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Alternatives

Products that do what OnSubmit – the last input validation library of 2023 does

Because input validation shouldn't require convoluted set-up and mountains of nesting.And it should work both on the client and server.

  1. 1

    A practical guide on validating business ideas using Reddit

    2020

  2. 2

    A guide on validating business ideas using communities

    2020

  3. 3VJ
  4. 4FV
  5. 5

    A client-side form validation library

    2022

  6. 6
    Formst84

    Model-driven form library for React

    2021

  7. 7AS

    Hi HN! I made a really quick web app to help people validate their ideas. The app is a simple landing page builder, but every page includes a really simple Yes/No "Are You Interested?" poll. Every vote is recorded and tracked, and if they click yes they are brought to a page where they can submit an email. This makes validating ideas super easy because you can post your link to different communities and get statistically significant results as well as build an email list. Given an hour, you could easily create 50 different landing pages and be able to validate your ideas in bulk. The…

    2020

  8. 8

    Idea and MVP validation software

    2020

  9. 9

    Otherworldly personalized tips on idea validation, biweekly

    2022

  10. 10

    Validate your SaaS idea in seconds and unlock its potential

    2023

  11. 11AS
  12. 12
    is.js132

    Micro check library for programmers

    2015

  13. 13UI

    http://www.upboat.us Demo: http://www.upboat.us/idea/upboat Screenshot of logged-in view: http://i.imgur.com/vUZXfZc.png Upboat is an idea validation platform, somewhere inbetween Kickstarter and LaunchRock. If the idea you pitch receives over 200* "upboat"s (consented would-be users) within one week, you get the whole emailing list of all those who upboat'd it. If not, you get nothing. This is helpful for those who have ideas for side-projects, but lack the strong-enough incentive to get to work and just hack something together. Should you put up…

    2013

  14. 14FJ
  15. 15

    Validate your business idea with real-world data in 2 min

    2024

  16. 16

    Validate your Idea first then start building

    Nov 2025

  17. 17VJ
  18. 18V1

    A simple, fast, extensible python library for data validation. New features: * union validator * dynamic dict validator * timedelta validator * enum validator * slug validator * fqdn validator * nested model class GitHub: https://github.com/guyskk/validr Document: https://github.com/guyskk/validr/wiki Usage: https://github.com/guyskk/validr/wiki/Scenario-&-Example

    2020

  19. 19WA

    Will This Fly? is an online platform to gain feedback and validation on projects, ideas and minimum viable products. Building on the success of MVP1 (over 200 votes and plenty of feedback) we have improved the voting system, added the ability to attach a comment to your vote and improved the design. Check it out; anyone can vote and comment on MVP2. http://willthisfly.net/ (Note: We will be taking a limited number of project submissions shortly. If you have a project of your own, a minimum viable product or even an idea you are considering, you can leave your email address and we will let…

    2013

  20. 20

    Validate startup ideas in seconds before wasting months

    Jun 2026 · ismyideavalid.com

  21. 21SW

    2012 · markupvalidator.com

  22. 22SE

    Hello! I just wanted to share my very first project I decided to open source. It's (yet another) form validation library for React. https://github.com/adbutterfield/ez-react-form-validator I built it because I've never really liked Formik or React Final Form. Both seemed a bit overkill for most of my projects. I tried React Hook Form on a project recently, but it wasn't really my cup of tea either. Not sure if other people will find this form validator useful. But I'm putting it out there just in case. I also did want to give a quick shout out to the contributors of the…

    2020

  23. 23AN
  24. 24VA

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