## ⚠ Content Warning This report covers topics classified as sensitive (health). Information is aggregated from public sources for informational purposes only. This is not medical advice. Consult a qualified professional before acting on any information here. --- last_verified: "2026-05-20T01:35:07.778Z" --- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Perfect OB Wheel" developer_entity: "Evan Schoenberg" bundle_id: "com.regularrateandrhythm.PerfectOBWheel" app_store_id: "293656711" google_play_id: "com.drahba.obwheel" category: "Medical" primary_platform: "ios" primary_monetization: "Freemium" offline_capable: false market_region: "US" platforms: "iOS & Android" app_last_updated: "2025-08-15" report_date: "2026-05-20" last_verified: "2026-05-20" report_version: "58" total_reviews: 3538 overall_rating: 4.92 sentiment: "Excited" sentiment_score: 85 confidence: "high" confidence_score: 0.55 top_praise_theme: "Clinical utility of the calculation modules provides reliable support for busy prenatal care providers" top_complaint_theme: "Inconsistent trimester dating logic contradicts standard medical guidelines used by major professional organizations" top_request_theme: "Customizable cycle length settings are required to accommodate patients with non-standard menstrual patterns" review_sample_size: 61 total_review_count: 61 analyzed_review_count: 61 data_age_days: 0 momentum_velocity: "zombie" intelligence_version: 3 nemesis: "Pregnancy + | Tracker App" competitor_count: 7 tags: ["medical", "freemium", "excited sentiment", "mobile app", "app review", "app analysis", "healthcare", "providers", "obstetricians"] canonical_url: "https://marlvel.ai/intel-report/medical/com-regularrateandrhythm-perfectobwheel" license: "CC-BY-NC 4.0" content_version: "v2" --- # Perfect OB Wheel App Audit ## TL;DR {#tldr} - **Category**: Medical · Freemium - **Signal**: Rating 4.92 · Sentiment Excited - **Recent focus**: Inconsistent trimester dating logic contradicts standard medical guidelines used by major professional organizations (top complaint) · Clinical utility of the calculation modules provides reliable support for busy prenatal care providers (top praise) · Customizable cycle length settings are required to accommodate patients with non-standard menstrual patterns (top request) > **TL;DR:** Perfect OB Wheel is a medical app by Evan Schoenberg, rated 4.92/5 by 3.5K users, with Excited user sentiment (85/100), available on iOS & Android. > > **Marlvel.ai App Intelligence** — Independent analysis. US Market. No publisher influence. > **Key Insight:** Perfect OB Wheel maintains Excited user sentiment (4.92/5 from 3.5K reviews), with users consistently praising clinical utility of the calculation modules provides reliable support for busy prenatal care providers. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.92/5 (3.5K reviews) | | **User Mood** | Excited | | **Category** | Medical | | **Developer** | Evan Schoenberg | | **Pricing** | Freemium | | **Platforms** | iOS & Android | | **Confidence** | High (0.55/1.0) | | **Data Age** | 0d | ## Metadata & Market Performance - **Publisher:** Evan Schoenberg - **Category:** Medical - **Target Audience:** Healthcare providers and obstetricians requiring precise, multi-method gestational dating tools, as well as patients seeking clinical-grade pregnancy tracking. - **Platforms:** iOS & Android - **Version Audited:** 58 - **Audit Date:** 2026-05-20 - **Signal Count:** 61 reviews analyzed - **Confidence:** High (0.55/1.0) - **App Store ID (iOS):** 293656711 - **Bundle ID:** com.regularrateandrhythm.PerfectOBWheel - **Google Play ID:** com.drahba.obwheel - **Performance Trend:** Mixed - **Data Window:** Analysis based on signals collected up to 2026-05-20 - **Short Description:** Fast gestational age & due date calculator with helpful toolkit ## Executive Snapshot **What it is:** Perfect OB Wheel is a clinical-grade gestational age and due date calculator for healthcare providers and patients on iOS and Android. **Why users hire it:** Users hire the app to replace inaccurate paper wheels with a rapid, multi-method digital tool that functions offline, saving time during high-pressure clinical shifts. ## App DNA (Features & Intent) - **[Differentiator] Multi-Method Gestational Calculation:** Computes gestational age and due date using LMP, USG, CRL, IVF, HC, and SFH inputs - **[Differentiator] Discrepancy Calculation:** Quantifies variance between LMP-based and ultrasound-based gestational age estimates - **[Differentiator] Patient Tracking and Notes:** Stores pregnancy