# Lock Screen Calendar vs 챌린지 디데이

The clearest difference is update cadence: 챌린지 디데이 at daily against Lock Screen Calendar's every 5 days. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Lock Screen Calendar sells 7 in-app purchases, starting at $4.49 per month and 챌린지 디데이 sells 6 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Lock Screen Calendar ships an update every 5 days, 챌린지 디데이 daily. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Lock Screen Calendar | 챌린지 디데이 |
| --- | --- | --- |
| Price | Free | Free |
| 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 | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 38 MB | 140 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Gridus Co.](https://appshunter.io/developer/1636121761) | [Mincheol Chae](https://appshunter.io/developer/6812431161) |

## 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 |


### 챌린지 디데이

[App page](https://appshunter.io/ios/app/d-day/id6812431159)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fantasy Sets | $0.49 | one-time |
| Outings & Seasons Sets | $0.99 | one-time |
| Sports Sets | $0.99 | one-time |
| Daily & Hobbies Sets | $1.99 | one-time |
| Animal Sets | $2.99 | one-time |
| Full Bundle | $4.99 | one-time |


## Frequently asked questions

### Is Lock Screen Calendar free?

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

### Is 챌린지 디데이 free?

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

### Do Lock Screen Calendar or 챌린지 디데이 have ads?

Neither Lock Screen Calendar nor 챌린지 디데이 shows ads.

### Which is updated more often, Lock Screen Calendar or 챌린지 디데이?

Lock Screen Calendar ships an update every 5 days, and 챌린지 디데이 daily. Most recently, Lock Screen Calendar was updated on October 30, 2026 and 챌린지 디데이 on October 24, 2026.

---

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