DISIFY Alternative for Fast Disposable Email Screening

Compare IronDome and DISIFY for signup screening: free quotas, paid pricing, latency methodology, and the response changes to handle when migrating.

If you use DISIFY to detect disposable signup emails, IronDome is a strong alternative: 500 free checks per month, then $1 per 1,000 checks without a subscription. It screens known temporary addresses and domains before account creation or trial-credit allocation, with hourly data updates and warm-connection median latency below 20 ms across four tested regions.

Choose for the workflow, not just the free allowance

DISIFY has a larger free allowance. Its documented free account limits are 30,000 validations per month, 10,000 per day, and 60 requests per minute. New accounts are limited to 1,000 validations per day and 10 requests per minute during their first 24 hours.

Paid plans start at US$9 per month for Starter and US$19 for Pro, plus applicable VAT. They remove the monthly quota while retaining limits of 120 and 500 requests per minute respectively.

IronDome's proposition is focused screening, hourly address and domain updates, SDK integration, and measured low-latency operation with reused connections. Evaluate those requirements alongside the bill. A product receiving a few hundred signups per month has a different decision from a bulk-import pipeline.

Prices and allowances were checked on October 28, 2026. For a broader shortlist, see the five-API comparison.

Put a focused decision before trial credits

IronDome checks known disposable addresses on shared providers such as Gmail and Outlook as well as disposable domains. That matters when the provider's name alone cannot distinguish a legitimate mailbox from a temporary address.

The result is straightforward: the input is classified as disposable or it is not detected as disposable. Use that decision before the protected action, then continue ownership verification and your trial-eligibility rules.

DISIFY also documents per-address and alias detection on shared providers. The useful comparison is how each service handles representative addresses and fits your application, rather than assuming one is limited to a domain list.

Build for low latency with connection reuse

IronDome's published measurements show warm-connection medians of 4.84–15.52 ms across US East, US West, Europe, and Singapore. The measurements include network and response handling.

Keep a server-side HTTP client or SDK instance available so connections can be reused. IronDome offers SDKs for JavaScript, Python, Go, and Rust. Test fresh connections and tail latency from your own backend as well as the typical successful request.

Our API comparison includes DISIFY test results and the input and connection conditions used. For a direct comparison, test both services on the same current addresses from your backend with the same connection settings.

Preserve address details during migration

DISIFY's single-email endpoint supports form-encoded POST requests. Its documentation specifically warns that literal plus characters must survive encoding. A malformed request that turns + into a space can change what you are testing.

IronDome accepts a JSON POST to https://api.irondome.dev/v1/check with one email string and a Bearer API key. Submit the original address rather than stripping tags yourself. Keep the API key on your server and use the request contract for the exact body and headers.

The response migration has four important differences:

• Both services expose disposable. Use that field for the disposable decision, not DNS status or a provider whitelist.
• DISIFY can return HTTP 200 with format: false. IronDome returns HTTP 422 for invalid email syntax, so update that branch explicitly.
• IronDome's valid field means syntax and normalization passed. It is not an equivalent for DISIFY's dns result.
• DISIFY's confidence, signals, and paid privacy-relay controls do not map directly to IronDome's classification reason. Retain those separate policies if your application relies on them.

Test malformed input, plus-tagged addresses, known disposable addresses, and legitimate controls before changing enforcement.

Keep an explicit unavailable outcome

A successful negative classification and a failed request are different outcomes. For an availability-first signup policy, allow registration during a screening failure and record that the check was skipped. That keeps registrations moving, but temporary addresses can get through unchecked.

Do not carry a provider's retry behavior into a replacement without reviewing it. IronDome advises against automatically retrying timed-out checks because they may already have completed and counted toward usage. See the trial-abuse prevention guide for separating registration from trial grants.

Keep DISIFY when its larger free allowance or extra signals are central to your workflow. Choose IronDome for a focused signup-screening integration with hourly updates, SDKs, usage-based billing, and documented low warm-connection latency.