Easy, professional, and ready to use.
Kantan Seikyu is an all-in-one invoicing app that anyone can use to create beautiful business documents with ease.
Whether you’re a freelancer, small business owner, or side-business operator, you can create professional invoices, quotations, receipts, purchase orders, and delivery notes within minutes — no registration required.
Key Features
Create and manage quotations, invoices, receipts, purchase orders, and delivery notes.
Multi-language and multi-currency support for international business.
Fully compliant with Japan’s Qualified Invoice System (Invoice制度) and Electronic Bookkeeping Law.
NEW: Invoice report – instantly view statistics and export data.
NEW: Custom email templates for smooth client communication.
NEW: Keyboard shortcuts for faster desktop operations.
Manage multiple bank accounts and optimize transfer fees (supports international transfers).
Sync data securely via Google Drive or work fully offline.
No account or sign-up required — start using it immediately.
Ideal For
Freelancers and self-employed professionals.
Small businesses, startups, and international traders.
Users who need invoice compliance (Invoice制度対応).
Those managing side businesses (副業).
Entrepreneurs who value simplicity, privacy, and speed.
Kantan Seikyu is an all-in-one invoicing app that anyone can use to create beautiful business documents with ease.
Whether you’re a freelancer, small business owner, or side-business operator, you can create professional invoices, quotations, receipts, purchase orders, and delivery notes within minutes — no registration required.
Key Features
Create and manage quotations, invoices, receipts, purchase orders, and delivery notes.
Multi-language and multi-currency support for international business.
Fully compliant with Japan’s Qualified Invoice System (Invoice制度) and Electronic Bookkeeping Law.
NEW: Invoice report – instantly view statistics and export data.
NEW: Custom email templates for smooth client communication.
NEW: Keyboard shortcuts for faster desktop operations.
Manage multiple bank accounts and optimize transfer fees (supports international transfers).
Sync data securely via Google Drive or work fully offline.
No account or sign-up required — start using it immediately.
Ideal For
Freelancers and self-employed professionals.
Small businesses, startups, and international traders.
Users who need invoice compliance (Invoice制度対応).
Those managing side businesses (副業).
Entrepreneurs who value simplicity, privacy, and speed.
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