# Clerk App vs D

The clearest difference is in-app purchases: D at none against Clerk App's 3. Clerk App's advantage is ads (none vs shown) and update cadence (every 3 days vs every 2 months). On price, review sentiment, device support and iOS requirement there is nothing between them.

Both are free to download. Clerk App sells 3 in-app purchases, starting at $4.99 per month. D asks for nothing beyond the download.

Clerk App ships an update every 3 days, D every 2 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Clerk App | D |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (20 ratings)](https://appshunter.io/ios/app/clerk-app/id6758461193/reviews)** | — |
| Number of ratings | **20** | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 3 days** | Every 2 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 47 MB | 28 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Robert Contento](https://appshunter.io/developer/1873040995) | [SiU Ahn](https://appshunter.io/developer/1601025745) |

## What reviewers say

### Clerk App

[App page](https://appshunter.io/ios/app/clerk-app/id6758461193)

This app is an adaptive study planner designed for medical students. It integrates question banks, flashcards, review materials, and practice exams into a real-time system that adjusts your daily study plan based on your progress and deadlines. It also offers tools for focus, productivity, and community interaction.

**Highlights:** Adaptive daily study planning, Unified resource tracking, Interactive study calendar, Study groups and community, Focus and productivity tools, Pomodoro timer

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Clerk App Monthly Subscription | $4.99 | per month |
| Clerk App Yearly Subscription | $19.99 | per year |
| Clerk App Lifetime Plan | $29.99 | one-time |


### D

[App page](https://appshunter.io/ios/app/d-day-counter-countdowns/id6787755137)

Organize all your important dates, from exams and anniversaries to birthdays and deadlines. Track upcoming events with customizable countdowns and view them on your home screen or calendar. Stay motivated with progress tracking and enjoy a private, offline experience.

**Highlights:** Unlimited D-day creation, Customizable categories, Yearly repeating event support, Home screen widgets, Calendar view, Statistics and progress rings, Offline and private usage

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

**In-app purchases:** none


## Frequently asked questions

### Is Clerk App free?

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

### Is D free?

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

### Do Clerk App or D have ads?

D shows ads; Clerk App does not.

### Which is updated more often, Clerk App or D?

Clerk App ships an update every 3 days, and D every 2 months. Most recently, Clerk App was updated on October 23, 2026 and D 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.*