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supastarter VS IsValid.dev

Compare supastarter 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

supastarter logo supastarter

The boilerplate for your next web app built on top of Supabase and Next.js.

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.
  • supastarter Landing page
    Landing page //
    2023-02-17
  • 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.

supastarter features and specs

  • Ease of Use
    Supastarter provides a streamlined setup process, making it easy for developers to quickly initialize and configure their projects without hassle.
  • Comprehensive Features
    Includes a wide variety of prebuilt features and integrations, allowing developers to implement extensive functionality without starting from scratch.
  • Customizability
    Offers a high level of customization, enabling developers to tailor their projects to meet specific requirements and preferences.
  • Community Support
    Backed by a strong community offering support, plugins, and extensions, providing valuable resources and collaborative opportunities.

Possible disadvantages of supastarter

  • Learning Curve
    While easy to use, new users may face an initial learning curve to fully understand and utilize all the features effectively.
  • Overhead
    The comprehensive nature of Supastarter might introduce additional overhead, which could be unnecessary for simpler projects.
  • Dependency Management
    Reliance on certain libraries or frameworks could lead to dependency management challenges, especially as projects grow in complexity.
  • Update Frequency
    Frequent updates could require developers to spend time on maintenance and compatibility checks, which can be time-consuming.

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

supastarter videos

+ Add

Supastarter - The Ultimate Tool For Indie Hackers

More videos:

  • Review - Building Email Marketing Startup - "SupaStarters" Podcast

IsValid.dev videos

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

Add video

Category Popularity

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

supastarter

IsValid.dev

Developer Tools
96 96%
Developer Tools
4% 4
API
0 0%
API
100% 100
Boilerplate
100 100%
Boilerplate
0% 0
API Tools
0 0%
API Tools
100% 100

Questions & Answers

As answered by people managing supastarter 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

Share your experience with using supastarter and IsValid.dev. For example, how are they different and which one is better?
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Social recommendations and mentions

Based on our record, supastarter seems to be more popular. It has been mentiond 14 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.

supastarter mentions (14)

  • The 10 Best Next.js Starter Kits for SaaS in 2026
    Price: $349 (Solo) / $799 (Startup, 5 seats) / $1,499 (Agency, 10 seats, white-label) - one-time URL: supastarter.dev. - Source: dev.to / 4 months ago
  • What's the Best Way to Vibe Code a SaaS in 2026?
    Options like ShipFast ($250) and Supastarter (starting at $299) are popular choices. They're packed with lots of features and have a strong history of adoption and support. - Source: dev.to / 5 months ago
  • supastarter and Indie Hacking with Jonathan Wilke
    Want to skip to the Discount code for supastarter: CODINGCATDEV. - Source: dev.to / over 1 year ago
  • Thoughts on Paid Next.js Template/Boilerplate
    To build complex applications, https://supastarter.dev/?aff=zXRYe is currently the best I've used, based on a monorepo, with complete features and clear, robust code. However, the downside is that there are very few components for landing pages, which complements shipfast perfectly, But his price is also the most expensive.. There are also two other good ones: - https://anotherwrapper.com/?aff=zXRYe Build AI... - Source: Hacker News / about 2 years ago
  • Thoughts on Paid Next.js Template/Boilerplate
    I bought https://shipfa.st/?via=top during Black Friday, but I'm not particularly satisfied with it because Marc focuses too much on marketing rather than continuously improving Shipfast, and there might not be new features for a month or two. This is more suitable for building landing pages rather than complex applications, as the rich components are basically designed for landing pages. In terms of landing pages... - Source: Hacker News / about 2 years ago
View more

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 supastarter and IsValid.dev, you can also consider the following products

ShipFa.st - The NextJS boilerplate with all the stuff you need to get your product in front of customers. From idea to production in 5 minutes.

Abstract APIs - Simple, powerful APIs for everyday dev tasks

Makerkit - Customer feedback, public roadmap & product changelog

Numverify - Global phone number validation and lookup API

UseGravity.App - Build a Node.js & React app at warp speed with a SaaS boilerplate

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.

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