# Unique Days vs PaperDue

The clearest difference is monetization model: PaperDue at free against Unique Days's free with in-app purchases. PaperDue also leads on update cadence (weekly vs monthly). Unique Days's advantage is iOS requirement (12.0 vs 18.6). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Unique Days sells 1 one-off in-app purchase and PaperDue sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Unique Days against 5.0 for PaperDue. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Unique Days ships an update monthly, PaperDue weekly. The most recent releases landed on September 23, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Unique Days | PaperDue |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/unique-days/id6737198411/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/paperdue-deadline-tracker/id6761820921/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 61 MB | 3 MB |
| Requires iOS | **12.0** | 18.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [培钦 康](https://appshunter.io/developer/1770425492) | [梓豪 朱](https://appshunter.io/developer/1891542786) |

## What reviewers say

### Unique Days

[App page](https://appshunter.io/ios/app/unique-days/id6737198411)

Easily track and countdown to important dates with a user-friendly interface and customizable widgets. Visualize upcoming events with a calendar view and enjoy local data storage for privacy and offline access.

**Highlights:** Home screen widgets, Countdown timers, Event reminders, Customizable backgrounds, Calendar view, Local data storage, Intuitive interface

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 终身会员 | $0.99 | one-time |


### PaperDue

[App page](https://appshunter.io/ios/app/paperdue-deadline-tracker/id6761820921)

Never miss a crucial submission deadline for AI research conferences. This app provides live countdowns, smart notifications, and conference rankings to help academics stay organized and focused on their work.

**Highlights:** Live countdown tracker for hundreds of conferences, Smart reminder notifications, CORE & CCF conference rankings, Dynamic Island countdown ticker, Home & Lock Screen widgets, Timeline & calendar view, Multi-timezone support

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PaperDue Pro | $1.99 | one-time |


## Frequently asked questions

### Is Unique Days free?

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

### Is PaperDue free?

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

### Which has better reviews, Unique Days or PaperDue?

Unique Days and PaperDue are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Unique Days or PaperDue have ads?

Neither Unique Days nor PaperDue shows ads.

### Which is updated more often, Unique Days or PaperDue?

Unique Days ships an update monthly, and PaperDue weekly. Most recently, Unique Days was updated on September 23, 2026 and PaperDue on October 5, 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.*