Product work and selected context.

WODIQ

Workout planner that turns a goal, available time and recent training context into one structured session for today.

• Sport
• Training
• Product

Sudoku: Tessera

A calm sudoku for every day. Play the Daily or choose from six Classic levels on your phone, tablet or in your browser.

Built with Flutter for iPhone, iPad, Android and web. Classic works offline in the mobile apps; the web version needs an internet connection. Sync through Apple or Google is optional.

• Flutter
• iOS / iPadOS
• Android
• PWA

Personal project shelf

Projects, brain dumps and side paths live on marcel.tuinstra.dev. Tuinstra.DEV keeps the business layer sharper.

• Portfolio
• Context

Workflow discovery for sport and coaching

Intakes, training context and coach work often run through separate tools. A discovery shows which part deserves software.

• Discovery
• Sport
• Coaching

Admin workflow between parties

Mail, spreadsheets and loose agreements work for a while. Then the team loses track of the correct version. Tuinstra.DEV can sketch a first platform for that.

• Workflow
• Portal
• Custom