Suunto SML Parser

▸GNSS Track & Metrics Viewer

Load a Suunto samples.json to visualize GNSS tracks, event markers, and training stats.

Summary

Idle

Files

No file loaded.

Info

How to use

This app visualizes Suunto activity data: GNSS tracks, event markers, sensor quality, and summary stats. Use it to inspect a workout and get insights into the data that isn't available in Suunto App.

Mode 1: samples.json (from smlzip)

Use this mode for deep, debug-rich data. Upload SML log as samples.json.

Android location: /Android/data/com.suuntoapp/files/smlzip/ (or similar under com.stt.suunto). Look for latest files and unzip samples.json.

Access requires a file manager with external app data permissions because Android restricts these folders (use ADB or apps like CX File Explorer).

Mode 2: Suunto App JSON

Use this mode for the app-exported summary file. You can get it from the Suunto App activity screen: open the three-dot menu and choose Download JSON.

This file can contain less data than SML but is easily available via the Suunto App.

Privacy

This app does not process any data on a server. Everything is processed locally in your browser. It is a fun project by the curious for the curious.

GNSS point
Event marker
10 min
15 min
Every km
Min value
Max value

Map markers

Min/Max markers

Select fields to display.

Event list

    Event details

    Click a dot on the map to view event data.
    GNSS altitude Barometric altitude EVPE EHPE 10 min 15 min