
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

JSONing API
Format JSON Online
JSON Placeholder
ReqRes
Beeceptor
Mockae
MockAPI
mock rest,rest mock,free json mock,api,mock api,free mock service,mock data

Which is more popular?
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | devfinancetools.com | mockrest.com |
| Pricing | — | |
| Platforms | — | |
| Company | 2026 | Startup from Poland · 1 - 9 employees · 2025 |
| Listed in |
In their own words, as submitted to SaaSHub.


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...
Mock REST endpoints in seconds. Test without backend delays. Built for developers who need reliable mock data now.
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.


No analysis of DevFinanceTools yet.
Overall verdict
Why this product is good
Recommended for
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using DevFinanceTools and MockRest. 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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Free and open-source mock API for testing and prototyping. Easily create a mock API from JSON data, with the ability to define custom rules for HTTP status codes, headers, and response bodies.
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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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Easily format, validate, and beautify JSON data with our free online tool. Includes powerful JSON conversion features for seamless data management
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Should you build an internal tool? Or just buy it?
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JSON Placeholder is a modern platform that provides you online REST API, which you can instantly use whenever you need any fake data.
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