Name: Best Splits
Rating: 3.5 (2 reviews)
Author: alphalima

Best Splits finds the fastest rolling window for up to five distances during any running activity and shows them live on your data screen. Pick any five from: 

800 m · 1 km · 1 mi · 3 km · 5 km · 5 mi · 10 km · 10 mi · 20 km · half marathon · marathon

Garmin Connect reports your all-time Personal Records for these distances, but only when you actually set a new PR — the rest of the time you have no ideahow close you were. Best Splits fills that gap by computing your fastest 1 km, 5 km, 10 km (etc.) of this run, every run, whether it's a PB or just an easy Tuesday recovery.

How it works: 
- As you run, the field records a sample every 25 metres of forward progress.
- A rolling-window algorithm continuously finds the fastest window for each target distance reached so far. Rows populate as you cross each target.
- The window's left endpoint is linearly interpolated between samples, soreported splits land within a second of the per-second-record truth — no over-counting from coarse sample boundaries.
- At the end of the activity, each best time is written into the FIT file as a session-summary field, so it shows up in Garmin Connect's activity details alongside pace, HR, etc. 
- A history of recent activities' bests is kept in on-watch storage.

Settings: five slot dropdowns, one per row. Pick the distance for each slot (or "none" to leave a slot empty). Slot order is row order on the watch. Defaults to 1 km / 5 km / 10 km / half marathon out of the box; switch any slot to marathon, 800 m, mile-based distances, etc. via Connect IQ on your phone.

Recommended layout: a single-field screen so all rows are visible at once. The field is round-bezel-aware and tuned for MIP displays.

If Best Splits is useful to you, tips are appreciated at https://buymeacoffee.com/alphalima — entirely optional, the app stays free regardless.