
JSON Generator
Dadroit JSON Viewer
Mockaroo
Insects API
Sheety
Sheetsu
Simple Scraper
Generate realistic random JSON data through a simple and intuitive GUI.

ProjectionLab
Boldin
CoastFIRE Hub
fjordFIRE
Empower.me
Financial Toolbelt
FIRE Tracker
Calculate your path to financial independence

Which is more popular?
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | mockturtle.net | firenum.com |
| Pricing | — | |
| Platforms | — | |
| Company | 2020 | Startup from the United States · 1 - 9 employees · 2019 |
| Listed in |
In their own words, as submitted to SaaSHub.


Build your custom JSON structure through our easy-to-use GUI or import an existing JSON schema. Then, sit back and let Mock Turtle generate thousands of random data based on your structure. It generates the data in real time as you build your tree structure. Plus, it's 100% free!
Free FIRE calculator suite for planning early retirement. Calculate your FIRE number, Coast FIRE, Lean/Fat/Barista FIRE, project retirement dates, and track net worth with the Progress Tracker. Project your journey twoards FIRe on a dashboard. Model market crash scenarios and other events....
What each product offers, as listed by its team.


An editorial look at what each product does well and who it suits.


No analysis of MockTurtle.net yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Free Nested JSON Mock Data Generator - MockTurtle.net
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing MockTurtle.net and Firenum.
Firenum's answer:
Firenum started as a single FIRE number calculator ("fire + num = your number") and grew into a full planner. The aim was to make FIRE planning free and private, and to say honestly when a fee-only advisor is worth paying for.
Firenum's answer:
Firenum plans your finances month by month and runs entirely in your browser, with no account and no signup. Your plan is stored on your own device, not on our servers. You get Monte Carlo simulation, historical backtesting against every period since 1871, and six stress scenarios (market crash, lower returns, job loss, expense spike, high inflation, retiring earlier or later), all for free. It supports 9 currencies with local number formatting, including lakh/crore for rupees and 万/億 for yen.
Firenum's answer:
Paid planners like ProjectionLab and Boldin keep features such as saving your plan or advanced drawdown modelling behind a subscription. Firenum includes all of it free, with no account. Choose it if you want serious FIRE planning without handing your financial details to a company, or if you plan in a currency other than USD. If you need detailed US tax modelling or Roth conversion planning, a paid tool may still suit you better.
Firenum's answer:
People working towards financial independence and early retirement (FIRE), from those who've just learned the 4% rule to those checking a drawdown plan before quitting. Many users are outside the US and want a planner that isn't built around US assumptions.
Firenum's answer:
Astro, Preact with Preact Signals, TypeScript, Chart.js, Web Workers (simulations run off the main thread), Cloudflare Workers for hosting, and Playwright for end-to-end tests. The backtesting uses Robert Shiller's historical S&P 500 data.
Firenum's answer:
Individual FIRE planners worldwide (no accounts, no data collected)
Share your experience with using MockTurtle.net and Firenum. For example, how are they different and which one is better?
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Create mock and sample JSON using a powerful template syntax
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The best retirement planning tool, FIRE calculator, and financial planning software built by, and for, the financial independence community.
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Open a 1GB JSON file in a blink 💣
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The #1 retirement planning tool online. Go beyond savings and investments with the best and most comprehensive financial planning software.
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Short Description | Free FIRE calculator toolkit — Coast, Barista, Fat, and Lean FIRE numbers in seconds.
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