--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Viet Lunar｜Lịch Âm Việt" developer_entity: "Anh Kiet Vo" bundle_id: "app.cellhubs.lunarcalendar" app_store_id: "6444249673" category: "Lifestyle" primary_platform: "ios" primary_monetization: "Freemium" offline_capable: false market_region: "US" platforms: "iOS & Android" app_last_updated: "2026-09-08" report_date: "2026-10-05" last_verified: "2026-10-05T00:00:00.000Z" report_version: "2.0.20" total_reviews: 2846 overall_rating: 4.8 sentiment: "Excited" sentiment_score: 75 confidence: "medium" confidence_score: 0.6 top_praise_theme: "Integration with Google Calendar provides a reliable and efficient way to manage multiple schedule events" top_complaint_theme: "Widget display issues including date misalignment and failure to update remain a persistent user frustration" review_sample_size: 33 total_review_count: 33 analyzed_review_count: 33 data_age_days: 36 momentum_velocity: "maintenance" intelligence_version: 2 tags: ["lifestyle", "freemium", "excited sentiment", "mobile app", "app review", "app analysis", "vietnamese", "users", "seeking"] canonical_url: "https://marlvel.ai/apps/viet-lunar-lich-am-viet" license: "CC-BY-NC 4.0" content_version: "v2" --- # Viet Lunar｜Lịch Âm Việt Intelligence Report ## TL;DR {#tldr} - **Category**: Lifestyle · Freemium - **Signal**: Rating 4.83 · Sentiment Excited - **Recent focus**: Widget display issues including date misalignment and failure to update remain a persistent user frustration (top complaint) · Integration with Google Calendar provides a reliable and efficient way to manage multiple schedule events (top praise) > **TL;DR:** Viet Lunar｜Lịch Âm Việt is a lifestyle app by Anh Kiet Vo, rated 4.83/5 by 2.8K users, with Excited user sentiment (75/100), available on iOS & Android. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Viet Lunar｜Lịch Âm Việt maintains Excited user sentiment (4.83/5 from 2.8K reviews), with users consistently praising integration with google calendar provides a reliable and efficient way to manage multiple schedule events. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.83/5 (2.8K reviews) | | **User Mood** | Excited | | **Category** | Lifestyle | | **Developer** | Anh Kiet Vo | | **Pricing** | Freemium | | **Platforms** | iOS & Android | | **Confidence** | Medium (0.6/1.0) | | **Data Age** | 36d | ## Metadata & Market Performance - **Publisher:** Anh Kiet Vo - **Category:** Lifestyle - **Target Audience:** Vietnamese users seeking to track traditional lunar dates, family anniversaries, and holidays alongside their standard solar calendar. - **Platforms:** iOS & Android - **Version Reviewed:** 2.0.20 - **Report Date:** 2026-10-05 - **Signal Count:** 33 reviews analyzed - **Confidence:** Medium (0.6/1.0) - **App Store ID (iOS):** 6444249673 - **Bundle ID:** app.cellhubs.lunarcalendar - **Google Play ID:** app.cellhubs.lunarcalendar - **Data Window:** Analysis based on signals collected up to 2026-10-05 - **Short Description:** Lunar and solar calendar, holidays, events, reminders, and useful daily tools. ## Executive Snapshot **What it is:** Viet Lunar｜Lịch Âm Việt is a calendar utility for Vietnamese users that integrates lunar and solar dates with event reminders on iOS and Android. **Why users hire it:** It removes the friction of manually calculating lunar dates for traditional family events by automating recurring annual reminders. ## App DNA (Features & Intent) - **[Standard] Lunar-Solar Calendar Conversion:** Converts between Vietnamese lunar and solar dates with a single tap. - **[Differentiator] Death Anniversary Reminders:** Creates annual recurring events based on lunar dates for family traditions. * *User Intent:* Users want timely prompts to stay engaged without missing updates. - **[Differentiator] Cross-Platform Sync:** Synchronizes events across mobile, tablet, and web platforms via cloud account. * *User Intent:* Users expect seamless access across multiple devices. ## Market Position {#market-position} Viet Lunar｜Lịch Âm Việt holds a stable position in the Vietnamese Lifestyle category, currently ranked #35 