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Numverify VS IsValid.dev

Compare Numverify VS IsValid.dev and see what are their differences

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Contents:
  1. ยป Base Details
  2. ยป Videos
  3. ยป Reviews
  4. ยป Alternatives

Numverify logo Numverify

Global phone number validation and lookup API

IsValid.dev logo IsValid.dev

A powerful REST API for validating emails, IBANs, BIC/SWIFT codes, LEI, ISIN, credit cards, VAT numbers, phone numbers, and 70+ more validators. Free tier available.
  • Numverify Landing page
    Landing page //
    2023-05-09

NumVerify offers an extensive yet straightforward RESTful JSON API for a total of 232 countries around the world for domestic and international mobile number validation and information search. It is one of the reasonably priced API numbers. Additionally, it offers sophisticated capabilities like location lookup, carrier & line type detection, and intelligent phone number validation utilizing the most recent international numbering plans. For the best phone verification API, go to www.numverify.com.

  • IsValid.dev Main Page
    Main Page //
    2026-04-09

IsValid is a validation API service for developers who need to quickly verify data formats without building their own validators. It offers 40+ endpoints covering financial identifiers (IBAN, BIC, ISIN, CUSIP), international standards (ISBN, ISSN), technology formats (UUID, JWT, QR codes), regional codes (PESEL, REGON, VAT), and more.

The service works on a freemium model โ€” 100 free API calls per day, no credit card required. Users manage API keys through a dashboard with usage analytics showing daily call volume and per-endpoint breakdowns.

Numverify features and specs

  • Accurate Validation
    Numverify provides accurate validation of phone numbers, detecting formats, types, and carrier information, which helps ensure the phone numbers are real and formatted correctly.
  • Worldwide Coverage
    The service supports phone number validation in over 230 countries, making it highly versatile for global applications.
  • Easy Integration
    With a straightforward API, Numverify is easy to integrate into various systems and platforms, allowing for efficient phone number validation.
  • Real-Time Verification
    Numverify offers real-time phone number verification, which ensures that all data retrieved is up-to-date and relevant.
  • Fraud Prevention
    By validating phone numbers, Numverify assists in reducing fraud by ensuring that the numbers are legitimate, potentially saving businesses from scams.

Possible disadvantages of Numverify

  • Cost
    Although there is a free tier, accessing advanced features and higher usage requires a paid subscription, which may not be affordable for smaller businesses.
  • Rate Limiting
    The API may have rate limiting restrictions, especially on the free tier, which could affect applications requiring high-frequency validations.
  • Limited Free Tier
    The free tier offers limited features and a small number of monthly requests, which might not be sufficient for all users' needs.
  • Dependency on Service
    Relying on an external service like Numverify can introduce a dependency that might become an issue in case of downtime or service changes.
  • Privacy Concerns
    Users might have privacy concerns about sharing phone numbers with an external service for validation, requiring careful consideration of data handling and storage practices.

IsValid.dev features and specs

  • Lightweight schema validation
    IsValid.dev offers a minimal, lightweight approach to schema validation for TypeScript, avoiding the bloat that can come with larger validation libraries.
  • TypeScript-first design
    Built with TypeScript in mind, providing strong type inference so validated data automatically gets proper TypeScript types without extra manual typing.
  • Simple API
    The library offers an intuitive and easy-to-learn API for defining and running validations, making it accessible for developers to quickly get started.
  • Zero or minimal dependencies
    Being a lightweight tool, it typically has little to no external dependencies, reducing bundle size and potential security/maintenance issues from third-party packages.
  • Good for small to medium projects
    Its simplicity makes it well suited for smaller projects or use cases where heavier libraries like Zod or Yup might be overkill.

Possible disadvantages of IsValid.dev

  • Smaller community and ecosystem
    Compared to established validation libraries like Zod, Joi, or Yup, IsValid.dev has a much smaller user base, meaning fewer community resources, tutorials, and third-party integrations.
  • Limited documentation
    As a newer or less mainstream tool, its documentation may be less comprehensive than more established alternatives, making it harder to find answers to edge-case questions.
  • Fewer advanced features
    It may lack some of the advanced features found in more mature libraries, such as extensive built-in validators, custom error message localization, or complex schema composition tools.
  • Less battle-tested
    Being less widely adopted, it may not have been tested against as many real-world edge cases as more popular libraries, potentially leading to undiscovered bugs.
  • Uncertain long-term support
    Newer or niche libraries carry a higher risk of reduced maintenance or discontinuation over time compared to well-funded or widely-adopted projects.

Analysis of IsValid.dev

Overall verdict

  • IsValid.dev appears to be a developer-focused validation/utility tool that can be useful for quick, lightweight validation tasks, though I don't have verified, up-to-date details on its full feature set or reliability track record.

