Dadroit JSON Viewer
Jayson
ExtendsClass JSON Generator
MockTurtle.net
Fullstack Vue
Mockaroo
DevToys
Create mock and sample JSON using a powerful template syntax

Anki
Quizlet
MemoRep
study-lingo.com
FlipToMind
Memrise
AnkiApp
Train your memory with a science backed spaced repetition flashcard app built around active recall.

Which is more popular?
Based on our record, JSON Generator seems to be more popular. It has been mentioned 9 times since March 2021.
Website, pricing, platforms and company facts side by side.
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JSO
JSON Generator
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| Website | json-generator.com | spacerepeat.com |
| Pricing | — | |
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In their own words, as submitted to SaaSHub.

No description of JSON Generator yet.
Spacerepeat helps you remember what you learn. Create simple flashcards for any topic and review them over time using spaced repetition, a method that schedules reviews so information stays fresh in your memory. Study a little each day and build knowledge that lasts.
What each product offers, as listed by its team.

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

No analysis of JSON Generator 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.

As answered by people managing JSON Generator and Space Repeat.
Space Repeat's answer:
Space Repeat removes everything that distracts from actual learning: no feature overload. It focuses purely on active recall and spaced repetition, the two techniques with the strongest scientific backing for long-term memory.
Space Repeat's answer:
Most study apps optimize for engagement, not retention. Space Repeat is intentionally minimal. It shows you cards exactly when you're about to forget them, adapts to how hard each card is for you, and tracks your retention over time. The free plan is fully usable with no tricks.
Space Repeat's answer:
Students who want to remember what they study for the long-term, especially those preparing for exams or learning large amounts of material over time.
Space Repeat's answer:
I'm a student myself. I tried the flashcard apps that already exist, but none of them felt right. Some were too flashy, packed with features I didn't need. Others were too bare-bones, with free plans so limited they were barely usable. I wanted something in the middle: a focused app that does a few things really well, with no distractions and a free plan you can actually use.
Share your experience with using JSON Generator and Space Repeat. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

JSON Generator: also generates mock data, but for JSON specifically. It's a bit more complex, but it allows for tailor-made results. - Source: dev.to / almost 3 years ago
Is there a generator for all the JSON generators out there? https://json-generator.com/. - Source: Hacker News / about 3 years ago
So I generated a random JSON file and tried parsing it. It doesn’t error, but whenever I do a println(root.Object().Value().String()), I get a panic: wrong type. If I do a println(root.Object().Present()), it prints false. So seems like... Source: over 3 years ago
Tracking Space Repeat since Mar 2026.
When comparing JSON Generator and Space Repeat, you can also consider the following products.

Open a 1GB JSON file in a blink 💣
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Anki is a program which makes remembering things easy. Because it's a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.
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Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.
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ExtendsClass's JSON generator allows to generate random JSON data from a template.
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Spaced repetition that emails you when it’s time to review.
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