CobbMeter CE vs Bullets*
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CobbMeter CE
This medical tool transforms your iPhone into a professional measuring device for spinal radiographs. It accurately calculates Cobb angle, kyphosis angle, and sacral slope, aiding spinal care professionals in diagnosis and treatment planning.
- Measures Cobb angle
- Measures kyphosis angle
- Measures sacral slope
- Uses iPhone position sensor for accuracy
- Logs and emails measurements
- Calibration for horizontal plane measurements
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CobbMeter is a medical tool designed to measure the Cobb angle, the kyphosis angle, and the sacral slope on vertical spine radiographs. It is intended to the Spinal care professional, and turns the iPhone into a professional measuring tool. " I designed CobbMeter with Regis Rigal as the professional tool I had always needed in my everyday practice in both Orthopedic Spine Surgery and Spinal non operative care. A tool that fits in the pocket in the very same device that I use to manage my busy schedule, that I can call immediately by pressing an icon, and which can be used on both regular radiographs or even a (vertical) computer screen to measure accurately the Cobb angle in spinal deformities, but also the kyphosis angle in spinal fractures and the sacral slope in degenerative and deformitic conditions. All that one has to do in using the device is align the side of the iPhone to the standard tracings we use routinely, and the position sensor built in the iPhone will do the rest. The precision of the device itself is 1/10th of a degree, far more precise than the precision of the measure as determined in everyday practice and the literature. Measures are logged for further use and may be sent by e-mail to the surgeon or staff for recording purposes, with the levels of the measured curve, type of curve and patient id or number. A calibration procedure was also implemented to accurately measure the angle with the horizontal plane as in the sacral slope. Through though the developpement, Regis has shown an extraordinary sense of patience and astounding programming skills so as to accurately provide a tool that fits the needs of the surgeon and the spine care provider to best treat the patients ; and I thank him for his efforts. I am very proud of releasing this small software in the community, and I hope it will facilitate a little bit the life of my dear colleagues and the patients. I thank the colleagues who gave me their kind advice on the software during its developpement and wish they will find it useful." Dr Frederic Jacquot Chirurgien du Rachis Chirurgien Orthopédiste, Chirurgien des Hôpitaux de Paris
Bullets*
Access medical and orthopedic educational content, including topics, questions, and cases. Create custom exams, review scientific articles, and monitor community activity. Earn CME credits through self-assessment exams and collaborative learning.
- Medical and orthopedic topics
- Customizable exams (Testmaster)
- Article review with PDFs
- Community activity feed
- Earn CME credits
- Point of Care Learning (PoCL)
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The companion APP for Orthobullets.com and Medbullets.com. Bullets* contains medbullets and orthobullets Topics, Questions, Techniques, Cases, Videos, and Evidence. Our Testmaster allows you to create, take, and review customized exams. Article links allows for quick review of scientific abstracts and often the PDF is provided and can be viewed on your phone. Our "Home" screen allows you to monitor a thread of educational activity within our community. All educational activity, including the Qbank, is synced with the main platform for seamless use on both your iPhone APP and computer. You can earn CME by taking Self-Assessment Exams and contributing to our free collaboration community by posting educational comments with scientific references as part of our Point of Care Learning (PoCL) activity. All CME Study Plan examinations can be taken on the iPhone and can be found on your CME Dashboard. Residents on the PASS institutional platform can take PASS exams, complete their PASS Skillmaster learning modules, and submit both Rotation and Milestone Skill Evaluations to faculty. Faculty members using PASS Pro 2.0 can grade Rotation Evaluations and Milestone Skill Evaluations on the APP, eliminating the need to log in with each evaluation.
Screenshots
Verdict
The clearest difference is price: Bullets* at Free against CobbMeter CE's $8.99. Bullets* also leads on review sentiment (68% vs 25%) and rating (4.0 vs 1.8). CobbMeter CE's advantage is iOS requirement (6.0 vs 13.0). 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
Bullets* is free to download; CobbMeter CE costs $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Bullets* holds the better App Store score, 4.0 against 1.8. That said, the two scores are not equally well evidenced: Bullets* has 61 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 25% of CobbMeter CE's written reviews are positive against 68% of Bullets*'s.
CobbMeter CE ships an update every 2 weeks, Bullets* every 8 days. The most recent releases landed on September 29, 2026 and October 6, 2026 respectively.
| Parameter | CobbMeter CE | Bullets* |
|---|---|---|
| Price | $8.99 | Free — better |
| Rating | 1.8 (5 ratings) | 4.0 (61 ratings) — better |
| Positive reviews | 25.0% of reviews | 67.6% of reviews — better |
| Number of ratings | 5 | 61 — better |
| Update frequency | Every 2 weeks | Every 8 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 6.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 4 MB | 168 MB |
| Age rating | 12+ | 17+ |
| Developer | Regis RIGAL | LineageMedical Inc |
Customer experience
CobbMeter CE
Bullets*
In-app purchases
CobbMeter CE
No in-app purchases
Bullets*
No in-app purchases









