Holbrook Software
Holbrook Software is operated by Joseph Halls and publishes exam prep and practice tools for web and mobile.
These products are used by over 2,500 people worldwide, from the US and Canada to Hungary. They include RailFocus on web and mobile, ATC Aptitude Test Practice, the PLAB 1 + 2 Question Bank, and QuantPrep.
Educational software
RailFocusWeb platform for UK train driver assessment practice
Web
- RailFocus: Train Driver Test
Mobile app for train driver selection tests
iOS · Android
ATC Aptitude Test PracticeAptitude practice for air traffic control selection
iOS · Android
PLAB 1 + 2: Question BankQuestion bank for PLAB 1 and PLAB 2
Android
QuantPrep: Interview PrepQuantitative finance interview practice
Android
How I build them
On the web I use Next.js, React, and TypeScript, with Supabase for the database and Stripe for payments.
On mobile I use React Native and Expo, with the device's native payments.
For more detail on each product, see software development. If you have a question about Holbrook Software, use the contact page.