Underdog Fantasy Chrome Extension — NFL & PGA

Draft
Brain.

Chrome extensions for Underdog Fantasy that give serious players real-time ownership data, duplicate detection, QB stack intelligence, and post-draft analysis — right at the draft board.

⚡ Get Started Free See our products

PGA & NFL on the Chrome Web Store  ·  MLB coming soon

Draft Brain PGA overlay running during a live Underdog Fantasy PGA draft — showing player ownership percentages, duplicate warnings, and pairing counts
5
free PGA drafts
10
free NFL drafts
1.5s
live rescan interval
0
bytes sent externally
Products

One brand.
Every sport.

Draft Brain builds sport-specific overlays tuned to the unique structure of each fantasy format. PGA and NFL are live on the Chrome Web Store. MLB is on the way.

● Live
⛳ PGA Golf
Draft Brain
PGA

Built for 6-player Underdog Fantasy PGA drafts. Detect duplicate lineups, track exposure percentages, and find pairing patterns — all in real time.

  • Duplicate lineup detection
  • Player exposure % tracking
  • First-pick pairing counts
  • Color-coded team warnings
  • One-click team scraping
  • Portfolio analyzer
Install on Chrome →
● Live
🏈 NFL
Draft Brain
NFL

Built for Underdog Fantasy NFL snake drafts. Real-time ownership %, QB stack detection, combo partner badges, and post-draft analysis — all in one overlay.

  • Split ownership pills (tourney% | overall%)
  • QB stack highlighting — up to 4 QBs, color-coded
  • Combo partner detection (4×+ threshold)
  • Portfolio analyzer & team builder
  • Post-draft ADP value breakdown
Install on Chrome →
Coming soon
⚾ MLB
Draft Brain
MLB

MLB-specific draft intelligence built for Underdog Fantasy baseball. Ownership tracking, stack detection, and duplicate warnings tuned to the unique structure of baseball slates.

  • Player ownership % tracking
  • Pitcher stack detection
  • Duplicate lineup warnings
  • Portfolio exposure analysis
  • Post-draft breakdown
Notify me
Get notified

Be first when MLB launches

PGA and NFL are live now. Drop your email and we'll notify you the moment MLB goes live.

NFL Overlay — Features

Built for the snake draft
board, pick by pick

Draft Brain NFL runs on Underdog Fantasy NFL snake drafts — surfacing ownership, stack intelligence, and combo data the moment you need it.

📊
Ownership % badges
Every player shows their ownership % across your saved teams — live during the draft. When you've filtered to a specific tournament, a split badge shows both your tournament ownership and your overall portfolio % side by side, so you can spot where you're over- or under-exposed at a glance.
🏈
QB stack (TS) detection
The moment you draft a QB, every teammate in the player list gets a color-coded TS badge and a tinted row so they're impossible to miss. Track up to four QB stacks at once — each in a distinct color — for the rest of the draft.
🔗
Combo partner badges
Players you frequently pair with your current picks get a combo badge showing how many of your saved teams include that combination. Spot your recurring build patterns and find your best combinations without leaving the draft.
📋
Portfolio analyzer
Open the Analyze Portfolio window for a full breakdown of your saved teams — NFL team exposure, your most common player pairings, how you tend to build your rosters, and which draft slots you've been drafting from.
🏆
Post-draft analysis
After finishing a draft, the Post Draft window grades every pick against consensus ADP, shows your cumulative draft value, and breaks down how your draft capital was spread across positions — with callouts flagging any big deviations. See full breakdown →
⚡
CSV upload & auto-scrape
Load your teams in seconds — either by uploading your Underdog exposure CSV or by letting the extension scrape your completed drafts automatically. CSV upload gives you the most complete data for stack detection and portfolio analysis.
In action

See it live on the draft board

Real screenshots from Draft Brain NFL running on Underdog Fantasy.

Draft Brain NFL Chrome extension popup panel showing Pro plan, tournament filter, and overlay toggle

Popup panel — Pro plan, tournament filter & overlay toggle

Draft Brain NFL split ownership pills showing tournament ownership percentage on the left and overall portfolio percentage on the right

Split ownership pills — tourney % left, overall % right

Draft Brain NFL live draft overlay on Underdog Fantasy showing real-time ownership percentage badges on every player

Live draft — ownership % badges on every player

Draft Brain NFL QB stack detection — Josh Allen drafted, all Buffalo Bills teammates highlighted with TS badge

QB stack detection — BUF teammates highlighted with TS badge after drafting Josh Allen

Post Draft Analysis

Review every pick
after the draft ends

Click Post Draft Analysis in the popup right after finishing a draft. The window pulls in your full roster and grades the entire draft — yours and everyone else's at the table.

