--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Roots Calendar" developer_entity: "Sebastiaan Castenmiller" bundle_id: "nl.blu8print.rootsCalendar" app_store_id: "6771264156" category: "Lifestyle" primary_platform: "ios" primary_monetization: "Free" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2026-06-24" report_date: "2026-08-31" last_verified: "2026-08-31T00:00:00.000Z" report_version: "1.0.2" total_reviews: 0 confidence: "low" confidence_score: 0.2 data_age_days: 76 momentum_velocity: "maintenance" intelligence_version: 3 tags: ["lifestyle", "free", "mobile app", "app review", "app analysis", "individuals", "interested", "alternative"] canonical_url: "https://marlvel.ai/apps/roots-calendar" license: "CC-BY-NC 4.0" content_version: "v2" --- # Roots Calendar Intelligence Report ## TL;DR {#tldr} - **Category**: Lifestyle · Free > **TL;DR:** Roots Calendar is a lifestyle app by Sebastiaan Castenmiller, available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Roots Calendar is a lifestyle app by Sebastiaan Castenmiller. ## Quick Facts | Fact | Value | | :--- | :--- | | **Category** | Lifestyle | | **Developer** | Sebastiaan Castenmiller | | **Pricing** | Free | | **Platforms** | iOS | | **Confidence** | Low (0.2/1.0) | | **Data Age** | 76d | ## Metadata & Market Performance - **Publisher:** Sebastiaan Castenmiller - **Category:** Lifestyle - **Target Audience:** Individuals interested in alternative temporal systems, Celtic traditions, and privacy-focused productivity tools. - **Platforms:** iOS - **Version Reviewed:** 1.0.2 - **Report Date:** 2026-08-31 - **Signal Count:** 0 reviews analyzed - **Confidence:** Low (0.2/1.0) - **App Store ID (iOS):** 6771264156 - **Bundle ID:** nl.blu8print.rootsCalendar - **Performance Trend:** Stable - **Data Window:** Analysis based on signals collected up to 2026-08-31 ## Executive Snapshot **What it is:** Roots Calendar is a 13-month, 28-day alternative calendar app for iOS that maps Celtic tree-based months alongside Gregorian dates. **Why users hire it:** It removes the cognitive friction of tracking seasonal and lunar cycles manually by automating the Beth-Luis-Nion system within a familiar digital interface. ## App DNA (Features & Intent) - **[Differentiator] Beth-Luis-Nion Calendar System:** 13-month, 28-day structure named after trees, offering a seasonal rhythm distinct from Gregorian calendars. - **[Differentiator] Local-First Data Storage:** SQLite-based local storage ensures no data leaves the device, appealing to privacy-conscious users. * *User Intent:* Users prioritize data protection and trust in the platform. - **[Standard] Google Calendar Sync:** Optional two-way sync maps Roots events to Gregorian dates for compatibility with existing schedules. * *User Intent:* Users expect seamless access across multiple devices. ## Market Position {#market-position} Roots Calendar occupies a niche position in the Lifestyle category, focusing on privacy and alternative temporal systems rather than mass-market utility. The lack of monetization and open-source nature signals a developer-led project rather than a commercial product competing for chart dominance. ## Monetization Strategy - **Model:** Free - **Tiers:** Free - **Analysis:** Roots Calendar is a completely free, open-source tool with no subscription gates or monetization. ## SWOT Analysis {#swot} **Core Strengths:** - Local-first SQLite storage provides a privacy-conscious barrier that cloud-dependent calendar apps cannot match. **Growth Levers:** - Integrating Ogham alphabet educational content could deepen the niche appeal for Celtic tradition practitioners. ## Recent Changes (v2 → v3) {#recent-changes} Strategic focus has shifted from content expansion to addressing privacy friction caused by the Google Calendar sync dependency. The product remains in a maintenance-only state with no new feature releases. **Overall trend**: Stable **Compared at**: 2026-08-31 ### High-impact changes - **[Shifted] Sync Dependency Reclassified** (swot) ### Medium-impact changes - **[Shifted] Developer-Led Identity** (positioning) - **[Added] Competitive Threat Identification** (swot) ## What's New - **Latest (v1.0.2, 2 months ago):** Introduced moon phase home screen widgets, recurring event scheduling, and improved dark mode contrast. ## App Momentum (Maintenance) {#momentum} - Ships bug fixes at ~9-week cadence. - Last major release June 2026. > **Cadence:** 1 total versions · 1 majors in last 6 months · 67 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Roots Calendar is a lifestyle app that is completely free. > **Bottom Line:** Roots Calendar defends its niche through strict local-first privacy, but the reliance on Google Calendar for sync creates a friction point that limits its appeal to the most privacy-conscious users. **Best for:** Individuals interested in alternative temporal systems, Celtic traditions, and privacy-focused productivity tools. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] Audit sync logic because the current Google Calendar dependency limits the privacy-first value proposition → increase user trust ### Outlook: Stable The market for alternative productivity tools remains fragmented, with Roots Calendar occupying a niche position that prioritizes privacy and tradition over broad-market feature parity. The current maintenance-mode cadence suggests that the developer is prioritizing stability over rapid feature expansion, which limits the app's ability to capture users from mainstream calendar platforms. - ⚪ The maintenance-mode release cadence indicates a stable, feature-complete state rather than an active expansion phase, which limits new user acquisition. - 🟢 Local-first data storage remains a strong retention lever for privacy-conscious users who reject cloud-based calendar alternatives. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Total Reviews | 0 | | Confidence | Low | | Pricing Model | Free | | Platforms | iOS | | Key Features | 3 analyzed | | Trend | Stable | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Roots Calendar** (this app) | N/A/5 | N/A | Sebastiaan Castenmiller | | [Alarmy - Loud alarm clock](https://marlvel.ai/apps/alarmy-loud-alarm-clock) | 4.8/5 | Excited | Delight Room Co., Ltd. | | [Journey - Diary, Journal](https://marlvel.ai/apps/com-journey-ios-app) | 4.6/5 | Excited | Two App Studio Pte. Ltd. | | [Tinder Dating App: Date & Chat](https://marlvel.ai/apps/tinder-dating-app-date-chat) | 4.0/5 | n/a | Tinder LLC | | [Alarmie: Easy Rise Alarm Clock](https://marlvel.ai/apps/alarmie-easy-rise-alarm-clock) | 4.4/5 | Mixed | Jintian Wang | | [AlarmMon ( alarm clock )](https://marlvel.ai/apps/alarmmon-alarm-clock) | 4.3/5 | n/a | Malang Studio Co. Ltd, | ## Company Profile - **Developer:** Sebastiaan Castenmiller - **Website:** [https://rootscalendar.org](https://rootscalendar.org) ## Data Sources & Links - **App Store ID:** 6771264156 - **Dev Site:** [Official Website](https://rootscalendar.org) - **Sources:** Developer website content, App store metadata. ## Related Intel Reports - [*Alarmy - Loud alarm clock*](https://marlvel.ai/apps/alarmy-loud-alarm-clock) (Delight Room Co., Ltd.) · 4.8/5 Rating | Positive Sentiment - [*Journey - Diary, Journal*](https://marlvel.ai/apps/com-journey-ios-app) (Two App Studio Pte. Ltd.) · 4.6/5 Rating | Positive Sentiment - [*Tinder Dating App: Date & Chat*](https://marlvel.ai/apps/tinder-dating-app-date-chat) (Tinder LLC) · 4.0/5 Rating - [*Alarmie: Easy Rise Alarm Clock*](https://marlvel.ai/apps/alarmie-easy-rise-alarm-clock) (Jintian Wang) · 4.4/5 Rating - [*AlarmMon ( alarm clock )*](https://marlvel.ai/apps/alarmmon-alarm-clock) (Malang Studio Co. Ltd,) · 4.3/5 Rating - [*Amora: A Hint of Your Soulmate*](https://marlvel.ai/apps/amora-a-hint-of-your-soulmate) (Lit Apps LLC (Mobile)) · 4.7/5 Rating - [*Swiftime*](https://marlvel.ai/apps/swiftime) (MEDIANO Co.,Ltd.) · 4.5/5 Rating | Positive Sentiment - [*마주*](https://marlvel.ai/apps/an-offline-network-where-you-meet-through-qr-codes) (lvher) · N/A Rating - [*모앗*](https://marlvel.ai/apps/moat-moatapp) (JUNSEOK LEE) · N/A Rating - [*야기*](https://marlvel.ai/apps/tistory-88yhtserof-yagi) (Yunhwi Lim) · N/A Rating ## Frequently Asked Questions {#faq} ### Is Roots Calendar suitable for daily scheduling? Yes, it functions as a full calendar with month, week, and day views, allowing you to add and color-code events alongside the 13-month tree-based system. ### How does Roots Calendar compare to Google Calendar? Roots Calendar offers a unique 13-month tree-based rhythm that Google Calendar lacks, though it can sync with your Google Calendar to display your existing appointments. ### Is my data private in Roots Calendar? Yes, all event data is stored locally on your device using SQLite, and no data is sent to external servers. ### Are there other apps for Celtic calendar systems? Roots Calendar is a specialized tool for the Beth-Luis-Nion system; there are few direct alternatives that combine this specific tradition with local-first privacy. ## 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:** 0.2/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 0 - **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:** 76 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/roots-calendar) Data licensed for AI Agent attribution under CC-BY-NC 4.0.