data, notes, and images for multiple patients with passcode protection * *User Intent:* Users seek enhanced value through premium features. ## Market Position {#market-position} Perfect OB Wheel holds the #40 Paid position in the US Medical category, maintaining a 4.9-star rating across 3,538 reviews. The $1.99 price point targets professional users who value utility over the ad-supported content feeds of larger competitors. ## Monetization Strategy - **Model:** Freemium - **Tiers:** Free version with banner ads, Paid iOS version at $1.99, In-app purchase for Perfect OB Tracker upgrade - **Price:** iOS: $1.99 - **Analysis:** Hybrid model combining a low-cost upfront purchase on iOS with an ad-supported free tier on Android and optional IAP for professional tracking features. ## 🟢 User Sentiment (High Confidence: 61 of 61 reviews analyzed) {#user-sentiment} - **Overall Rating:** 4.92/5 - **Platform Split:** iOS 4.9/5 (3.5K ratings) - **Overall Sentiment:** Excited ### Top Praises - **Clinical utility of the calculation modules provides reliable support for busy prenatal care providers** ### Top Complaints (Impact Areas) - **Inconsistent trimester dating logic contradicts standard medical guidelines used by major professional organizations** ### Top Requests (What Users Want) - **Customizable cycle length settings are required to accommodate patients with non-standard menstrual patterns** ## SWOT Analysis {#swot} **Core Strengths:** - Clinical-grade multi-method calculation engine replaces physical paper wheels - Minimalist UI design minimizes cognitive load during high-pressure clinical shifts **Critical Frictions:** - Trimester dating logic contradicts established medical guidelines - Performance instability on specific Android builds causes application crashes **Growth Levers:** - Customizable cycle length settings would accommodate non-standard menstrual patterns - B2B partnerships with medical clinics could scale professional adoption **Market Threats:** - Free institutional alternatives with standardized medical logic threaten professional retention - Hidden monetization tiers drive negative sentiment among clinical users ## Recent Changes (v2 → v3) {#recent-changes} The app has entered a stagnant development phase while facing new professional credibility risks due to inaccurate medical dating logic. **Overall trend**: Mixed **Compared at**: 2026-05-20 ### High-impact changes - **[Added] Medical logic inaccuracy** (swot) — New weakness identified: trimester dating logic contradicts established medical guidelines, creating a professional credibility gap. - **[Shifted] Development velocity** (positioning) — App status shifted from active utility to stagnant/zombie state with no updates in nine months. ### Medium-impact changes - **[Added] Discrepancy Calculation** (features) — New feature added to quantify variance between LMP and ultrasound-based gestational age estimates. - **[Added] New user requests** (sentiment) — Users are now requesting customizable cycle length settings to accommodate non-standard menstrual patterns. ## Rivals Landscape {#rivals} > Competitive positioning identified by AI analysis of app features, category, and market signals. ### Perfect OB Wheel vs Pregnancy + | Tracker App — Head to Head - **[Pregnancy + | Tracker App](https://marlvel.ai/intel-report/medical/com-hp-pregnancyiphonelite)** by Philips Digital UK Limited: Dominates the pregnancy tracking market with massive scale and a comprehensive content-led ecosystem that dwarfs the utility-only focus of the target app. - **Moat strength:** High — sustainable advantage over 12 months - **Key differences:** - Offers a content-rich ecosystem including daily articles, expert advice, and 3D interactive models for users. - Monetizes through a freemium model with extensive premium content, contrasting with the target's simple paid utility. - Maintains a high-velocity release cadence with 6 updates in six months to keep engagement loops active. - **Where Perfect OB Wheel wins:** - ✅ Provides a specialized, clutter-free interface focused exclusively on clinical OB wheel calculations for medical professionals. - ✅ Avoids the bloat of social features and daily content feeds that distract from rapid clinical data entry. - **Where Pregnancy + | Tracker App wins:** - ❌ Leverages a massive content flywheel that keeps users returning daily for pregnancy milestones and health tips. - ❌ Provides a holistic pregnancy experience that captures users long before they need specific clinical due date calculations. - **Verdict:** The target app should defend