Real people first
We are focused on building apps for people. Everything is focused on what makes you better and we want to hear from you with your thoughts.
About
A small company for achieving big goals.
Endurance Bytes LLC is a California company. This app exists because I wanted a marathon plan that didn't leave me guessing with a full-time job, a family, and weeks that do not look like a training camp.
Why We Started All of This
I have always wanted to run a marathon. The plans I found online felt generic. When a week went sideways, or the goal stopped feeling honest, I was stuck guessing what to do next. Hiring a dedicated coach felt intimidating, and like overkill. Even a coach-built plan often looked like a formula, with a thin slice of their time.
I wanted the science those plans are based on, written so it is approachable, and built to bend when life happens. Realistic goals. Real calendars. Not a spreadsheet that assumes you have nothing else going on.
Our first product is RunCoachSync. I want to make endurance training easier to start and kinder to stick with while having the quality to reach your real goals safely.
We are not a social network, a marketplace, or an ad business. If a feature needs your data on our servers to work, we will say so. We are focused on the rich ecosystem you already own with Apple gear and using the high quality data they already locally have.
Built next to a real runner
I have a full time job, a wife, and a child. The software had to work in that life, or it was not worth building.
My wife is an accomplished runner. She has finished all of the current major marathons and holds several recognitions. She is a large part of why this exists and my inspiration. Being beside her is what taught me what real runners actually need, not just the numbers on a spreadsheet.
For me, as of September 2026 I am about to enter the marathon-specific phase of a plan the app built for me. Base, build, and maintenance are done. I have stayed injury free, and my running has come a long way. I am on track for my goal pace, aiming at my first marathon on January 10, 2027.
How we work
Say the hard parts plainly
Plans are estimates. Fitness estimates are informational. Medical decisions belong with a clinician, not an app. We are here to guide you but be honest about what we are stating.
Built for Apple
iPhone, Apple Watch, Apple Health, and private iCloud. That is the product, we are building the app Apple first to give you the best experience with the tools you already use.