
Startup Checklist
StartupResources.io
StartupYar
Ultimate List of Startup Tools
Userfront
Free tools for startup founders. No signup. Runs 100% in your browser. Visualize your startup metrics

Auth0
Clerk
Keycloak
PropelAuth
Hanko
AuthKit
ZITADEL
Open-source Auth0/Clerk Alternative
Which is more popular?
Based on our record, Stack Auth seems to be more popular. It has been mentioned 4 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | lotoftools.org | stack-auth.com |
| Pricing | ||
| Platforms | — | |
| Company | Startup from Ukraine · 1 - 9 employees · 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


LotofTools is a growing collection of free online calculators and tools built for startup founders, marketers, and developers. Every tool runs entirely in your browser -no data leaves your device, no account needed, no ads. Unlike typical online calculators that give you one number after clicking...
No description of Stack Auth yet.
What each product offers, as listed by its team.


No features have been listed yet.
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
No analysis of Stack Auth yet.
Walkthroughs and reviews on video.
No LotofTools videos yet. You could help us improve this page by suggesting one.
W18D3 C3: Full Stack Auth Review: User/Computer Order & Developer Build Order
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing LotofTools and Stack Auth.
LotofTools's answer
LotofTools is a free collection of 1000+ instant online tools -all running 100% client-side in the browser with no signups, no data collection, and no backend processing.
Key differentiators:
LotofTools's answer
Most online tool sites feel like they were built in 2010 -ad-heavy, slow, ugly, and requiring you to click "Calculate" every time. LotofTools is a modern alternative built for how people actually work today:
LotofTools's answer
Startup founders, digital marketers, and developers who need quick, reliable online tools without the friction of signups, ads, or sending their data to a server. Secondary audiences include students, freelancers, and anyone who regularly Googles "X calculator" or "Y converter" and wants a faster, cleaner experience.
LotofTools's answer
It started when I Googled "percentage calculator" for the 500th time and landed on a site that looked like it was designed during the dial-up era -complete with 3 pop-up ads and a "Calculate" button that took 4 seconds to load a single number. I thought: "There's no way it should be this painful to divide two numbers." So I built one clean tool. Then another. Then I couldn't stop. Now im planning to cover 1000+ tools and counting - basically my revenge against every ugly, ad-infested calculator site that ever wasted my time.
LotofTools's answer
Next.js, React, TypeScript, Tailwind CSS, and Chart.js. All tools run 100% client-side in the browser - no backend, no database, no server-side processing.
LotofTools's answer
LotofTools is a free, open-access product - we don't have traditional "customers" with contracts. Our users are thousands of individual founders, marketers, developers, and students who discover our tools organically through Google search every day. We're built for the long tail - the person who Googles "burn rate calculator" at 2 AM before their board meeting.
Share your experience with using LotofTools and Stack Auth. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


Tracking LotofTools since Mar 2026.
Five minutes. That's how long Stack Auth takes to set up. - Source: dev.to / 10 months ago
Stack Auth (S24) | San Francisco, CA | Full-time Hiring founding & design engineers! We're building the customer platform for developers — think of a single service that does auth, payments, analytics, marketing emails, and so much more.... - Source: Hacker News / about 1 year ago
StackAuth is an open-source authentication and user management platform designed to integrate seamlessly into Next.js projects. Its combination of frontend/backend APIs and pre-built UI components dramatically simplifies the integration... - Source: dev.to / almost 2 years ago
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