
Numverify
Antideo
Numlookupapi.com
RealPhoneValidation
Melissa Data Quality
RealValidito
Abstract APIs
Phone number validation REST API. Simple, Free, and Open Source.

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Website, pricing, platforms and company facts side by side.
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| Website | numvalidate.com | opalstack.com |
| Pricing | — | |
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When comparing NumValidate and Opalstack, you can also consider the following products.

Global phone number validation and lookup API
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Email, IP address and phone number validation API service
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Our phone number lookup & validation API is the perfect tool to automate fraud protection & clean your database.
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Realtime API and Batch Phone Validation
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Melissa helps companies to harness Big Data, legacy data, and people data (names, addresses, phone numbers, and emails).
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Phone Validator | Real-time phone validation & carrier lookup API for US & Canada
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