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About One Brain All in One

Invoice Maker & Expense Tracker for Freelancers and Small Businesses

Create professional invoices, track your income and expenses, and manage your business finances in one simple app.

Designed for freelancers, contractors, and small business owners who want a fast and easy way to stay organized and get paid on time.

💼 Invoice Maker
Create invoices in seconds
Track paid, pending, and overdue invoices
Manage client payments easily

💰 Expense & Income Tracker
Track daily expenses and income
View your financial summary and balance
Organize transactions with categories

📊 GST & Financial Reports
View GST summaries and reports
Track income and expenses for tax purposes
Stay prepared for tax reporting

⏰ Reminders & Organization
Set reminders for payments and important tasks
Never miss due dates or deadlines

🧾 Warranty Tracker
Save product warranties
Track expiry dates
Get reminders before warranties expire

🔒 Simple & Secure
Clean and easy-to-use interface
Your data is secure and organized

What’s new

Version 1.0.1 · Updated March 18, 2026

• Fixed premium subscription detection issues • Improved subscription restore behaviour • UI improvements and bug fixes • Improved overall app stability

User reviews

Ib
Ib
I honestly love this app. It’s made managing both my personal and business finances so much easier. The layout is simple and intuitive, so tracking income and expenses only takes a few seconds. The reminder feature is a lifesaver because it helps me stay on top of important appointments. Being able to generate profe...
Adam Adam
Adam Adam
This app is an absolute game-changer for managing both personal and business finances! The intuitive interface makes it effortless to track income and expenses, while the reminder feature ensures I never miss an important appointment. I especially appreciate the ability to generate professional invoices directly wit...

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