Amateur cyclist
You train 3–5 times a week and want to know if it's working. WattLog.pro shows whether your fitness is building or stalling — and why. No spreadsheets, no guesswork.
WattLog.pro is a training tool for cyclists who want to understand their sessions — not just log them. Ride straight from Chrome or install the app, connect your smart trainer, and let it handle the data.
You train 3–5 times a week and want to know if it's working. WattLog.pro shows whether your fitness is building or stalling — and why. No spreadsheets, no guesswork.
Your athletes collect data but you struggle to make sense of it across many accounts. WattLog.pro organises metrics so you can see at a glance who is ready to push and who needs rest.
You already have tools but want something without a subscription that keeps your data yours. WattLog.pro is a tool, not a platform with a paywall.
Install WattLog.pro on macOS, iOS, or Android and launch it — that's it. On desktop, keep it running in the background while you ride. Works with Wahoo KICKR, Tacx NEO, Elite Suito and any smart trainer.
Create a free account — or just continue as a guest — then open WattLog. Click Connect, pick your trainer and heart rate monitor from the list, and you're ready to ride.
Power (W), heart rate (bpm), cadence (RPM), current power zone and interval timer — all visible during the session, logged every second. After the ride you get the full picture, not just summary numbers.
After every ride you get a short report in plain language: how hard the ride really was, how much training it added to your week, and whether your heart started to struggle before your legs did.
Behind the report: WAPWeighted Average Power: the steady power that would cost your body the same as this ride, surges included., RIRelative Intensity: how hard the ride was compared with your FTP. 1.0 means riding at threshold., TLSTraining Load Score: one number for how much training a ride gave you. One hour at your FTP scores 100. and cardiac drift. In the app every number has its explanation right next to it.
One weekly chart answers three questions: are you getting fitter, how tired are you, and are you fresh enough for a hard session today?
It's the PMCPerformance Management Chart: fitness, fatigue and form, week by week.: CTLFitness: your average daily training load over roughly the last six weeks. is your fitness, ATLFatigue: your average daily training load over the last week. your fatigue, and TSBForm: fitness minus fatigue. Above zero you're fresh; well below zero it's time to rest. the difference between them — your form right now.
Two ways. In Chrome or Edge on a computer — Windows, macOS, Linux or ChromeOS — WattLog.pro talks to your trainer straight from the browser, with nothing installed. Or install the native app for macOS 11+ (Apple Silicon only), iOS and Android.
Safari and Firefox have no Web Bluetooth, and neither do browsers on iPhone, iPad or Android — those need the app. Native Windows and Linux apps are on the roadmap; let us know if you want yours prioritised.
WattLog.pro works with any Bluetooth Smart (BLE) trainer that broadcasts power data — wheel-on and direct-drive alike. If your trainer connects to Zwift, TrainerRoad or Wahoo's app via Bluetooth, it will work with WattLog.pro.
Tested and confirmed: Wahoo KICKR series, Tacx NEO series, Elite Suito, Saris H3. If your trainer isn't on the list, there's a good chance it works anyway — reach out and we'll confirm within 24 hours.
No — heart rate is optional. WattLog.pro works fine with power data only. That said, pairing a heart rate monitor unlocks cardiac drift analysis and the HRV-based readiness score, which are some of the most useful features for understanding how your body is actually responding to training.
Any Bluetooth Smart HR strap works: Garmin HRM-Pro, Polar H10, Wahoo TICKR, or your existing chest strap or optical sensor.
Your data is yours. WattLog.pro stores your session history on our servers so it's available across devices, but we never sell it, share it with third parties, or use it for advertising. You can export everything as TCX or FIT at any time and delete your account — along with all associated data — whenever you want.
We don't track you across the web. The only analytics we collect are basic usage events (session started, workout completed) to understand which features matter most.
During a session: Power (W), heart rate (bpm), cadence (RPM), current power zone, interval timer, elapsed time, distance equivalent.
Post-ride analysis: Weighted Average Power (WAP), Relative Intensity (RI), Training Load Score (TLS), cardiac drift %, time-in-zone breakdown, power PRs (1 min / 5 min / 20 min / 60 min).
Across weeks: Chronic Training Load (CTL), Acute Training Load (ATL), Training Stress Balance (TSB) — the three numbers that tell you whether you're building fitness or digging a hole.
Every metric includes a plain-English explanation inline. No need to google what RI means at midnight.
Yes — WattLog.pro is free for everyone. Core training tools, session history, FTP detection, and the Performance Management Chart are all available at no cost. No trial period, no credit card required.
Download WattLog and start training today.
If WattLog.pro saves you time or helps you train smarter, a coffee goes a long way — it funds the next feature.