ETF explainers and tool comparisons

How to read ETF data: what each measurement means, what it has to be compared against to mean anything, which funds look expensive against their own history, and which tool answers which question.

How do I read a fund?

Method. What to look at, in what order, and what each number is worth on its own — then the same three readings taken on a real fund.

How to analyze an ETF: The six steps in the order a fundamental analyst actually works, and which tools support each one.
How to compare two ETFs: The five comparisons that separate two funds, and why fee and past return are not among them.
How much do two ETFs overlap?: What overlap measures, why the top-10 view understates it, and the pairs that overlap most.
What does SCHD add to a portfolio that already holds VTI?: One fund read three ways — overlap, valuation and concentration — and what happens when the three readings disagree.

Is it expensive?

The same measurement applied to the funds people ask about — each one judged against its own history, not against another fund.

Is my ETF expensive?: What a fund's P/E actually measures, and the two comparisons that turn it into an answer.
Are semiconductor ETFs expensive?: US semiconductor ETFs against their own historical multiples, and why they are not interchangeable.
Are AI ETFs expensive?: AI and robotics ETFs against their own history, where each provider decides for itself what counts as AI.
Are defense ETFs expensive?: Aerospace and defense ETFs against their own historical multiples.
Are data center ETFs expensive?: Data centers, the grid and utilities — the funds bought as the picks-and-shovels of AI demand.

Which tool does what?

Every tool opened logged out and asked for one specific thing, with the answer it gave. How the comparisons are made.

Best ETF research tools: Research tools tested on four capabilities you can check yourself, with every price read on the provider's own site.
Best ETF overlap checkers: Overlap checkers, tested on whether they quantify overlap by weight, in both directions, and what each costs.
Best ETF comparison tools: Comparison tools, tested on the four things a two-fund comparison actually needs to answer.
Portfolio X-Ray alternatives: The four questions people bring to a portfolio X-Ray, and what answers each one today.

How the tool comparisons are made

Each tool is opened logged out and asked for a specific thing — a figure, a table, a chart. A capability counts as present only if it produced that output; a capability the tool does not offer at all is an em-dash rather than a "no". Where a page scores tools 1–5, the rubric is printed above the table, because a score with no published rubric is an opinion wearing a number. Prices are the advertised rate on the provider's own pricing page; several providers block automated access, so those are read by hand.

Are these comparisons independent?

No listing is paid for, there are no affiliate links, and links to other providers are ordinary links. ETF Copilot is one of the tools tested and is held to the same published criteria as every other, with its results read the same way. Where a competitor answers a question better, the page names that competitor as the answer.

What is the best ETF tool?

There is no single answer, and a page giving one is ranking on something it has not told you. It depends which job you need: seeing what a fund holds, quantifying how much two funds overlap, comparing the companies inside two funds, or reading a valuation against something rather than as a bare number. Each comparison names the tool that answers its own question best.

Are free ETF tools good enough?

For most of the work, yes. Holdings, sector splits, side-by-side cost and past return are free and good on several sites without an account. The capabilities that are consistently missing free are overlap quantified by weight, fund-level fundamentals aggregated from holdings, and any figure read against its own history rather than printed on its own. Each comparison says which of those a given tool does and does not do, and what it costs.

About ETF Copilot

A daily research service covering US-listed equity ETFs. Each fund is scored 0–10 on four factors — Value, Growth, Quality and Risk — built from the aggregated fundamentals of what it holds, and measured both against the fund's own history and against the rest of the universe. It also computes look-through exposure, concentration and pairwise overlap across every holding rather than the top ten.

How these pages stay current

Every figure ETF Copilot computes is recalculated daily from the funds' published holdings, and each page states the date its figures were computed. Facts about other providers are different: they are re-checked by a person each quarter and carry the date they were checked. They are never advanced automatically — a "last verified" stamp that moves while nothing was checked is a claim about someone else's product that nobody made.

Nothing on this page is investment advice, a recommendation, or a forecast of returns. Third-party capabilities were checked on each provider's own site on August 24, 2026.