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Owler is a crowdsourced data model allowing users to follow, track, and research companies.

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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.

Which is more popular?
Based on our record, Owler seems to be more popular. It has been mentioned 1 time since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | corp.owler.com | isvalid.dev |
| Pricing | — | |
| Platforms | — | |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Owler yet.
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),...
What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Owler is particularly recommended for business analysts, sales and marketing professionals, and entrepreneurs who need reliable and up-to-date information on competitors and market trends. It's also beneficial for investors and job seekers looking to research companies.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Owler Introduction
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Owler and IsValid.dev.
IsValid.dev's answer:
IsValid offers 70+ validators in a single API — 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.
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.
IsValid.dev's answer:
Developers and software teams building applications that handle user input, financial data, or international identifiers — particularly in fintech, e-commerce, and SaaS products.
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.
IsValid.dev's answer:
Next.js, Fastify, PostgreSQL, Docker
Share your experience with using Owler and IsValid.dev. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


Owler is a good example of the type of app I need: https://corp.owler.com/. Source: almost 5 years ago
Tracking IsValid.dev since Apr 2026.
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