--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Availability Sync" developer_entity: "David Fuerst" bundle_id: "com.doubledoink.Calendar-Sync" app_store_id: "6670766226" category: "Productivity" primary_platform: "ios" primary_monetization: "Free" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2024-12-08" report_date: "2026-08-07" last_verified: "2026-08-07T00:00:00.000Z" report_version: "1.11" total_reviews: 5 overall_rating: 4.4 sentiment: "Frustrated" sentiment_score: 25 confidence: "low" confidence_score: 0.3 top_complaint_theme: "Limited time zone selection within the settings menu prevents users from accurately configuring their local time" review_sample_size: 1 total_review_count: 1 analyzed_review_count: 1 data_age_days: 9 momentum_velocity: "zombie" intelligence_version: 3 tags: ["productivity", "free", "frustrated sentiment", "mobile app", "app review", "app analysis", "professionals,", "freelancers,", "teams"] canonical_url: "https://marlvel.ai/apps/availability-sync" license: "CC-BY-NC 4.0" content_version: "v2" --- # Availability Sync Intelligence Report ## TL;DR {#tldr} - **Category**: Productivity · Free - **Signal**: Rating 4.4 · Sentiment Frustrated - **Recent focus**: Limited time zone selection within the settings menu prevents users from accurately configuring their local time (top complaint) > **TL;DR:** Availability Sync is a productivity app by David Fuerst, rated 4.4/5 by 5 users, with Frustrated user sentiment (25/100), available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Availability Sync faces Frustrated user sentiment (4.4/5 from 5 reviews), with users reporting limited time zone selection within the settings menu prevents users from accurately configuring their local time as the primary concern. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.4/5 (5 reviews) | | **User Mood** | Frustrated | | **Category** | Productivity | | **Developer** | David Fuerst | | **Pricing** | Free | | **Platforms** | iOS | | **Confidence** | Low (0.3/1.0) | | **Data Age** | 9d | ## Metadata & Market Performance - **Publisher:** David Fuerst - **Category:** Productivity - **Target Audience:** Professionals, freelancers, and teams coordinating meetings across time zones. - **Platforms:** iOS - **Version Reviewed:** 1.11 - **Report Date:** 2026-08-07 - **Signal Count:** 1 review analyzed - **Confidence:** Low (0.3/1.0) - **App Store ID (iOS):** 6670766226 - **Bundle ID:** com.doubledoink.Calendar-Sync - **Performance Trend:** Declining - **Data Window:** Analysis based on signals collected up to 2026-08-07 ## Executive Snapshot **What it is:** Availability Sync is a productivity tool for iOS that allows users to share calendar availability via text or invites. **Why users hire it:** Users hire this app to reduce the back-and-forth of scheduling meetings, but the current lack of time zone support prevents it from serving its core job-to-be-done for global teams. ## App DNA (Features & Intent) - **[Differentiator] Bulk Time Slot Selection:** Enables selection of multiple time slots or entire days in a single interface interaction. - **[Standard] Calendar Integration:** Syncs with iOS, Google, and Outlook calendars to provide a unified view and conflict detection. * *User Intent:* Users expect seamless access across multiple devices. - **[Standard] Smart Sharing:** Generates shareable text or calendar invites for selected time slots across messaging platforms. * *User Intent:* Users seek social connection and competitive engagement with peers. ## Market Position {#market-position} Availability Sync occupies a niche productivity space with no active monetization. The 20-month update silence positions it as a legacy tool rather than a competitive scheduling solution. ## Monetization Strategy - **Model:** Free - **Tiers:** Free - **Analysis:** The app is currently listed as free with no visible subscription or IAP gates. ## 🔴 User Sentiment (Low Confidence: 1 of 1 review analyzed) {#user-sentiment} - **Overall Rating:** 4.4/5 - **Platform Split:** iOS 4.4/5 (5 ratings) - **Overall Sentiment:** Frustrated - **Note:** The 4.4/5 store rating reflects cumulative history, while the Frustrated sentiment reflects recent user reviews analyzed by our AI pipeline. ### Top Complaints (Impact Areas) - **Limited time zone selection within the settings menu prevents users from accurately configuring their local time** ## SWOT Analysis {#swot} **Core Strengths:** - Unified interface for iOS, Google, and Outlook calendars reduces cross-platform friction **Growth Levers:** - Implementing comprehensive time