--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Swelter: Heat Stress Index" developer_entity: "RBRN Labs LLC" bundle_id: "com.rbrn-labs-llc.Swelter" app_store_id: "6794481096" category: "Weather" primary_platform: "ios" primary_monetization: "Freemium" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2026-08-14" report_date: "2026-08-14" last_verified: "2026-08-14T00:00:00.000Z" report_version: "1.2.2" total_reviews: 1 overall_rating: 5 confidence: "low" confidence_score: 0.2 data_age_days: 55 momentum_velocity: "active" intelligence_version: 3 tags: ["weather", "freemium", "mobile app", "app review", "app analysis", "outdoor", "athletes,", "coaches,"] canonical_url: "https://marlvel.ai/apps/swelter-heat-safety-wbgt" license: "CC-BY-NC 4.0" content_version: "v2" --- # Swelter: Heat Stress Index Intelligence Report ## TL;DR {#tldr} - **Category**: Weather · Freemium - **Signal**: Rating 5 > **TL;DR:** Swelter: Heat Stress Index is a weather app by RBRN Labs LLC, rated 5/5 by 1 users, available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Swelter: Heat Stress Index is a weather app by RBRN Labs LLC. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 5/5 (1 review) | | **Category** | Weather | | **Developer** | RBRN Labs LLC | | **Pricing** | Freemium | | **Platforms** | iOS | | **Confidence** | Low (0.2/1.0) | | **Data Age** | 55d | ## Metadata & Market Performance - **Publisher:** RBRN Labs LLC - **Category:** Weather - **Target Audience:** Outdoor athletes, coaches, and workers who need to manage heat stress risks during physical activity. - **Platforms:** iOS - **Version Reviewed:** 1.2.2 - **Report Date:** 2026-08-14 - **Signal Count:** 0 reviews analyzed - **Confidence:** Low (0.2/1.0) - **App Store ID (iOS):** 6794481096 - **Bundle ID:** com.rbrn-labs-llc.Swelter - **Performance Trend:** Improving - **Data Window:** Analysis based on signals collected up to 2026-08-14 ## Executive Snapshot **What it is:** Swelter is a specialized weather app for iOS that calculates WBGT heat stress indices to guide outdoor activity safety. **Why users hire it:** It removes the cognitive friction of interpreting raw weather data (humidity, sun, wind) into actionable safety decisions for outdoor athletes. ## App DNA (Features & Intent) - **[Differentiator] WBGT Calculation Engine:** Computes heat stress using local temperature, humidity, wind, and solar geometry. - **[Differentiator] Best Window Planning:** Identifies least-risky time blocks for outdoor activity. - **[Standard] Severe Weather Alerts:** Sends push notifications for extreme heat and storm events. * *User Intent:* Users want timely prompts to stay engaged without missing updates. ## Market Position {#market-position} Swelter occupies a niche in the Weather category by focusing on WBGT-based safety rather than general forecasting. The current 5-star rating on the initial release indicates high early-adopter satisfaction, though the single-rating count necessitates a broader user base to validate long-term retention. ## Monetization Strategy - **Model:** Freemium - **Tiers:** Free: current flag, gauge, timeline, severe alerts, Pro: full week charts, hourly UV, extra alerts, saved locations - **Analysis:** Freemium model gates advanced planning and historical data behind a Pro subscription, while keeping core safety indicators free to maximize user base. ## SWOT Analysis {#swot} **Core Strengths:** - WBGT-specific algorithm validated against 14,099 station-hours provides a defensible accuracy barrier - Four-flag safety system simplifies complex environmental data into actionable activity decisions **Growth Levers:** - Localized safety-compliance tools for workplace heat-stress regulations could unlock B2B distribution channels ## Recent Changes (v2 → v3) {#recent-changes} Swelter has expanded its market positioning from an athletic-focused tool to an industrial safety utility, while simultaneously adjusting its conversion strategy to trial-based access for core features. **Overall trend**: Improving **Compared at**: 2026-08-14 ### High-impact changes - **[Shifted] Industrial Market Expansion** (audience) - **[Shifted] Trial-Based Conversion** (pricing) ### Medium-impact changes - **[Improved] Standardized Safety Framework** (positioning) - **[Added] B2B Opportunity Identification** (swot) ## What's New - **Latest (v1.2.2, today):** Refined Settings UI and fixed widget synchronization issues for extreme weather conditions. ## App Momentum (Active) {#momentum} - Ships frequent updates for widget synchronization. - Refined Settings UI in latest release. > **Cadence:** 2 total versions · 0 majors in last 6 months · 0 days since last update · 3 days avg between updates ## The "So What?" (Strategic Takeaway) {#so-what} Swelter: Heat Stress Index is a weather app that is free with in-app purchases. It holds a 5/5 rating from 1 review. > **Bottom Line:** Swelter's validated WBGT engine provides a clear safety advantage over standard weather apps, but the current Pro-tier gating of planning tools limits the funnel for casual users who need the Best Window feature to justify a subscription. **Best for:** Outdoor athletes, coaches, and workers who need to manage heat stress risks during physical activity. