How Listopedia works
How every ranking is researched, checked and ordered
Each list is a separate research project: a defined scope, a long list of candidates, facts gathered from primary sources, automated quality checks, an ordering rule stated in advance, and a review date. This page shows the process and the numbers behind it.
The six-step process behind each list
1. Scope and demand
We define what the list covers and what it excludes, and check what buyers actually search for, so the list answers a real question.
2. Candidate long list
Every company or product that could qualify is collected from registries, filings, market coverage and vendor directories, then filtered against the scope.
3. Primary-source research
Prices, revenue, headcount, founding dates and ownership are taken from official pricing pages, annual reports, stock-exchange and SEC filings, and company registers.
4. Quality gate
Automated checks confirm that every fact maps to a recorded source, ranks are complete, and promotional wording is absent. Claims that rest on a single or indirect source are flagged for review.
5. Ordering by a stated rule
Entries are ordered by the rule written in the list's Methodology section: a size metric for company rankings, or published criteria for software and services.
6. Publish and re-review
Each list shows its review date. Lists are re-checked when prices, ownership or results change, and corrections are made when a primary source supports them.
Where the facts come from
Share of all recorded sources across published lists, by type.
- Official filings and registers 8%
- Company websites and pricing pages 75%
- Industry rankings and research 7%
- News and trade press 11%
How large each list is
Number of lists by count of ranked entries.
Coverage by topic
Published lists per topic.
Anatomy of a list
Every list follows the same reference structure, so readers can compare categories and check the reasoning behind each position.
How rankings are ordered
| List type | Ordering rule | Main sources |
|---|---|---|
| Largest companies (by country or sector) | Strictly by one stated metric, usually latest full-year revenue, converted to one currency at a stated rate when companies report in different currencies | Annual reports, SEC and exchange filings, Fortune and Forbes published rankings |
| Top 50 editions | Revenue-ranked group first; companies that publish no revenue follow, ordered by published headcount. If fewer than 50 can be verified, the title shows the real number | Filings, results releases, company registers |
| Software | Published criteria stated in each list (scope of features, coverage, pricing transparency, fit for the use case), or a disclosed scoring model | Official product, documentation and pricing pages |
| Agencies and services | Verifiable scale signals such as fee income, headcount or rankings by named industry bodies, then years in operation | Industry rankings, company disclosures, award bodies |
What every list includes
- A definition of the category and how it differs from neighbouring ones
- The selection criteria and the ordering rule, stated before the entries
- For each entry: what it does, ownership, key facts, pricing where published, strengths and real limitations
- A comparison table, guidance by use case, recent developments and an FAQ
- The review date and internal links to related lists and company profiles
What we do not do
- Estimate or round up figures that a source does not state
- Publish star ratings, testimonials or user counts that cannot be traced
- Let payment change an entry's editorial position
- Copy text from other review sites
- Keep a figure when a newer primary source contradicts it
Labels you will see
An advertising profile supplied by the company and checked for factual accuracy. Shown in the Featured section, separate from the ranking.
A listing submitted or enhanced by the company. It may include a logo, image and website link marked rel="sponsored".
Our highest paid plan. Shown first in the Featured section with a lead form and up to three buttons, still separate from the ranking and also labelled Sponsored.
Full details are in the advertising disclosure and the editorial policy.
Tools used in research
Research combines AI-assisted collection from primary sources with automated quality checks. Every claim is recorded with its source in the list's research file; claims that rest on secondary or indirect evidence are reviewed and either confirmed against a primary source, reworded to what the source supports, or removed.
Corrections and updates
Company details change: prices move, firms are acquired, results are restated. To report an error, use the contact page with a link to the primary source. Lists are updated when a source supports the change, and the review date is refreshed.