Perfect OB Wheel is a clinical-grade gestational age and due date calculator for healthcare providers and patients on iOS and Android.
Product velocity
Dormant
Daily rank 🇺🇸
#31
▲12Medical · paid
Sentiment
4.9
4k reviews
Nemesis
Pregnancy + | Tracker App
The App DNA
What makes this app unique?
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.
For Healthcare providers and obstetricians requiring precise, multi-method gestational dating tools, as well as patients seeking clinical-grade pregnancy tracking.
What does it look like?
Key features
Computes gestational age and due date using LMP, USG, CRL, IVF, HC, and SFH inputs
Quantifies variance between LMP-based and ultrasound-based gestational age estimates
Stores pregnancy data, notes, and images for multiple patients with passcode protection
How much does it cost?
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.
Velocity
Dormant developmentUX improvementsperformanceShow more...
The app has been inactive for over 9 months, with the most recent release occurring on August 15, 2025. Prior to this, there was a significant gap in development activity dating back to 2021. The development trend is currently stagnant, as no updates have been pushed to the store in the last three quarters. The latest release focused on UI redesign and calculation modules, but the lack of subsequent activity indicates a maintenance or abandoned state.
Who built it?
Evan Schoenberg
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Perfect OB TrackerUser Sentiment
What do users think recently?
Fresh user feedback skews excited. Users appreciate clinical utility of the calculation modules provides reliable support for busy prenatal care providers, but report inconsistent trimester dating logic contradicts standard medical guidelines used by major professional organizations.
How are ratings & reviews evolving?
What users say, by theme
- Clinical utility of the calculation modules provides reliable support for busy prenatal care providers
- Inconsistent trimester dating logic contradicts standard medical guidelines used by major professional organizations
61 of 61 recent reviews analyzed · high confidence · Excited overall
Read the full review analysisUnlock 1 user request, each backed by review evidence.
Access the full report for freeCompetition
Competitive landscape for Perfect OB Wheel
How's the Medical market?
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.
Read the market outlookThe rivals identified
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 this app.
- 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 this app's simple paid utility.
- Maintains a high-velocity release cadence with 6 updates in six months to keep engagement loops active.
Unlock the head-to-head verdict: where this rival wins, and where it loses.
Access the full report for freeThe Analyst's Read
Key takeaways for Perfect OB Wheel
Where is it heading?
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.
The SWOT
- Clinical-grade multi-method calculation engine replaces physical paper wheels
- Minimalist UI design minimizes cognitive load during high-pressure clinical shifts
- Customizable cycle length settings would accommodate non-standard menstrual patterns
- B2B partnerships with medical clinics could scale professional adoption
Next best moves
Audit trimester dating logic because it contradicts medical guidelines → restore professional credibility
+ 1 more prioritized moveThe counter-intuitive read
The app's reliance on a paid utility model…
Read the full takeFeature gaps
Integrated community forum (available in BabyCenter but absent here) +1
Since the last report: The app has entered a stagnant development phase while facing new professional credibility risks due to inaccurate medical dating logic.
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.
Unlock 2 critical frictions, 2 market threats, 1 more prioritized move and the analyst’s take.
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