Your Offline Engineering
Logbook

Engineers at construction site

Built by engineers, for engineers

Your Work. Your Data. Your Control.

Mobile app on construction site
Engineer holding phone with app

Stop relying on cloud tools that slow you down. With offline access, you stay productive even without the internet — no syncing issues, no privacy risks, and no dependency on others' servers.

Try it free today

Designed for Engineers, Built for Efficiency.

Stay organized, track progress, and focus on what really matters — building.

Project Tracking

Log your engineering projects, milestones, and technical decisions in one place

Financial Logs

Track invoices, expenses, and project budgets with complete privacy.

Report Generation

Create professional reports from your logs with simple formatting.

Your Data is Yours

No third-party access. Your logbook, your rules.

Lightning Fast

Native performance. No loading spinners. Works instantly, even offline.

Engineer-Friendly

Markdown support, keyboard shortcuts, and a no-nonsense interface.

How It Works?

K-First project tracking feature showing logbook entries

Track Projects

Document your engineering projects, decisions, and milestones as they happen

K-First financial management feature showing expense tracking

Manage Finances

Keep track of project expenses, invoices, and budgets privately and securely.

K-First report generation feature showing professional PDF reports

Generate Reports

Create professional reports from your logs whenever you need them.

why us?

We're engineers too. We built KFirst on principles we believe in.

No Tracking

Zero analytics. Zero telemetry. We don't know what you log.

Local-First

Your data lives on your device. Not our servers.

Your Control

Export anytime. Delete anytime. No lock-in.

Honest Limits

We're transparent about what KFirst can and can't do.

Ready for More?

KFirst is free forever. But if you want advanced features like cloud backup, team collaboration, and priority support, check out Pro.

  • Optional encrypted cloud backup
  • Advanced reporting and analytics
  • Priority email support