Following the disclosure of the "php2shell" PHP vulnerabilities (CVE-2026-109618 and CVE-2026-109619) on October 21, 2026, we are writing to inform you that we will be operating our website with a reduced scope for the time being.

The version of PHP previously used on our servers is no longer officially supported and does not include patches for the "php2shell" vulnerabilities. Furthermore, due to compatibility issues with our web server environment, upgrading PHP is not feasible. Consequently, we have decided to migrate our operations to a new server environment that supports a secure, patched version of PHP.

However, due in part to the recent discovery of a Linux vulnerability (CVE-2026-99999), many web hosting providers have suspended new account registrations, making it impossible for us to secure a new server immediately. As a result, we are compelled to temporarily suspend various services that rely on PHP—such as license purchases, the downloading of license certificates, and changes to registered information—and will continue to operate with a minimal website configuration.

We sincerely apologize for the inconvenience this may cause and kindly ask for your understanding during this time.

Updated October 28, 2026
We apologize for the inconvenience caused by the service suspension.
It appears that many web hosting providers are currently overwhelmed with a surge in new subscription requests, which means that migrating our servers will likely take a significant amount of time. As an increasing number of our customers are being affected, we have decided to implement a temporary solution: we will apply vulnerability patches—backported by volunteers—to our current servers to keep the service operational for the time being.
Initially, we will resume the ability to download license certificates and reissue license information; subsequently, we plan to resume services for updating registration details and purchasing new licenses.

Updated October 30, 2026
The purchase procedure for Paint Tool SAI Ver.1 Software licenses have been resumed.

Beta version of PaintTool SAI will be distributed in the following page if it is available.

After the 31 days trial period expired and if you'd like to continue using PaintTool SAI, you need to purchase a "Software License".

"Software License" is shipped as digital certificate. When your order is completed, you will receive download password for your
software license certificate, and you can download your software license certificate from "Download Software License Certificate" page linked below.

if you downloading and installing your software license certificate to your SAI's program folder, you will remove trial limitation of SAI in current version 1.x.x, and you can use this version software without any trial limitation.

(This license include for all minor upgrade in current version 1.x.x, and not include major upgrade fee like ver.1.x.x to 2.x.x. Exceptionally, we will release SAI Ver.2 as free upgrade because we have canceled the improvement of SAI Ver.1.).

Purchase Summary
Product	PaintTool SAI Ver.1 / Software License
License period	No limitation in using this major version (for Ver.1.x.x)
Price	5500JPY (Include sales tax) per 1 software license. The product is priced at JPY (Japanese Yen). PayPal and AXES Payment will exchange your currency to JPY automatically. However, the exchange rate always changes. Please confirm the accurate price through the following service if you need. XE Currency Converter (by XE corporation)
Payment methods	Credit Card (VISA / MasterCard / JCB）(Serviced by AXES Payment Co.,LTD.)
	PayPal
Shipping method	Email (Include information for software license certificate downloading)
Delivery date	As soon as we confirm your ordering and payment.
Return Policy	Software License is not returnable, before purchasing please evaluate this software carefully.