DoCube vs LightCal²
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DoCube
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.
- 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
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DoCube is a multi-format reader and personal knowledge base built for deep reading. Bring PDFs, EPUBs, local videos, web snapshots, Markdown, and organized scanned documents into one library. Annotate, link, search, translate, export, and review while you read or watch. Your materials are not merely stored—they gradually become knowledge you can retrieve, connect, and remember. 【Deep Reading Across Formats】 DoCube supports PDFs, EPUBs, local videos, offline webpages, Markdown, and parsed documents. Whether you work with research papers, ebooks, web articles, course videos, lectures, interviews, or your own Markdown notes, you can read, watch, and manage them together in DoCube. 【Deep Study for Video】 Import local videos and study courses, lectures, and interviews as deeply as documents. DoCube can read embedded subtitles and, on supported devices, generate subtitles for videos that do not have them. Search subtitles; switch between original, translated, and bilingual views; annotate subtitles; use chapter outlines, playback speeds, and A/B looping. Open a search result, annotation, or chapter to return to the exact moment, turning video into knowledge you can retrieve, connect, and review. 【Multi-Tab Reading】 Open multiple documents and videos in tabs, just like a browser, and switch quickly between materials. Read a paper, compare references, watch a course, or return to where you left off without losing context. 【Annotations and Notes in Context】 Use highlights, underlines, strikethroughs, quotations, links, and Markdown notes directly on source text or at a precise location in video subtitles. Your thinking stays connected to its context. 【Link Materials Together】 DoCube can link an annotation in a document or video to a precise location in another resource. Connect scattered chapters, paragraphs, webpages, video clips, and notes into your own paths through knowledge. 【Search What You Have Read and Watched】 Search not only titles and body text, but also video subtitles, highlights, quotations, links, notes, and cards. Anything you have read, watched, marked, or written can help you find the right material again. 【Keep Reading in Other Languages】 Translate selected text while reading. Some document types support full-document translation and translated exports, while videos support subtitle translation and original, translated, or bilingual display. Read foreign papers, webpages, ebooks, and course videos without constantly switching tools. 【From Annotation to Review】 Turn important content from documents and videos into review cards. Flip cards, mask cards, and review plans bring what you have read and watched back at the right time, instead of letting it disappear after you finish. 【Export and Sync】 Export document content and translations to common formats, including bilingual versions. DoCube is available on iPhone, iPad, and Mac, with iCloud sync and local Wi-Fi transfer. Ideal for: - People who read research papers and professional materials - Learners organizing PDFs, EPUBs, webpages, Markdown, and videos - People who study long-term with course, lecture, and interview videos - Deep readers who want annotations, notes, and review in one loop - Anyone building a personal knowledge base instead of merely collecting files The free version manages up to 5 documents and lets you experience the core reading and knowledge-management workflow. Upgrade to Pro to remove the document limit and build an unrestricted personal library.
LightCal²
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.
- Countdown to future events
- Count up from past events
- Date badges for special days
- Detailed date information
- Schedule management
- Minimalist design
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“What’s on the schedule today?” “How many days until the next anniversary?” LightCal² is a minimalist calendar app that brings multiple features together in one clean experience. View detailed date information at a glance. Comprehensive schedule management is built in. 【Countdown】 See exactly how far every special day is from today. “We’ve known each other for over two thousand days…” “Only a few days left before the exam…” “My child’s birthday is coming up — time to prepare a gift.” Whether counting down to the future or counting up from the past, every meaningful moment stays clear and visible. 【Date Badges】 Anchor meaningful moments directly onto specific dates. Add special markers to days that matter — small signs of a life well lived. “Maybe this would be perfect for marking work shifts…” “Our holiday schedule is a little different — better mark it.” Every ordinary day deserves to be taken seriously. With a clean and thoughtful design, LightCal² brings a sense of ritual to your time. More features are already on the way. If you have ideas or suggestions, feel free to reach out: dayscalendar@126.com Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://oceanic-scent-400.notion.site/Privacy-Policy-308b4bef53958043b3e7c99c6160dae4?pvs=74
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | DoCube | LightCal² |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (11 ratings) — better | — |
| Positive reviews | 100.0% of reviews — better | 67.6% of reviews |
| Number of ratings | 11 — better | — |
| Update frequency | Every 3 weeks | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, Mac — better | iPhone, iPad |
| Requires iOS | 17.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 91 MB | 111 MB |
| Age rating | 17+ | 4+ |
| Developer | 巍 赵 | Qingyun Software Studio |
Customer experience
DoCube
LightCal²
In-app purchases
DoCube
- Full-platform Professional Edition$34.99
LightCal²
- Monthly14 Days trial$0.991 Month
- Annual14 Days trial$1.991 Year
- Lifetime$4.99









