Incredible vs TrainingPeaks: Recorded-Workout Modeling Compared

Incredible is a free training app for iPhone and Apple Watch with strength logging, training-load modeling, and daily training context from sleep and vitals. TrainingPeaks is the industry-standard endurance training platform with coaching tools, workout planning, and the Performance Management Chart (PMC) that popularized CTL/ATL. Both model recorded training at faster and slower rates. They serve very different audiences at very different price points.

At a Glance

Feature	Incredible	TrainingPeaks
Price	Free	Free basic, Premium $19.95/month or $134.99/year
Recorded-load modeling	Faster and slower averages of recorded workouts	CTL/ATL via PMC (Premium only)
TSS/training load	Recorded cardio + strength workout load	Yes
Daily training context	Sleep, vitals, and recorded training	TSB only (training-load based, not biometric)
HRV tracking	Yes (native)	Display only (imports from external apps)
Sleep analysis	Yes	No
Strength training	Yes (gym logging)	Yes (added, but strongest for endurance)
Structured workout builder	No	Yes
Coaching marketplace	No	Yes
Race planning	No	Yes
Body temperature	Yes	No
Blood Oxygen displayed	Yes, displayed separately	No
Respiratory rate	Yes	No
Apple Watch app	Yes (native)	No (syncs structured workouts to native Workout app)
Platforms	iOS/watchOS	iOS, Android, Web
Account required	No	Yes
On-device processing	Yes	No (cloud-based)

The Core Difference

TrainingPeaks popularized CTL/ATL modeling through its Performance Management Chart. The chart plots Chronic Training Load, Acute Training Load, and Training Stress Balance, conventionally labeled "fitness," "fatigue," and "form." Those are model labels for recorded training-load patterns, not direct measurements of the body. Coaches use the chart when reviewing endurance training blocks and tapers.

But TrainingPeaks was built for a specific user: the coached endurance athlete training for a specific event. The platform assumes you have a power meter or GPS device, that your training is primarily cardio, and that you are willing to invest $19.95/month (or $134.99/year) for Premium access. The PMC, advanced analytics, and full planning tools are all behind the Premium paywall. If you are a triathlete with a coach preparing for an Ironman, TrainingPeaks is hard to beat.

TrainingPeaks has expanded to include strength training -- you can now log strength sessions, not just cardio. But the platform's strength is still endurance. Its TSS calculations, structured workout builder, and coaching ecosystem are all optimized for swim/bike/run. Strength training is supported but not the core competency.

Incredible adapts faster and slower weighted averages to recorded cardio and strength workout load. No coaching platform. No event calendar. No power meter required. Fitness is training built over time from recorded workouts. Daily training context brings together how you slept, overnight readings, recent training, and workouts recorded today. Your optional check-in adds personal context. And it is free.

Fitness Modeling

TrainingPeaks pioneered the Performance Management Chart. It conventionally labels its slower training-stress average CTL or "fitness," its faster average ATL or "fatigue," and their difference TSB or "form." These historical names describe modeled training-load relationships, not direct measurements of fitness, fatigue, or physical condition. The chart requires a Premium subscription ($19.95/month or $134.99/year).

The catch: TrainingPeaks calculates training stress primarily from power and pace data. While strength training is now supported on the platform, the TSS (Training Stress Score) calculations remain most accurate for cardio activities where power or pace data provides precise load measurement. A heavy lifting session still generates less precise training stress values than the same duration on the bike with a power meter.

Incredible applies faster and slower averages to its own recorded-workout load. Training Load combines recorded cardio and strength workout load. Both feed the same training state used by Fitness, recent training, and Training Balance, while sleep and vitals add daily context. Fitness reflects recorded training history, not complete physiological fitness.

TrainingPeaks uses power-based TSS for endurance files. Incredible explicitly combines recorded cardio and strength workout load, which gives mixed-modality athletes a different view of their logged training.

Daily Training Context

Incredible brings together Sleep and overnight readings, Recent training, Today’s recorded workouts, and Your check in. This provides daily training context without claiming proof of recovery or prescribing a workout.

