
JSONFormatter.org
Code Beautify JSON Validator
FreeFormatter
CyberChef
IT Tools
CodeBeautify
CodeSwissKnife
55 free formatters, converters, generators, and reference tools for developers — JSON, Base64, JWT, regex, hashes, subnets. Nothing you paste is ever uploaded.

Which is more popular?
Based on our record, Readwise seems to be more popular. It has been mentioned 88 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | whitekit.dev | readwise.io |
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In their own words, as submitted to SaaSHub.


WhiteKit brings together 55 developer tools in one place: formatters (JSON, XML, SQL, YAML), converters, security utilities (JWT, hashing, encoding), network calculators, and text tools. Everything runs 100% client-side. Your data never leaves your device, so you can safely paste API keys,...
No description of Readwise 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.


No analysis of WhiteKit.dev yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
No WhiteKit.dev videos yet. You could help us improve this page by suggesting one.
Readwise: How to use Spaced Repetition with your books
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How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using WhiteKit.dev and Readwise. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


We have no reviews of WhiteKit.dev yet. Be the first one to post
I imported my kindle highlights, as many others. Now I daily review some highlights (thanks to a dashboard, I am motivated). And where I didn't create highlights, as I only listened to the audiobooks, I get the...
Recommendations tracked on public social media and blogs since March 2021.


Tracking WhiteKit.dev since Aug 2026.
Anyway, as I reached the end of the chapter, I wanted to read my Readwise's daily recap. However, my iPhone was in other room. I didn’t want to get up; I was tired. - Source: dev.to / 4 months ago
The only highlights that Readwise retrieves semi-automatically are from the books I buy from Kindle, by going into the Readwise app and clicking a button. If I upload them to Kindle or need highlights from the Apple Books app, I have to... - Source: dev.to / almost 2 years ago
Readwise also has this feature. I get a daily email with a random assortment of highlights that have been pulled in from multiple sources (Reader, Notion, Kindle, etc.) The product benefit in their case is that it's kind of like Zapier,... - Source: Hacker News / almost 2 years ago
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Freeformatter is a platform that contains free online tools for developers, including formatters (json, html, xml, sql, etc.), minifiers (css, javascript), compactors, validators, and much more.
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Create a feedback-focused culture in Slack with Matter!
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