
NotificationX
Nudgify
ProveSource
ProofGain
The Trustmaker
SocialProve
Sprofy
Optinjar helps online business increase their leads and sales by showing real-time social proof.Visitors will see notifications on the page when other people sign up or purchase.You can get subscribers and email addresses w Optinjar in a short time!

Omni Calculator
calculator.net
Build vs. Buy Calculator
DeveloperToolStack
DevNestTools
DevTools Advanced
DevTools.fit
Free, no-signup calculators for the money side of building software and freelancing

Which is more popular?
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | optinjar.com | devfinancetools.com |
| Pricing | ||
| Platforms | — | |
| Company | — | 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Optinjar yet.
DevFinanceTools is a collection of free, no-signup calculators for the money side of building software and freelancing. Everything runs in your browser — no account, no tracking beyond basic page-view analytics — and every tool shows its formulas and benchmarks so you can check the maths...
What each product offers, as listed by its team.


Possible disadvantages
Walkthroughs and reviews on video.
Optinjar Fomo and Popup System
More videos
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How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Optinjar and DevFinanceTools. For example, how are they different and which one is better?
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Helping you make rational decisions, one calculation at a time.
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Nudgify is a Social Proof App that includes FOMO, Urgency and Review Nudges. Adding Social Proof notifications to your site helps you build trust and increase conversions on Shopify, Wordpress or any other platform.
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Online calculator for quick calculations, along with a large collection of calculators on math, finance, fitness, and more, each with related in-depth information.
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ProveSource is a social proof marketing platform that streams recent customer behaviors on your website to build trust and increase conversions.
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Should you build an internal tool? Or just buy it?
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