Draft Brain NFL Post Draft Analysis window showing team construction, pick-by-pick ADP grades, and draft capital allocation by position

Post Draft Analysis — starters, bench grades, and capital allocation

📋 Summary cards

Three cards at the top give you an instant read: your team construction (QB-RB-WR-TE counts), your cumulative draft value (positive means you got value on average, negative means you reached), and the best value pick of the whole draft — across all 12 teams.

📊 Pick-by-pick grades

Every pick is listed with the round it was taken and its ADP, then graded by how much earlier or later it went versus consensus. Green = great value, blue = solid value, gray = on ADP, yellow = slight reach, red = big reach. Starters and bench are listed separately.

🏈 Draft capital allocation

A breakdown of how much of your draft capital went to each position, compared against optimal targets. Includes a pie chart and plain-language callouts — like "light on RB capital" or "heavy WR investment" — so you know what to watch in your next draft.

NFL Badge System

Every badge, explained

Draft Brain NFL annotates the player list in real time. All three badge types can appear on the same player simultaneously.

J. Jefferson44.4%
Ownership %
How often this player appears across your saved teams. When you're filtering to a specific tournament, the badge splits to show both your tournament ownership and your overall rate — useful for spotting where you're concentrated versus diversified.
D. Adams31.2%TS
QB Stack (TS)
This player is on the same NFL team as a QB you've already drafted. Each QB gets its own color so you can tell stacks apart instantly. The row stays highlighted for the rest of the draft, even as you scroll.
C. Lamb58.3%with 8×
Combo partner
You've built this player into your lineups alongside your current picks multiple times. The number tells you how often — handy for recognizing your own tendencies mid-draft.
NFL Pricing

Free to start. Pro for serious players.

Draft Brain NFL is free for your first 10 drafts — no card needed. Upgrade to Pro for unlimited teams, the full portfolio analyzer, and post-draft analysis. More features are planned and will be added over time.

Free
$0
Up to 10 drafts
PRO
$15/mo
or $100/yr · unlimited teams
PGA Overlay — Features

Every edge you need
at the draft board

Draft Brain PGA runs silently in the background and surfaces exactly what you need — before you make a pick you'll regret.

🎯
Duplicate detection
Warns you the moment your current draft starts to match a lineup you have already saved. Danger players are flagged directly in the list — color-coded by which saved team is at risk — so you can steer clear before it is too late.
📊
Live exposure %
Every golfer in the list shows their ownership % across your saved teams — updated live as you draft. Know where you're concentrated at a glance, without leaving the draft.
🔗
Pairing intelligence
After your first pick, every remaining player shows how many of your saved lineups pair them with that opening selection. Higher numbers reveal your most common combinations.
⚡
One-click data loading
Scrape your completed drafts directly from Underdog with one click, or upload your exposure CSV. Your lineup data is loaded and ready before the draft clock starts.
🎮
Draggable overlay
The floating panel lives on top of the draft screen — drag it anywhere, minimize it, or hide it instantly. No tab switching, no context loss, no disruption.
📈
Analyze Portfolio
After loading your teams, open the Analyze Portfolio window for a full breakdown — player exposures ranked by frequency, draft slot distribution, and your most common two-player pairings across all your lineups.
🔒
Fully private
All data is stored locally in your browser. Nothing is sent anywhere. Your lineups stay yours — and the overlay works offline once your teams are loaded.
Analyze Portfolio

See your full book
before the draft starts

Click 📈 Analyze Portfolio in the popup after loading your teams. The window breaks down your entire portfolio across three panels — no draft required.

Draft Brain PGA Analyze Portfolio window showing player exposures, draft slot distribution, and top 10 player combinations

Analyze Portfolio — exposures, draft slot distribution, and top combos

📊 Summary bar

Four headline numbers at a glance: total teams drafted, unique players across your portfolio, your top exposure percentage, and your top combo count — the most times any two players appear together.

🔍 Player Exposures

A searchable table of every golfer in your portfolio, sorted by how often they appear. Shows team count, a visual exposure bar, and the exact percentage. Use the search box to quickly find any player.

🎯 Draft Slot Distribution

A bar chart showing how many teams you've drafted from each of the six snake-draft seats. Each bar also shows your most common first-round pick from that seat — useful for spotting positional tendencies.

🔗 Top 10 Combos

The most frequently paired two-player combinations across your portfolio, ranked by count. Helps you spot over-correlated builds and understand your own drafting patterns before you enter a new draft.

Setup

Up and running
in 60 seconds

1
Install the extension
Download Draft Brain PGA and load it into Chrome. The 🧠 icon appears in your toolbar — pin it for easy access.
2
Enter your Underdog username
Type your handle in the popup. Draft Brain uses this to track only your picks — ignoring other drafters in the room entirely.
3
Load your saved teams
Navigate to your completed tournament page and hit Scrape — or upload your Underdog exposure CSV. Takes under 10 seconds.
4
Draft with confidence
Join any live PGA draft. The overlay activates automatically. Every player labeled, every duplicate flagged, every pairing counted — in real time.
Underdog Fantasy completed drafts page with Draft Brain NFL overlay ready to scrape team data
Pick-by-pick intelligence

The right data
at every pick

Draft Brain knows what information matters at each stage of the draft — and shows you exactly that, nothing more.

