# 2ndBrain vs LumenDoc

The clearest difference is update cadence: 2ndBrain at every 5 weeks against LumenDoc's every 3 months. 2ndBrain also leads on iOS requirement (11.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 2ndBrain sells 9 in-app purchases, starting at $1.99 per 7 days and LumenDoc sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

2ndBrain ships an update every 5 weeks, LumenDoc every 3 months. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 2ndBrain | LumenDoc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/lumendoc-ai-document-chat/id6757917138/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 3 months |
| Monetization | — | Freemium |
| Size | 79 MB | 7 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shajeel Afzal](https://appshunter.io/developer/1489212410) | [David Mendez](https://appshunter.io/developer/1869594292) |

## What reviewers say

### 2ndBrain

[App page](https://appshunter.io/ios/app/2ndbrain-ai-powered-chatbot/id6446216874)

**Features:** macOS Compatibility

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $1.99 | per 7 days |
| .Weekly Subscription | $2.99 | per 7 days |
| Weekly Subscription. | $3.99 | per 7 days |
| Monthly Subscription. | $4.99 | per month |
| Monthly Subscription. | $5.99 | per month |
| Monthly Subscription. | $6.99 | per month |
| Quarterly Subscription. | $13.99 | per 3 months |
| Quarterly Subscription. | $14.99 | per 3 months |
| Quarterly Subscription. | $17.99 | per 3 months |


### LumenDoc

[App page](https://appshunter.io/ios/app/lumendoc-ai-document-chat/id6757917138)

Transform your paperwork into a searchable digital library. Scan documents, extract key information with AI, and ask questions to find details instantly. Set reminders for important dates and track spending without linking bank accounts.

**Highlights:** Scan documents with AI Vision, Ask questions about your documents, Track spending from receipts, Set reminders and calendar events, Private iCloud backup (Pro), On-device OCR fallback

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LumenDoc Pro | $4.99 | per month |
| LumenDoc Pro Yearly | $39.99 | per year |


## Frequently asked questions

### Is 2ndBrain free?

2ndBrain is free to download, with in-app purchases available.

### Is LumenDoc free?

LumenDoc is free to download, with in-app purchases available.

### Do 2ndBrain or LumenDoc have ads?

Neither 2ndBrain nor LumenDoc shows ads.

### Which is updated more often, 2ndBrain or LumenDoc?

2ndBrain ships an update every 5 weeks, and LumenDoc every 3 months. Most recently, 2ndBrain was updated on October 30, 2026 and LumenDoc on October 24, 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.*