# Lock Screen Calendar vs Second Brain Joiner

The clearest difference is price: Lock Screen Calendar at Free against Second Brain Joiner's $3.99. Lock Screen Calendar also leads on update cadence (every 3 days vs every 3 weeks). Second Brain Joiner's advantage is in-app purchases (none vs 7) and review sentiment (100% vs 88%). On ads, device support and iOS requirement there is nothing between them.

Lock Screen Calendar is free to download; Second Brain Joiner costs $3.99 up front. Lock Screen Calendar sells 7 in-app purchases, starting at $4.49 per month. Second Brain Joiner asks for nothing beyond the download.

Lock Screen Calendar ships an update every 3 days, Second Brain Joiner every 3 weeks. The most recent releases landed on October 12, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Lock Screen Calendar | Second Brain Joiner |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[5.0 (19 ratings)](https://appshunter.io/ios/app/lock-screen-calendar-coretask/id6478839577/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 88.2% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 3 weeks |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 38 MB | 11 MB |
| Requires iOS | **18.0** | 18.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Gridus Co.](https://appshunter.io/developer/1636121761) | [Hirofumi Inoue](https://appshunter.io/developer/1886583968) |

## What reviewers say

### Lock Screen Calendar

[App page](https://appshunter.io/ios/app/lock-screen-calendar-coretask/id6478839577)

This app helps you manage your time and overcome procrastination by organizing tasks based on importance and urgency. It offers a focus timer to help you complete tasks efficiently and reduce stress.

**Highlights:** Priority setting by importance and urgency, Step-by-step task organization, Time allocation for tasks, Focus timer for task completion, Stress reduction and productivity boost

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $4.49 | per month |
| Weekly Plan | $4.49 | per 7 days |
| Monthly Plan | $5.99 | per month |
| Annual Plan | $29.99 | per year |
| Annual Plan | $39.99 | per year |
| Lifetime Plan | $29.99 | one-time |
| Lifetime Plan | $59.99 | one-time |


### Second Brain Joiner

[App page](https://appshunter.io/ios/app/second-brain-joiner/id6760870675)

This tool optimizes AI input by merging and formatting Markdown notes. It intelligently filters content, calculates optimal chunk sizes for AI context windows, and maintains original file structure for enhanced AI accuracy and security.

**Highlights:** Advanced filtering by tags and dates, High-precision token calculation, Smart chunking for AI context limits, Local-first absolute security, Folder structure maintenance, Timestamping for context

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

**In-app purchases:** none


## Frequently asked questions

### Is Lock Screen Calendar free?

Lock Screen Calendar is free to download, with in-app purchases available.

### Is Second Brain Joiner free?

Second Brain Joiner costs $3.99, with no in-app purchases.

### Do Lock Screen Calendar or Second Brain Joiner have ads?

Neither Lock Screen Calendar nor Second Brain Joiner shows ads.

### Which is updated more often, Lock Screen Calendar or Second Brain Joiner?

Lock Screen Calendar ships an update every 3 days, and Second Brain Joiner every 3 weeks. Most recently, Lock Screen Calendar was updated on October 12, 2026 and Second Brain Joiner on October 8, 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.*