Live on iOS & Android

Finally,
the fans
have a voice.

Review NFL penalty clips. Vote on referee calls. Hold officials accountable with the first fan-powered referee rating platform.

25+ Years of NFL Data
100% Fan Powered
iOS + Android Both Platforms
Free To Download

What You Get

Everything the refs don't want you to see.

The controversial calls that matter. Fan votes on every one. All in one place.

🎥

Watch the Controversial Calls

We curate clips of the penalty calls that actually matter — the ones fans are still debating. Not every flag, just the ones worth talking about.

🚩

Throw Your Challenge Flag

Vote on whether the call was correct or a blown call. See the fan verdict instantly and watch the community weigh in.

📢

Share the Debate

Take the conversation to X, Facebook, or wherever your crew is. Share your vote and the fan verdict directly from the app.

📚

Learn the Rules

Every penalty includes the official rulebook definition so you understand exactly what the refs are supposed to call — and whether they got it right.

How It Works

1

Watch the Play

Browse penalty clips from every NFL game. We curate the calls that actually matter, the controversial ones fans are still debating.

2

Throw Your Flag

Vote on whether the call was correct or a blown call. Your vote is instant and anonymous. No account required to see results.

3

See the Fan Verdict

Watch the community verdict form in real time. See how fans across the country rated the same call.

4

See How You Stack Up

Compare your verdict to fans across the country. Are you tougher on the refs than most? More forgiving? The data tells the story.

Also from ChallengeFlag

Draft Intelligence API

ML-powered prospect predictions for the NFL draft. Every prospect scored as a Star, Starter, or Dud with calibrated probabilities based on 25 years of combine and college production data.

  • Position-specific XGBoost models
  • Calibrated p(Star), p(Starter), p(Dud) for every prospect
  • Browser UI and full JSON API available
  • Used by NFL front office analysts
Request Access →
2026 Draft Rankings High Confidence
#1
Spencer Fano
Utah · OT
49.6%
#2
Malachi Lawrence
UCF · DE
51.0%
#3
Arvell Reese
Alabama · LB
49.6%
View Full Rankings →

The refs
made their call.
Now make yours.

Download Challenge Flag Ratings and join the first fan-powered referee accountability platform in NFL history.

Download on the
App Store
Get it on
Google Play