MultiLap Stopwatch vs PoseAnalyzer Motion Analysis

MultiLap is a stopwatch app that times laps for many people at once on a single phone. No more juggling several stopwatches or copying times onto paper. WHO IT'S FOR • Managers and coaches of track, relay and swim teams at schools and clubs • Anyone who times several athletes at once during practice and shares the results afterwards FEATURES ■ One card per athlete Create a card for each athlete, each with its own independent stopwatch. Each screen holds up to 50 cards. ■ All-card and group controls The control bar at the top runs Start, Stop, Lap and Reset for everyone at once. "All Start" uses the moment you tap as a shared origin, so every card it starts begins at exactly the same instant. Put cards into a group, and the group header runs the same controls for that group only. ■ Target laps Set how many laps to run and each card shows progress such as "3/5". The badge turns green when the target is reached, and timing keeps going beyond it. ■ Review your laps Among the completed laps, the fastest is shown in green and the slowest in red. Tap the time on a card to see the full lap list. ■ Three screens Switch between Standard (one easy-to-read card per row), Mini (two columns for a wider overview) and Rich (cards with photos). ■ Templates Save a lineup you use often (names, colors, order and groups) and recall it next time. ■ Share and save on the spot Share results as CSV, TXT or copied text. CSV opens in spreadsheet apps. You can also save results on your device and review them later. BUILT TO BE RELIABLE • Timing stays accurate even if you close the app or lock the screen, because it is calculated from real elapsed time • An option keeps the screen on while timing • No network access and no account. Your data is never sent to any server or third party • Collects no personal information or usage data AVAILABLE IN • English / Japanese • Dark and light themes • iPhone and iPad

PoseAnalyzer is a motion analysis app for physical education and sports coaching. From videos you shoot on your iPhone or iPad, it computes a person's skeleton, joint angles and center of mass (CoM) on the spot. All analysis runs on the device. Videos and data are never sent to external servers. ■ Shoot, select, analyze ・Record a trial and it appears in the list right away. ・Choose the range to analyze (start and end), then tap the box around each person you want to analyze (you can pick several). ・Only the selected people are tracked, so others in the frame never get mixed up. ・Analysis runs in the background. You can watch videos or record the next trial while you wait. ・If you stop an analysis midway, you can still see the results so far. ■ Quick result right after recording Skeletons estimated live during recording are shown with graphs as soon as you stop. When you analyze every frame later, they are replaced with the accurate result. ■ Result correction Fixes swapped left/right legs, removes outlier points, fills hidden points from neighboring frames, and smooths the motion. You can switch back to the uncorrected result at any time to compare. ■ What you can see ・Skeleton (26 Halpe-26 keypoints, including toes and heels) ・Joint angles (elbows, knees, shoulders and hips, left and right; knees are measured on the back side) ・Center of mass and its trajectory ・Graphs: show one or two of position, velocity, acceleration and joint angles (for the CoM or any keypoint) ・Frame stepping (also by tapping the screen edges), 0.1–2.0× speed, range looping, pinch to zoom ■ Real-length calibration Calibrate with two points of known length (for height: top of the head and the feet) or with the four corners of a rectangle on the floor and its diagonal, and position, velocity and acceleration are shown in m and m/s. ■ Center of mass fitted to the subject The CoM is calculated with body segment parameters that match the subject's age group, build and sex. Children's heads are relatively heavy, so adult parameters would place their CoM too low. ・Ages 3–15: Yokoi et al. (1986) (by build; by sex from age 9) ・Ages 16–18 and adults: Ae et al. (1992) ・Older adults: Okada et al. (1996) You can change the subject for each trial after analysis, and the CoM is recalculated immediately. ■ Export ・Video with the skeleton overlaid (saved to Photos), optionally with graphs and the original audio ・CSV (one row per frame: 26 keypoints with confidence, 8 joint angles, CoM) ・JSON (video information and data for every frame) ・The original video ■ Camera ・30 / 60 / 120 / 240 fps (as supported by the device) ・Standard and ultra-wide lenses, manual focus ・Live skeleton and CoM while shooting (up to 3 people) ・Delayed playback (shows the scene from 3–20 seconds ago, so athletes can check their own movement right away) ■ About the measurements Angles and the CoM are measured in the image plane as seen by the camera. Motion toward or away from the camera is not reflected. Real-length calibration is an approximation that assumes motion in a plane parallel to the camera. If you use the values for research or assessment, please keep these properties in mind. ■ Privacy All videos and results are stored on your device. No account is required, and nothing is sent to external servers.