For COROS Runners
The marathon training app built for COROS.
SUB is the goal-driven companion app for COROS Pace 3, Apex 2 Pro, and Vertix 2 runners. Connect your COROS account once. Activities sync with full running dynamics: stride length, vertical oscillation, vertical ratio, ground contact time, and lap-by-lap detail.
Pick a marathon goal (Sub-3, Sub-3:30, Sub-4) and SUB calculates per-kilometre target pace. Coach-assigned workouts auto-complete the moment your COROS syncs.
Supported COROS watches
- COROS Pace 3
- COROS Pace 2
- COROS Apex 2 Pro
- COROS Apex 2
- COROS Vertix 2
- COROS Vertix 2S
Any COROS watch that records activities to your COROS account is supported. Running dynamics depth varies by model — Apex 2 Pro and Vertix 2 expose the deepest metrics.
What SUB reads from your COROS run
- Activity-level: distance, time, average pace, average heart rate, max heart rate, cadence, calories, elevation gain.
- Running dynamics (when recorded): stride length, vertical oscillation, vertical ratio, ground contact time.
- Lap-by-lap detail: per-lap distance, time, average pace, heart rate, cadence, calories.
- Account identity: preserved across watch swaps and account changes.
How SUB compares to COROS Training Hub
| COROS Training Hub | SUB | |
|---|---|---|
| Log activities | ✓ | ✓ (auto-sync) |
| Running dynamics | ✓ | ✓ |
| Marathon goal pace calc (Sub-3, Sub-4) | — | ✓ |
| Race finder (worldwide) | — | ✓ |
| Coach-assigned workouts (auto-complete) | limited | ✓ |
| Multi-watch dedup (Garmin + COROS) | — | ✓ |
| Price | Free | Free |
| Subscription | — | — |
How to connect COROS to SUB
- Download SUB: Download SUB from the iOS App Store or Google Play (free).
- Open Settings → Connect COROS: In SUB, go to Settings, then Connect COROS.
- Connect: Connect your COROS account.
- Wait for backfill: The first sync backfills the past 90 days of runs with lap data and running dynamics.
- Pick a marathon goal: Choose Sub-3, Sub-3:30, Sub-4, or any goal from Sub-5 to Sub-3. SUB calculates your per-kilometre target pace.
- Done: Runs auto-sync every few hours. Coach-assigned workouts auto-complete on sync.
Marathon goal paces for COROS runners
Set these as your COROS pace alerts. SUB calculates per-kilometre target pace based on your goal and the matching race date.
- Sub-3 marathon (4:15 / km, 6:52 / mile): elite-amateur goal. Sub-3 plan →
- Sub-3:30 marathon (4:58 / km, 8:00 / mile): advanced goal.
- Sub-4 marathon (5:41 / km, 9:09 / mile): popular milestone. Sub-4 plan →
- Sub-5 marathon (7:06 / km, 11:26 / mile): first-marathon goal.
Frequently asked questions
What is the best app for COROS Pace 3?
SUB. SUB is the goal-driven marathon training app for COROS Pace 3 runners. Activities auto-sync from your COROS account with full lap detail. Pick a Sub-3, Sub-3:30, or Sub-4 marathon goal and SUB calculates the per-kilometre target pace. Coach-assigned workouts auto-complete the moment a matching run lands. Free on iOS and Android.
What is the best app for COROS Apex 2 Pro?
SUB. SUB supports COROS Apex 2 Pro including full running dynamics (stride length, vertical oscillation, vertical ratio, ground contact time). Activities auto-sync from your COROS account, and SUB calculates marathon target pace and auto-completes coach-assigned workouts.
What is the best app for COROS Vertix 2?
SUB. SUB supports COROS Vertix 2 with full running dynamics and lap-by-lap detail. Pick a marathon goal (Sub-3, Sub-3:30, Sub-4) and SUB calculates per-kilometre target pace. Coach workouts auto-complete on watch sync.
How do I connect COROS to SUB?
Open SUB, go to Settings → Connect COROS, and link your COROS account. The first sync backfills 90 days of runs with full lap data and running dynamics. Subsequent runs auto-sync within hours.
Is SUB a better alternative to COROS Training Hub for marathon training?
COROS Training Hub is a logging and analytics tool. SUB adds the goal-driven training layer: pick a Sub-3 / Sub-3:30 / Sub-4 marathon goal, get per-kilometre target pace, find matching races, and let coach-assigned workouts auto-complete when your COROS syncs. SUB does not replace COROS Training Hub — it adds what is missing.
Does SUB read running dynamics from COROS?
Yes. When your COROS watch records them (typically Apex 2 Pro and Vertix 2), SUB reads stride length, vertical oscillation, vertical ratio, ground contact time, and lap-by-lap detail. SUB shows them in the activity tile and feeds them into coach analysis.
Can I use COROS and Garmin together with SUB?
Yes. Connect both your COROS account and Garmin to the same SUB account. SUB intelligently deduplicates: monthly and weekly mileage take the maximum across sources (never the sum), so totals stay honest when you wear both watches on the same run.
Is SUB free for COROS users?
Yes. SUB is free on the iOS App Store and Google Play. No subscription, no in-app purchases, no ads. The COROS integration is included.