Hit or Not vs Coach Skip

The Hit or Not app is designed to contribute to coach, player, and fan evaluations of plate appearances (PA) in baseball. The app also works great for batting cage competitions. To make this app work, I take all available data from the 2023-2026 NCAA Division 1 baseball seasons, and 2022-2026 MLB seasons.For each 1 mph increment in exit velocity (EV) and 1° increment in launch angle (LA), I count all instances of outs, singles (1b), doubles (2b), triples (3b) and home runs (hr). The user also has the option to select an outfield direction for the hit. I do not provide the option to choose an infield direction, because NCAA data for hit direction on ground balls is too inaccurate. When the user selects 'MLB', they can make an additional choice to evaluate hits in any of the 30 MLB parks. With these counts based on user input of League, hit Direction, Park, EV, and LA, I compute the mean batting average (AVG) and slugging percentage (SLG). These values of AVG and SLG are equivalent to 'expected stats (xBA or xSLG) for balls in play (not including strikeouts). For both counts and percentages, I apply 9-cell neighborhood averaging around each {EV,LA} pair to account for the average Trackman/Hawkeye errors in EV and LA observations. Similarly, the hit Direction bins are sampled with 5° overlap. When the user taps the 'Calculate' button, the app selects randomly from the distribution of out, 1b, 2b, 3b, and hr counts and displays an outcome that simulates some of the randomness in baseball, while respecting the statistics of the user's inputs for League, hit Direction, Park, EV, and LA. The user can tap the 'Calculate' button as many times as they like, with each tap representing a reroll of the dice. We often use this feature when players or coaches challenge a HitOrNot result during an indoor scrimmage. The heat map screen takes the same data used in the dashboard, and plots the user selected grid as a heatmap. This tool allows users to interrogate the differences in {EV,LA} outcomes for different Leagues, hit Directions, and Parks. The about screen allows users to update the data in the map to the most recent week of NCAA and MLB play. Thank you to Joe Haumacher, Kyle Bonicki, Scott Bradley, and the Princeton University Baseball Team.

Every volunteer coach knows the feeling: it is 5:45 on game day, you are standing at the dugout with a clipboard, and twelve parents are watching to make sure their kid does not sit the bench two innings in a row. Again. CoachSkip takes the stress out of lineup management so you can focus on what matters — coaching the kids. THE SMART FILL ENGINE Tap one button and CoachSkip builds your entire lineup for you. It automatically assigns every player to a field position while respecting your league's rules, each player's restrictions, parent preferences, and fair play guidelines. No more scratching out names on a napkin. PITCH COUNTING FROM YOUR LOCK SCREEN New in this release: track pitches without ever unlocking your phone. Start a pitcher and a Live Activity appears on your Lock Screen and Dynamic Island. Tap + to log a pitch, tap – if you miscounted. See the current pitcher, inning count, and game total at a glance. Stand at third base, watch the game, and count — no more digging through your phone between pitches. PITCH COUNT TRACKING WITH REST DAY COMPLIANCE Enter pitches as they happen and CoachSkip handles the rest. It calculates mandatory rest days based on official Little League thresholds, flags when a pitcher is approaching their limit, and enforces no re-entry and catcher-to-pitcher restrictions so you never get caught off guard at a post-game protest. SMARTER MID-INNING PITCHER SWAPS Swap a pitcher mid-inning and CoachSkip handles the field for you. Bring in your left fielder to pitch, and your outgoing pitcher automatically slides into left — exactly like it happens in real life. Your batting order stays untouched. BATTING ORDERS MADE EASY Build batting orders manually, randomize them with a tap, or copy a previous game's order as your starting point. CoachSkip keeps it fair and keeps it fast. FAIR PLAY RULES YOU CAN CUSTOMIZE Set the rules that matter to your league and let the app enforce them for you: Prevent back-to-back bench innings Require every player to rotate through infield and outfield Set maximum bench innings per game Limit how many times a player repeats the same position Protect your starting lineup when you need to WORKS FOR EVERY LEVEL Whether you are coaching Tee Ball, Farm, Minors, or Majors, CoachSkip adapts to your division's rules and roster size. SEASON STATS AT A GLANCE Track attendance, view stats broken down by player or by position, review pitching logs across the full season, and keep a running win-loss-tie record. When the board asks how the season went, you will have the answer. SHAREABLE LINEUP CARDS Generate a clean lineup card and share it with your assistant coach, team parent, or the scorer's table. No more deciphering anyone's handwriting. INTERACTIVE BASEBALL DIAMOND Drag and drop players directly onto field positions using a visual diamond. Mark players absent before the game and CoachSkip adjusts automatically. MULTI-TEAM AND MULTI-SEASON SUPPORT Coach more than one team? Manage them all in one place. Your data syncs across your devices with iCloud so your lineups are always with you — whether you are planning at the kitchen table or standing behind the backstop. Built by a coach, for coaches. CoachSkip is the assistant you wish you had in the dugout from day one. Download CoachSkip and take the clipboard out of coaching. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://jacobforcier.github.io/lineup-pro-privacy