--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "HazeLog - Coffee Roast Curves" developer_entity: "YANGLI CHEN" bundle_id: "com.chen.hazelog" app_store_id: "6791478115" category: "Food & Drink" primary_platform: "ios" primary_monetization: "Freemium" offline_capable: true market_region: "US" platforms: "iOS" app_last_updated: "2026-09-17" report_date: "2026-10-10" last_verified: "2026-10-10T00:00:00.000Z" report_version: "1.2" total_reviews: 0 confidence: "low" confidence_score: 0.2 data_age_days: 19 momentum_velocity: "steady" intelligence_version: 2 tags: ["food & drink", "freemium", "mobile app", "app review", "app analysis", "coffee", "roasters", "using"] canonical_url: "https://marlvel.ai/apps/hazelog-coffee-roast-curves" license: "CC-BY-NC 4.0" content_version: "v2" --- # HazeLog - Coffee Roast Curves Intelligence Report ## TL;DR {#tldr} - **Category**: Food & Drink · Freemium > **TL;DR:** HazeLog - Coffee Roast Curves is a food & drink app by YANGLI CHEN, available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** HazeLog - Coffee Roast Curves is a food & drink app by YANGLI CHEN. ## Quick Facts | Fact | Value | | :--- | :--- | | **Category** | Food & Drink | | **Developer** | YANGLI CHEN | | **Pricing** | Freemium | | **Platforms** | iOS | | **Confidence** | Low (0.2/1.0) | | **Data Age** | 19d | ## Metadata & Market Performance - **Publisher:** YANGLI CHEN - **Category:** Food & Drink - **Target Audience:** Home coffee roasters using stovetop pans, hand-nets, or small-scale roasters who prioritize manual control and data logging. - **Platforms:** iOS - **Version Reviewed:** 1.2 - **Report Date:** 2026-10-10 - **Signal Count:** 0 reviews analyzed - **Confidence:** Low (0.2/1.0) - **App Store ID (iOS):** 6791478115 - **Bundle ID:** com.chen.hazelog - **Data Window:** Analysis based on signals collected up to 2026-10-10 ## Executive Snapshot **What it is:** HazeLog is a roast-curve logbook for home coffee roasters, enabling manual event tracking and profile replication on iOS. **Why users hire it:** The app removes the need for expensive temperature probes by allowing users to log roast events manually and compare them against past sessions, serving the need for consistent results in manual roasting. ## App DNA (Features & Intent) - **[Differentiator] Ghost Curve:** Overlays a past roast profile onto the live screen to guide temperature and timing adjustments during the roasting process * *User Intent:* Users need clear guidance to understand and adopt the product quickly. - **[Standard] Live Roast Logging:** Records charge, temperature, first crack, second crack, and drop events via large, tap-to-undo buttons designed for one-handed use - **[Differentiator] Offline Data Storage:** Stores all roast logs, photos, and environment data locally on the device without requiring account registration or cloud connectivity * *User Intent:* Users want uninterrupted access without internet dependency. ## Market Position {#market-position} HazeLog operates in the niche Food & Drink sub-segment for coffee enthusiasts, differentiating itself from hardware-dependent logging apps through a one-time purchase model. Its offline-first architecture serves as a primary barrier against churn for users who prioritize privacy and data ownership. ## Monetization Strategy - **Model:** Freemium - **Tiers:** Free tier includes unlimited logging, backup, and basic bean management, Pro tier at one-time purchase of $1,000 JPY unlocks ghost curves, analysis, and export - **Analysis:** Monetization relies on a one-time purchase model rather than subscriptions, gating advanced analytical and export features. ## SWOT Analysis {#swot} **Core Strengths:** - Offline-first architecture removes server-dependency churn risk - One-time purchase model appeals to users avoiding subscription fatigue - Ghost-curve overlay enables precise roast reproduction without hardware probes **Growth Levers:** - Expansion into educational content regarding roast-curve theory could drive Pro-tier conversion - Integration with green-bean supplier databases could simplify inventory management ## What's New - **Latest (v1.2, 3 weeks ago):** Introduced per-bean trend analytics, monthly roast grouping, and haptic event notifications. Improved session recovery, external purchase syncing, and accessibility support. ## App Momentum (Steady) {#momentum} - Shipped per-bean trend analytics. - Added haptic event notifications. - Ships ~1 major release per month. > **Cadence:** 2 total versions · 1 majors in last 6 months · 22 days since last update · 34 days avg between updates ## The "So What?" (Strategic Takeaway) {#so-what} HazeLog - Coffee Roast Curves is a food & drink app that is free with in-app purchases. > **Bottom Line:** HazeLog maintains a strong position by serving the manual-roasting niche with a privacy-focused, one-time purchase model. Prioritizing educational content within the Pro tier would unlock higher conversion rates by helping users interpret their roast data more effectively. **Best for:** Home coffee roasters using stovetop pans, hand-nets, or small-scale roasters who prioritize manual control and data logging. