ETF Screeners and Research Tools

The four tiers and what each is for

Tier 1: issuer primary sources. The fund page for an ISIN gives the factsheet (Chapter 24), the KID or summary prospectus, the full prospectus, annual reports, daily holdings, premium/discount history, tracking difference, and securities-lending disclosures. Everything the decision in Chapter 59 needs, from the entity legally responsible for it. Slower to browse, impossible to beat for accuracy.

Tier 2: screeners and aggregators. Their value is finding candidates: filter by index, domicile, replication, share class, TER, size, and (on the better platforms) multi-year tracking difference. Their weaknesses are consistent and knowable: data lag around share-class launches, occasional index-variant confusion, inconsistent benchmark variants in performance charts, and, on some free platforms, promoted placements that shape the ordering. Use them the way a researcher uses a search engine: to build the shortlist, never to close the question.

Tier 3: index providers. The methodology PDF is the only document that tells you the caps, buffers, screens and review calendar that will govern your fund for decades (Chapters 5, 40). Index factsheets give constituent counts, concentration, country and sector splits, and the official return series in each variant: the correct benchmark for Chapter 35's comparison.

Tier 4: community, media, and AI assistants. Forums (the Bogleheads community, national equivalents like Germany's and the UK's investing communities) are genuinely valuable for one thing: revealing questions you didn't know to ask, especially national tax and broker quirks. They are not sources. The same applies, with emphasis, to AI assistants including this book's own author-adjacent species: excellent at explaining a mechanism, unreliable on current numbers, and prone to confident errors on jurisdiction-specific tax rules. Verify in Tier 1 and 3, always.

Building a screen that actually works

Filters in the order that eliminates fastest, applying Chapter 59's logic:

1. Index (exactly, including capped variants).
2. Domicile (Ireland for US-heavy exposure; local requirements for wrappers).
3. Share class (accumulating/distributing; hedged/unhedged).
4. Fund size and inception (viability thresholds, enough history).
5. Replication (if you have a preference after Chapters 11 and 38).
6. TER as a sort, not a filter, and only now.
7. Tracking difference where the platform provides multi-year figures: the decision column.

That sequence typically reduces forty results to three in under two minutes, and the three are then compared properly in Tier 1.

Reading data critically

Six habits that separate research from browsing:

• Check the as-of date on every figure. Fund size, TER, TD and yields all age; a screener showing an undated number is showing you a rumour.
• Confirm the benchmark variant behind any performance comparison (price/gross/net, Chapter 35).
• Prefer total return over price return in charts, especially for distributing classes (Chapter 10).
• Watch currency of display: the same fund charted in USD and EUR tells different stories to a euro investor.
• Beware backfilled index history in young funds' charts: the index existed; the fund didn't, and the fund's costs never touched those years (Chapter 45's backtest warning generalizes).
• Cross-check one number between Tier 2 and Tier 1 whenever a platform is new to you. If they disagree, you've learned something about the platform.

Building a repeatable routine

The habit this book recommends, sized to reality:

• At purchase: the full Chapter 59 procedure, twenty minutes, written paragraph.
• Annually, thirty minutes total: re-check tracking difference and fund size for each holding, confirm savings-plan and platform fees haven't changed, refresh national tax numbers from the maintained table, and reread your own written policy.
• Never: daily fund comparisons, performance-chasing screens, or "is there a better fund?" browsing between reviews. That activity has a documented negative expected return (Chapter 64).

A worked example

Marek needs an emerging-markets fund for a satellite position.

• Tier 4 (10 minutes): a forum thread surfaces a question he hadn't considered: whether his country's tax treatment differs for funds below a certain equity ratio. Noted as a question, not an answer.
• Tier 2 (5 minutes): screens by index (a specific EM index), Irish domicile, accumulating, >€500m, sorted by TD: four candidates.
• Tier 3 (10 minutes): the index methodology confirms the country classification and capping rules he cares about (Chapter 39's Korea issue is live in EM indices).
• Tier 1 (15 minutes): the two finalists' factsheets and annual reports give TD history, lending disclosure and equity ratio: which also answers his Tier-4 tax question authoritatively.
• Decision, written: one paragraph, per Chapter 59.

Forty minutes, one decision, zero reliance on anyone's opinion including this book's: which is the outcome the whole of Part II was built to make possible.