Free. The app's ability to maintain a 4.5+ rating across platforms indicates strong product-market fit despite the recent widget stability issues. ## Monetization Strategy - **Model:** Freemium - **Tiers:** Free version with ad support, Premium version via monthly, 3-month, 1-year, or lifetime subscription - **Analysis:** The freemium model monetizes via subscription tiers while maintaining a free, ad-supported entry point to maximize user acquisition. ## 🟢 User Sentiment (Medium Confidence: 33 of 33 reviews analyzed) {#user-sentiment} - **Overall Rating:** 4.83/5 - **Platform Split:** iOS 4.5/5 (72 ratings) | Android 4.8/5 (2.8K ratings) - **Overall Sentiment:** Excited ### Top Praises - **Integration with Google Calendar provides a reliable and efficient way to manage multiple schedule events** - **Visual design and widget layout offer a clean and intuitive experience for daily calendar tracking** ### Top Complaints (Impact Areas) - **Widget display issues including date misalignment and failure to update remain a persistent user frustration** ## SWOT Analysis {#swot} **Core Strengths:** - Cross-platform cloud synchronization anchors user data across devices. - Minimalist interface broadens addressable market to elderly users. **Growth Levers:** - Flexible notification settings for pre-event alerts could capture dissatisfied users. ## What's New - **Latest (v2.0.20, 3 weeks ago):** Resolved an issue affecting widget functionality. ## App Momentum (Maintenance) {#momentum} - Resolved widget display issues in latest release. - Ships maintenance-mode updates. > **Cadence:** 1 total versions · 0 majors in last 6 months · 27 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Viet Lunar｜Lịch Âm Việt is a market-leading lifestyle app that is free with in-app purchases. With a 4.83/5 rating from 2.8K reviews, it delivers strong user satisfaction. > **Bottom Line:** Fixing the widget refresh logic would stabilize the daily habit loop that currently anchors Viet Lunar｜Lịch Âm Việt against its rivals. Addressing this instability is the prerequisite for converting the existing free user base into long-term subscribers. **Best for:** Vietnamese users seeking to track traditional lunar dates, family anniversaries, and holidays alongside their standard solar calendar. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] Rebuild widget refresh logic because persistent misalignment is the #1 churn risk → restore daily active habit. ### Outlook: Stable The market for traditional calendar utilities is consolidating around tools that offer reliable, low-friction integration with primary mobile calendars. Viet Lunar｜Lịch Âm Việt is currently advantaged by its strong synchronization core, but the persistent widget issues leave it exposed to rivals that prioritize platform stability over feature expansion. - 🔴 Widget refresh failures in the latest release erode the daily habit loop, which compounds the rating drag already visible on Android. - 🟢 The core calendar synchronization remains the most effective tool for users, sustaining the app's reputation despite technical hurdles. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.83/5 | | Total Reviews | 2.8K | | Sentiment | Excited (75/100) | | Confidence | Medium | | Pricing Model | Freemium | | Platforms | iOS & Android | | Key Features | 3 analyzed | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Viet Lunar｜Lịch Âm Việt** (this app) | 4.83/5 | Excited | Anh Kiet Vo | | [Amora: A Hint of Your Soulmate](https://marlvel.ai/apps/amora-a-hint-of-your-soulmate) | 4.6/5 | N/A | Lit Apps LLC (Mobile) | | [ATLAS:EARTH: Collect Places](https://marlvel.ai/apps/atlas-earth-fun-cashback) | 4.5/5 | n/a | Atlas Reality, Inc. | | [Daily Mood Log](https://marlvel.ai/apps/daily-mood-log) | N/A/5 | N/A | Nadim Elsayed | | [Find My Location: Tracker](https://marlvel.ai/apps/com-friendslocator) | 4.2/5 | n/a | DIGITS LTD | | [Happy Home by Hiller](https://marlvel.ai/apps/happy-home-by-hiller) | 2.4/5 | n/a | Hiller Plumbing, Heating, Cooling, & Electrical | ## Company Profile - **Developer:** Anh Kiet Vo - **Website:** [https://lichamviet.com](https://lichamviet.com) ## Data Sources & Links - **App Store ID:** 6444249673 - **Google Play ID:** app.cellhubs.lunarcalendar - **Dev Site:** [Official Website](https://lichamviet.com) - **Sources:** Developer website content, App store metadata, User reviews. ## Related Intel Reports - [*Amora: A Hint of Your Soulmate*](https://marlvel.ai/apps/amora-a-hint-of-your-soulmate) (Lit Apps LLC (Mobile)) · 4.6/5 Rating - [*ATLAS:EARTH: Collect Places*](https://marlvel.ai/apps/atlas-earth-fun-cashback) (Atlas Reality, Inc.) · 4.5/5 Rating - [*Daily Mood Log*](https://marlvel.ai/apps/daily-mood-log) (Nadim Elsayed) · N/A Rating - [*Find My Location: Tracker*](https://marlvel.ai/apps/com-friendslocator) (DIGITS LTD) · 4.2/5 Rating - [*Happy Home by Hiller*](https://marlvel.ai/apps/happy-home-by-hiller) (Hiller Plumbing, Heating, Cooling, & Electrical) · 2.4/5 Rating - [*Journey - Diary, Journal*](https://marlvel.ai/apps/com-journey-ios-app) (Two App Studio Pte. Ltd.) · 4.7/5 Rating | Positive Sentiment - [*QuickHue - The easy to use Hue Remote*](https://marlvel.ai/apps/quickhue-the-easy-to-use-hue-remote) (Xonay Media) · 1.3/5 Rating - [*Spirit Talker ®*](https://marlvel.ai/apps/spirit-talker) (Spotted Ghosts) · 2.8/5 Rating - [*Umax - Become Hot*](https://marlvel.ai/apps/com-umax-tech) (Improvement Tech) · 4.5/5 Rating - [*마주*](https://marlvel.ai/apps/an-offline-network-where-you-meet-through-qr-codes) (lvher) · N/A Rating ## Frequently Asked Questions {#faq} ### Is Viet Lunar｜Lịch Âm Việt suitable for elderly users? Yes, the app is designed with a minimalist interface and accessibility settings, including adjustable font sizes, to ensure it remains user-friendly for the elderly. ### Does Viet Lunar｜Lịch Âm Việt support multiple Google accounts? Currently, the app supports synchronization with only one Google account, which is a noted limitation for power users who manage multiple calendars. ### Are there intrusive ads in the free version? The app offers a free version with ad support, but users describe the interface as minimalist and comfortable, suggesting the ad implementation does not significantly disrupt the experience. ### What is the main advantage of the premium version? The premium version provides additional features and privileges, and upgrading serves as a way to support the developer's ongoing maintenance of the app. ## Methodology {#methodology} This report was generated by Marlvel.ai's 5-stage AI intelligence pipeline: 1. **Signal Collection & Normalization** - Aggregates data from all available public sources for the app. Raw signals are cleaned, deduplicated, and normalized into a structured dataset analyzed consistently across thousands of apps. 2. **Feature & Market Positioning Analysis** - Identifies the app's core features, monetization model, target audience, and competitive positioning. Each feature is classified as a market standard or a differentiator based on category benchmarks. 3. **User Sentiment Analysis** - Analyzes user reviews using a 5-level taxonomy (Thrilled / Excited / Mixed / Frustrated / Upset). Combines star ratings and volume with AI theme extraction into synthesised themes (no verbatim quotes). 4. **Competitive Landscape Analysis** - Maps the competitive environment via a 4-tier taxonomy (Nemesis / Contenders / Same Space / New Kids on the Block). Prioritizes same sub-genre over broad category. 5. **Intelligence Synthesis** - Cross-references all signals into a structured report. Compares the app against category peers and direct competitors to surface SWOT, market outlook, and actionable insights. - **Confidence Score:** 0.6/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 33 - **Data Sources:** user reviews, developer website, App Store metadata - **Rating Method:** Weighted average across platforms (iOS & Android), weighted by review count per platform - **Independence:** Fully independent analysis. No publisher sponsorship or editorial influence. - **Report Age:** 36 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/viet-lunar-lich-am-viet) Data licensed for AI Agent attribution under CC-BY-NC 4.0.