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Smart Lineup Engine
Powered by simulated annealing, our engine generates fair, optimized lineups that respect your league rules and maximize player development.
Trusted by Little League coaches across the country
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Teams Created
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Lineups Generated
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Leagues Running
For Coaches
Everything You Need to Coach
Stop fighting with spreadsheets. LeftFieldLineup handles the hard parts so you can focus on coaching.
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Roster Management
Add players manually or upload your roster from Excel. Track skills, positions, and player development all season.
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Player Skill Ratings
Rate your players on batting, fielding, throwing, catching, and speed. The engine uses these ratings to put the right player in the right spot.
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Position Optimization
Customize skill weights per position to fine-tune how the engine scores player fit, division by division.
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Coaching Staff
Invite up to 6 coaches per team. Collaborate on lineups, share scouting notes, and manage your roster together.
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PDF Export
Print your lineup card and hand it to the umpire. Clean, professional game sheets ready for the dugout.
For Commissioners
Run Your League Like a Pro
Draft system, player evaluations, league-wide rules — everything a commissioner needs in one platform.
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League Draft System
Run snake or linear drafts with real-time pick clocks, auto-draft, and a post-draft trading window.
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Draft Board Prep
Coaches prepare for the draft with personal tier rankings and shared team scouting notes.
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Player Evaluation System
Dual rating system — league evaluations from the commissioner and private coach ratings for each team.
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Player Pool Management
Build your league player pool, designate hat picks, and manage evaluations before draft day.
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League Rules Engine
Set mandatory league-wide rules that automatically apply to every team. Innings limits, bench rules, position requirements.
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Leagues & Divisions
Build a league of divisions, set each division's age band, innings and positions, and add teams — inviting a head coach whenever you know who it is.
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Field Permits
Import the permit PDF your city or school district sends you. The dates, times and fields are read out of it and become bookable inventory.
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Practice & Game Scheduling
Drag practices and games onto the field time you actually hold. Double bookings are impossible, and auto-fill proposes practice slots for teams under their weekly target.
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Commissioner Dashboard
Full control over divisions, teams, players, rules, scheduling and drafts from a single dashboard.
Up and Running in Minutes
No training required. If you can fill out a roster, you can use LeftFieldLineup.
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Create your team or league
Sign up free, name your team, and configure your division settings.
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Add players and rate skills
Enter your roster manually or upload from Excel. Rate each player on batting, fielding, throwing, catching, and speed.
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Set rules and generate lineups
Configure your league rules, hit Generate, and get an optimized, fair lineup in under a second.
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Print and play
Export a clean lineup card, hand it to the scorekeeper, and focus on coaching.
For leagues: Commissioners build the player pool, run the draft, and teams get their rosters automatically.
What it costs
Free for your league
LeftFieldLineup is free to use. Every feature on this page is included for every coach and every commissioner — no tiers, no seat counts, no card.
LeftFieldLineup is currently in beta — we are adding to it every week.
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20% Goes Back to Little League
We believe every kid deserves a fair shot at the plate. That's why 20% of all proceeds go back to local Little League programs — helping communities fund equipment, field maintenance, and scholarships.
Built by Coaches, for Coaches
“Finally, a lineup tool that actually understands Little League rules. My kids are getting fair play every game.”
Coach Mike
Northside Giants
“The draft system blew our minds. Running our league has never been this organized.”
Commissioner Sarah
Westfield LL
“I used to spend hours on spreadsheets. Now I generate a lineup in 30 seconds and hand it to the ump.”
Coach Dave
Eastside Cubs
Ready to Build Your Best Lineup?
Join coaches who've traded spreadsheet headaches for smart, fair lineups every game.
Create Your Free AccountNo credit card required · Every feature included