--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Solid Calendar" developer_entity: "Solid Apps S.R.L." bundle_id: "app.Solid-Calendar" app_store_id: "6448245807" category: "Productivity" primary_platform: "ios" primary_monetization: "Paid" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2025-12-03" report_date: "2026-10-28" last_verified: "2026-10-28T00:00:00.000Z" report_version: "2.76" total_reviews: 114 overall_rating: 4.9 confidence: "low" confidence_score: 0.25 data_age_days: 17 momentum_velocity: "steady" intelligence_version: 4 nemesis: "CalenGoo - Calendar and Tasks" competitor_count: 11 tags: ["productivity", "paid", "mobile app", "app review", "app analysis", "professionals,", "students,", "shift-workers"] canonical_url: "https://marlvel.ai/apps/solid-calendar" license: "CC-BY-NC 4.0" content_version: "v2" --- # Solid Calendar Intelligence Report ## TL;DR {#tldr} - **Category**: Productivity · Paid - **Signal**: Rating 4.89 > **TL;DR:** Solid Calendar is a productivity app by Solid Apps S.R.L., rated 4.89/5 by 114 users, available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Solid Calendar is a productivity app by Solid Apps S.R.L.. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.89/5 (114 reviews) | | **Category** | Productivity | | **Developer** | Solid Apps S.R.L. | | **Pricing** | Paid | | **Platforms** | iOS | | **Confidence** | Low (0.25/1.0) | | **Data Age** | 17d | ## Metadata & Market Performance - **Publisher:** Solid Apps S.R.L. - **Category:** Productivity - **Target Audience:** Professionals, students, and shift-workers seeking a simple, subscription-free alternative to native calendar applications. - **Platforms:** iOS - **Version Reviewed:** 2.76 - **Report Date:** 2026-10-28 - **Signal Count:** 5 reviews analyzed - **Confidence:** Low (0.25/1.0) - **App Store ID (iOS):** 6448245807 - **Bundle ID:** app.Solid-Calendar - **Performance Trend:** Mixed - **Data Window:** Analysis based on signals collected up to 2026-10-28 ## Executive Snapshot **What it is:** Solid Calendar is a productivity app for iOS, iPadOS, and macOS that manages events, tasks, and rotating schedules through a one-time purchase model. **Why users hire it:** It removes the financial friction of recurring subscriptions, serving users who prioritize data privacy by keeping all information on the local device. ## App DNA (Features & Intent) - **[Standard] Natural Language Input:** Conversational event creation reduces scheduling friction. - **[Standard] Rotating Schedule Manager:** Supports shift-based work patterns for non-office professionals. * *User Intent:* Users seek enhanced value through premium features. - **[Differentiator] One-time Purchase Model:** Eliminates subscription fatigue for productivity users. * *User Intent:* Users seek enhanced value through premium features. ## Market Position {#market-position} Solid Calendar maintains a niche position by avoiding subscription models, a strategy that contrasts with the broader productivity category. The $4.99 price point provides a clear value proposition for users who prioritize ownership over recurring access. ## Monetization Strategy - **Model:** Paid - **Tiers:** $4.99 one-time purchase - **Price:** iOS: $4.99 - **Analysis:** The $4.99 one-time purchase model acts as a primary differentiator against subscription-heavy productivity competitors. ## SWOT Analysis {#swot} **Core Strengths:** - One-time purchase model removes recurring cost friction - Local-only data storage ensures privacy compliance **Growth Levers:** - Expand shift-management features to displace regional-specific competitors ## Recent Changes (v3 → v4) {#recent-changes} The update gap has widened from 159 days to 329 days, intensifying the risk of maintenance-mode stagnation. The competitive narrative now explicitly frames the lack of cloud-sync as a privacy-focused design choice rather than a feature omission. **Overall trend**: Mixed **Compared at**: 2026-10-28 ### High-impact changes - **[Added] Update gap severity** (swot) ### Medium-impact changes - **[Shifted] Pricing model positioning** (features) - **[Added] Sync engine threat** (swot) ## Rivals Landscape {#rivals} > Competitive positioning identified by AI analysis of app features, category, and market signals. ### Solid Calendar vs CalenGoo - Calendar and Tasks - **[CalenGoo - Calendar and Tasks](https://marlvel.ai/apps/com-calengoo-android)** by Gunia UG (haftungsbeschränkt): CalenGoo directly competes with Solid Calendar by offering a robust, feature-rich environment for power users who require deep integration between calendar events and task management. - **Key differences:** - Offers a sophisticated direct sync engine that provides more reliable cross-platform data consistency than Solid. - Includes advanced task-in-event integration, allowing users to manage complex workflows directly within