--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Depth of Field Calc" developer_entity: "彤 刘" bundle_id: "com.liujie.dofcalc" app_store_id: "6777961146" category: "Utilities" primary_platform: "ios" primary_monetization: "Freemium" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2026-06-11" report_date: "2026-09-25" last_verified: "2026-09-25T00:00:00.000Z" report_version: "1.0" total_reviews: 0 confidence: "low" confidence_score: 0.05 data_age_days: 6 momentum_velocity: "maintenance" intelligence_version: 2 tags: ["utilities", "freemium", "mobile app", "app review", "app analysis", "photographers", "photography", "students"] canonical_url: "https://marlvel.ai/apps/depth-of-field-calc" license: "CC-BY-NC 4.0" content_version: "v2" --- # Depth of Field Calc Intelligence Report ## TL;DR {#tldr} - **Category**: Utilities · Freemium > **TL;DR:** Depth of Field Calc is a utilities app by 彤 刘, available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Depth of Field Calc is a utilities app by 彤 刘. ## Quick Facts | Fact | Value | | :--- | :--- | | **Category** | Utilities | | **Developer** | 彤 刘 | | **Pricing** | Freemium | | **Platforms** | iOS | | **Confidence** | Low (0.05/1.0) | | **Data Age** | 6d | ## Metadata & Market Performance - **Publisher:** 彤 刘 - **Category:** Utilities - **Target Audience:** Photographers and photography students requiring precise technical calculations for depth of field, hyperfocal distance, and focus stacking. - **Platforms:** iOS - **Version Reviewed:** 1.0 - **Report Date:** 2026-09-25 - **Signal Count:** 0 reviews analyzed - **Confidence:** Low (0.05/1.0) - **App Store ID (iOS):** 6777961146 - **Bundle ID:** com.liujie.dofcalc - **Data Window:** Analysis based on signals collected up to 2026-09-25 ## Executive Snapshot **What it is:** Depth of Field Calc is a technical photography utility for iOS that calculates depth-of-field and hyperfocal distances using a visual lens-barrel interface. **Why users hire it:** Photographers use the app to replace mental math and generic calculators with a precise, visual reference that maps directly to manual lens operation. ## App DNA (Features & Intent) - **[Differentiator] Live Clarity Band:** Visualizes depth-of-field scale in real time as a green zone on a simulated lens barrel. - **[Differentiator] Focus-stacking Planner:** Calculates frame count and per-frame focus distance for macro photography with 20% overlap. - **[Differentiator] Diffraction Warning:** Traffic light indicator based on the selected camera body's pixel pitch. ## Market Position {#market-position} Depth of Field Calc operates as a specialized technical utility, positioning itself through professional-grade visual feedback rather than broad-market reach. The lack of recent updates (106 days since last release) suggests a stable, maintenance-focused posture rather than an aggressive growth strategy. ## Monetization Strategy - **Model:** Freemium - **Tiers:** Free tier: Core calculator and basic sensor data, Pro tier: $3.99 one-time unlock for advanced planning tools and unlimited presets - **Analysis:** The freemium model uses a one-time purchase to gate advanced technical planning tools while keeping core utility free to maximize the user base. ## SWOT Analysis {#swot} **Core Strengths:** - Live clarity band visualization creates a defensible differentiation against standard text-based calculators - Strict millimeter unit discipline ensures professional-grade accuracy for technical photography **Growth Levers:** - Educational partnerships with photography schools could leverage the app's built-in plain-language explainers ## App Momentum (Maintenance) {#momentum} - Ships no updates in 3 months - Maintains stable, maintenance-mode release cadence > **Cadence:** 1 total versions · 0 majors in last 6 months · 105 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Depth of Field Calc is an utilities app that is free with in-app purchases. > **Bottom Line:** Depth of Field Calc secures a niche by prioritizing visual feedback over raw data, but the current maintenance-mode cadence risks stagnation. A minor feature update would defend the tool's relevance against more active technical utilities. **Best for:** Photographers and photography students requiring precise technical calculations for depth of field, hyperfocal distance, and focus stacking. