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Defform is an AI-powered nuisance email detection service from TodoONada株式会社, primarily designed for website inquiry forms. It uses AI to analyze email content, sender information, and text patterns, classifying form submissions into sales emails, spam, and genuine customer inquiries. The goal is to reduce the need for manual review and prevent important customer messages from being buried under sales pitches.
The product focuses on form spam prevention and inquiry routing. Its AI can automatically classify営業メール, spam, and genuine inquiries; users can also configure industry-specific rules and their own NG words to continuously improve detection. Genuine inquiries can be delivered via the dashboard, email, and notifications, while potential false positives can also be checked in the dashboard. Integration supports existing website forms and CMS platforms such as WordPress, either by adding HTML code or through API setup; the official site says setup takes about 5 minutes. PRO also includes template forms, custom forms, auto-replies, custom auto-replies, A/B testing, and ad removal.
Pricing is transparent. FREE is permanently free and includes 1 user, 3 forms, 30 AI judgments per month, and 3 months of data retention. PRO costs ¥1,200/month or ¥12,000/year and includes 300 judgments per month. BUSINESS costs ¥5,000/month or ¥50,000/year and includes 3 users and 1,000 judgments per month. Extra AI judgments cost ¥5 each, additional forms cost ¥500, and annual billing effectively gives 2 months free. Payments are handled via Stripe.
The strengths are its clear focus, strong fit for the common problem of form-based sales emails faced by Japanese businesses, a long-term free option for low-traffic sites, and lightweight integration. The drawbacks are that public materials do not provide accuracy figures, model details, or independent evaluations; BUSINESS only specifies 3 users, with limited explanation of more granular permissions; and security/compliance information appears limited to terms covering personal data handling, outsourced processing, and applicability of Japanese law, with no disclosed certifications such as SOC 2 or ISO 27001. The terms also explicitly state that AI judgment is not guaranteed to be 100% accurate.
Defform is best suited to Japanese-market corporate websites, B2B companies, and small teams looking to reduce the cost of handling form spam and sales emails. Access from China cannot be determined from the available text; since payment relies on Stripe, mainland Chinese companies should verify network connectivity, foreign-currency/overseas card payment support, and compliance requirements for cross-border transfer of personal information before purchasing. Alternatives include reCAPTCHA, Cloudflare Turnstile, Akismet, CleanTalk, or the anti-spam features built into domestic customer service/form systems.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on defform.com official site.
defform.com is an Japan Forms & Survey provider. TG4G tracks its product information, an overall rating of 7.0/10, and a China-accessibility score of Workable. Click "Visit Official Site" to reach defform.com directly.