Grepiac Bridge

Sync your Garmin with Grepiac over the USB cable — no Garmin Connect in between.

Support is added device by device, as we test each one — if Bridge doesn't recognise yours yet, Report a problem inside the app is how it gets added.

Download for Mac version 0.34 · macOS 13 or newer

What’s new: A long sync now counts as it goes — 'Uploading activity 7 of 25' — instead of just spinning.

What it does

Plug your watch or bike computer into your Mac and press one button:

Nothing is ever deleted from your device, and Bridge only writes to the folder Garmin reserves for incoming files.

Setting up

  1. Switch on device sync. Log in at grepiac.com → Settings → Privacy & consent → turn on Device sync. Bridge will not touch your watch until you do. That is deliberate: it is your data and your permission. Want your daily health data (steps, resting HR, stress, breathing) synced too? Turn on “Read daily health data from my device” on the same page — it is separate on purpose, and activities sync fine without it.
  2. Install. Open the download and drag Grepiac Bridge into your Applications folder.
  3. First launch: open it from Applications like any other app. It is signed and notarized by Apple, so there is no warning to click through.
    No window will appear — that is correct. Bridge is a menu-bar app: it has no window and no Dock icon. It is now the small bolt at the very top of your screen, in the row with the clock and the wi-fi symbol.
  4. Sync. Click that bolt to open Bridge, sign in, plug in your device with a data cable, choose your name in the Account box, and press Sync now.
  5. When it tells you to, unplug the cable. Most Garmins never appear in Finder, so unplugging is how they “eject”. If yours does show up in Finder as a GARMIN disk, Bridge ejects it for you at the end of the sync — unplug once it says so. Your workouts land a few seconds later under Training → Workouts.
“I installed it and nothing happened — where is it?” At the top of your screen, not in the Dock and not in a window. Bridge lives in the macOS menu bar, the strip along the very top edge next to the clock, battery and wi-fi. Look for the small bolt and click it. If it is not there, open Applications and launch Grepiac Bridge again — it will reappear up there rather than opening a window.
Still on an older build (0.31 or earlier)? Those were not yet signed, so macOS blocks a plain double-click with “cannot check it for malicious software”. Right-click the app → Open → Open gets you in once; Bridge then updates itself to the signed build and the warning never comes back.

The permission screen, explained

When you press Sign in to Grepiac in the app, Bridge opens your browser and sends you to grepiac.com. That is not a glitch — it is how the app asks your permission without ever seeing your password. You approve each permission by name:

Approving a permission on this screen is not the same as the consent switches in step 1: the screen authorises the app, the switches authorise the data. Bridge needs both, which is why a freshly installed app can still say “device sync is switched off” — that message means step 1, not this screen.

You can revoke the app’s access at any time from Connected apps in your account — Bridge loses access immediately, and nothing on your watch or in your account is deleted. If Bridge was updated and asks you to reconnect, the same browser screen appears once more; that is normal.

Making room on your watch

This is the one thing that quietly stops workouts arriving, and it is worth two minutes before your first sync.

Your watch holds a limited number of workouts — on a Fenix 7X we measured the ceiling at 25 files. When it is full the watch simply refuses new ones. It does not announce it, and Bridge cannot force it.

The confusing part: you open Training → Workouts, count four, and assume there is plenty of room. Part of the library is taken by Garmin’s own preloaded workouts — Tabata, strength, Pilates, yoga — and those cannot be deleted from the watch or the Connect app (we tried every route). So the room you actually have is smaller than the ceiling: on that Fenix, 18 slots.

What does free space is deleting the sessions Bridge sent you that are now in the past — the ones named with a day, like 18Tue Easy bike. Unlike the factory workouts, these delete:

Bridge only sends the week ahead, so a week’s worth of room is all you need. Do the deleting through Garmin’s own screens, not by removing files over the cable — the watch keeps its own index and a file deleted behind its back can leave that index stale.

Deleting activities does not help. Recorded activities and workouts live in separate places with separate limits. Clearing old rides frees storage but not a single workout slot.

Bridge warns you when the folder is filling up, and tells you afterwards if the device refused anything — so you are never left guessing.

If something goes wrong

Version 0.34 & build notes

0.34 · 2026-10-04 — A long sync now counts as it goes — 'Uploading activity 7 of 25' — instead of just spinning.
0.33 · 2026-10-01 — Bridge now names the sports it is leaving off a device (e.g. swims on an Edge), and tells one account's health data apart from another's more strictly.
0.32 · 2026-10-01 — The right-click-to-open step is gone: Bridge is now signed and notarized by Apple, so it opens like any other Mac app. Nothing else changes.
0.31 · 2026-09-24 — If your Garmin is set to Garmin USB mode, Bridge now says so and tells you how to switch it to MTP, instead of just 'No Garmin connected'. Problem reports now show each device's USB mode.
0.30 · 2026-09-23 — Older Garmins that show up in Finder as a GARMIN disk (such as the Fenix 6) now sync, and Bridge ejects the watch at the end of each sync so it imports your new workouts. Report a problem now sends straight to Grepiac from the footer, even when Bridge can't see your watch.
0.28 · 2026-09-18 — Rest days and calendar notes now show in your week without being sent to the watch. The health line reports whether today is captured for you, whichever device is plugged in — plugging in an Edge no longer says it is not. Plugging in a different family member's Garmin now switches the panel to their week.
0.27 · 2026-09-08 — Updates are now checked against a checksum the publisher names, and refused if the download does not match. Nothing else changes.
0.26 · 2026-09-07 — Choose which sports go to each device, right in the panel. Tap the sport chips under your watch's name — an Edge offers bike only, because that is what it can run. Until now this needed the command line.
0.25 · 2026-09-06 — A recording you deleted on Grepiac now stays deleted — Bridge says so plainly instead of calling it a duplicate, and never re-imports it. Also: the download page now explains that Bridge has no window and lives as a bolt at the top of your screen.
0.24 · 2026-09-06 — Sign-in now works on any Mac — until this release it only ever worked on the machine Bridge was built on. Delivered workouts are no longer mis-reported as refused and re-sent on every sync. The plan horizon is now a week, which fits what a watch can actually hold, and you can choose which sports go to each device.
0.23 · 2026-09-03 — When an update adds a permission, Bridge now asks for it right away — one browser prompt, and cancelling costs nothing.
0.22 · 2026-09-03 — After an update adds a permission, the panel now says so and offers Reconnect — instead of a green account and a feature that silently does nothing.

Bridge updates itself. When a new version is out you will see a note in the app — one click installs it, and you stay signed in.

Windows planned

Bridge is Mac-only today. A Windows version is planned and is expected to be more straightforward than the Mac one, because Windows can talk to Garmin devices natively. We will not promise a date until it has been tested on real hardware.

Early test build. Rough edges are expected — telling us about them at info@grepiac.com is the point.