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] Ship a Workplace Safety mode because the current ACSM-focused messaging misses the industrial compliance segment → expand total addressable market. ### Outlook: Improving The heat-safety market is consolidating around specialized indices, and Swelter's focus on WBGT accuracy positions it well against generalist weather apps. Continued investment in the algorithm and widget accessibility will be necessary to maintain this lead as native weather apps add more granular health metrics. - 🟢 Frequent update cadence (two releases in three days) indicates active development and rapid response to widget synchronization issues. - ⚪ The current reliance on a single-rating base means the app has yet to face the churn pressure of a mass-market user cohort. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 5/5 | | Total Reviews | 1 | | Confidence | Low | | Pricing Model | Freemium | | Platforms | iOS | | Key Features | 3 analyzed | | Trend | Improving | | Outlook | Improving | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Swelter: Heat Stress Index** (this app) | 5/5 | N/A | RBRN Labs LLC | | [Bauernkalender](https://marlvel.ai/apps/ch-swift-bauernkalender) | N/A/5 | N/A | Swift Management AG | | [Forecast & What to Wear](https://marlvel.ai/apps/com-appsforparents-weatherforkids) | 4.2/5 | N/A | Natalia Jakubczyk-Gajewska | | [Weather&Clothes](https://marlvel.ai/apps/com-air-weather_and_clothes) | 2.7/5 | N/A | fk.system | | [처음날씨 - 잠금화면 및 알람으로 오늘의 날씨를!](https://marlvel.ai/apps/com-woozuda-weather) | 4.2/5 | N/A | WOOZUDA | | [미세미세 - 미세먼지, 초미세먼지, 날씨](https://marlvel.ai/apps/cheehoon-ha-particulateforecaster-particulateforecaster) | 4.8/5 | Excited | LifeOverflow Inc. | ## Company Profile - **Developer:** RBRN Labs LLC - **Website:** [https://rbrn-labs.com](https://rbrn-labs.com) ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/swelter-heat-safety-wbgt/id6794481096?uo=4) - **Dev Site:** [Official Website](https://rbrn-labs.com) - **Sources:** Developer website content, App store metadata. ## Related Intel Reports - [*Bauernkalender*](https://marlvel.ai/apps/ch-swift-bauernkalender) (Swift Management AG) · N/A Rating - [*Forecast & What to Wear*](https://marlvel.ai/apps/com-appsforparents-weatherforkids) (Natalia Jakubczyk-Gajewska) · 4.2/5 Rating - [*Weather&Clothes*](https://marlvel.ai/apps/com-air-weather_and_clothes) (fk.system) · 2.7/5 Rating - [*처음날씨 - 잠금화면 및 알람으로 오늘의 날씨를!*](https://marlvel.ai/apps/com-woozuda-weather) (WOOZUDA) · 4.2/5 Rating - [*미세미세 - 미세먼지, 초미세먼지, 날씨*](https://marlvel.ai/apps/cheehoon-ha-particulateforecaster-particulateforecaster) (LifeOverflow Inc.) · 4.8/5 Rating | Positive Sentiment - [*너의날씨: 미세먼지, 지도, 레이더, 캐릭터, 위젯*](https://marlvel.ai/apps/kr-guzi-yourweather) (구지랩(GuziLab)) · 5.0/5 Rating - [*ชายฝั่ง รู้ทันระดับน้ำ*](https://marlvel.ai/apps/hii-pttep-chaifang-mobile) (Hydro Informatics Institute) · 4.9/5 Rating - [*ภัยพิบัติไทย*](https://marlvel.ai/apps/biz-harmoniz-earthquake_alert_thai) (Harmoniz InterSoftware) · N/A Rating - [*13abc First Alert Weather*](https://marlvel.ai/apps/com-gray-wtvg-13abc-weather) (Gray Television Group, Inc.) · 4.6/5 Rating - [*13WarnMe*](https://marlvel.ai/apps/13warnme) (Local TV LLC) · 3.0/5 Rating ## Frequently Asked Questions {#faq} ### Is Swelter accurate for my location? Swelter is validated against 14,099 measured WBGT station-hours, with 99.95% of readings falling within one flag level of the measured standard. ### Does Swelter work without a subscription? Yes, the core safety features including the current flag, gauge, timeline, and severe-heat alerts are free for all users. ### How is Swelter different from a standard weather app? Standard apps use heat index, which often ignores wind and direct sun. Swelter uses WBGT, the global standard for heat stress, which accounts for solar geometry and wind speed. ## 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:** 55 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/swelter-heat-safety-wbgt) Data licensed for AI Agent attribution under CC-BY-NC 4.0.