FOUNDATION TESTER / ROUND 01

A tone-adjusting cosmetic. Use it, then decide.

After confirming shade failure, the next question is whether people will repeatedly use an experience that lets them adjust a ratio between two tone directions. We are recruiting candidates who recently missed a foundation shade and took corrective action.

01 / SURVEY

Share a recent failure and actual corrective behavior without a name or email.

02 / OPTIONAL APPLY

After the survey, choose whether to apply with scheduling and feedback commitments.

03 / INTERNAL SELECT

We review internal criteria and sample balance, then contact selected candidates only.

04 / USE

After safety and physical gates, selected candidates join supervised or seven-day use and a final interview.

Not a preorder · No payment · No purchase obligation · Not all applicants selected

Survey responses and tester applications are counted separately. Applying signals willingness to participate—not selection, use or purchase intent. Payment behavior is tested later, after price, refund and supply conditions are ready.

FOUNDATION TESTER / ROUND 01

Tester recruitment has not opened yet.

We will open recruitment once safety and privacy-operation checks are complete.
When it opens, the anonymous survey and optional application run on this page.

Applying is free and is neither a preorder nor proof of purchase intent. Selection, compensation and timing are not final. Skin-use begins only after safety and physical review and separate consent.

Tester Program — CASTLE FIVE