| Price from | Free | $19/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Plans published | 3 | 5 |
| Spec score · Email Verification APIs | 7.9 (#10) | 7.6 (#25) |
| Integrations | The maker describes integration through a REST API but does not name third-party app integrations on the opened pages. | The homepage provides example integration snippets for cURL, Node.js, Python, and Go. |
| Product | InboxTrue is an email validation API for checking whether addresses are real before sending email. | Usecheck is a real-time email validation API for detecting disposable, temporary, and fake email addresses. |
| Support | Enterprise customers can request dedicated support, and the API documentation says customers can contact InboxTrue about higher rate limits. | The pricing page lists email support for Starter, priority email for Pro and Business, and dedicated support for Enterprise. |