Simulate every lineup, before lock.
DFS Simulator is a daily fantasy lineup simulator and optimizer covering 21 sports and 3 DFS sites, from $19.99/month. Pick a slate, edit projections, simulate, and export site-formatted CSVs. Built for grinders.
See it in 30 seconds
Pick a slate, edit projections, run 10,000 simulated tournaments, export the ranked lineups as a DraftKings CSV.
No signup required to watch. When you’re ready to run your own, start from $19.99/month.
Bring your own site
Site-specific scoring for the three biggest DFS operators.
Largest contest volume
Distinct scoring · softer FLEX
Softer average field
Every slate imports as a DK, FanDuel, or Yahoo CSV — export the ranked lineups in the site's own format, ready to upload.
How it works
Four simulation models
Monte Carlo, correlated multivariate, genetic search, and bootstrap resampling — pick the model that fits the slate.
Locks, blocks, overrides
Pin players to a slot, block teams, edit individual projections, set min/max deviation. The optimizer respects every constraint.
Bring your own projections
Upload a CSV and we'll layer it over the base model — your numbers win, with full audit trail.
Site-specific scoring
DraftKings, FanDuel, Yahoo each have their own scoring system encoded as JSON. Switch sites and projections recalculate.
Three plans
Every plan includes the Monte Carlo sim engine, CSV export, and live-at-lock countdowns. Pick the one that fits your slate volume.
- Pick 1 sport
- DraftKings
- Salary-cap slates only
- Monte Carlo model
- 500 iterations / run
- Pick up to 4 sports
- + FanDuel
- + Draft slates (snake, best ball, snake showdown)
- + Correlated MC model
- + stacking + exposure caps
- 10,000 iterations / run
- All 21 sports
- All 3 sites
- All 4 sim models
- 50,000 iterations / run
- CSV projection upload
- Discord community access
Every sport, one engine
From NBA main slates to Valorant series, the same simulation engine adapts to each sport's roster shape, scoring system, and correlation structure. Explore how simulation applies to your sport:
Strategy, with the math shown
Why averages lose tournaments, how stacking correlation actually works, and when fading the chalk is profitable — the strategy library explains the simulation concepts behind the product.
Read the strategy libraryFrequently asked questions
What is a DFS lineup simulator?
A DFS lineup simulator runs your daily fantasy slate thousands of times with realistic player-score distributions instead of single-point projections. Rather than telling you one "optimal" lineup, it shows how lineups perform across the full range of outcomes — ceiling, floor, and everything between — which is what actually matters in tournaments.
Which sports and DFS sites does DFS Simulator support?
DFS Simulator covers 21 sports — NBA, NFL, MLB, NHL, WNBA, NCAAB, CFB, soccer, tennis, golf, NASCAR, F1, MMA, and major esports titles including League of Legends, CS2, and Valorant — with site-specific scoring for DraftKings, FanDuel, and Yahoo.
What simulation models are available?
Four models: quasi-random Monte Carlo, correlated multivariate Monte Carlo (players' outcomes move together, which is how stacking actually works), genetic search, and bootstrap resampling from historical data. Basic includes Monte Carlo; Pro adds correlated MC; Elite unlocks all four.
Can I use my own projections?
Yes — on the Elite plan you can upload a CSV of your own projections and the engine layers them over the base model with a full audit trail. Every plan supports editing individual projections, locking players, and blocking teams before a run.
Do I need to install anything?
No. DFS Simulator runs entirely in the browser — pick a slate, adjust projections, run iterations server-side, and export site-formatted CSVs ready to upload to DraftKings, FanDuel, or Yahoo.
Ready to simulate?
Pick a slate, tweak your projections, run thousands of iterations, and export site-formatted lineups.