
Frequently Asked Questions
Which workflows do Corner of Berkshire & Fairfax (COBF) and ETF Insider both support?
Both platforms cover Blogs workflows, so you can research those use cases in either tool before digging into the feature differences below.
Do Corner of Berkshire & Fairfax (COBF) and ETF Insider require subscriptions?
Both Corner of Berkshire & Fairfax (COBF) and ETF Insider keep freemium access with optional paid upgrades, so you can trial each platform before committing.
How can you access Corner of Berkshire & Fairfax (COBF) and ETF Insider?
Both Corner of Berkshire & Fairfax (COBF) and ETF Insider 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?
Corner of Berkshire & Fairfax (COBF) differentiates itself with Public discussion boards focused on Berkshire Hathaway, Fairfax Financial, general investing, books, and broader market conversations., Members-only sections covering investment ideas, personal finance, strategies, real estate, wealth management, events, and more., and One-time lifetime membership fee of $49.99 USD, available through the site’s shop., whereas ETF Insider stands out for Holdings look‑through & overlap: visualize shared constituents across funds to surface concentration risk and duplication., Correlation matrix across portfolio assets; efficient‑frontier visualization with Sharpe‑ratio context., and Sankey diagrams, drill‑downs by asset class, sector, geography and exchange; customizable visualizations..
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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.