Mem VS Opal

Compare Mem VS Opal and see what are their differences

Rating: 0 reviews
Pricing: Open source

Rating: 0 reviews
Pricing: Freemium Free trial $27 / Monthly (Core Essentials, 1,000 items, 5 GB storage, 25MB file uploads)

Notivo

Notivo is a private, per-person notebook for managers. Capture feedback, commitments, and 1:1 context as it happens — from web, iOS, WhatsApp, email, ChatGPT, or Claude — then get it back later, organized by person. sponsored

Which is more popular?

Based on our record, Mem seems to be more popular. It has been mentioned 6 times since March 2021.

social mentions: 6 vs 0
Productivity popularity: 96% vs 4%
alternatives listed: 240+ vs 14

Base details

Website, pricing, platforms and company facts side by side.

	Mem	Opal
Website	get.mem.ai	opalrecall.com
Pricing	Open source	Freemium Free trial $27 / Monthly (Core Essentials, 1,000 items, 5 GB storage, 25MB file uploads) Official pricing
Company	—	Startup from the United States · 1 - 9 employees · 2025
Listed in	Productivity Task Management Note Surveys Form Builder AI +3	Knowledge Management Note Taking Productivity Knowledge Base Document Management Document Management System Task Management Todos Project Management Notes +7

About Mem and Opal

In their own words, as submitted to SaaSHub.

Mem

Opal

No description of Mem 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...

Features and specs

What each product offers, as listed by its team.

Mem 5 features

Opal 14 features

Intuitive User Interface
Mem offers a user-friendly interface that is simple and easy to navigate, reducing the learning curve for new users.
AI-Powered Organization
Utilizes AI to automatically organize notes and knowledge, allowing users to focus more on content creation rather than management.
Cross-Platform Syncing
Supports cross-platform syncing, enabling users to access their notes on various devices seamlessly.
Collaboration Features
Provides tools for sharing and collaborating on notes, which can be particularly useful for team projects and shared tasks.
Integrations
Integrates with other productivity tools such as calendars and task managers, enhancing its functionality and usefulness in a workflow.

Possible disadvantages

Limited Free Version
The free version comes with limited features, potentially prompting users to pay for a subscription to access full functionality.
Learning Curve for Advanced Features
While the basic interface is intuitive, the more advanced features may require additional time and effort to master.
Data Privacy Concerns
As with any AI-powered application, there could be concerns about how data is managed and protected, especially for users sensitive about privacy.
Complexity in Automations
The automation features, while powerful, can be complex for users unfamiliar with setting up automated workflows.
Reliance on Internet Connectivity
Requires a stable internet connection for full functionality, which can be a limitation for users in areas with poor connectivity.

Spatial Knowledge Management
Store your notes & documents, drag them around, and zoom and pan an infinite canvas, like a big desk, so you can see everything in context
Block Editor for Docs & Notes
Author content in a WYSIWYG block editor with markdown under the hood and copy-paste & drag and drop support for images, media, and files.
Internal Item Links
Build your knowledge base, cross-reference standard operating procedures (SOPs), or just connect ideas with clickable internal links that open your other docs & notes
Binders
Stack similar and repeating content in binders or use them to archive old content to keep your workspaces clutter-free
Fences
Spatially organize projects and similar content in draggable, resizable fences that provide unique work zones for different projects
Open Multiple Items
It's much easier to make comparisons, cross-reference information, and get a clearer picture of your work when you can see it all at once and drag and drop content from one open item to another.
Sharing
Share content with anyone, configure 4 levels of permissions (view, edit, share, delete shares), and collaborate in real-time on notes and documents
Opal API with AI Agent Skill
Programmatically manage your Opal content through the API or give your AI agents view or full access to create and manage content for you
AI Transcription Integration with CRUSH
Connect your [CrushTheMemory.com](http://CrushTheMemory.com) device to store your recordings and transcriptions as Opal notes or documents and map your CRUSH folders to fences, binders, and/or workspaces
Drag and Drop Files
Store PDFs, images, video, documents, or any file as File item types on your workspaces or as rich media embedded in notes and documents
Export Content
Export your content as HTML, markdown, or PDF
Publish to the Web
Publish content as external web pages for anyone to view without an Opal account
Bookmarks & iFrames
Bookmark links (that you can take notes on) and embed iframe content (like Google Docs) to view and edit while in Opal
Zero Nonsense Task List
Set the date (or default to "today") and create 10 tasks on the same day in seconds with zero clicks, sorted stalest first, that connect to your notes & docs. One-click dismissal.

