Ad Fontes Media is a Colorado‑based for‑profit public benefit corporation that produces a nonpartisan Media Bias Chart rating news outlets on political bias and reliability.
Researchers, journalists, advertisers, and media‑literacy educators use it as a quick reference alongside other bias‑assessment tools.
External context
When building or evaluating your own website, the chart can help you understand how your content might be positioned on the bias‑reliability spectrum and inform decisions about brand safety. Its ratings are derived from a diverse panel of analysts, so they reflect a range of political perspectives rather than a single viewpoint. However, treat the chart as a helpful guide rather than an absolute authority, and complement it with additional sources of media analysis.
Ad Fontes Media Wikipedia contributors, “Ad Fontes Media”, en.wikipedia.orgLicence01What it is and how it works
Ad Fontes Media runs a continuous survey of thousands of articles. Each article is read by a diverse group of reviewers who place it on a two‑dimensional grid: political bias (left‑right) and reliability (low‑high). The individual ratings are aggregated into a single bias score and a reliability score for each outlet. The scores are updated monthly, so the system reflects recent editorial changes. Marketers use these scores to decide whether an outlet aligns with brand safety policies.
Ad Fontes Media rates news sites on bias and trust using scores from many reviewers.
02What to do about it this week
1. Pull the latest Ad Fontes Media CSV from their public data page. 2. Import the file into your brand‑safety dashboard. 3. Flag any outlet with a reliability score below 5 for review. 4. Add a rule in your media‑buying platform to exclude outlets that exceed a bias threshold you define (for example, beyond 3 on the left‑right axis). 5. Share the filtered list with your content team so they can prioritize high‑trust sources for guest posts and PR pitches.
- Download the CSV from the official Ad Fontes Media site.
- Map the bias and reliability columns to your internal risk categories.
- Set up an automated alert for any score changes that cross your thresholds.
03How it is measured or noticed
The most visible sign of an Ad Fontes Media rating is the two numbers that appear next to the outlet’s name on the Ad Fontes website: a bias score (‑10 to +10) and a reliability score (0‑10). In third‑party tools, the scores are often displayed as a colored badge—green for high reliability, yellow for moderate, red for low. When you run a brand‑safety audit, look for those badges in your media list or search for the outlet’s name in the CSV file to verify its current rating.
How the record puts it
Ad Fontes Media, Inc.
04Common mistakes
- Assuming a single bias score tells the whole story; reliability is a separate dimension that matters for brand safety.
- Treating the scores as static; they change as outlets shift editorial lines.
- Relying on outdated CSV files; always use the most recent release.
05Limits and confusion points
Ad Fontes Media only rates outlets that publish news articles in English or have a sizable English‑language audience. It does not cover niche blogs, podcasts, or social‑media accounts that lack a formal editorial process. The system is sometimes confused with political‑bias tools that rank individual articles; Ad Fontes focuses on the outlet as a whole, not on specific pieces of content.
06Worked example
"We checked the Ad Fontes Media CSV, saw that 'TechDaily' had a bias score of +2 and a reliability score of 4.5. Because the reliability was below our threshold of 5, we paused the upcoming sponsored post and moved the budget to 'GadgetReview', which scores +1 and 7.2. The switch kept the campaign within our brand‑safety policy and avoided potential backlash."
The entry above is written by GetLoopLoop. What follows is what independent catalogues hold about the same term — none of it is the source of this page.
- Also called
- Ad Fontes
- Kind of thing
- website, company, benefit corporation
The same term on Wikipedia
Catalogued in 2 languages07Frequently asked questions
What makes the bias scores on that website different from other media bias rating systems?
Usually the scores combine a bias dimension from -10 to +10 with a reliability rating, based on thousands of article reviews by a politically diverse panel. This dual‑axis approach tries to separate political slant from factual accuracy, unlike many single‑axis charts.
Should I rely on those scores when choosing sources for my daily news feed?
It depends on what you need; the scores give a snapshot of an outlet’s overall tendency and trustworthiness, but they don’t guarantee every article meets the same standards. Use them as a guide alongside your own judgment and topic‑specific checks.
How are the bias and reliability numbers actually calculated?
Usually a large panel of reviewers rates each article on political leaning and factual quality, then the platform aggregates those ratings into a composite bias score and a reliability score. The process is continuous, with new articles added and scores updated regularly.
Do the ratings still reflect recent political shifts and changes in editorial policy?
Usually they try to stay current by constantly surveying new articles, but there can be a lag of weeks or months before a major shift shows up in the numbers. Checking the latest update date on the site can help you gauge freshness.
What could happen if I treat a high‑reliability outlet as completely trustworthy?
Usually you risk overlooking occasional errors or bias that the aggregate score smooths over, which can lead to misinformation or a skewed perspective. It’s best to still verify critical facts, especially on contentious topics.
How often are the scores refreshed and when will a newly popular outlet appear in the rankings?
Usually the platform updates its database weekly, adding new outlets once they have enough English‑language content and reviewer data. A brand new site may need several weeks of article submissions before it receives a rating.
Wikimedia Commons
Related visuals with source and licence credit
08Asked out loud
The same term in the words somebody uses speaking to an assistant rather than typing into a box — written from the situation, which is why each one carries the situation it came from.
Yes, you can look up the outlet on the Ad Fontes Media website and read the two numbers next to its name: the bias score and the reliability score. Those figures give you an immediate sense of its political leaning and factual trustworthiness.
Usually you can ask a voice assistant to search for the outlet’s Ad Fontes Media rating and read the result aloud. If the assistant can access the web, it will return the bias and reliability numbers for you.
Usually you check the bias score on the Ad Fontes Media page; a negative number indicates a left‑leaning orientation. Pair that with the reliability score to decide whether the outlet meets your standards for the report.