Now free during beta

Smart lineups. Fair play.
Every kid.

LeftFieldLineup helps little league coaches build fair, rule-compliant lineups in seconds — so you spend less time on spreadsheets and more time coaching.

Create Free AccountSee How It Works

No credit card required  ·  Works on any device

Inning 1 — Giants vs. Cubs
P
Jake M.
C
Sam R.
1B
Tyler K.
2B
Noah B.
3B
Liam D.
SS
Mason C.
LF
Ethan W.
CF
Owen H.
RF
Aiden F.
Generated in 0.3s
All rules passed

Built for dad coaches, youth baseball, and little league teams  —  no spreadsheets required

Everything a coach needs

Stop fighting with spreadsheets. LeftFieldLineup handles the hard parts so you can focus on coaching.

⚡

AI-Powered Lineup Generation

Our simulated annealing engine evaluates hundreds of lineup combinations in under a second, optimizing for player skills, positions, and your custom rules.

✅

Rule Compliance Engine

Set mandatory rules — minimum innings per player, bench rotation, key position requirements — and every generated lineup is guaranteed to comply.

↕

Drag-and-Drop Builder

Prefer hands-on control? Use the interactive lineup grid to swap players between positions and innings with simple drag-and-drop.

🖨

Printable Lineup Cards

One click to generate a clean, print-ready lineup card you can hand to your scorekeeper or post in the dugout.

👥

Multi-Team Support

Manage multiple teams from a single account. Switch between teams instantly — perfect for coaches who help with more than one squad.

🌗

Dark & Light Theme

Easy on the eyes in the dugout or the bleachers. Switch between dark and light mode anytime with one click.

Up and running in minutes

No training required. If you can fill out a roster, you can use LeftFieldLineup.

01

Add your roster

Enter players manually or upload your roster from Excel. Set skill ratings and position preferences.

02

Configure your rules

Toggle and tune rules like minimum innings played, bench rotation, and key position limits.

03

Generate a lineup

Hit Generate and get an optimized, rule-compliant lineup instantly. Tweak it manually if needed.

04

Print and play

Export a print-ready lineup card and save the lineup to reuse or compare throughout the season.

Simple, honest pricing

No subscriptions. Pay once per season and you're covered.

All plans free during beta

Season Pass

$5per season
Free during beta
  • ✓1 season of access
  • ✓Up to 2 teams
  • ✓Full lineup generator
  • ✓Printable lineup cards
  • ✓Save & load lineups
  • ✓Rule compliance engine
Get Season Pass
MOST POPULAR

Year Pass

$10per year
Free during beta
  • ✓12 months of access
  • ✓Up to 4 teams
  • ✓Full lineup generator
  • ✓Printable lineup cards
  • ✓Save & load lineups
  • ✓Rule compliance engine
  • ✓Excel roster upload
  • ✓Priority support
Get Year Pass

League Setup

$100per season
Free during beta
  • ✓1 season of access
  • ✓All teams in your league
  • ✓Commissioner dashboard
  • ✓Full lineup generator
  • ✓League-wide rules
  • ✓Player evaluation system
  • ✓Draft board (coming soon)
  • ✓Assistant commissioners
Set Up Your League
⚾

20% of all proceeds go back to Little League

We believe every kid deserves a fair shot at the plate. That's why 20% of every purchase is donated back to local Little League programs — helping communities fund equipment, field maintenance, and scholarships.

Ready to build your best lineup?

Join coaches who've traded spreadsheet headaches for smart, fair lineups every game.

Create Your Free Account

No credit card required  ·  Free during beta