Why this product is good

  • Likely offers a simple, developer-friendly interface for validation tasks
  • Probably free or low-cost, making it accessible for quick checks
  • May support common validation formats (e.g., JSON, schemas, or data formats) useful in development workflows
  • Could save time compared to writing custom validation scripts for simple use cases

Recommended for

  • Developers needing quick, ad-hoc validation checks
  • Small projects or prototypes where a lightweight tool suffices
  • Users looking for a free or low-cost alternative to more complex validation suites
  • Learning or testing purposes rather than mission-critical production validation

Numverify videos

+ Add

How to Lookup Phone Number | Free Phone Number Verification API | numverify

IsValid.dev videos

No IsValid.dev videos yet. You could help us improve this page by suggesting one.

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Category Popularity

0-100% (relative to Numverify and IsValid.dev)

Numverify

IsValid.dev

Phone Number Validation
100 100%
Phone Number Validation
0% 0
Developer Tools
0 0%
Developer Tools
100% 100
Phone Number Verification
100 100%
Phone Number Verification
0% 0
API
76 76%
API
24% 24

Questions & Answers

As answered by people managing Numverify and IsValid.dev.

What makes your product unique?

IsValid.dev's answer:

IsValid offers 70+ validators in a single API โ€” covering financial identifiers (IBAN, BIC, ISIN, LEI), international standards (ISBN, ISSN), technology formats (UUID, JWT, QR codes), tax numbers (VAT, REGON, PESEL), credit cards, phone numbers, and more. No need to integrate multiple services for different data types.

Why should a person choose your product over its competitors?

IsValid.dev's answer:

Most validation APIs focus on one category (email or phone). IsValid covers financial, regional, and technical formats all in one place with a consistent REST API. The free tier with 100 calls/day requires no credit card, and integration takes minutes.

How would you describe the primary audience of your product?

IsValid.dev's answer:

Developers and software teams building applications that handle user input, financial data, or international identifiers โ€” particularly in fintech, e-commerce, and SaaS products.

What's the story behind your product?

IsValid.dev's answer:

IsValid was built out of frustration with piecing together multiple validation libraries and services. The goal was a single, reliable API that handles the full range of data validation needs developers encounter in real-world applications.

Which are the primary technologies used for building your product?

IsValid.dev's answer:

Next.js, Fastify, PostgreSQL, Docker

User comments

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Social recommendations and mentions

Based on our record, Numverify seems to be more popular. It has been mentiond 11 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Numverify mentions (11)

  • Top 5 Phone Number Validation ๐Ÿ“ž APIs for Developers: Features, Integration, and Pricing Guide โšก
    Overview: Numverify provides global phone number validation with extensive coverage of countries and carrier detection. Its real-time validation ensures businesses only process legitimate numbers. - Source: dev.to / over 1 year ago
  • Optimizing Call Routing Efficiency with Phone Number Carrier Lookup APIs
    Phone number carrier lookup APIs are indispensable tools for SaaS platforms, telecom providers, and application developers aiming to optimize call routing and security. By integrating these APIs, businesses can improve customer communication, prevent fraud, and reduce costs effectively. To explore reliable lookup solutions, visit Numverify today. - Source: dev.to / over 1 year ago
  • free-for.dev
    Numverify โ€” Global phone number validation and lookup JSON API. 250 API requests/month. - Source: dev.to / almost 4 years ago
  • A phone number verification API: what is it?
    As the name implies, phone confirmation APIs are used to verify contact information. Phone numbers are checked for validity and continued use by verification APIs and services (i.e., they exist). They can also be used to identify geographic data and standardize phone numbers for regulatory purposes. The phrase phone verification API is extremely broad. - Source: dev.to / almost 4 years ago
  • Reverse Phone API: The Future of preventing fraudulent phone calls
    This technology can be used in combination with other security measures to further protect your privacy and prevent fraudsters from getting through to you. When it comes to privacy and security, there are a few things more important than keeping your phone number safe. That's why reverse phone API can be such a valuable tool. By using this technology, you can keep your number hidden from public view, making it... - Source: dev.to / about 4 years ago
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IsValid.dev mentions (0)

We have not tracked any mentions of IsValid.dev yet. Tracking of IsValid.dev recommendations started around Apr 2026.

What are some alternatives?

When comparing Numverify and IsValid.dev, you can also consider the following products

Veriphone - Phone number validation & carrier lookup

Abstract APIs - Simple, powerful APIs for everyday dev tasks

Antideo - Email, IP address and phone number validation API service

mailboxlayer API - Mailboxlayer is a free, simple and powerful JSON API offering instant email address validation & verification via syntax checks, typo and spelling checks, SMTP checks, free and disposable provider filtering, and much more.

Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.

IBAN.com - IBAN checker is a software designed to validate an International Bank Account Number and identify the bank owning this account, BIC code and address.

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