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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.
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A jquery plugin for creating slideshows and carousels into your webpage.
Which is more popular?
Based on our record, Slick seems to be more popular. It has been mentioned 40 times since March 2021.
Website, pricing, platforms and company facts side by side.
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Slick
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| Website | isvalid.dev | kenwheeler.github.io |
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| Platforms | — | |
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In their own words, as submitted to SaaSHub.

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),...
No description of Slick yet.
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
Overall verdict
Why this product is good
Recommended for
Slick is recommended for web developers and designers who need a customizable, responsive, and efficient slider solution. It's particularly well-suited for projects that require touch-friendly interfaces or need to incorporate various multimedia content fluidly.
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How often each product is chosen within a category, 0–100% relative to the other.

As answered by people managing IsValid.dev and Slick.
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 IsValid.dev and Slick. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

Tracking IsValid.dev since Apr 2026.
In the past, I have copied code from Slick Sliders on to the container to generate the animation, but would love to learn how to hand code this myself. I work with WordPress in my company, so alot of PHP is involved as well. Source: about 3 years ago
I've tried a few things, like installing vue slick carousel but I'm getting a type error that I can't seem to fix. I looked around and could only find basic carousels, without that perspective and layer-stacking kind of stuff with the... Source: over 3 years ago
Depending how confident you are with JQuery, and what page builder you’re using, you may be able to set up a Slick Slider or similar around the Cover Block and use multiple Cover Blocks as the slides. Source: over 3 years ago
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