their calendar view. - Provides specialized floating event functionality that offers greater flexibility for scheduling tasks without fixed time slots. ### Contenders (Strong Challengers) - **[Štyri Zmeny](https://marlvel.ai/apps/eu-efreet-styrizmeny)** by Miroslav Mydlo: This app serves the same niche of shift-based workers, focusing on group-oriented scheduling and calendar integration. - Supports working group synchronization, allowing teams to share and coordinate shift schedules seamlessly. - Provides a streamlined focus on shift schedule management that reduces complexity for non-office workers. - **[ShiftCal: Shift Schedule Maker](https://marlvel.ai/apps/shiftcal-shift-schedule-maker)** by nguyen thanh: ShiftCal overlaps with Solid Calendar by providing specialized scheduling tools for users with non-traditional work hours. - Includes automated pay calculation and time tracking features specifically designed for shift-based professional roles. - Offers multi-view scheduling layouts that allow users to visualize complex shift patterns more effectively. - **[Algerie Calendrier 2026](https://marlvel.ai/apps/com-agus-algerie-calendrier)** by Jatisari Inovasi Studio: This app competes by offering localized content and regional holiday integration for specific user demographics. - Provides deep regional holiday integration that offers immediate utility for users in specific geographic markets. - Focuses on high-level event customization and personalization tailored to local cultural and professional requirements. - **[Cat Calendar：Schedule Planner](https://marlvel.ai/apps/com-nicolecat-calendar)** by Nicole Cat: This app targets a similar productivity audience but differentiates through gamification and aesthetic customization. - Features a unique character skin system that gamifies the scheduling experience for more casual users. - Includes a built-in countdown timer, providing a visual urgency tool not present in Solid Calendar. ### Peers (What They Do Better) - **[FP Audit](https://marlvel.ai/apps/ru-fixprice-fpa-android)** by Fix Price: This app occupies the task-management side of the productivity spectrum, focusing on digital checklists and reporting. - Focuses on digital checklists and photo reporting, providing a structured way to manage field-based tasks. - Includes automated task generation, which streamlines the workflow for users managing recurring operational audits. - **[Time Doctor](https://marlvel.ai/apps/time-doctor)** by Mystaff.com LLC: Time Doctor addresses the productivity space through workforce analytics and time tracking rather than event scheduling. - Utilizes AI-driven benchmarks to provide deep workforce analytics and productivity insights for professional teams. - According to reviews, some users allege the app's monitoring features feel invasive and overly restrictive [1]. - **[Flip Clock: Alarm & Pomodoro](https://marlvel.ai/apps/flip-clock-alarm-pomodoro)** by 志杰 朱: This app competes for the user's focus by providing time-tracking and Pomodoro-style productivity tools. - Offers a highly aesthetic, customizable flip-clock interface that serves as a visual productivity desk accessory. - Includes a dedicated Pomodoro sync feature to help users manage deep work sessions through time-blocking. - **[SIGNL4 - Mobile Alerting](https://marlvel.ai/apps/signl4-mobile-alerting)** by Derdack GmbH: While more enterprise-focused, it competes for the same 'time management' real estate by handling on-call scheduling and alerts. - Features automated escalation policies that ensure critical alerts reach the right personnel during on-call shifts. - Integrates with third-party enterprise systems to provide a comprehensive mobile alerting and incident response platform. ### New Kids on the Block (What's Innovative) - **[Wishlist: Smart Wish Tracker](https://marlvel.ai/apps/wishlist-smart-wish-tracker)** by Noman.Sheikh: While focused on tracking, it competes for user attention within the broader personal organization and planning category. - Provides specialized price and quantity tracking for personal items, distinct from traditional event-based calendar management. - **[DayBlocks - Visualize Time](https://marlvel.ai/apps/com-davensix-dayblocks)** by ALAN D NAVARRO LOPEZ: A new entrant that uses time-blocking visualization to compete for the same productivity-focused user base. - Uses color-coded urgency indicators to help users visually prioritize their daily tasks and calendar blocks. ## App Momentum (Steady) {#momentum} - No major updates in 329 days. - Steady, low-velocity release cadence. > **Cadence:** 5 total versions · 0 majors in last 6 months · 159 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Solid Calendar is a productivity app that is a paid app. It holds a 4.89/5 rating from 114 reviews. > **Bottom Line:** Solid Calendar’s one-time purchase model effectively captures subscription-fatigued users, but the 329-day update gap leaves the app vulnerable to rivals with active development cycles. Prioritizing a feature update for the rotating schedule manager would defend the core shift-worker segment against more agile competitors. **Best for:** Professionals, students, and shift-workers seeking a simple, subscription-free alternative to native calendar applications. