isitdisposable vs UserCheck
UserCheck is the closest product to ours: a paid real-time API with a rich response payload (relay detection, MX providers, typo suggestions, role accounts) and a free inline checker as the hook. It offers EU hosting and a DPA on its enterprise tier.
| Dimension | Is It Disposable | UserCheck |
|---|---|---|
| Primary purpose | Real-time disposable and deliverability detection at signup | Real-time email intelligence API |
| Detection method | DNS-level (MX, A, AAAA). No SMTP mailbox probing, ever | DNS-level, real-time (no SMTP probing) |
| Over-quota behavior | Fails open with a safe allow (HTTP 200), so your form never breaks | Per-plan credits; behavior on exhaustion varies |
| Enforcement model | Per-account policy maps every signal to allow, warn, or block | Returns signals; enforcement is left to you |
| Signals returned | Disposable, deliverability, relay, public provider, role, typo, spam risk | Disposable, relay, MX, public provider, role, typo, normalized email |
| Integration | Drop-in JavaScript snippet, REST API, and a batch endpoint | REST API with plugins and no-code integrations |
| Logging and privacy | Domain-only logging by default; stricter no-storage mode available | Varies; some offer EU hosting and a DPA |
When UserCheck might be the better fit
If hosting region and an enterprise DPA are your deciding factors today, UserCheck is a strong, established choice.
Where signup protection differs
Whatever you pick, three things matter at the signup form specifically, and they are the three we put in writing:
Fails open, guaranteed
Over quota or during an outage you get a safe allow, clearly marked unchecked. A signup is never lost to a detection dependency.
Your policy, not a score
Every signal maps to allow, warn, or block in your own policy. We return the action; your form enforces it.
Domain-only logging
Request logs never store the part before the @. The opt-in no-storage mode keeps only the verdict and billing metadata.
Try the real engine for free
The demo runs the live detection engine - no account needed. Sign up for a 14-day full-access trial to see the full product, then stay on the Free plan or upgrade.
Comparison based on public information and our June 2026 research; competitor features and pricing change, so verify current details on their site. See other comparisons.