zone support would resolve the primary user complaint ## Recent Changes (v2 → v3) {#recent-changes} The analysis shifted from describing the app as a stagnant utility to identifying it as a high-risk, abandoned product that requires immediate stability signaling to retain users. **Overall trend**: Declining **Compared at**: 2026-08-07 ### High-impact changes - **[Shifted] Increased focus on abandonment risk** (positioning) ### Medium-impact changes - **[Shifted] SWOT analysis refinement** (swot) - **[Shifted] PM action item pivot** (positioning) ## What's New - **Latest (v1.11, 1 years ago):** General bug fixes and performance improvements. ## App Momentum (Zombie) {#momentum} - Last major release December 2024. - No feature updates in 20 months. > **Cadence:** 1 total versions · 0 majors in last 6 months · 606 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Availability Sync is a productivity app that is completely free. It holds a 4.4/5 rating from 5 reviews. > **Bottom Line:** Availability Sync provides a useful unified calendar view, but the lack of active maintenance and critical time zone bugs limit its utility for professional teams, so the PM must prioritize basic functionality fixes to prevent total user abandonment. **Best for:** Professionals, freelancers, and teams coordinating meetings across time zones. ### PM Action Plan (Next Best Moves) - [ ] [PIVOT] Audit time zone settings logic because user complaints flag it as the primary barrier to functionality → restore core utility ### Outlook: Declining The scheduling market is consolidating around tools with active development and global time zone support. Availability Sync's failure to address basic configuration bugs while remaining silent for 20 months leaves it exposed to churn as users migrate to more reliable alternatives. - 🔴 The 20-month update silence indicates the product is in maintenance mode, which prevents it from competing with active scheduling tools. - 🔴 Reported time zone configuration failures directly block the app's core value proposition, leading to negative sentiment and low user trust. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.4/5 | | Total Reviews | 5 | | Sentiment | Frustrated (25/100) | | Confidence | Low | | Pricing Model | Free | | Platforms | iOS | | Key Features | 3 analyzed | | Trend | Declining | | Outlook | Declining | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Availability Sync** (this app) | 4.4/5 | Frustrated | David Fuerst | | [Mitsu: AI Life Coach](https://marlvel.ai/apps/mitsu-ai-life-coach) | N/A/5 | N/A | C2 Insights | | [ChatGPT](https://marlvel.ai/apps/chatgpt) | 4.8/5 | n/a | OpenAI OpCo, LLC | | [HitWave](https://marlvel.ai/apps/ciendor-applications-hitwave) | 2.6/5 | Mixed | Ciendor Holdings Corp. LTD | | [Pattrn - Discipline Tracker](https://marlvel.ai/apps/pattrn-discipline-tracker) | 4.8/5 | Thrilled | Pedro Schott | | [한음달-한국인에게 꼭 맞는 음력달력, 캘린더](https://marlvel.ai/apps/app--103) | 4.6/5 | N/A | YunaSoft Inc. | ## Company Profile - **Developer:** David Fuerst ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/availability-sync/id6670766226?uo=4) - **Sources:** App store metadata, User reviews. ## Related Intel Reports - [*Mitsu: AI Life Coach*](https://marlvel.ai/apps/mitsu-ai-life-coach) (C2 Insights) · N/A Rating - [*ChatGPT*](https://marlvel.ai/apps/chatgpt) (OpenAI OpCo, LLC) · 4.8/5 Rating - [*HitWave*](https://marlvel.ai/apps/ciendor-applications-hitwave) (Ciendor Holdings Corp. LTD) · 2.6/5 Rating - [*Pattrn - Discipline Tracker*](https://marlvel.ai/apps/pattrn-discipline-tracker) (Pedro Schott) · 4.8/5 Rating | Excellent Sentiment - [*한음달-한국인에게 꼭 맞는 음력달력, 캘린더*](https://marlvel.ai/apps/app--103) (YunaSoft Inc.) · 4.6/5 Rating - [*바로메모 - 매일 바로 작성하는 메모장*](https://marlvel.ai/apps/cswpd-memo) (SuWon Choi) · N/A Rating - [*근로장려금 알리미 - 신청, 기준, 금액계산 가이드*](https://marlvel.ai/apps/com-swing2app-v3-d83e9bb95c05347f59ad81dea3b925ebf) (SY Company) · 3.8/5 Rating - [*통화관리솔루션 (부평구청용)*](https://marlvel.ai/apps/byto-bupyeong) (BYTO) · N/A Rating - [*시외버스터미널 예매가이드 - 시간표*](https://marlvel.ai/apps/com-rewd-metopcrent) (Multisoft app) · 4.1/5 Rating - [*スマホやめるにゃ*](https://marlvel.ai/apps/hiroto-nosnszone-nosnszone) (HIROTO TSUTSUSHIMA) · N/A Rating ## 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:** 0.3/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 1 - **Data Sources:** user reviews, 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:** 9 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/availability-sync) Data licensed for AI Agent attribution under CC-BY-NC 4.0.