Comparison

D vs PrecisionOS

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

D

Features
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D-Brief is a multi-functional application that provides medical learners of all levels with rapid feedback on their performance. Several features are available and can be adjusted according to the level of the learner: Logbook * Evaluation of logbook reviewers Assessments (EPA and others) Daily recap Activity calendar Surveys Report of each type of evaluation, activities and surveys News feed This app is only available to university programs that opt ​​for this interactive assessment tool. * Senior learners are assessed every 4-6 hours of procedures, according to the Ottawa Surgical Competency Operating Room Evaluation. Evaluations are stored for later analysis. (Gofton, WT, Dudek, NL, Wood, TJ, et al. (2012). The Ottawa Surgical Competency Operating Room Evaluation (O-SCORE): a tool to assess surgical competence. Academic Medicine: Journal of the Association of American Medical Colleges, 87 (10), 1401–1407.).

About

PrecisionOS

This app provides surgical residents with just-in-time VR training modules directly linked to upcoming OR cases. It offers AI-guided preparation and personalized performance insights to accelerate learning and improve clinical skills.

Highlights
  • AI-guided case preparation
  • Personalized performance insights
  • Streamlined OR preparation
  • Advanced clinical realism
  • Extensive scenario library
Features
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JUST-IN-TIME TRAINING Turn your VR practice into measurable clinical improvement. Get Just-in-Time case recommendations, queue them directly to your headset, and review personalized performance insights that help you shine in the OR. PRECISIONOS: SURGICAL TRAINING, MEASURED. You are busy, and your training is driven by upcoming cases. Until now, VR has often felt extra-curricular, rather than a tool clearly tied to what you need to prepare for tomorrow in the OR. PrecisionOS solves this by introducing Just-in-Time training. We connect your VR headset training directly to your mobile device, transforming your surgical practice into a timely, structured, and personalized curriculum. Join elite programs across 35 countries using PrecisionOS to accelerate your learning where it counts. KEY FEATURES: AI-Guided Case Preparation (Beta): Stop guessing what to practice. Chat with Delphi, your Attending Mentor, to ask, "What should I prep for my upcoming Jones Fracture?" and get routed to the exact simulation needed to master the procedure before you scrub in. Actionable Personalized Performance Insights: Turn your raw data into measurable clinical improvement. After every session, you receive a detailed breakdown highlighting what you did well, identifying specific gaps, and recommending exactly what you should tackle next. Streamlined OR Prep: Send recommended training modules directly to your headset from the mobile app, ensuring your limited VR time is highly efficient and aligned with your clinical needs. Advanced Clinical Realism: Practice on a massive, growing library of scenarios. Our latest update expands realism with new elbow and knee positioning, polytrauma scenarios, foot & ankle procedures, and an interactive saw. THE FUTURE OF SURGICAL EDUCATION IS NOW. At the center of this new experience are our personalized insights and guided prep, currently in Beta. We invite you, our community of residents, surgeons, and educators, to provide direct feedback within the app to help shape how this curriculum evolves. Download PrecisionOS to make your surgical training deliberate, measurable, and adaptive.

Screenshots

D3 screens
PrecisionOS4 screens

Verdict

The call

The clearest difference is update cadence: PrecisionOS at every 6 weeks against D's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

D ships an update every 3 months, PrecisionOS every 6 weeks. The most recent releases landed on October 5, 2026 and October 20, 2026 respectively.

Scorecard1 real difference · 8 level
D versus PrecisionOS: the parameters behind the verdict, then further details
ParameterDPrecisionOS
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 3 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesNoNo
Monetization—Ad-supported
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.1
Further details — not scored
Size14 MB116 MB
Age rating4+17+
DeveloperD-Briefe IncPrecisionOS

In-app purchases

None

D

No in-app purchases

None

PrecisionOS

No in-app purchases

Questions

Is D free?
D is free to download, with no in-app purchases.
Is PrecisionOS free?
PrecisionOS is free to download, with no in-app purchases.
Do D or PrecisionOS have ads?
Neither D nor PrecisionOS shows ads.
Which is updated more often, D or PrecisionOS?
D ships an update every 3 months, and PrecisionOS every 6 weeks. Most recently, D was updated on October 5, 2026 and PrecisionOS on October 20, 2026.

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