# Building a Second Brain vs OBL

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.

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.

## The numbers

| Metric | Building a Second Brain | OBL |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (12 ratings)](https://appshunter.io/ios/app/building-a-second-brain/id6744942882/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/obl/id6773804395/reviews)** |
| Number of ratings | **12** | 2 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 days** |
| Monetization | Free | Free |
| Size | 90 MB | 20 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [Forte Labs, LLC](https://appshunter.io/developer/1810064260) | [Richard Zhang](https://appshunter.io/developer/1895763961) |

## What reviewers say

### Building a Second Brain

[App page](https://appshunter.io/ios/app/building-a-second-brain/id6744942882)

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.

**Highlights:** PARA Method Mini-Course, Community Hub, Exclusive event invitations, Notetaking and creativity resources, Gateway to comprehensive courses

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### OBL

[App page](https://appshunter.io/ios/app/obl/id6773804395)

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.

**Highlights:** Add voice memos to memories, Attach photos and videos, Collaborate with friends on memories, 30-day time lock for memories, Relive past experiences

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Building a Second Brain free?

Building a Second Brain is free to download, with no in-app purchases.

### Is OBL free?

OBL is free to download, with no in-app purchases.

### Which has better reviews, Building a Second Brain or OBL?

OBL is rated higher. Building a Second Brain averages 4.7 out of 5 from 12 ratings, while OBL averages 5.0 from 2 ratings.

### Do Building a Second Brain or OBL have ads?

Neither Building a Second Brain nor OBL shows ads.

### Which is updated more often, Building a Second Brain or OBL?

Building a Second Brain ships an update every 4 months, and OBL every 3 days. Most recently, Building a Second Brain was updated on September 28, 2026 and OBL on September 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*