Legal notice (Japan: Act on Specified Commercial Transactions)
Last updated: 2026-07-27
Operator
Takashi Homma (sole proprietor), trading as dhq-boiler.
Address and phone number
Disclosed without delay on request. Write to support.paperplane@dhq-boiler.dev and we will send them to you.
Contact
support.paperplane@dhq-boiler.dev. We answer in Japanese and English.
Seller of record
Paddle.com Market Ltd acts as the merchant of record. Payment, invoicing, tax and refunds are handled by Paddle under its own terms.
Price
USD 9.99 per month, or USD 99 per year. The checkout shows the final amount in your currency with tax included.
Costs beyond the price
None. Your own internet connection is at your expense.
Payment methods
Credit and debit cards and the other methods Paddle offers at checkout.
When payment is taken
Immediately when you subscribe, and then automatically at the start of each billing period until you cancel.
When you receive the product
The licence is emailed as soon as the payment completes, usually within a few minutes. The installer is downloaded from this site.
Cancellation and refunds
Cancel at any time from the receipt email; you keep access until the end of the period you paid for. Because this is downloadable software it cannot be returned, but we refund any charge in full if you ask within 30 days of it.
System requirements
Windows 10 or Windows 11, 64-bit. Everything needed is inside the installer; there is nothing else to install. About 300 MB of disk space.
Trial
14 days, with no card and no account. Nothing is charged unless you choose to subscribe.