Before pick 1
Exposure everywhere
Every player shows how often they appear in your saved lineups. See where you're concentrated before you make a single pick.
34.1%
After pick 1
Pairing counts appear
Each remaining player gets a count of how many saved lineups pair them with your first pick. Find your highest-leverage combinations.
7 pairings
After pick 2
Duplicate warnings active
As soon as your picks start overlapping with a saved lineup, danger players are flagged with a color-coded warning directly in the draft list.
⚠ 2/6 matched
Full match
Duplicate alert
If your picks fully match a saved lineup, the overlay fires a duplicate alert. You always know before it's too late to change course.
🚨 DUPLICATE
Badge system

Every player labeled.
Every risk flagged.

Draft Brain annotates the player list in real time. Here's what each badge means and when it appears.

R. McIlroy34.1%
Exposure %
Always visible when teams are loaded. Shows how often this golfer appears across your saved lineups — so you can see where you're concentrated without leaving the draft.
S. Scheffler58.3%7
Pairing count
Appears after pick 1 only. How many saved teams pair this player with your first pick. Higher numbers reveal your most common combinations.
C. Bezuidenhout24.4%⚠ 2/6
Danger warning
This pick would start to overlap with a saved lineup. The row highlights in that lineup's color — a signal to reconsider before you create a duplicate.
S. Straka31.2%⚠ 3/6
Deep danger
Half your roster already matches a saved team. Multiple at-risk teams tracked simultaneously, each in a distinct color matching the panel warning.
Pricing — PGA Overlay

Start free.
Upgrade when ready.

No credit card required to get started. Try Draft Brain PGA with up to 5 saved teams — completely free.

Free
$0
forever · no card needed
  • Up to 5 saved teams
  • Duplicate detection
  • Exposure % badges
  • Pairing count badges
  • Unlimited teams
  • Priority support
Install free →
Most Popular
Pro
$5
per month  ·  cancel anytime
  • Unlimited saved teams
  • Duplicate detection
  • Exposure % badges
  • Pairing count badges
  • Up to 150 teams per scrape
  • Priority support
Get Pro — $5/mo →

Payments secured by Stripe

Installation

Four steps to your
first draft edge

01
Install from Chrome Web Store
Find Draft Brain NFL on the Chrome Web Store and click Add to Chrome — no developer mode needed.
02
Pin the extension
Click Add extension in the confirmation dialog, then pin the 🧠 icon via the puzzle-piece Extensions menu in Chrome's toolbar.
03
Set your username
Click the 🧠 icon and enter your Underdog handle. This filters your picks from other drafters in the room.
04
Load your teams
Navigate to your completed tournament page and click Scrape — or upload your Underdog exposure CSV. Then hit Analyze Portfolio to review your exposures and combos before the draft.
FAQ

Questions

What sports does Draft Brain support?
Both the PGA Golf and NFL overlays are available now on the Chrome Web Store. MLB is coming soon — sign up above to be notified at launch.
Does Draft Brain work on any PGA contest on Underdog?
Yes — it works on all 6-player PGA golf drafts on app.underdogfantasy.com. The overlay activates automatically when you enter any live PGA draft, and the Analyze Portfolio window is available any time your teams are loaded.
Can other players in the draft see I'm using it?
No. Draft Brain runs entirely in your own browser and is completely invisible to other players in the draft and to Underdog.
What's the difference between scraping and uploading a CSV?
Scraping reads your teams directly from the Underdog completed drafts page — fast, no file handling, but always replaces existing data. CSV upload imports from Underdog's exposure export and merges with existing data, letting you combine multiple uploads.
How does the free tier limit work?
Free tier limits vary by product. The PGA overlay free plan saves up to 5 teams — enough to try the full feature set before upgrading to Pro for unlimited teams. The NFL overlay free plan covers your first 10 drafts at no cost, then Pro is $15/mo or $100/yr for unlimited teams.
Is my lineup data private?
Completely. All your team data stays on your own device — nothing is sent anywhere. See our Privacy Policy for full details.
Will it break if Underdog updates their site?
We monitor Underdog Fantasy for site changes and push updates promptly if anything breaks. If you ever run into an issue after an Underdog update, check back for an updated extension version or reach out to support.
How do I get support or submit a feature request?
Email us at bboverlay@gmail.com for support, bug reports, or feature requests. We read every message and use your feedback to shape upcoming releases including the MLB overlay.

Stop drafting
blind.

PGA and NFL overlays available now — free to start, no card needed.

⚡ See Our Products