The #1 platform for endurance coaches, endorsed by IRONMAN world champion Frederik Van Lierde. I built it from the first wireframe and now lead its technology full time.
- coaches
- 3K+
- workouts
- 12M+
- athletes
- 25K+
- countries
- 35+
Bert Devriese
I build and run my own software
I started as a developer. Twenty years of building my own products taught me the rest: deciding what to build, designing how it works, and architecting how it runs. Now that AI writes much of the code, that range is what counts.
Version history
Every product I built and ran, newest first.
Now
2026
Tools I built for how I work now: next to AI agents, on a Mac.
Runs your coding agents, dev servers and terminals side by side, grouped per project.
Previews Mermaid diagrams. Your AI agent pushes them to a real window for review.
Drops every new screenshot on a floating shelf, one drag away from your AI agent.
Opens Peppol invoices on your own computer, just like a PDF or Word file.
2023
In Aikido's early days I built their
aikido-cliand the Bitbucket integration.2021
Num•Num Sold
Sold the invoicing platform I founded and built five years earlier.
2018
A PHP library for UBL and Peppol invoices. 130+ stars, close to a million downloads, and I still help maintain it.
2016
Simple e-invoicing for freelancers and small businesses that replaced their spreadsheet admin.
Belgium and the Netherlands' #1 cheap-flight newsletter. Automated price scanning sends 90,000+ subscribers the best deals.
2013
Went indie
Quit my developer day job to become a full-time, self-employed indie developer.
2011
Web agency
Built web applications at a web agency.
2006
Prepress industry
My first developer job: web applications for the prepress industry.
1997
First version
Built my first personal websites at 12. As a teen I made sites for things like the In Flanders Fields Marathon, plus plenty of other tinkering projects.
Pre-alpha
Before the first version
For as long as I can remember, I've been at a computer: starting
DOOM.EXEandDUKE3D.EXEfrom Windows for Workgroups 3.11, customising my mouse pointer in Workbench 1.3 on the , or watching BeOS over my father's shoulder.
Currently building, not for hire
I'm full-time CTO at Coachbox, so I'm not taking on freelance projects. Got something that genuinely needs me? Leave a note and I'll reach out when I free up.