# kuStudy vs D

The clearest difference is rating: D at 5.0 against kuStudy's 4.4. D also leads on in-app purchases (none vs 10). kuStudy's advantage is update cadence (every 4 weeks vs every 3 months) and ratings volume (7 vs 1). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. kuStudy sells 10 in-app purchases, starting at $2.99 per 7 days. D asks for nothing beyond the download.

D holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: kuStudy has 7 ratings behind it against 1, so its average is the more settled of the two.

kuStudy ships an update every 4 weeks, D every 3 months. The most recent releases landed on September 7, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | kuStudy | D |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (7 ratings)](https://appshunter.io/ios/app/kustudy/id925255895/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/d-day-countdown/id1518400866/reviews)** |
| Number of ratings | **7** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 4 MB | 7 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad, Apple Watch, Vision Pro** | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Bummo.Dev](https://appshunter.io/developer/918897632) | [Si-Wan Yoon](https://appshunter.io/developer/1493152910) |

## What reviewers say

### kuStudy

[App page](https://appshunter.io/ios/app/kustudy/id925255895)

Find available study spaces and empty seats in university libraries in real-time. Access information quickly through widgets on your phone, watch, or even spatial computing devices. Seamlessly share status updates and navigate without interrupting your workflow.

**Highlights:** Real-time seat availability, Home screen and lock screen widgets, Apple Watch complications, Handoff support across devices, Split View and Slide Over for iPad, Spatial computing vision support

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $2.99 | per 7 days |
| Monthly Subscription | $4.99 | per month |
| Quarterly Subscription | $9.99 | per 3 months |
| Semiannual Subscription | $12.99 | per 6 months |
| Yearly Subscription | $14.99 | per year |
| Gratitude | $0.99 | one-time |
| Chocolate | $1.99 | one-time |
| Coffee | $2.99 | one-time |
| Lunch | $4.99 | one-time |
| Special Thanks | $8.99 | one-time |


### D

[App page](https://appshunter.io/ios/app/d-day-countdown/id1518400866)

Easily set and track important dates, such as D-Day. This utility app helps you monitor the remaining time until your specified events.

**Highlights:** Set D-Day, Check remaining time, Event tracking, Simple interface

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is kuStudy free?

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

### Is D free?

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

### Which has better reviews, kuStudy or D?

D is rated higher. kuStudy averages 4.4 out of 5 from 7 ratings, while D averages 5.0 from 1 ratings.

### Do kuStudy or D have ads?

Neither kuStudy nor D shows ads.

### Which is updated more often, kuStudy or D?

kuStudy ships an update every 4 weeks, and D every 3 months. Most recently, kuStudy was updated on September 7, 2026 and D on September 23, 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.*