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About this app
Quitting your job to start a one-person business?
If you are confident in your coding skills but feel lost regarding administration, start here.
▶ What is HelloWorld?
It is an all-in-one app that guides solo entrepreneurs through all the administration, taxes, and platform setup required to launch a business after leaving their jobs.
What industry code should I choose for business registration?
How much will health insurance premiums increase?
When is the deadline for VAT filing?
Do I need to register as an online retailer?
Don't bother searching through 10 blogs for these questions. HelloWorld is all you need.
▶ Key Features
• 20-Step Checklist
From business registration to your first sales. Check off each step in order. No need to worry about what you might have missed. Composed of 4 phases: Business Foundation Setup → Platform Setup → App Launch Preparation → Tax/Financial Management.
** • 34 Tools & Guides
7 simulators/assessments including Comprehensive Income Tax Simulator, 4 Major Social Insurance Calculator, VAT Calculator, Industry Code Recommendation, Mail-order Business Identifier, Youth Startup Tax Exemption Eligibility Check, Revenue Scenario Simulator, Invoice Generator, etc. + 27 Step-by-Step Guides.
• Tax Calendar + Push Notifications
VAT (Jan, April, July, October), Comprehensive Income Tax (May), Local Income Tax (June), Withholding Tax — Penalties apply if you miss the filing deadline. We notify you in advance via D-day countdowns and push notifications.
• Comprehensive Income Tax Simulator
Just enter your revenue and expenses to instantly check your estimated tax amount, applicable tax rate, tax base, and tax credits.
• 4 Major Social Insurance Calculator
Calculate estimated health insurance premiums when switching from an employee subscriber to a regional subscriber.
• Industry Code Recommendation
Software development, app services, freelancing, e-commerce — Guide to optimal industry codes by business type.
• Mail-order Business Identifier
What if there are in-app payments? If it's a subscription model? Step-by-step verification of whether filing is required.
▶ Recommended for:
• Office workers preparing to start a business before leaving their jobs
• Developers who have started generating revenue from side projects
• Those who have transitioned to freelancing but feel overwhelmed by tax filing
• Those who have started a one-person startup but are anxious about whether they have missed anything
▶ HelloWorld's Positioning
It does not replace a tax accountant. It is a tool that organizes "things you can prepare yourself before visiting a tax accountant."
Information is on the internet. But there was no journey.
HelloWorld weaves scattered information together in the correct order and guides you through the process to execution without missing anything.
Administration is fast, development is long.
Start with HelloWorld.
Contact: contact@daylab.dev
© 2026 DAYLAB
If you are confident in your coding skills but feel lost regarding administration, start here.
▶ What is HelloWorld?
It is an all-in-one app that guides solo entrepreneurs through all the administration, taxes, and platform setup required to launch a business after leaving their jobs.
What industry code should I choose for business registration?
How much will health insurance premiums increase?
When is the deadline for VAT filing?
Do I need to register as an online retailer?
Don't bother searching through 10 blogs for these questions. HelloWorld is all you need.
▶ Key Features
• 20-Step Checklist
From business registration to your first sales. Check off each step in order. No need to worry about what you might have missed. Composed of 4 phases: Business Foundation Setup → Platform Setup → App Launch Preparation → Tax/Financial Management.
** • 34 Tools & Guides
7 simulators/assessments including Comprehensive Income Tax Simulator, 4 Major Social Insurance Calculator, VAT Calculator, Industry Code Recommendation, Mail-order Business Identifier, Youth Startup Tax Exemption Eligibility Check, Revenue Scenario Simulator, Invoice Generator, etc. + 27 Step-by-Step Guides.
• Tax Calendar + Push Notifications
VAT (Jan, April, July, October), Comprehensive Income Tax (May), Local Income Tax (June), Withholding Tax — Penalties apply if you miss the filing deadline. We notify you in advance via D-day countdowns and push notifications.
• Comprehensive Income Tax Simulator
Just enter your revenue and expenses to instantly check your estimated tax amount, applicable tax rate, tax base, and tax credits.
• 4 Major Social Insurance Calculator
Calculate estimated health insurance premiums when switching from an employee subscriber to a regional subscriber.
• Industry Code Recommendation
Software development, app services, freelancing, e-commerce — Guide to optimal industry codes by business type.
• Mail-order Business Identifier
What if there are in-app payments? If it's a subscription model? Step-by-step verification of whether filing is required.
▶ Recommended for:
• Office workers preparing to start a business before leaving their jobs
• Developers who have started generating revenue from side projects
• Those who have transitioned to freelancing but feel overwhelmed by tax filing
• Those who have started a one-person startup but are anxious about whether they have missed anything
▶ HelloWorld's Positioning
It does not replace a tax accountant. It is a tool that organizes "things you can prepare yourself before visiting a tax accountant."
Information is on the internet. But there was no journey.
HelloWorld weaves scattered information together in the correct order and guides you through the process to execution without missing anything.
Administration is fast, development is long.
Start with HelloWorld.
Contact: contact@daylab.dev
© 2026 DAYLAB
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Location, App activity and 2 others
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
App support
About the developer
데이랩
support@daylab.dev
서초구 바우뫼로 91, 1층 10,11호-19(양재동,우성아파트)
서초구, 서울특별시 06751
South Korea
+82 10-6384-0037
