Ergonaut — Smart Trainer Control

+0.0%

0.0 km/h

0 W

LIVE DATA

TARGET

POWER

CAD

SPD

GRADE

🎵

🦈🦈🦈

▶

Drop video or audio files here

MP4 · MKV · WebM · MOV · AVI
MP3 · AAC · FLAC · OGG · M4A
Select multiple files to queue a playlist

Paste a YouTube video URL or ID.
e.g. youtube.com/watch?v=… or youtu.be/…

Paste a Vimeo video URL or ID.
e.g. vimeo.com/123456789

Paste a direct video URL or stream address.
MP4, WebM, HLS (.m3u8), or any direct video link

Paste a Librivox RSS feed URL to stream a free audiobook.
e.g. https://librivox.org/rss/1234 — find it on any Librivox book page

—W

—BPM

—RPM

—KMH

—W/kg

NOW

—

LEFT

—

ZOOM

—

W NOW

—

LEFT

—

NEXT: —

00:00:00

FTP 250W

BIAS 100%

75kg

—W/kg

⚠ Bluetooth unavailable. Web Bluetooth requires a secure context.
Serve this file via a local server instead of opening as file://
Run: npx serve . then open http://localhost:3000

BLUETOOTH

Click scan — your browser shows a list of nearby Bluetooth devices. Pick one. Ergonaut will auto-detect what it is (trainer, power meter, heart rate, etc.) and connect it. Repeat to add more devices.

FTMS ROWER OPTIONS

Calculate pace from distance
For basic FTMS ergs (e.g. Merach R28) that send distance but not pace. Pace is derived from the rate of distance change. Distance also drives the 3D view position directly so it stays in sync with the erg. Stops the 3D view when rowing stops. Calculate pace from watts
For basic FTMS ergs that report power. Uses the standard rowing formula: pace (s/m) = ∛(2.80 ÷ W). Distance accumulates from this pace each second. Pace and distance both go to zero when power drops to zero.

POWER CORRECTION f(x) = ax⁶ + bx⁵ + cx⁴ + dx³ + ex² + fx + g

USB (CONCEPT2 PM5 / PM4)

Connect a Concept2 PM5 or PM4 directly via USB cable. Chrome / Edge only. The machine must be powered on and in ready or rowing state.

WAHOO KICKR — WIFI / DIRECT CONNECT

For KICKR, KICKR CORE, KICKR BIKE, and KICKR SNAP with Direct Connect or WiFi. Scan auto-discovers the trainer on your local network, or enter its IP manually. Both devices must be on the same WiFi/LAN.

POWER METER OPTIONS

Multiple meter mode

Primary: use one meter, log others to FIT. Average: mean of all connected.

RPM2 CORRECTION up to 6th order polynomial per source · f(x) = ax⁶ + bx⁵ + cx⁴ + dx³ + ex² + fx + g

HEART RATE OPTIONS

Average multiple HR monitors

Rejects monitors >50 bpm from 3s rolling average

Record R-R intervals in FIT file

Single compatible monitor only · disabled when averaging

QZ / QDOMYOS-ZWIFT BRIDGE

Use QZ to bridge a non-standard trainer (Technogym, Peloton, iFit, Bowflex, etc.) so Ergonaut can read power and control resistance.

Required QZ setup (do this before scanning):
1. In QZ → Settings → Virtual Device — enable it.
2. Set Virtual Device type to Indoor Bike (FTMS).
3. Make sure QZ is connected to your trainer first.
4. Then scan here — QZ will appear as a Bluetooth device. Select it.
⚠ If QZ only shows as HR: the Virtual Device is off or set to HR-only in QZ settings.

SIMULATION

Disabled — enable if no real device connected

ADDITIONAL USERS (MAX 4)

Add up to 4 extra users. Each gets their own trainer control, independent GPX position, and a separate FIT file downloaded when they finish.

Loading workout library…

Loading workouts…

Supports .zwo (Zwift workout format).

🗂 Drop .zwo file here or click to browse

ZWO (Zwift)

Send a workout directly to your connected PM5. The erg will switch to the selected workout and wait for you to start rowing.

PRESETS

CUSTOM WORKOUT

Type Splits

Scales all target power values

Used for W/kg and physics simulation

W/KG AT FTP

—

Bike weight: 10 kg fixed

/ 500 m

Rowing threshold pace (mm:ss)

/ 500 m

Ski erg / nordic skiing threshold pace

/ 100 m

Swimming threshold pace (mm:ss per 100m)

Auto-pause

Pause after 3s zero cadence

SEC

Ramp-up time after resume

Max sustainable power (≈ 60-min power)

Anaerobic capacity (typically 10–25 kJ)

BPM

Lactate threshold heart rate

Drag coeff × frontal area

Rolling resistance

Equipment weight

Enable laps / loops

Loop routes restart from the start; out-and-back routes bounce at each end (3D mode)

Road ↔ terrain blend

Distance over which the road surface blends into surrounding terrain

5 m

Use LiDAR when available

Higher quality terrain, but prolongs load times. Uncheck to use SRTM only.