its position as a specialized clinical tool, as it cannot compete with the massive content-driven network effects of this market leader. ### Contenders (Strong Challengers) - **[BabyCenter Track Pregnancy App](https://marlvel.ai/intel-report/medical/com-babycenter-mypregnancytoday)** by Everyday Health, Inc. [Moat: High]: A major player offering a robust community and expert-backed content platform that serves as a primary destination for expectant parents. - Integrates a large-scale community forum for peer-to-peer support which the target app lacks entirely. - Features a personalized daily feed that adapts content based on the user's specific gestational week. - **[Pregnancy Tracker・App by Moms](https://marlvel.ai/intel-report/medical/com-wachanga-pregnancy)** by Wachanga LTD [Moat: Medium]: Strong alternative that focuses on social-style tracking and milestone logging, appealing to the consumer-facing pregnancy market. - Includes social sharing and milestone photo features that turn clinical tracking into a personal memory log. - Utilizes a gamified interface to encourage consistent daily logging of symptoms and pregnancy progress. ### Peers (What They Do Better) - **[Baby Tracker - Newborn Log](https://marlvel.ai/intel-report/medical/com-nighp-babytracker)** by Nighp Software LLC: Adjacent utility app that captures the post-birth segment of the same user journey. - Focuses on post-partum logging such as feeding, sleep, and diaper changes rather than prenatal due date calculation. - Provides detailed data visualization and reporting tools for parents to track newborn health trends over time. - **[Contraction Timer & Counter 9m](https://marlvel.ai/intel-report/medical/com-slothdevel-contractions)** by Aleksei Neiman: Specialized utility app that targets the specific 'labor' phase of the pregnancy journey. - Optimized for high-pressure, real-time usage during labor with a simplified, large-button interface for timing contractions. - Provides immediate visual feedback on contraction frequency and duration to help users decide when to go to the hospital. - **[Medisafe Medication Management](https://marlvel.ai/intel-report/medical/com-medisafe-medisafe)** by MediSafe Inc.: Adjacent medical utility focused on medication adherence, sharing the clinical-utility category. - Features complex medication scheduling, drug interaction alerts, and caregiver notification systems for chronic condition management. - Uses a sophisticated reminder engine that is significantly more complex than the target app's calculator-based utility. ### New Kids on the Block (What's Innovative) - **[Migraine Buddy: Track Headache](https://marlvel.ai/intel-report/medical/com-healint-migrainebuddy)** by Voluntis: An emerging, highly specialized tracker that demonstrates how to build a loyal user base through deep, condition-specific data logging. ## What's New - **Latest (v33, 12 years ago):** Fixed sort menu appearance on iOS 7. - **Last Major (v34, 12 years ago):** Added iCloud synchronization for Perfect OB Tracker. ## App Momentum (Zombie) {#momentum} - Shipped enhanced iCloud synchronization. - Corrected international date line calculations. - Redesigned user interface modules. > **Cadence:** 5 total versions · 2 majors in last 6 months · 277 days since last update · 356 days avg between updates ## The "So What?" (Strategic Takeaway) {#so-what} Perfect OB Wheel is a market-leading medical app that is free with in-app purchases. With a 4.92/5 rating from 3.5K reviews, it delivers strong user satisfaction. > **Bottom Line:** Perfect OB Wheel maintains strong clinical retention through its specialized calculation engine, but the dating logic errors threaten its professional reputation, so the PM must prioritize medical accuracy over new feature development to prevent churn to institutional alternatives. **Best for:** Healthcare providers and obstetricians requiring precise, multi-method gestational dating tools, as well as patients seeking clinical-grade pregnancy tracking. ### PM Action Plan (Next Best Moves) - [ ] [PIVOT] [HIGH IMPACT] Audit trimester dating logic because it contradicts medical guidelines → restore professional credibility — *Specialists report dating discrepancies, which is the #1 threat to the app's professional-grade reputation.* _(trade-off: deprioritize Pause the UI redesign sprint — medical accuracy is a higher retention risk than visual polish.)_ - [ ] [INVEST] [MEDIUM IMPACT] Ship customizable cycle length settings because users request it for non-standard patterns → increase calculation accuracy — *Users currently manipulate data manually, indicating a clear gap in the core utility workflow.