# DoCube vs LightCal²

The clearest difference is review sentiment: DoCube at 100% against LightCal²'s 68%. DoCube also leads on iOS requirement (17.0 vs 26.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. DoCube sells 1 one-off in-app purchase and LightCal² sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

DoCube ships an update every 3 weeks, LightCal² fortnightly. The most recent releases landed on October 6, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | DoCube | LightCal² |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (11 ratings)](https://appshunter.io/ios/app/docube-pdf-reader-and-notes/id6470183496/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | **100.0% of reviews** | 67.6% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 91 MB | 111 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [巍 赵](https://appshunter.io/developer/1686869575) | [Qingyun Software Studio](https://appshunter.io/developer/1513505692) |

## What reviewers say

### DoCube

[App page](https://appshunter.io/ios/app/docube-pdf-reader-and-notes/id6470183496)

This app transforms reading into knowledge retention with features like multi-tab browsing, precise document navigation, and versatile annotation tools. It supports various formats and converts highlights into flashcards for effective memorization and review.

**Highlights:** Multi-tab reading for multiple documents, Precise document positioning and history navigation, Support for PDF, EPUB, Markdown, and web pages, Six annotation tools including highlights and notes, Cross-document linking for knowledge networks, Automatic flashcard creation from highlights, AI-enhanced card generation

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full-platform Professional Edition | $34.99 | one-time |


### LightCal²

[App page](https://appshunter.io/ios/app/lightcal-calendar/id6758233602)

This minimalist calendar app helps you manage your schedule and visualize important dates. It offers countdowns to future events and the ability to add special markers to specific days, bringing a sense of ritual to your time.

**Highlights:** Countdown to future events, Count up from past events, Date badges for special days, Detailed date information, Schedule management, Minimalist design

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | per month |
| Annual | $1.99 | per year |
| Lifetime | $4.99 | one-time |


## Frequently asked questions

### Is DoCube free?

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

### Is LightCal² free?

LightCal² is free to download, with in-app purchases available.

### Do DoCube or LightCal² have ads?

Neither DoCube nor LightCal² shows ads.

### Which is updated more often, DoCube or LightCal²?

DoCube ships an update every 3 weeks, and LightCal² fortnightly. Most recently, DoCube was updated on October 6, 2026 and LightCal² on October 13, 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.*