Your Best Ball Portfolio, your data
Exposure alone doesn't tell the full story. rosterOS layers value, structure, and correlation so you can evaluate your portfolio like a real decision system. Your draft history is your competitive edge. rosterOS is designed so uploaded CSVs are processed locally in your browser and not uploaded to rosterOS servers.
Features
Portfolio Dashboard
Get a full view of your best ball portfolio in one place. See your player exposure, team construction, and positional distribution across every draft in your history. The dashboard surfaces the patterns that are easy to miss when you are evaluating drafts one at a time, so you can see your portfolio as a whole and make adjustments with the full picture in front of you.
My Players
Drill into your player-level exposure across tournaments and date ranges. Understand where you are concentrated, where you are light, and how your player decisions are trending over time. Filter by position to spot imbalances quickly and compare your exposure to how you intended to build heading into the season.
My Teams
Evaluate your team-level construction and stack tendencies across your entire portfolio. See which teams you are overweight on, how your stack distribution compares to your plan, and whether your team exposure is creating correlation upside or concentrated risk. Good best ball portfolios are intentional at the team level. My Teams makes that easy to see.
Charts and Trends
Track how your portfolio is shifting in real time through clear trend and distribution views. Concentration risk, positional drift, and overexposure become visible early, giving you time to adjust before those small deviations compound into expensive mistakes. Charts and Trends turns your running draft history into a feedback loop so every session informs the next one.
How It Works
How It Works
Step 1
Upload your Underdog draft export. rosterOS processes it locally in your browser. No account required and no data leaves your device.
Step 2
Segment your portfolio by tournament, date range, and position to focus on the decisions that actually move results. Filter down to exactly the slice of your history you want to evaluate.
Step 3
Evaluate player-level value and team-level construction together to surface overexposure, timing mistakes, and stack gaps. See where your portfolio is working and where it is leaving edge on the table.
Step 4
Refine your draft plan and apply it immediately in your next session. Use the rosterOS Chrome extension to bring your portfolio context directly into the draft room, with full access to every feature at no cost.