
DuskTools.app
DevToys
JSONLint
CyberChef
regular expressions 101
DevsBox
FreeFormatter
19 free browser-based developer tools — no signup, no tracking, everything runs client-side.

Auth0
Okta
OneLogin
Atlassian Crowd
Amazon Cognito
Google Cloud IAM
Ping Identity
Flexible authentication solution for Rails with Warden.
Which is more popular?
Based on our record, Devise seems to be more popular. It has been mentioned 47 times since March 2021.
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | devtoolkit.site | github.com |
| Pricing | — | |
| Company | 1 - 9 employees · 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


DevToolKit is a collection of 19 free online developer tools that run entirely in the browser. No backend, no signup, no data ever leaves your machine. Built with Next.js 14 and Tailwind CSS. Tools include: JSON Formatter & Validator, JSON Tree Viewer with node path copying, YAML-JSON...
No description of Devise yet.
What each product offers, as listed by its team.


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
Devise is recommended for Ruby on Rails developers looking for a well-established and comprehensive authentication library. It's suitable for projects of various sizes, from startups to enterprise-level applications, particularly when rapid development with standard authentication features is desired.
Walkthroughs and reviews on video.
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Devise Fingerboard Review
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing DevToolKit.site and Devise.
DevToolKit.site's answer
DevToolKit runs 100% in the browser with zero signup. Unlike CyberChef, which has a steep learning curve with its recipe-based interface, DevToolKit gives you 19 standalone tools — each with a clean, focused UI for a single task. Unlike DevToys, it works on any device with a browser — no desktop app installation needed. And unlike SmallDevTools or similar online toolkits, DevToolKit includes unique tools like a PostgreSQL Config Generator (a free PGTune alternative), a Cron Expression Parser that calculates next 10 actual run times, and a JSON Tree Viewer with click-to-copy node paths. Every tool uses native browser APIs like Web Crypto for hashing — no data is ever sent to a server, which matters if you're working with production JWTs, API keys, or database configs.
DevToolKit.site's answer
Backend and full-stack developers who deal with JSON, JWTs, SQL, cron jobs, and PostgreSQL configuration on a daily basis. DevOps engineers who need quick encoding, hashing, or regex testing without installing CLI tools. Developers who care about data privacy and don't want to paste production tokens or API responses into random websites that may log input data.
DevToolKit.site's answer
I'm a backend developer with 10+ years of experience in Python and Go, working on distributed systems and microservices. Every day I was jumping between 5-6 different sites to format JSON, decode a JWT, test a regex, or convert a timestamp — each one bloated with ads, cookie banners, and signup walls. One evening I decided to build all the tools I actually use into a single place where everything runs client-side. The first version had 15 tools and took a weekend to build with Next.js and Tailwind CSS. After getting feedback, I added a PostgreSQL Config Generator (because PGTune hasn't been updated in years), a JSON Tree Viewer, and an HTTP Status Code Reference. It's now at 19 tools and growing based on what developers ask for.
DevToolKit.site's answer
Next.js 14 with App Router for server-side rendering and per-page SEO metadata. Tailwind CSS for styling with a custom dark theme. Web Crypto API (crypto.subtle) for SHA-1/256/384/512 hashing and cryptographically secure password generation — zero external crypto libraries. FileReader API for client-side Base64 file encoding. All tools are React components with no backend — the entire app is static and deployed on Vercel. Each tool is a separate route with its own metadata, canonical URL, and sitemap entry for independent Google indexing.
DevToolKit.site's answer
DevToolKit is a free tool with no accounts, so we don't track individual users. It's used by individual developers and small teams who need quick, private access to common dev utilities without enterprise overhead. The tool is designed for anyone who works with APIs, databases, or web development and wants a fast, ad-free, privacy-respecting alternative to existing online tools.
DevToolKit.site's answer
Three things set DevToolKit apart. First, it includes tools you won't find in other online toolkits — a PostgreSQL Config Generator that replaces PGTune with hardware-aware tuning calculations, a Cron Expression Parser that doesn't just describe the schedule but calculates the next 10 actual execution timestamps, and a JSON Tree Viewer where you click any node to copy its full JavaScript path like data.users[0].email. Second, every tool uses native browser APIs instead of external libraries — hashing runs through Web Crypto API with hardware acceleration, passwords use crypto.getRandomValues(), file encoding uses FileReader — meaning zero dependencies and zero data transmission. Third, each of the 19 tools lives on its own URL with dedicated SEO metadata, so you can bookmark devtoolkit.site/jwt-decoder/ and go straight to it — no navigating through menus or loading tools you don't need.
Share your experience with using DevToolKit.site and Devise. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


Tracking DevToolKit.site since Feb 2026.
ActiveRubyist is now a Progressive Web App (PWA) with Hotwire-based interactivity. For authentication, I use devise, and for real-time notifications, noticed. Where possible, I lean into default Rails features: for background jobs, I use... - Source: dev.to / over 1 year ago
Assume we use devise for authentication. We need to subscribe user for personal notifications channel. Add this line to app/views/layouts/application/_flash_container.html.erb. - Source: dev.to / over 2 years ago
If you like to know how to implement Devise for user authentication, here's the link- Devise. - Source: dev.to / about 2 years ago
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