TrainingPeaks offers TSB (Training Stress Balance), the difference between its slower and faster recorded-load averages. It describes that mathematical relationship rather than directly measuring someone's physical condition. It does not include sleep or overnight readings in that value. TrainingPeaks can display HRV data imported from third-party apps, but the platform does not combine HRV and recorded load into one daily view.

Experienced athletes and coaches interpret TSB alongside external data. Incredible brings sleep, vitals, recent training, and today's recorded workouts into one view for people who train without a coach.

Strength Training

Incredible includes full strength training logging with Apple Watch control: an exercise library, set-by-set tracking, templates, and muscle group tagging. Completed strength work contributes to recorded workout load, Fitness, and the app's daily training context.

TrainingPeaks now includes strength training support -- a meaningful expansion from its endurance-only roots. You can log strength workouts on the platform. However, the strength experience is still secondary to the endurance tools. There is no dedicated Apple Watch app for gym logging; TrainingPeaks syncs structured workouts to the native Apple Workout app but does not provide a gym-logging interface on the wrist. The platform's structured workout builder, coaching marketplace, and analytics remain most powerful for swim/bike/run.

For pure endurance athletes, TrainingPeaks' strength addition rounds out an already comprehensive platform. For lifters who also do cardio, Incredible's strength-first logging and shared recorded-workout state may be more useful.

Vitals

Incredible tracks six vitals with historical trends: HRV, Sleep Score, Resting Heart Rate, Body Temperature, Blood Oxygen, and Respiratory Rate. Blood Oxygen is displayed separately.

TrainingPeaks does not natively track vitals. It can display HRV data imported from third-party apps, and it accepts some biometric data via syncing services, but it does not have its own biometric tracking or a dedicated Apple Watch app for data collection. The platform is built around training files (FIT, TCX) from bike computers and GPS watches, not wrist-worn biometric sensors.

Accessibility and Learning Curve

Incredible is designed to be understandable without a sports science background. Fitness shows how recorded training has built over time, while sleep, vitals, and recorded workouts provide daily context. The weighted averages run in the background -- you do not need to know the acronyms to read the output.

TrainingPeaks assumes a level of knowledge. Understanding TSS, IF, NP, CTL, ATL, TSB, FTP, and how they interact requires either a coaching background or significant self-education. This is the trade-off of a professional-grade tool: it is powerful but not immediately accessible. Many self-coached athletes pay for TrainingPeaks Premium but only use a fraction of its features because the learning curve is steep.

Pricing

Incredible is free. Every feature -- Fitness, daily training context, strength training, and all six vitals -- is available with no subscription, no account, no ads. Tip jar only.

TrainingPeaks offers a limited free tier (view workouts, basic calendar) and a Premium tier at $19.95/month or $134.99/year. The PMC, advanced analytics, and full planning tools all require Premium. Coaches pay separately for their TrainingPeaks coaching accounts. Over a year, that is $135-$240 for the athlete depending on monthly vs annual billing.

The pricing reflects TrainingPeaks' positioning as a professional coaching platform. If you use it with a coach who builds plans, analyzes data, and adjusts training, the cost may be justified by that ecosystem. If you are a self-coached athlete who mainly wants to compare faster and slower recorded-load trends, $135+/year is a lot for that chart alone.

Privacy

Incredible processes Apple Health data on-device for insights. No account is required, and health data is not sold or used for advertising.

TrainingPeaks requires an account and stores training data in the cloud. This enables coach-athlete sharing, cross-device access, and the third-party integrations that make the platform powerful -- but it means your training data lives on external servers.

Who Should Choose What

Choose Incredible if you want Fitness built from recorded cardio and strength workouts, daily context from sleep and vitals, and a native Apple Watch experience without paying anything. Incredible makes its training-load model accessible without requiring coaching knowledge, a power meter, or a subscription.

Choose TrainingPeaks if you are a dedicated endurance athlete with a coach, training for specific events, and using power-based metrics. TrainingPeaks' structured workout builder, coaching marketplace, race planning tools, and power-calibrated TSS are purpose-built for that use case and remain unmatched in depth. If your training is primarily endurance and you work with a coach, TrainingPeaks' ecosystem justifies the cost. It also supports Android and web, unlike Incredible.