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, the two-minute email below is how it gets added.

Download for Mac version 0.27 · macOS 13 or newer

What’s new: Updates are now checked against a checksum the publisher names, and refused if the download does not match. Nothing else changes.

What it does

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

Your recorded activities come off the device and into Grepiac — with laps, heart rate, power, everything the file holds.
Your planned workouts go the other way, onto the device, ready to follow. Each one is named with its day (18Tue Easy bike) so you can tell which is today’s.
Race courses & team segments you pick on grepiac.com load onto the device too — ride or run the real route before race day, with the climbs on screen and the pacing entirely yours. Race-rehearsal workout sessions (your course at your Power-to-Finish watts) arrive like any other planned session.
Daily health data — steps, resting heart rate, stress, breathing rate — comes along too, if you switch it on (it is off until you do). Your watch only keeps the current day, so plug in daily for a continuous record; a day you skip stays blank, never estimated. Sleep and HRV do not come over the cable — log those in the wellness form if you want them tracked.

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

Setting up

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.
Install. Open the download and drag Grepiac Bridge into your Applications folder.
First launch: right-click the app and choose Open, then click Open on the warning.
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.
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.
When it tells you to, unplug the cable. That is how Garmins “eject” — they never appear in Finder. 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.

Why the right-click? Apple has not certified this app yet, so a plain double-click is blocked with “cannot check it for malicious software”. Right-click → Open tells your Mac you trust it, once. After that it opens normally every time.

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:

Upload activities read from your device;
Read your planned workouts to load onto the device;
Store your device’s daily health data — only acts if you have also switched the health-data setting on above.

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 about 20 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. Most of the slots are taken by Garmin’s own preloaded workouts — Pilates, yoga, strength, flexibility — which do not appear in that list. On one watch, 25 of the 33 files were factory content nobody had ever used.

To free space, delete a handful of workouts you will never do:

On the watch: Menu → Training → Workouts → select → Delete
Or in the Garmin Connect app: Training & Planning → Workouts

Half a dozen is enough for a two-week plan. Do it through Garmin’s own screens, not by deleting files over the cable — removing the file does not always update the watch’s internal index.

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

“No Garmin found” — use a data cable, not a charge-only one. If Android File Transfer is installed it grabs the device on connect; Bridge quits it for you, but give it a moment.
A Fenix must be in MTP USB mode, not Garmin mode.
Give it ~20 seconds after plugging in before expecting the device to appear.
Anything odd — click the bolt, then Report a problem. It writes a short description of your device (model, folders, file counts — no personal data) and opens an email. Drag the file in and send it. That is how we add support for devices we do not own.

Version 0.27 & build notes

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.

0.21 · 2026-09-03 — Race courses and segments you pick on grepiac.com now load onto your device when you sync.

0.20 · 2026-08-22 — The wellness line now ticks when today's check-in is done — read from Grepiac, never assumed.

0.19 · 2026-08-22 — The panel no longer forgets your steps after a restart — the health line loads as soon as sign-in is confirmed.

0.18 · 2026-08-22 — The wellness check-in link is now always in the panel — not only right after a sync.

0.17 · 2026-08-22 — After a sync, one quiet link: log today's wellness — the half your watch can't measure.

0.16 · 2026-08-22 — The capture tick now backfills reliably after updates — and remember: the watch only refreshes its daily file when you unplug.

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.