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] Ship a Roast Theory guide in the Pro tier because users lack educational context for curve interpretation → increase Pro-tier conversion ### Outlook: Stable Users report: The home-roasting market is increasingly segmenting between hardware-integrated automation and manual-logging enthusiasts. HazeLog is well-positioned to capture the latter by focusing on privacy and one-time pricing, which insulates it from the subscription fatigue currently affecting broader productivity and hobbyist categories. - 🟢 Steady release cadence (two updates in 22 days) demonstrates active maintenance and feature expansion rather than abandonment. - ⚪ The one-time purchase model provides a stable, predictable revenue stream that avoids the churn risks associated with subscription-based coffee tools. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Total Reviews | 0 | | Confidence | Low | | Pricing Model | Freemium | | Platforms | iOS | | Key Features | 3 analyzed | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **HazeLog - Coffee Roast Curves** (this app) | N/A/5 | N/A | YANGLI CHEN | | [소박한 한 그릇](https://marlvel.ai/apps/app--426) | N/A/5 | N/A | DaolSoft, Co., Ltd. | | [알토란 레시피 - 요리 반찬 레시피](https://marlvel.ai/apps/woodisw-com-altrecipe) | N/A/5 | N/A | WoodiSW | | [メニュー](https://marlvel.ai/apps/app--677) | N/A/5 | N/A | Satoshi Sato | | [캐시모어](https://marlvel.ai/apps/com-bridgeworks-ios-cashmore) | 4.6/5 | N/A | bridgeworks | | [푸드트래블-푸블페이](https://marlvel.ai/apps/com-membership-foodtravel) | 1.3/5 | N/A | Flexday | ## Company Profile - **Developer:** YANGLI CHEN - **Website:** [https://freetokyolabs.com/hazelog/](https://freetokyolabs.com/hazelog/) ## Data Sources & Links - **App Store ID:** 6791478115 - **Dev Site:** [Official Website](https://freetokyolabs.com/hazelog/) - **Sources:** Developer website content, App store metadata. ## Related Intel Reports - [*소박한 한 그릇*](https://marlvel.ai/apps/app--426) (DaolSoft, Co., Ltd.) · N/A Rating - [*알토란 레시피 - 요리 반찬 레시피*](https://marlvel.ai/apps/woodisw-com-altrecipe) (WoodiSW) · N/A Rating - [*メニュー*](https://marlvel.ai/apps/app--677) (Satoshi Sato) · N/A Rating - [*캐시모어*](https://marlvel.ai/apps/com-bridgeworks-ios-cashmore) (bridgeworks) · 4.6/5 Rating - [*푸드트래블-푸블페이*](https://marlvel.ai/apps/com-membership-foodtravel) (Flexday) · 1.3/5 Rating - [*マイ・レシピ*](https://marlvel.ai/apps/app--689) (Satoshi Sato) · N/A Rating - [*ジョイフルアプリ*](https://marlvel.ai/apps/jp-co-unerry-bbcouponappjoyfull) (UNERRY,INC.) · 3.5/5 Rating - [*フレスタネットスーパーアプリ*](https://marlvel.ai/apps/jp-stailer-fresta) (10X, Inc.) · 4.3/5 Rating - [*100 Lebanese Recipes*](https://marlvel.ai/apps/com-lebguide-100lebaneserecipes) (LebGuide.com) · 4.7/5 Rating - [*100 лучших рецептов Mom Story*](https://marlvel.ai/apps/com-momstory) (Viktoriia Urmach) · 4.9/5 Rating ## Frequently Asked Questions {#faq} ### Is HazeLog suitable for beginners? HazeLog is designed for home roasters using stovetop pans or hand-nets. While it provides powerful logging tools, beginners may need to learn roast-curve theory to fully utilize the ghost curve and analysis features. ### Does HazeLog require a subscription? No, HazeLog uses a one-time Pro purchase model to unlock advanced features like ghost curves, batch comparison, and export, rather than recurring subscriptions. ### Can I use HazeLog without an internet connection? Yes, HazeLog is an offline-first application. All roast logs, photos, and environment data are stored locally on your device, ensuring your data remains private and accessible without cloud connectivity. ### What are the alternatives to HazeLog for roast logging? Alternatives include apps that support Bluetooth-connected temperature probes for automated logging. HazeLog is an alternative for those who prefer manual control and want to avoid the cost of hardware-integrated systems. ## 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:** 19 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/hazelog-coffee-roast-curves) Data licensed for AI Agent attribution under CC-BY-NC 4.0.