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] Ship a feature update to the rotating schedule manager because the current 329-day update gap risks user churn to more active rivals → increase retention. ### Feature Gaps vs Competitors - Advanced task-in-event integration (available in CalenGoo but absent here) ### Outlook: Mixed The productivity calendar market is consolidating around tools that offer either deep enterprise integration or high-frequency live-ops updates. Solid Calendar remains advantaged by its pricing, but the lack of recent development activity exposes it to churn as competitors improve their feature sets. - 🔴 The 329-day update gap suggests the app is in maintenance mode, which risks losing users to rivals with faster release cadences. - 🟢 The $4.99 one-time purchase model remains a strong differentiator in a market saturated with recurring subscription costs. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.89/5 | | Total Reviews | 114 | | Confidence | Low | | Pricing Model | Paid | | Platforms | iOS | | Key Features | 3 analyzed | | Trend | Mixed | | Outlook | Mixed | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Solid Calendar** (this app) | 4.89/5 | N/A | Solid Apps S.R.L. | | [FP Audit](https://marlvel.ai/apps/ru-fixprice-fpa-android) | 4.4/5 | N/A | Fix Price | | [CalenGoo - Calendar and Tasks](https://marlvel.ai/apps/com-calengoo-android) | 4.9/5 | Mixed | Gunia UG (haftungsbeschränkt) | | [Štyri Zmeny](https://marlvel.ai/apps/eu-efreet-styrizmeny) | 4.6/5 | N/A | Miroslav Mydlo | | [DayBlocks - Visualize Time](https://marlvel.ai/apps/com-davensix-dayblocks) | 5.0/5 | N/A | ALAN D NAVARRO LOPEZ | | [ShiftCal: Shift Schedule Maker](https://marlvel.ai/apps/shiftcal-shift-schedule-maker) | 5.0/5 | N/A | nguyen thanh | ## Company Profile - **Developer:** Solid Apps S.R.L. - **Website:** [https://solidapps.co](https://solidapps.co) ## Data Sources & Links - **App Store ID:** 6448245807 - **Dev Site:** [Official Website](https://solidapps.co) - **Sources:** Developer website content, App store metadata. ## Related Intel Reports - [*FP Audit*](https://marlvel.ai/apps/ru-fixprice-fpa-android) (Fix Price) · 4.4/5 Rating - [*CalenGoo - Calendar and Tasks*](https://marlvel.ai/apps/com-calengoo-android) (Gunia UG (haftungsbeschränkt)) · 4.9/5 Rating - [*Štyri Zmeny*](https://marlvel.ai/apps/eu-efreet-styrizmeny) (Miroslav Mydlo) · 4.6/5 Rating - [*DayBlocks - Visualize Time*](https://marlvel.ai/apps/com-davensix-dayblocks) (ALAN D NAVARRO LOPEZ) · 5.0/5 Rating - [*ShiftCal: Shift Schedule Maker*](https://marlvel.ai/apps/shiftcal-shift-schedule-maker) (nguyen thanh) · 5.0/5 Rating - [*Wishlist: Smart Wish Tracker*](https://marlvel.ai/apps/wishlist-smart-wish-tracker) (Noman.Sheikh) · N/A Rating - [*Time Doctor*](https://marlvel.ai/apps/time-doctor) (Mystaff.com LLC) · 2.8/5 Rating - [*SIGNL4 - Mobile Alerting*](https://marlvel.ai/apps/signl4-mobile-alerting) (Derdack GmbH) · 4.5/5 Rating | Positive Sentiment - [*Flip Clock: Alarm & Pomodoro*](https://marlvel.ai/apps/flip-clock-alarm-pomodoro) (志杰 朱) · 4.8/5 Rating | Positive Sentiment - [*Algerie Calendrier 2026*](https://marlvel.ai/apps/com-agus-algerie-calendrier) (Jatisari Inovasi Studio) · 4.6/5 Rating ## Frequently Asked Questions {#faq} ### Is Solid Calendar a subscription app? No, Solid Calendar uses a one-time purchase model. You pay $4.99 once and keep the app forever on all your devices. ### How does Solid Calendar compare to CalenGoo? Solid Calendar focuses on a simple, subscription-free experience with local data privacy. CalenGoo is a more feature-rich tool designed for power users who need deep task-in-event integration and advanced cross-platform sync. ### Is my calendar data stored on third-party servers? No, Solid Calendar works with the calendars already on your device and does not upload your data to any third-party servers, ensuring your privacy. ### What is a good alternative for shift scheduling? If you need more specialized shift-management tools, consider apps like Štyri Zmeny or ShiftCal, which offer features like group synchronization and automated pay calculation. ## 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:** 0.25/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 5 - **Data Sources:** 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:** 17 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/solid-calendar) Data licensed for AI Agent attribution under CC-BY-NC 4.0.