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Fast, free developer tools. JSON formatter, Base64, JWT, Regex and more. Runs 100% in your browser.
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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 | codetray.dev | readwise.io |
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Readwise: How to use Spaced Repetition with your books
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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 CodeTray.dev since Jun 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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