Most training apps ask for swim data you’ll never record. For run-bike-run racing in 2026, AthleteOS is our top pick, with Intervals.icu the best free option and TrainingPeaks the best source of ready-made duathlon plans.
Bias note: we make AthleteOS. We ranked it first for one narrow reason, and we say where it loses below.
Where the Time Goes in a Duathlon
Duathlon is its own sport. It isn’t triathlon with the swim cut out.
Typical formats run 10 km run, 40 km bike, 5 km run for standard, and 5 / 20 / 2.5 km for sprint. Powerman long distance is typically 10 / 150 / 30 km. Check your race’s current rules, since distances change by event.
A published analysis of Powerman Zofingen finishers (Nikolaidis et al., 2019) looked at pacing. It reports the bike’s share of total race time. In the short race (10 km run, 50 km bike, 5 km run), men spent roughly 57% to 58% of race time on the bike. Women spent about 60%. In short: the bike is more than half of your day, and women in this sample leaned on it a bit more.
The same paper found something useful for pacing. Faster duathletes spent relatively less of their race on the bike. They were stronger runners, not just stronger riders. The authors concluded that slower duathletes should cycle slower and run faster. Translation: if you’re mid-pack, don’t burn the bike to gain a few minutes. Save legs for the second run.
The bike is the biggest block. But your first run sets up everything after it.
Two Transitions, Not One
Triathlon has one hard handoff: bike to run. Duathlon has two.
Bike to run first. In triathlon research, running energy cost rose between 1.6% and 11.6% after cycling (Millet and Vleck, 2000). The main change was a more forward-leaning trunk. In short: your legs feel like borrowed legs, and running the same pace costs more fuel.
Now run to bike. Galy and colleagues tested 12 duathletes. Each did 20 minutes of running then 20 minutes of cycling. On another day they did 20 minutes of cycling alone at the same intensity. After the run, the ride showed higher ventilation, a faster breathing rate and a higher heart rate. Blood lactate was significantly higher too. It took 2 to 5 minutes to reach a cardiorespiratory steady state.
Translation: if you charge out of the first run, the bike starts with a smoke alarm already ringing. Give yourself the first few minutes to settle. Don’t judge the ride by how the first 5 minutes feel.
Think of your legs as a phone battery. Run 1 doesn’t just drain a bit. It changes which apps run in the background for the next hour.
An app that only handles the bike-to-run handoff covers half your race. Learn how that handoff works in our brick workout guide, then add the run-to-bike piece.
What to Look for in the Best Training App for Duathletes
We scored every tool on four questions.
- Does it work with no swim data?
- Does it show run load and bike load separately?
- Can it schedule run-bike-run sessions?
- Does it show both sports in one view?
Why separate loads? Running pounds your joints. Cycling doesn’t. One blended number can say “fine” while your shins say otherwise. If you’ve had run injuries, read how to return to training after an injury.
Heart rate and watts don’t speak the same language. A single number hides which sport is carrying the stress.
How the Six Apps Compare in 2026
| App | Price | Run | Bike | Duathlon sessions | Run + bike in one view |
|---|---|---|---|---|---|
| AthleteOS | $19.99/mo or $180/yr, 14-day trial | Yes | Yes | Run-bike-run bricks | Yes, no swim data needed |
| Intervals.icu | Free, or $4/mo Supporter | Yes | Yes | Build your own | Yes, per-sport settings |
| TrainingPeaks | $19.95/mo or $134.99/yr | Yes | Yes | Third-party plans | Generic load number |
| Garmin Coach | Included with compatible Garmin watches | Run coach | Cycling coach | Not found | Separate coaches |
| TrainerRoad | $21.99/mo or $209.99/yr | Check current offering | Core focus | Not found | Cycling-first |
| Runna | $19.99/mo or $119.99/yr | Core focus | Not mentioned | Not found | Run-only |
Prices were checked on official pages on 2026-11-05. Where we write “not found,” we didn’t find it. It may exist.
Price isn’t the point. Fit is.
The Ranked List
1. AthleteOS
Best for: duathletes who want one plan across both sports.