* _(trade-off: deprioritize Deprioritize the Android performance patch — cycle length is a high-value feature for the core clinical base.)_ ### Feature Gaps vs Competitors - Integrated community forum (available in BabyCenter but absent here) - Personalized daily content feed (available in Pregnancy+ but absent here) ### Outlook: Mixed The market for pregnancy utilities is consolidating around content-heavy platforms, leaving specialized tools like Perfect OB Wheel exposed if they fail to maintain clinical precision. The app must reconcile its dating logic with professional standards to retain its authority, as the current discrepancy creates a clear opening for institutional competitors to capture the professional segment. - 🔴 Inconsistent trimester dating logic contradicts medical guidelines, which erodes trust among board-certified specialists and risks professional churn. - 🟢 The minimalist interface design sustains high daily usage among clinicians, providing a stable retention base despite technical instability. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.92/5 | | Total Reviews | 3.5K | | Sentiment | Excited (85/100) | | Confidence | High | | Pricing Model | Freemium | | Platforms | iOS & Android | | Key Features | 3 analyzed | | Trend | Mixed | | Outlook | Mixed | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Perfect OB Wheel** (this app) | 4.92/5 | Excited | Evan Schoenberg | | [Pregnancy + | Tracker App](https://marlvel.ai/intel-report/medical/com-hp-pregnancyiphonelite) | 4.8/5 | Thrilled | Philips Digital UK Limited | | [Medisafe Medication Management](https://marlvel.ai/intel-report/medical/com-medisafe-medisafe) | 4.7/5 | Upset | MediSafe Inc. | | [Contraction Timer & Counter 9m](https://marlvel.ai/intel-report/medical/com-slothdevel-contractions) | 4.8/5 | N/A | Aleksei Neiman | | [Baby Tracker - Newborn Log](https://marlvel.ai/intel-report/medical/com-nighp-babytracker) | 4.9/5 | N/A | Nighp Software LLC | | [Migraine Buddy: Track Headache](https://marlvel.ai/intel-report/medical/com-healint-migrainebuddy) | 4.8/5 | N/A | Voluntis | ## Company Profile - **Developer:** Evan Schoenberg - **Website:** [https://drahbaweb.wuaze.com/](https://drahbaweb.wuaze.com/) ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/perfect-ob-wheel/id293656711?uo=2) - **Google Play:** [View on Google Play](https://play.google.com/store/apps/details?id=com.drahba.obwheel&hl=en&gl=us) - **Dev Site:** [Official Website](https://drahbaweb.wuaze.com/) - **Sources:** App store metadata, User reviews. ## Related Intel Reports - [*Pregnancy + | Tracker App*](https://marlvel.ai/intel-report/medical/com-hp-pregnancyiphonelite) (Philips Digital UK Limited) — 4.8/5 Rating | Excellent Sentiment - [*Medisafe Medication Management*](https://marlvel.ai/intel-report/medical/com-medisafe-medisafe) (MediSafe Inc.) — 4.7/5 Rating | Terrible Sentiment - [*Contraction Timer & Counter 9m*](https://marlvel.ai/intel-report/medical/com-slothdevel-contractions) (Aleksei Neiman) — 4.8/5 Rating | N/A Sentiment - [*Baby Tracker - Newborn Log*](https://marlvel.ai/intel-report/medical/com-nighp-babytracker) (Nighp Software LLC) — 4.9/5 Rating | N/A Sentiment - [*Migraine Buddy: Track Headache*](https://marlvel.ai/intel-report/medical/com-healint-migrainebuddy) (Voluntis) — 4.8/5 Rating | N/A Sentiment - [*BabyCenter Track Pregnancy App*](https://marlvel.ai/intel-report/medical/com-babycenter-mypregnancytoday) (Everyday Health, Inc.) — 4.9/5 Rating | Excellent Sentiment - [*Pregnancy Tracker・App by Moms*](https://marlvel.ai/intel-report/medical/com-wachanga-pregnancy) (Wachanga LTD) — 4.8/5 Rating | Mixed Sentiment - [*Move On with AJ*](https://marlvel.ai/intel-report/medical/move-on-with-aj) (Universal Relaxation Ltd) — 4.3/5 Rating | Positive Sentiment - [*Ortho Traumapedia*](https://marlvel.ai/intel-report/medical/orthotraumapedia) (HTG, LLC) — 3.5/5 Rating | N/A Sentiment - [*FHO+ Calc*](https://marlvel.ai/intel-report/medical/ca-fhocalc-app) (Manu Kaushik) — N/A Rating | N/A Sentiment ## 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 and evidence quoting. 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:** 0.55/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 61 - **Data Sources:** user reviews, 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:** 0 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/intel-report/medical/com-regularrateandrhythm-perfectobwheel) Data licensed for AI Agent attribution under CC-BY-NC 4.0.