isDisposable vs Verifalia
Both detect disposable email addresses — but they solve different problems. isDisposable is an open-source library and API for blocking fake signups in real time. Verifalia is a paid service focused on deliverability verification. Here's an honest breakdown.
What is Verifalia?
Verifalia is a paid email verification API and bulk service. It performs syntax, MX, and SMTP checks, classifies addresses, and detects disposable domains as part of a broader deliverability product.
Feature comparison
| Feature | isDisposable | Verifalia |
|---|---|---|
| Open source | ||
| Free tier | ||
| Offline / self-hosted check | ||
| No API key required (npm package) | ||
| Disposable / temporary email detection | ||
| Real-time MX / DNS checks | ||
| Full mailbox (SMTP) deliverability verification | ||
| Risk / confidence score | ||
| Bulk list cleaning |
full · partial · not available
Where isDisposable wins
- Open-source and offline — the disposable check never leaves your server.
- Free tier plus a bundled blocklist; no credit-per-check model.
- Sub-millisecond synchronous check, ideal for blocking fake signups.
- Auditable — you can read exactly which domains are blocked.
Where Verifalia wins
- Detailed per-address classification and verification statuses.
- Bulk verification jobs with a managed dashboard.
- SMTP-level checks confirming mailbox existence.
Which should you choose?
Choose Verifalia if you need full deliverability verification and detailed status codes for every address.
Choose isDisposable if your priority is stopping disposable-email signups cheaply, privately, and in one line of code. Many teams use both — isDisposable at the signup form, Verifalia for periodic list cleaning.
Try isDisposable in 60 seconds
npm install @isdisposable/jsimport { isDisposable } from '@isdisposable/js';
if (isDisposable(email)) {
throw new Error('Please use a permanent email address');
}Frequently asked questions
Is isDisposable a free alternative to Verifalia?
Yes. isDisposable is open source. The npm and PyPI packages bundle 160,073+ disposable domains and run offline for free. A paid API tier adds live DNS checks and scoring, with a free plan to start.
What does Verifalia do that isDisposable does not?
Detailed per-address classification and verification statuses.
Should I switch from Verifalia to isDisposable?
If your goal is blocking disposable and fake signups, your priority is stopping disposable-email signups cheaply, privately, and in one line of code. If you need full deliverability verification and detailed status codes for every address., Verifalia remains a strong fit — the two tools also work well together.
Start blocking disposable signups
Free, open-source, and live in one line of code.