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Fluid UI
Zeplin
The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project

Notion
Google Docs
Miro
Obsidian
Google Keep
GetGuru
OneNote
Spatial knowledge management for solopreneurs, freelancers, and neurodivergent thinkers who want total control of their projects, hate losing and searching for what they already have, and are tired of trying and quitting productivity apps.

Which is more popular?
Based on our record, Moqups seems to be more popular. It has been mentioned 5 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | moqups.com | opalrecall.com |
| Pricing | ||
| Company | Startup from Romania | Startup from the United States · 1 - 9 employees · 2025 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Moqups yet.
You remember where things are, not just what they're called. Manage your notes, documents, and important files on a visual, infinite canvas. Organize your draggable content spatially on a digital desk where everything remains visible, what's important stays top of mind, and whatever you need in...
What each product offers, as listed by its team.


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


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Introducing the new Moqups
More videos
Introducing Opal
More videos
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Moqups and Opal.
Opal's answer:
All your content is on a visual, infinite canvas desk. Notes, documents, files, etc. are draggable icons that you can organize spatially because we remember WHERE things are, not just what they're called. Opal keeps your work in sight so your brain never drops it.
Opal's answer:
When content is spatially organized, you stop losing content buried under folders, hierarchies, categories, and menus. Your brain begins to fire differently, sparking new ideas and spotting links, patterns, and opportunities it used to miss. - You connect ideas across clients, projects, and ideas - You Stay In Flow, No Context Lost, And No Rhythm Broken - You make faster, sharper decisions because every note and project is visible at once - You reuse your best work instead of rebuilding it from scratch - You eliminate the need for text-based searches and can find things even if you can't remember what you named them
Opal's answer:
Solopreneurs, freelancers, people juggling multiple clients, visual thinkers, neurodivergent thinkers, and people who've quit productivity apps.
Opal's answer:
Something was lost when everything went digital. Having used various tools for years, I eventually discovered a fatal flaw that nearly all knowledge management tools suffer from: their attepts to organize content became the means by which content got buried. Over time as more content gets added, it became harder to find things, especially when you can't remember what you called it.
We remember things in physical space because we see them all the time and register their existence subconsciously, even if we don't need them in the moment. For example, if you asked where my keys were, I could tell you instantly. This spatial reasoning and thinking effect is severely hindered in the digital space.
After enough frustration, I decided to do something about it: build a spatial knowledge management tool that lets you see everything all at once. As you pan and zoom around your workspace, you are registering the existence of things even when you don't need them in that moment. That changes everything over time. Organizing becomes less about categorization, labeling, or hierarchy, and more about placement and "where I left it". Your brain remembers where far more easily than what. This is why I built Opal.
Opal's answer:
Web-based application built on NodeJS, Express, Form.io (MongoDB), and JavaScript.
Share your experience with using Moqups and Opal. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


Moqups is another cloud-based best Figmaopen-source alternative used to create diagrams, prototypes, and wireframes. It offers a simple interface along with a variety of features designed specifically for teams,...
Moqups offers an impressive library of Icon Sets, widgets, and smart shapes to use on your website. Use diagram extenders and connectors to come up with diagrams and flowcharts. There are also hundreds of font options...
Moqups is another online application for building mockups, wireframes, and prototypes of UI designs. From diagrams to full-fledged and interactive prototypes, you can get it all done on this web-based app. The strong...
We have no reviews of Opal yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.


We need to determine the look and functionality of each view in the app. One of the best approaches is to draw each view of the app either using a mockup tool or on paper, this will give you a good idea of what information and data... - Source: dev.to / over 1 year ago
Moqups: Simple tool for creating wireframes and mockups. - Source: dev.to / over 1 year ago
Functions edit, add, remove post are for authorized persons (of course), that's why you have to make a new page with its layout by using Moqups, for example. - Source: dev.to / over 5 years ago
Tracking Opal since Apr 2026.
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