ObCalc Downloads & RevenueObCalc · App Store
ObCalc is #11 in Medical Paid in Italy and charting in 1 of 30 countries we track.
Updated 11 Nov 2026 · rankings refresh through the day
DeveloperCode Nine Labs LLC
CategoryMedical
Price6.99 USD
Released
Rating★ 0.0 (0)
Version3.2.0+1
Age rating17+
First seen by us
25 Sep 2026
25 Sep 2026📈Entered the top 100📈Charting in a new country📦Updated to version 3.2.0+1💰Price rise✏️New screenshots💰Price rise✏️New screenshots📦Updated to version 3.1.1+2🆕First spotted by AppInsider🆕Released on the App Store
Full timeline · 15 events
- 📈ObCalc entered the top 100Top Grossing · Medical · IT
- 📈ObCalc charting in a new countryItaly
- 📈ObCalc entered the top 100Top Paid · Medical · US
- 📦ObCalc updated to version 3.2.0+1Ready for iPhone Duo
- 💰ObCalc: price rise2.99 USD → 6.99 USD · US
- ✏️ObCalc: new screenshots7 screenshots (was 7) · US
- 💰ObCalc: price rise299.00 INR → 699.00 INR · IN
- ✏️ObCalc: new screenshots7 screenshots (was 7) · DE
- ✏️ObCalc: new screenshots7 screenshots (was 7) · IN
- 📦ObCalc updated to version 3.1.1+2Added minor improvements and acknowledgements
- 📈ObCalc entered the top 100Top Paid · Medical · DE
- 📈ObCalc charting in a new countryGermany
- 🆕ObCalc first spotted by AppInsider#82 in Top Paid · Medical · India
- 📦ObCalc version 3.1.0+4• Added new tool for VBAC at Delivery Admission
• Added ability to set app wide preferred units
• Added more units of measurement - 🆕ObCalc released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
0.0 ★
0 ratings
Measured
Best rank now
#11
Medical PaidMeasured
ObCalc on the App Store
App details
App ID
983427276
Publisher
Code Nine Labs LLC
On the store since
May 2015
11 years on the store
Minimum OS
iOS 26.0+
iPhone 11 and later
Devices
iPhone · iPad
Universal purchase
Content rating
17+
1 content note below
Languages
1
EN
Size
3 MB
Also listed in
Utilities
Content notesFrequent/Intense Medical/Treatment Information
Where ObCalc's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Italy | MedicalPaid | #11 |
| Italy | MedicalGrossing | #71 |
Apps near ObCalc on the chart
Medical Paid, around #11.
Ratings
App Store, worldwide.
Rating
0.0 ★
0 ratings
Measured
Ratings
0
Measured
What users say about ObCalc
From recent reviews.
About ObCalc
ObCalc puts the calculators, scoring tools, and reference charts that obstetrics, maternal-fetal medicine, and labor & delivery teams reach for every shift into one fast, offline-first app.
Every formula is sourced to published guidelines (ACOG, SMFM, CMQCC, NICHD) and built as a clinical tool first — clean inputs, clear interpretation, no clutter.
OBSTETRICS
• Bishop Score
• Estimated Due Date — LMP, ultrasound, conception, ovulation, or IVF transfer dating
• Pregnancy Re-dating (ACOG Committee Opinion 700)
• Pregnancy Weight Gain Tracker
• Urine Protein:Creatinine Ratio (UPCR)
• VBAC Success Calculator — Grobman MFMU model
• VBAC at Delivery Admission Success Calculator — Grobman MFMU model
PERINATOLOGY / MFM
• CVR (CPAM Volume Ratio)
• Extremely Preterm Birth Outcome (NICHD)
• Fetal Biometry Suite — Hadlock EFW, long-bone ratios, multi-panel z-scores and percentiles
• Intrauterine Transfusion (IUT) Volume Calculator
• MCA Doppler / PSV for Fetal Anemia
• Neonatal Morbidity Risk
• Ponderal Index
• GDM Insulin Dosing
• Life-Limiting Skeletal Dysplasia Screen
• Twin Discordance
• Umbilical Artery Doppler
GENERAL
• Anion Gap • Apgar Score • BMI • Iron Deficit • Peak Flow
• Gestational Age (date difference)
• Maternal Sepsis Assistant (qSOFA / Sepsis-3)
• CMQCC Sepsis Screen
THROMBOPHILIA
• VTE Anticoagulation Dosing (ACOG Practice Bulletin 196)
GENETICS
• cfDNA PPV/NPV Calculator
• Nuchal Translucency Percentile
WHY CLINICIANS CHOOSE OBCALC
• Offline-first — no connection needed on L&D
• Fast, distraction-free interface — no ads, no tracking
• One-time purchase. No subscription, no account required
• Regularly updated with new tools and guideline changes
• Built-in unit conversion and inline number-pad arithmetic on every input
ObCalc is a clinical reference tool intended for use by licensed healthcare professionals. It does not replace clinical judgment, and results should be confirmed against current guidelines and your institution's protocols.
Every formula is sourced to published guidelines (ACOG, SMFM, CMQCC, NICHD) and built as a clinical tool first — clean inputs, clear interpretation, no clutter.
OBSTETRICS
• Bishop Score
• Estimated Due Date — LMP, ultrasound, conception, ovulation, or IVF transfer dating
• Pregnancy Re-dating (ACOG Committee Opinion 700)
• Pregnancy Weight Gain Tracker
• Urine Protein:Creatinine Ratio (UPCR)
• VBAC Success Calculator — Grobman MFMU model
• VBAC at Delivery Admission Success Calculator — Grobman MFMU model
PERINATOLOGY / MFM
• CVR (CPAM Volume Ratio)
• Extremely Preterm Birth Outcome (NICHD)
• Fetal Biometry Suite — Hadlock EFW, long-bone ratios, multi-panel z-scores and percentiles
• Intrauterine Transfusion (IUT) Volume Calculator
• MCA Doppler / PSV for Fetal Anemia
• Neonatal Morbidity Risk
• Ponderal Index
• GDM Insulin Dosing
• Life-Limiting Skeletal Dysplasia Screen
• Twin Discordance
• Umbilical Artery Doppler
GENERAL
• Anion Gap • Apgar Score • BMI • Iron Deficit • Peak Flow
• Gestational Age (date difference)
• Maternal Sepsis Assistant (qSOFA / Sepsis-3)
• CMQCC Sepsis Screen
THROMBOPHILIA
• VTE Anticoagulation Dosing (ACOG Practice Bulletin 196)
GENETICS
• cfDNA PPV/NPV Calculator
• Nuchal Translucency Percentile
WHY CLINICIANS CHOOSE OBCALC
• Offline-first — no connection needed on L&D
• Fast, distraction-free interface — no ads, no tracking
• One-time purchase. No subscription, no account required
• Regularly updated with new tools and guideline changes
• Built-in unit conversion and inline number-pad arithmetic on every input
ObCalc is a clinical reference tool intended for use by licensed healthcare professionals. It does not replace clinical judgment, and results should be confirmed against current guidelines and your institution's protocols.
Latest updates
3.2.0+1
Ready for iPhone Duo
3.1.1+2
Added minor improvements and acknowledgements
3.1.0+4
• Added new tool for VBAC at Delivery Admission
• Added ability to set app wide preferred units
• Added more units of measurement
Store changes
What ObCalc changed on its store page: name, icon, screenshots, price, size, languages, requirements.
Price rise 
2.99 USD → 6.99 USD
New screenshots
7 screenshots (was 7)
Price rise
299.00 INR → 699.00 INR