Methodology
What AmboView does
AmboView groups articles about the same event from many outlets into a single story, then shows you who covered it and how the coverage splits across the political spectrum. We publish headlines and short snippets for comparison and link out to the original publishers — we never republish article text.
Bias ratings
AmboView does not rate outlets. Each outlet’s bias rating (Left, Lean Left, Center, Lean Right, Right) is taken from the published media-bias charts of independent third-party raters — AllSides, Ad Fontes Media, and Media Bias/Fact Check — retrieved on the date shown in the outlet directory. A story’s bias bar counts the articles in that story by their outlets’ ratings, segment by segment.
Factuality
Each outlet also carries a publisher-level reliability score (0–100) drawn from the same raters’ published factuality assessments. A story’s factuality band averages the scores of the distinct outlets covering it: High (75+), Mixed (50–74), Low (below 50). These ratings describe an outlet’s overall track record — not the accuracy of any single article.
The blindspot rule
A story is flagged as a blindspot for one side when, with at least 5 rated articles, the opposite side accounts for 70% or more of the coverage while the flagged side accounts for 15% or less. It is a coverage-imbalance signal, not a judgment about the story.
Story clustering
Articles are collected from outlet RSS feeds and free news indexes (GDELT, Currents) every few hours, deduplicated, and grouped by headline similarity, shared entities, and publication time. A story joins the daily edition only when at least 3 articles from at least 2 different outlets cover it.
Corrections
If an outlet’s rating or a story’s grouping looks wrong, the rating belongs to the third-party rater named in the directory — check their methodology and appeals process — and the grouping is ours to fix. Ratings are refreshed quarterly against the published charts.