About Diby

The coaching system for fitness coaches

Diby helps fitness coaches manage clients, programs, progress, and payments in one simple system — so they can grow without losing the personal touch that makes their coaching work.

Our story

Diby was built by and with fitness coaches who were tired of running their business across spreadsheets, DMs, and a stack of disconnected tools. We saw great coaches capped not by their coaching, but by the admin around it.

So we set out to build one simple system that handles clients, programs, progress, and payments — so coaches can focus on coaching and grow without hiring a team.

Proven scale-up leadership

Stjepan Buljat

The Architect

Stjepan BuljatCo-founder & CEO

  • Ex-Cognism: Co-founder & CTO.
  • The Win: Scaled technology from $0 to $80M+ ARR.
  • Superpower: Enterprise velocity & systems.
Mario Vidović

The Builder

Mario VidovićCo-founder & CTO

  • Ex-Kodelab: Founder & CEO.
  • The Win: Bootstrapped agency to €2.5M+ revenue.
  • Superpower: Shipping complex products.
Lucas Neves

The Designer

Lucas NevesCo-founder & CPO

  • Ex-Synthex: Head of Product Design.
  • The Win: Designed products used by 60M+ users.
  • Superpower: Humanizing complex AI interfaces.

Built with coaches. Want in?

Apply as a coach — it’s free, with no obligation to join.