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] Ship a minor feature update because the app has been in maintenance mode for over three months → defend against active rivals ### Outlook: Mixed The technical utility market is consolidating around tools that offer both precision and frequent live-ops updates. Depth of Field Calc remains advantaged by its visual interface, but the lack of recent development activity leaves the app exposed to rivals that maintain a more active release schedule. - 🔴 The 106-day gap since the last update signals a transition to maintenance mode, which reduces the app's visibility in competitive search results. - 🟢 The high-utility free tier provides a strong foundation for organic discovery, which could support future growth if the development cadence resumes. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Total Reviews | 0 | | Confidence | Low | | Pricing Model | Freemium | | Platforms | iOS | | Key Features | 3 analyzed | | Outlook | Mixed | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Depth of Field Calc** (this app) | N/A/5 | N/A | 彤 刘 | | [Sota Connect: Secure Network](https://marlvel.ai/apps/fi-catconnect-sota) | 4.9/5 | N/A | Cat Connect | | [V2Box - V2ray Client](https://marlvel.ai/apps/v2box-v2ray-client) | 4.6/5 | n/a | techlaim | | [avoVPN Desktop](https://marlvel.ai/apps/avovpn-desktop) | N/A/5 | N/A | Avocado VPN Technologies | | [Fusvob VPN : Super VPN 2026](https://marlvel.ai/apps/com-toplinkc-foxexcellent) | 4.5/5 | Mixed | Fuxin Technology | | [Gear Ratio Calculator & RPM](https://marlvel.ai/apps/cog-gear-ratio-calculator) | N/A/5 | N/A | Linh Phan Nhat Khanh | ## Company Profile - **Developer:** 彤 刘 ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/depth-of-field-calc/id6777961146?uo=4) - **Sources:** App store metadata. ## Related Intel Reports - [*Sota Connect: Secure Network*](https://marlvel.ai/apps/fi-catconnect-sota) (Cat Connect) · 4.9/5 Rating - [*V2Box - V2ray Client*](https://marlvel.ai/apps/v2box-v2ray-client) (techlaim) · 4.6/5 Rating - [*avoVPN Desktop*](https://marlvel.ai/apps/avovpn-desktop) (Avocado VPN Technologies) · N/A Rating - [*Fusvob VPN : Super VPN 2026*](https://marlvel.ai/apps/com-toplinkc-foxexcellent) (Fuxin Technology) · 4.5/5 Rating - [*Gear Ratio Calculator & RPM*](https://marlvel.ai/apps/cog-gear-ratio-calculator) (Linh Phan Nhat Khanh) · N/A Rating - [*NordVPN: VPN Fast & Secure*](https://marlvel.ai/apps/com-nordvpn-nordvpn) (Nordvpn S.A.) · 4.7/5 Rating - [*Pulley Calculator Easy*](https://marlvel.ai/apps/pulley-calculator-easy) (YAVUZ BULAMADIK) · N/A Rating - [*Track And Field Companion*](https://marlvel.ai/apps/track-and-field-companion) (Travis Menghini) · N/A Rating - [*VPN 365-Master WIFI Security*](https://marlvel.ai/apps/vpn-365-master-wifi-security) (vpn fast) · 4.6/5 Rating - [*VPN - Seal VPN Secure Proxy*](https://marlvel.ai/apps/vpn-seal-vpn-secure-proxy) (Starpass VPN Free) · 4.6/5 Rating | Positive Sentiment ## Frequently Asked Questions {#faq} ### Is Depth of Field Calc suitable for beginners? Yes, the app includes built-in plain-language explainers for concepts like circle of confusion and diffraction, making it useful for students as well as professionals. ### Does Depth of Field Calc require a subscription? No, the app uses a one-time purchase model. The core calculator is free, while advanced tools like the focus-stacking planner require a single $3.99 unlock. ### What makes Depth of Field Calc different from other calculators? Unlike calculators that only display numbers, Depth of Field Calc features a live clarity band that visualizes depth-of-field scales in real time, similar to a physical lens barrel. ## 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:** 0.05/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 0 - **Data Sources:** 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:** 6 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/depth-of-field-calc) Data licensed for AI Agent attribution under CC-BY-NC 4.0.