Building a Second Brain vs OBL
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Building a Second Brain
This app helps you manage information overload and achieve your goals through personal knowledge management. Connect with a community focused on productivity and digital organization for a more peaceful and purposeful life.
- PARA Method Mini-Course
- Community Hub
- Exclusive event invitations
- Notetaking and creativity resources
- Gateway to comprehensive courses
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Building a Second Brain is your learning community to help you transform information overload into clarity and consistent progress toward your most important goals. Here, you’ll connect with individuals who thoughtfully turn productivity, personal knowledge management, and digital organization into tools for living a more peaceful, purposeful, and fulfilling life. WHAT’S INSIDE: PARA Method Mini-Course: Learn the simple, intuitive system to tame your digital chaos and find any information right when you need it. Community Hub: Get exclusive event invitations, updates, and content—including videos and resources focused on all things notetaking, creativity, and working more intentionally. Gateway to Learning: The app is your entry point into our comprehensive courses and broader community of like-minded learners. When you master the flow of information through your life, you can accomplish anything you set your mind to. But if you continue to rely on your fragile biological brain, you’ll likely become ever more overwhelmed by the explosive growth in the complexity of your life. Download the app and start building your Second Brain today.
OBL
Capture and relive your most cherished moments by adding voice memos, photos, and videos to them. Share these experiences with friends and collectively build a richer tapestry of memories. A 30-day time lock encourages focus on creating new experiences rather than dwelling on the immediate past.
- Add voice memos to memories
- Attach photos and videos
- Collaborate with friends on memories
- 30-day time lock for memories
- Relive past experiences
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I don't want to keep loosing memories. Sometimes I look back at old photos and I can barely remember happened, eventually, I even forget how I felt in the moment. I wish I could revisit those memories and know how it sounded like, how it looked and what was going on. So that's what Obambulare lets you do, it allows you to add voice memos, photos and videos to a moment. Then you can add friends to contribute too, can you imagine getting to experience everyone's presence and feelings like you were right there. Because It's so real, there is a time lock of 30 days so you're not focused on the immediate past and you can go and make more memories instead of focusing on the imperfections.
Screenshots
Verdict
The clearest difference is review sentiment: OBL at 100% against Building a Second Brain's 50%. OBL also leads on update cadence (every 3 days vs every 4 months) and rating (5.0 vs 4.7). Building a Second Brain's advantage is ratings volume (12 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
OBL holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Building a Second Brain has 12 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 50% of Building a Second Brain's written reviews are positive against 100% of OBL's.
Building a Second Brain ships an update every 4 months, OBL every 3 days. The most recent releases landed on September 28, 2026 and September 10, 2026 respectively.
| Parameter | Building a Second Brain | OBL |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (12 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 50.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 12 — better | 2 |
| Update frequency | Every 4 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.4 | 15.0 — better |
| Further details — not scored | ||
| Size | 90 MB | 20 MB |
| Age rating | 17+ | 12+ |
| Developer | Forte Labs, LLC | Richard Zhang |
Customer experience
Building a Second Brain
OBL
In-app purchases
Building a Second Brain
No in-app purchases
OBL
No in-app purchases