AthleteOS tracks run and bike load separately and doesn’t need swim data. It schedules duathlon bricks in run-bike-run order. It also shows the concurrent load from both sports in one view. We didn’t find a duathlon-specific brick session type in the other tools we checked.
Weakness: it has no community plan marketplace. If you want a named coach’s plan, look at TrainingPeaks. Pricing is $19.99/mo or $180/yr after a 14-day trial.
2. Intervals.icu
Best for: data-minded athletes on a budget.
The free tier includes fitness, fatigue and form tracking with separate zones and settings per sport. Supporter is $4/month and adds an annual plan builder and custom zones. It’s a toolbox, so you build the duathlon structure yourself. See how it compares as a coach.
Weakness: it won’t coach you. You make the plan.
3. TrainingPeaks
Best for: athletes who want a named plan from a duathlon coach.
Its marketplace has many sprint duathlon plans, including Powerman-style ones with brick and double-brick workouts. Endurance Strong sprint plans list weekly loads, for example 3.75 to 6.25 hours a week for beginners. The app itself has no duathlon-specific session type that we found, and the load number is generic. Plan quality varies by author. Premium is $19.95/month or $134.99/year. Free options are in our TrainingPeaks alternatives roundup.
4. Garmin Coach
Best for: Garmin owners who want free, adaptive plans.
It offers run coaches for 5K, 10K and half marathon, a cycling coach, and a triathlon coach. We found no duathlon plan. It’s included with compatible Garmin watches. It stops being enough once you need to balance two sports; here’s where watch-based coaching runs out.
5. TrainerRoad
Best for: duathletes whose bike is the weak leg.
Its focus is cycling, and its pricing page mentions triathlon plans. Check their current offering for running before you buy. At $209.99/yr it’s the priciest here. Compare in AthleteOS vs TrainerRoad.
6. Runna
Best for: run-only goals.
Its pricing page describes running coaching and doesn’t mention cycling. Great if you’re racing a 10K. A mismatch for run-bike-run. Cost is $119.99/yr or $19.99/mo, with a free first week.
How We Ranked These
We used the four questions above, official pricing pages and published feature lists. We weighted combined run and bike load most, because that’s the duathlete’s real problem. We didn’t test each app with a full season of data. Rankings could change if your sport mix or budget differs.
A Case Study: Daniel’s First Powerman Season
Daniel is a composite example, not a real customer. His numbers are illustrative.
Take Daniel, 41, training for a standard-distance race on 7 hours a week. He ran four days and rode two, using a triathlon app that wanted swim data. His load chart showed a flat line, so he assumed all was fine.
In week six his shin flared. The chart had blended his run and bike hours into one number. His run volume had jumped about 20% while the bike stayed steady. In plain words: the total looked calm, but the pounding was all in one sport.
He switched to a tool showing run and bike load separately. He trimmed one run, kept the bike, and added a run-bike-run brick every second week. By race day his shin was quiet. The point isn’t the app. It’s seeing which sport carried the stress.
Seeing load by sport beats seeing a total.
What a Duathlon Week Looks Like
A typical 7-hour week might have:
- Monday: easy run, 45 minutes
- Tuesday: bike intervals, 60 minutes
- Thursday: tempo run, 60 minutes
- Saturday: run-bike-run brick, 2 hours
- Sunday: long ride, 90 minutes
The Saturday brick is the one that counts. Practice run 1 at controlled effort. Then get on the bike calm, not spiked. Given the 2 to 5 minutes your body needs to settle after a run, spend the first few minutes of the ride easy. Our time-crunched athletes guide covers similar weeks. If you also race triathlon, see the Ironman app ranking.
What We Can’t Do That Others Can
AthleteOS can’t match the plan variety of the TrainingPeaks marketplace. It doesn’t have a free tier as generous as Intervals.icu for tinkerers. If you own a Garmin and want plans at no extra cost, Garmin Coach is hard to beat on price.
Who Should Pick What
Use AthleteOS if you want a plan that adjusts across run and bike. Use Intervals.icu if you want free and don’t mind building it. Use TrainingPeaks if a coach’s plan matters more than automation. Start a 14-day AthleteOS trial to see both sports in one view.