The youth baseball app
every coach needs.
Six43 is a free lineup app built specifically for youth baseball coaches. Build your lineup inning by inning, track every kid's playing time across the season, and show up to game day organized.
- Inning-by-inning lineup grid — see the whole game at once
- Playing time tracker — bench %, position time, season totals
- Pitch count limits and rest-day tracking
- Works on your phone and laptop — same data everywhere
- Share with assistant coaches, read-only or editable
- End-of-season AI player evaluations for each family
“This is amazing! So much better than my old spreadsheets.”
How Six43 works
Six43 is designed to match the way coaches actually think about a baseball game — position by position, inning by inning.
Frequently asked questions
What is the best app for building a youth baseball lineup?
Six43 is built specifically for youth baseball coaches. Unlike generic spreadsheets or overly complex apps, Six43 gives you an inning-by-inning grid where you can fill every position for every inning in seconds. It automatically tracks bench time, warns you about duplicate positions in the same inning, and carries playing time totals forward across the whole season.
How do you rotate positions fairly in Little League?
Fair rotation means making sure no player is always stuck on the bench or always stuck in one position. In Six43, each player's bench percentage is calculated automatically after every game. The Playing Time page shows a breakdown by position — pitcher, catcher, infield, outfield, and bench — so you can see at a glance if someone is getting shorted. You can also set a season-long fielding innings target per player and track their progress toward it.
How do I track playing time in Little League?
Six43 tracks playing time automatically from your lineups. Once you mark a game as Final, the innings each player spent at each position are added to their season totals. The Playing Time page shows every player's bench percentage, a color-coded position distribution bar, and a baseball diamond heat map showing where each player spends most of their time on the field.
Can my assistant coach use the same lineup app?
Yes — Six43 supports multiple coaches on the same team. Go to Settings → Staff and invite your assistant coach by email. You can give them full editing access or set them to View Only, so they can see the lineup without being able to change it. Both coaches see the same lineup in real time.
Does Six43 work with GameChanger?
Yes. In Six43, go to Games → Import, paste your webcal link from the GameChanger mobile app, and your full schedule imports automatically — including game dates, times, locations, and home/away designation. You can also run a Check for updates at any time to see what has changed in GameChanger and selectively apply those changes.
Is Six43 free to use?
Six43 is free for up to 10 games — no credit card required. The free tier includes full access to the lineup builder, playing time tracker, pitching log, player evaluations, and coach sharing. A Pro plan is available for unlimited games.