Every week, a handful of lineup calls decide whether you win. Fantasy Football Codex weighs injuries, matchups, market signals, weather, usage, and travel to find the lineup with the best chance to win — built for your league's format, Flex and Super Flex included — and tells you how confident to be in every call.
Supports Season-Long and DFS Categories | PPR - Half-PPR - Standard Scoring
No Credit Card Required To Get Started
You're making your biggest decision of the week with 10 browser tabs open and no clear answer.
Real signals for your roster — not generic rankings.
*Example output
Elite matchup — 39.2 pts allowed vs DAL. League projected 9.4 pts.
Favorable matchup — 35.5 pts allowed vs TEN. Recent trend: neutral.
Recent trend: neutral. Neutral matchup — 27.9 pts allowed vs KC.
Same engine, both directions
When a starter is a borderline call, expand Alternatives to see who you could pick up. Every candidate runs through the same multi-signal algorithm.
League-aware filtering → Pro & League plans
Most managers glance at a ranking and go with their gut. Fantasy Football Codex weighs injuries, matchups, market signals, weather, usage trends, travel, and projections — then tells you the lineup with the best chance to win, and how confident to be in it.
Practice participation, designation risk, and what it means for your lineup decision.
Fantasy points allowed vs position, with difficulty labels.
Recent week-over-week trajectory, not just season averages. Catches hot streaks early.
Consensus yards lines converted into fantasy point estimates for your format.
Expected game totals, implied team points, and dome vs outdoor scoring context.
League-scoring-aware weekly projection for each player.
Wind, precipitation, and temperature at kickoff.
Home or away, days since last game, and travel distance.
Proof, not promises
Most tools tell you who to start. Fantasy Football Codex tracks whether you listened and quantifies the points left on your bench when you didn't.
*Example output
Recommendations vs your actual results
| Week | Result | Your pts | Start adherence | Bench pts left |
|---|---|---|---|---|
| 4 | L | 143.2 | 80% | 21.1 |
| 7 | L | 128.4 | 67% | 40.0 |
| 8 | W | 156.1 | 100% | 0.0 |
In weeks where you started 75%+ of our START recommendations, your record was 6-5. In other weeks: 1-2.
Over the season, you left 293.3 fantasy points on your bench by not starting players we recommended. That's an average of 20.9 per week.
The same signal engine as season-long — know which games to stack before you fill a lineup.
Captain pressure · Game environment · Portfolio allocation
*Example output
Stack: Strong · game stack
Tournament Value: Strong — game stack upside
Ownership Pressure: Neutral
Ceiling probability 75 supports moderate leverage in a shootout game with strong stack viability.
Lamar Jackson and Caleb Williams project for high captain ownership. Pass-catchers like Zay Flowers and DJ Moore carry chalk risk — Derrick Henry offers contrarian leverage.
Stack: Weak
Tournament Value: Avoid — field too concentrated
Ownership Pressure: Inflated — chalk heavy
Inflated ownership meets a low ceiling profile — chalk is unlikely to pay off.
A grind-it-out defensive battle. High-priced Drake Maye stacks may leave lineups stranded. Jerome Ford or TreVeyon Henderson offer contrarian captain paths.
13 games · Main Slate
| Role | Matchups | Allocation |
|---|---|---|
| Anchor | BUF @ CAR, DAL @ DEN | All 3 lineups |
| Secondary | WAS @ KC, CHI @ BAL, TB @ NO, MIA @ ATL | 2 of 3 lineups |
| Pivot | MIN @ LAC, TEN @ IND, GB @ PIT, NYG @ PHI | 1 of 3 lineups |
| Fade | SF @ HOU, NYJ @ CIN, CLE @ NE | 0 lineups |
Year-round
Roster moves, depth charts, and market signals — not just in-season.
*Example output
On IR — minimum 4 games
9 hours ago
On IR — minimum 4 games
9 hours ago
Los Angeles Rams
13.9%
13.3% → 13.9% (+0.6)
Step 1
Import from ESPN Fantasy, Sleeper, Yahoo Fantasy or build a manual roster in under 2 minutes. Your scoring format — PPR, Half-PPR, or Standard — flows through every signal automatically.
Step 2
The Decision Board runs eight signals for every player on your roster. No setup. No configuration. Just open the board on Wednesday or Thursday and your recommendations are there.
Step 3
START your high-confidence players. Monitor the borderline ones — we show you what to watch for. Borderline starter? Compare league-aware waiver alternatives — each one scored by the same multi-signal engine, with owned players filtered out.
Loading plans…
Pro and League include a 14-day free trial — no credit card required. Cancel anytime.
Everything you need to know about Fantasy Football Codex and our plans.
Sleeper, ESPN Fantasy and Yahoo Fantasy. You can also build a manual roster in under 2 minutes without connecting any platform. Yahoo Fantasy import is currently unavailable and will return soon.
Know the lineup with the best chance to win — before your deadline.
Full Pro-level access, free — in exchange for your feedback shaping the product.
No credit card required · ESPN Fantasy, Sleeper & Yahoo Fantasy · PPR / Half-PPR / Standard