Enable all

Sets all items below to low-quality defaults — for computers with less than 32 GB RAM

Skip LiDAR (saves 100–500 MB)

Terrain crop radius (saves 150–250 MB) Full

500 mFull (40 km)

Terrain resolution reduction None

None2×4×8×16×32×64×128×

Cap rock pool

Split draw calls (Firefox/Mesa fix)

Chunks instanced meshes to stay under 30M index limit — reload route to apply

Tree/grass pool size is controlled by the density sliders in the Scenery section below.

Forest tree number

Number of forest trees relative to default

100%

Tree placement radius

How far from the route trees are placed (rebuilds on Apply)

2.5 km

Scattered tree number

Number of scattered trees relative to default

100%

Grass clump density

Fraction of grass tufts shown near road

100%

Object draw distance

Maximum distance at which trees are visible

2.5 km

Buildings

Show fraction of buildings 100%

Shown to other riders on the same GPX course

⚠ OAuth will not work from a file:// URL.
Concept2 requires an http:// or https:// redirect URI.
Open this file via a local web server — in VS Code install the Live Server extension (right-click index.html → Open with Live Server). The page will be served at http://127.0.0.1:5500/index.html and OAuth will work.

Redirect URI to register at log-dev.concept2.com/developers:

loading…

Not connected

📋 COMPLETE SIGN-IN

After authorizing in the browser tab that just opened, Concept2 will redirect you.
Option A — if the redirect opens this app automatically, close this box and you're done.
Option B — if the redirect shows a blank page or error, copy the full URL from the address bar and paste it below.

Not connected

Upload to Strava

Auto-upload FIT file to Strava when workout ends

Connect Strava to upload workouts and sync activities. OAuth redirect — you will be sent to Strava and returned here.

Upload a previously saved Ergonaut JSON file to Concept2 Logbook.
You must be authenticated (Settings → Concept2 Logbook) before uploading.

📂

Drop JSON file here or browse

Enter the 16-character code shown on the PM5 screen after a workout to mark the result as verified.

Routes from local folders (Cycling / Nordic Skiing / Rowing / Swimming)

Loading routes…

🗺 Drop .gpx or .zip here or click to browse

GPX 1.1 · or ZIP containing GPX + terrain files

ZIP auto-detects: *_SRTM.tif · *_LiDAR.tif · *_Sat.tif · *.pmtiles · pois.json + *.glb — or include an index.json to specify filenames explicitly.

ROUTE PREVIEW

START POINT 0.0 km

Load reversed — ride finish → start

Out & back — merge return leg into single road (removes points within 5 m of the outbound track)

WEATHER & TIME

WEATHER

☀ Clear

⛅ Cloudy

🌧 Rain

START TIME

🌅 Dawn
6am

☀ Morning
10am

🌞 Noon
1pm

🌇 Dusk
5pm

🌙 Night
9pm

GPX ROUTE

🗺 Drop .gpx or click

VIDEO

🎬 Drop video or click

SYNC PARAMETERS

ORIGINAL SPEED (km/h)

—

video plays at 1× when you match this

ROUTE DISTANCE

—

VIDEO DURATION

—

minutes

SPEED CLAMP (min / max video playback rate)

× min — × max

EQUIPMENT

DATE

TIME

DISTANCE

AVG SPLIT

STROKE RATE

AVG HEART RATE

WEIGHT CLASS

PM5 vs UPLOAD COMPARISON

PM5

UPLOAD

Time

Distance

Avg Pace

Avg SPM

ℹ Results posted without a PM5 BLE/USB connection are unverified. Connect the PM5 to receive a verification code.

ENTER PM5 VERIFICATION CODE (from the PM5 screen)

✓ RESULT POSTED

Verify your result in the Concept2 logbook:

CONNECT DEVICES

LOAD WORKOUT

PREVIEW

⚙ SETTINGS

PERFORMANCE

RIDER

ENDURANCE SPORT THRESHOLDS

AUTO-PAUSE & RAMP (WORKOUT MODE)

CRITICAL POWER MODEL

PHYSICS (GPX / ERG MODES)

GPX ROUTE OPTIONS

LOW RAM MODE

SCENERY

MULTIPLAYER

CONCEPT2 LOGBOOK

STRAVA

📁 MANUAL C2 UPLOAD

LOAD GPX ROUTE

ROUTE PREVIEW

WEATHER & TIME

🎬 VIDEO SYNC

ABOUT ERGONAUT

I would recommend these applications for serious training:

What this app offers:

Basic app functions:

🎮 GAMES

🦈 SHARKY ROW

🚴 BIKEY JUMP

⛷️ SKI CHASE

📋 POST TO CONCEPT2