Analysis

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

Mem

Opal

No analysis of Mem yet.

Overall verdict

Opal (opalrecall.com) is a solid choice for individuals and teams looking for a privacy-focused, AI-powered tool to capture, organize, and recall information such as meeting notes, screen activity, or personal knowledge, though it may still be maturing compared to more established competitors.

Why this product is good

Combines AI search with personal knowledge management to help users quickly retrieve past information
Offers privacy-conscious design, appealing to users cautious about data security
Simplifies capturing screen activity, notes, or meeting content in an organized, searchable format
Actively developed with a focus on productivity and reducing time spent searching for information
Provides a clean, user-friendly interface suited for both individuals and small teams

Recommended for

Professionals who need to quickly recall meeting details or research
Teams looking for lightweight knowledge management tools
Individuals concerned about data privacy in AI-driven apps
Remote workers who rely on digital notes and screen captures for productivity
Users seeking an alternative to bulkier enterprise knowledge management systems

Videos

Walkthroughs and reviews on video.

Mem 3 videos + Add

Opal 4 videos + Add

Mem: A First Look

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100

Mem

Opal

96% 96%

Productivity

4% 4%

0% 0%

Project Management

100% 100%

0% 0%

100% 100%

Note Taking

0% 0%

Questions & Answers

As answered by people managing Mem and Opal.

What makes your product unique?

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.

Why should a person choose your product over its competitors?

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

How would you describe the primary audience of your product?

Opal's answer:

Solopreneurs, freelancers, people juggling multiple clients, visual thinkers, neurodivergent thinkers, and people who've quit productivity apps.

What's the story behind your product?

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.

Which are the primary technologies used for building your product?

Opal's answer:

Web-based application built on NodeJS, Express, Form.io (MongoDB), and JavaScript.

User comments

Share your experience with using Mem and Opal. For example, how are they different and which one is better?

Reviews and articles

External articles and on-site reviews we used to compare the two products.

Mem no reviews yet

Opal no reviews yet

Best Next-Level Note Apps for 2021
zenkit.com · Jun 2021

Mem is a note-taking app focusing on simplicity, quickness, and collaboration. The app allows users to capture, connect, and share information easily. It combines features such as lightning fast capture, always-on...

We have no reviews of Opal yet. Be the first one to post

Social recommendations and mentions

Recommendations tracked on public social media and blogs since March 2021.

Mem 6 mentions

Opal 0 mentions

Anyone with a great idea how to use LLMs like GPT-3 to embed our Obsidian notes across applications?
Eg https://get.mem.ai/ approach or https://beta.omnilabs.ai/ But then tailored to Obsidian. Source: almost 4 years ago
Second Brain App recommendation
I use Notion but I have heard that the andriod experience is not the best. You may want to try Coda, Obsidian, Mem or Anytype. I know of a few others but I think for the purpose of a second brain these can do the trick it’s just about... Source: about 4 years ago
E-Bullet Journal
Https://get.mem.ai right now it isa web app they have an iOS app in beta. Source: over 4 years ago

Tracking Opal since Apr 2026.

Alternatives to Mem and Opal

When comparing Mem and Opal, you can also consider the following products.

Notion
All-in-one workspace. One tool for your whole team. Write, plan, and get organized.

Compare Notion to Mem or Opal:

Notion vs Mem Notion vs Opal
Obsidian
A second brain, for you, forever. Obsidian is a powerful knowledge base that works on top of a local folder of plain text Markdown files.

Compare Obsidian to Mem or Opal:

Obsidian vs Mem Obsidian vs Opal
Google Docs
Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.

Compare Google Docs to Mem or Opal:

Google Docs vs Mem Google Docs vs Opal
Tana
Welcome to the future of work. Build anything. Use it for everything. Kill your SaaS subscriptions.

Compare Tana to Mem or Opal:

Tana vs Mem Tana vs Opal
Miro
Join Millions of users that collaborate from all over the planet using Miro. Experience the power of the #1 visual workspace for innovation. More than 100M users and 250,000 companies are collaborating on the canvas.

Compare Miro to Mem or Opal:

Miro vs Mem Miro vs Opal
Logseq
Logseq is a local-first, non-linear, outliner notebook for organizing and sharing your personal knowledge base.

Compare Logseq to Mem or Opal:

Logseq vs Mem Logseq vs Opal