Build a practice that fits your minutes exactly. A curated drill library with video, automatic and AI-assisted planning that respects attention spans, a live in-game lineup board with pitch counts and league rest rules — built by a coach who's stood on a Tuesday infield wondering what to run.
Practice prep, game-day scorekeeping, and player development — in one app, on your phone, in your back pocket.
Tell it age, focus areas, and total minutes. It picks drills from the library, balances the blocks, and drops them into a timed agenda. Reorder or remove any drill. Share the finished plan as a printable PDF.
Drag players onto a real baseball diamond, swap defensive positions inning-by-inning, set the batting order, and tap a result the moment a kid crosses home — single, double, walk, K. Your stat sheet writes itself.
Pitch count + rest day rules built in. Tap "+1" with each pitch. Choose your league's rules (Little League, USSSA, Cal Ripken/Babe Ruth, or your own) and the app shows each pitcher's daily total, limit and required rest, and warns you before you start a pitcher who needs rest. You stay in charge: an override is recorded with your reason, and every pitch that actually happens can always be logged.
9 or 10 fielders, your call. Toggle between standard 9-player and machine-pitch 10-player layouts (LF, LCF, RCF, RF) right from the field screen.
Every drill: step-by-step instructions, 4–6 coaching points, age range, equipment list, and a YouTube video so you see it run before practice.
Rate each player on eight skills. The roster shows each player's latest ratings, their average and how many skills you have covered; open a player to see the trend for every skill over the season.
Per-player batting — AB, H, HR, RBI, BB, K, SB. Log manually or drop in a GameChanger CSV or PDF and we auto-match to your roster.
Big +1 button as the pitch is thrown. Daily limits and rest days come from the verified rulebook you select for your league age, with the source and effective date shown. If the app doesn't have a verified rule for your division, it says so instead of guessing.
Schedule a practice and the app pings your phone two hours before with the plan title and drill count. One less tab open in your brain.
Set length, age group, and focus — "90 min, 10U, infield" — and Diamond assembles a full practice: a warm-up, as many drill blocks as the time allows, water breaks and a closer, adding up to exactly the minutes you asked for. Edit any block, save as a template, print a copy for the dugout.
Drop in a GameChanger export and we'll match every player to your roster automatically. No copy-pasting into a spreadsheet. No hand-entering at-bats at midnight.
GameChanger: Team Manager → Season Stats → Export CSV. Drop it in Diamond and we parse every player's AB, H, HR, RBI, walks, K's, steals — matched to your roster by jersey number first, then by name.
Share the scorebook PDF from any GameChanger game into Diamond. We read the line score, opponent, date, and every batter row — doubles, triples, HRs, steals, walks, K's — and stage it for your review before saving.
Rows are matched to your roster by jersey number and name. Anything ambiguous — a first initial only, a shortened name, a jersey that disagrees with the name — waits for you to choose. Nothing lands in your stats without your review.
No seats, no per-player fees. Cancel anytime in the App Store or Google Play; your records stay readable and exportable if you stop paying.
Free to download. A few minutes to set up your team. Your first practice plan fits your minutes exactly.