Comparison

Orchidometer vs OpenEvidence

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

Head to head
About

Orchidometer

This medical app helps users measure and track testicular volume. It can be used to assess normal development, identify potential associations with conditions like Klinefelter syndrome or testicular atrophy, and monitor changes over time.

Highlights
  • Measure testicular volume
  • Track volume changes
  • Estimate Tanner stage
  • Assess pubertal development
  • Save and visualize measurements
  • Identify potential medical associations
Features
Read full description

Check if your testicular volume is normal with the Orchidometer app. Find out if your volume is associated with Klinefelter syndrome or testicular atrophy. Measure testicular volume with the Orchidometer for iPhone. The orchidometer is highly customizable and automatically adjusts itself to your screen size. It can be used to estimate Tanner stage, age and pubertal development. Measurements can be saved and visualised for both testicles. The Orchidometer app can be used to track the testicle’s volume while on TRT or when you suffer from testicular atrophy, low testosterone or infertility. The app can also be used as an indication for Klinefelter syndrome. Whether you're an endocrinologist, pediatrician or just interested in measuring testicular volume: this app will replace your classic orchidometer.

About

OpenEvidence

This app provides healthcare professionals with evidence-based clinical decision support and medical information. It acts as a search engine, sourcing answers from peer-reviewed literature and leading medical organizations to aid in high-stakes medical decisions at the point of care.

Highlights
  • Clinical decision support
  • Medical search engine
  • Sourced from peer-reviewed literature
  • FDA and CDC data integration
  • Partnerships with leading medical journals
  • Verified healthcare professional access
Features
Currently charting
Read full description

Clinical Decision Support & Medical Search Engine for Healthcare Professionals (NPI Required) OpenEvidence is the most widely used clinical decision support platform and medical search engine among U.S. clinicians. According to independent studies, more American physicians use OpenEvidence than all other AI platforms combined. OpenEvidence is trusted by millions of verified healthcare professionals to make high-stakes clinical decisions at the point of care with answers that are sourced, cited, and grounded in peer-reviewed medical literature. Founded with the mission to organize and expand the world's collective medical knowledge, OpenEvidence is actively used daily by the majority of physicians in the United States. OpenEvidence is free for all verified U.S. clinicians. AN OFFICIAL AI PARTNER OF: The New England Journal of Medicine (NEJM) The Journal of the American Medical Association (JAMA) and its 11 specialty journals National Comprehensive Cancer Network (NCCN) Nature Cochrane Library Wiley WHAT YOU GET: • Specific answers to clinical questions, with every claim cited to its source • 35 million+ peer-reviewed papers, 300+ medical journals, plus FDA and CDC sources • Licensed full text from NEJM, JAMA, Nature, Cochrane, and others • EvidenceGrade™: see the strength of the evidence behind every answer • CME and MOC credits, earned by asking questions • Visits for ambient documentation, Dialer for secure patient calls, and Voice Mode for hands-free answers CONTENT AGREEMENTS AND COLLABORATIONS: American Academy of Family Physicians (AAFP) American College of Cardiology (ACC) American Diabetes Association (ADA) American Academy of Pediatrics (AAP) American College of Obstetricians and Gynecologists (ACOG) American College of Emergency Physicians (ACEP) ASCO Guidelines American Academy of Orthopaedic Surgeons (AAOS) American Academy of Ophthalmology (AAO) American Urological Association (AUA) Plus AAO-HNS, GINA, SNO, SSO, and more. IN USE ACROSS: 10,000+ hospitals and medical centers nationwide, including Mayo Clinic, Mount Sinai, Cedars-Sinai, MSKCC, and Sutter Health. WHY CLINICIANS TRUST US: • HIPAA compliant across the platform • NEJM, JAMA, Nature, and NCCN—official content partners 
 • Tens of millions of clinical consultations per month WHAT CLINICIANS SAY: “OpenEvidence is currently the best AI tool for medical information.” — Dr. Paul Sax, Infectious Disease, Brigham and Women’s Hospital, Review in The New England Journal of Medicine Journal Watch (now NEJM Clinician) “In a morning report, a resident had a question that I didn’t know the answer to, but we were able to open OpenEvidence and get an answer on the spot.” — Dr. Kyle P. Lehenbauer, Minneapolis Veterans Affairs Medical Center “I use OpenEvidence multiple times during the day and every day. I am a better doc because of this. I expand my differential diagnoses and verify the science behind choices of treatments.” — Dr. Sharon E. Martin, Southern Huntingdon Medical Center Important note: OpenEvidence is available only to healthcare professionals. Users must verify their healthcare professional status before using OpenEvidence.

Screenshots

Orchidometer4 screens
OpenEvidence4 screens

Verdict

The call

The clearest difference is price: OpenEvidence at Free against Orchidometer's $7.99. OpenEvidence also leads on rating (4.9 vs 4.0) and ratings volume (12K vs 2). Orchidometer's advantage is review sentiment (100% vs 81%). On update cadence, 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

OpenEvidence is free to download; Orchidometer costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

OpenEvidence holds the better App Store score, 4.9 against 4.0. That said, the two scores are not equally well evidenced: OpenEvidence has 12K ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 100% of Orchidometer's written reviews are positive against 81% of OpenEvidence's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Orchidometer ships an update every 11 days, OpenEvidence weekly. The most recent releases landed on October 8, 2026 and October 21, 2026 respectively.

Scorecard6 real differences · 5 level
Orchidometer versus OpenEvidence: the parameters behind the verdict, then further details
ParameterOrchidometerOpenEvidence
Price$7.99Free — better
Rating4.0 (2 ratings)4.9 (12K ratings) — better
Positive reviews100.0% of reviews — better81.0% of reviews
Number of ratings212K — better
Update frequencyEvery 11 daysWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
Best chart rank—#31 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.1 — better
Further details — not scored
Size15 MB95 MB
Age rating12++17
DeveloperTotalContentOpenEvidence Inc.

Customer experience

Orchidometer

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

OpenEvidence

All ratings11,960 ratings
Positive98.7%
Neutral0.4%
Negative0.8%
Written reviews295 reviews
Positive81.0%
Neutral2.4%
Negative16.6%

Bugs and requests

Orchidometer

Not enough reviews yet to summarise bugs or requests.

OpenEvidence

Reported bugs

1 issue
  • App not working in latest update

Requested features

2 requests
  • Availability on MacBook
  • Integration with clinical workflows and EMRs

In-app purchases

None

Orchidometer

No in-app purchases

None

OpenEvidence

No in-app purchases

Questions

Is Orchidometer free?
Orchidometer costs $7.99, with no in-app purchases.
Is OpenEvidence free?
OpenEvidence is free to download, with no in-app purchases.
Which has better reviews, Orchidometer or OpenEvidence?
OpenEvidence is rated higher. Orchidometer averages 4.0 out of 5 from 2 ratings, while OpenEvidence averages 4.9 from 12K ratings.
Do Orchidometer or OpenEvidence have ads?
Neither Orchidometer nor OpenEvidence shows ads.
Which is updated more often, Orchidometer or OpenEvidence?
Orchidometer ships an update every 11 days, and OpenEvidence weekly. Most recently, Orchidometer was updated on October 8, 2026 and OpenEvidence on October 21, 2026.

Other comparisons