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120 free browser-based developer utilities. No sign-up required.
Which is more popular?
Based on our record, Lenns.io seems to be more popular. It has been mentioned 11 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | devtoolstack.io | lenns.io |
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What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing DeveloperToolStack and Lenns.io.
Lenns.io's answer:
Ruby on Rails, Postgres, Sidekiq.
Share your experience with using DeveloperToolStack and Lenns.io. 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 DeveloperToolStack yet. Be the first one to post
Lenns.io is more than a RSS reader. It's a website reader as it can follow posts by titles in cases when there isn't an exposed RSS feed. My favourite part is setting priorities per source and category as well as...
Recommendations tracked on public social media and blogs since March 2021.


Tracking DeveloperToolStack since Aug 2026.
"p.s. I will be building an RSS reader/platform in the coming weeks" - the RSS reader was actually built. And it's been actively used and public since then: https://lenns.io/. - Source: Hacker News / about 2 years ago
Https://lenns.io/ - it may not be exactly ready for prime time (lacking communication & marketing); however, it's been fully functional and my RSS reader of choice for the last 2 years. Why - a single source cannot overwhelm my feed; I... - Source: Hacker News / almost 3 years ago
For those interested in new(opinionated) RSS readers, I'd like to know what you guys think about https://lenns.io/? - Source: Hacker News / over 3 years ago
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Free, no-signup developer tools for technical SEO: robots.txt, sitemap.xml and .htaccess generators, plus practical guides. Everything runs in your browser.
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The content you need to accelerate your research, marketing, and sales.
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