isDisposable vs ZeroBounce
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. ZeroBounce is a paid service focused on deliverability verification. Here's an honest breakdown.
What is ZeroBounce?
ZeroBounce is a paid email validation and deliverability platform. It checks syntax, MX records, and mailbox existence, flags abuse and spam-trap addresses, and offers data-enrichment add-ons.
Feature comparison
| Feature | isDisposable | ZeroBounce |
|---|---|---|
| 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 generous bundled blocklist; no credit-per-check model.
- Built for the signup form: synchronous, dependency-free, sub-millisecond.
- Self-hostable and auditable — you can read exactly which domains are blocked.
Where ZeroBounce wins
- Spam-trap and abuse-address detection built for senders protecting domain reputation.
- Email data enrichment (name, location, activity signals).
- Established bulk verification dashboard and integrations.
Which should you choose?
Choose ZeroBounce if you run high-volume email campaigns and need spam-trap detection plus data enrichment.
Choose isDisposable if your priority is stopping disposable-email signups cheaply, privately, and with code you control. Many teams use both — isDisposable at the signup form, ZeroBounce 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 ZeroBounce?
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 ZeroBounce do that isDisposable does not?
Spam-trap and abuse-address detection built for senders protecting domain reputation.
Should I switch from ZeroBounce to isDisposable?
If your goal is blocking disposable and fake signups, your priority is stopping disposable-email signups cheaply, privately, and with code you control. If you run high-volume email campaigns and need spam-trap detection plus data enrichment., ZeroBounce 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.