Tomotoku is a Japanese information and community website focused on referral codes, invitation offers, and ways to earn rewards through everyday services. It organizes referral links and user-submitted codes in searchable bulletin boards, helping visitors discover available sign-up bonuses and share their own invitations. The site covers a broad range of categories, including point-earning websites and apps, survey and walking apps, cashback and shopping services, cryptocurrency platforms, credit cards, bank and brokerage accounts, payment apps, prepaid services, and flea-market marketplaces.

Listings describe the service and summarize referral benefits, which may include points, cash, gift cards, miles, or digital assets; offers and eligibility can vary by provider. Tomotoku also publishes guides and updates about specific campaigns, explaining how visitors can use invitation codes to participate in promotions. The site is operated by Tomoko, who describes herself as a homemaker interested in earning rewards and connecting people through referrals.

Alongside its campaign information, Tomotoku invites community members to contribute codes and discuss opportunities, making it a practical directory for people exploring Japan’s referral and rewards services