SpinopelvicMobilityApp vs ChatPDF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SpinopelvicMobilityApp
Read full descriptionHide full description
Evaluation of lateral radiographs in sitting and standing positions is of importance, especially in patient before total hip replacement surgery.The importance of understanding the hip spine relationship and the spinopelvic mobility has become increasingly recognised in recent years as a cause of hip instability with no previous known aetiology. Spinopelvic motion is a coordinated biomechanical relationship among acetabular anteversion, pelvic tilt, and lumbar lordosis. Hip instability due to spinopelvic mobility, specifically the move from standing to sitting, and the subsequent changes in pelvic orientation is associated with late dislocations in hip replacement surgery and revision. Awareness of this phenomenon by hip and spine surgeons and pre and post operative evaluation of the hips help guide the surgeon to the ideal location for cup implantation or to address the spine or hip pathology accordingly. Radiographic measurement in lateral radiographs in sitting and standing positions of Pelvic incidence (PI), Sacral Tilt (ST), Ante-Inclination (AI), Sacro-acetabular angle (SAA) , Pelvic femoral Angle Angle (PFA) and Combined Sagittal Index (CSI) are of paramount importance. These data measured in standing and in sitting X-rays and compared both with normal reference data may help to evaluate and plan treatment strategies. In clinical settings measuring all these angles is cumbersome and App comes to help the surgeon to do the job without loosing time. The Spinopelvic Mobility App is medical software aimed for orthopaedic surgeons, providing tools that allow doctors to: -Securely import medical images directly from the camera or stored photos. -By marking few points at the image of X-ray, the App calculates and offers a very convenient way to determine the most possibly accurate way at once, Combined Sagittal Index (CSI) ,Pelvic incidence (PI), Sacral Tilt (ST), Ante-Inclination (AI), Sacro-acetabular angle (SAA) , Pelvic femoral Angle Angle (PFA). According to measured parameters in standing and sitting lateral x- rays the app helps to identify patterns of spinopelvic mobility namely normal, hypermobile or three patterns of spinal imbalance: hips maintained in anterior tilt (stuck standing), hips held in posterior tilt (stuck sitting), or stiff hips or kyphotic sacrum and predict by CSI the possible direction of THA dislocation. -Save the planned images, for later review or consultation.The measured values are compared by normal reference databases and also data are exported as txt file, ready to print or to input as cells to excel for research. -The app allows choosing points in an in independent manner from order and thus it is easy to be learned and in case of wrong selection powerful undo feature is present. All information received from the software output must be clinically reviewed regarding its plausibility before patient treatment! Spinopelvic Mobility App indicated for assisting healthcare professionals. Clinical judgment and experience are required to properly use the software.The software is not for primary image interpretation. The build in feature of the app, allows results to be categorized may help decide what could be considered normal or pathologic. This App is particular useful in clinical settings where you need a quick results without loosing time. Please see tutorial videos at the developer’s web site www.orthopractis.com Reference 1.Lum ZC ,et al The Current Knowledge on Spinopelvic Mobility.J Arthroplasty. 2018 Jan;33(1):291-296. 2.Stefl M et all Spinopelvic mobility and acetabular component position for total hip arthroplasty. Bone Joint J. 2017 Jan;99-B(1 Supple A):37-45. 3.Tezuka T et al . Functional safe zone is superior to the Lewinnek safe zone for total hip arthroplasty: why the Lewinnek safe zone is not always predictive of stability. J Arthroplasty. 2019;34:3–8. 4. Heckmann N et al JBJS. 2018;100:1845–53.
ChatPDF
This AI-powered tool allows you to ask questions and get summaries directly from your PDF documents. It supports multiple files, OCR, and multilingual interactions, making complex information easily accessible.
- Instant answers from PDFs
- Quick document summaries
- Chat with multiple PDFs
- OCR for scanned documents
- Multilingual support
- Cross-device access
Read full descriptionHide full description
ChatPDF lets you ask questions, request summaries, or quickly find the information you need—powered by advanced AI that understands your documents. Simply upload your PDF and start chatting. Ideal for students, researchers, and professionals, ChatPDF helps you effortlessly grasp complex research papers, academic articles, or any document you care about. Key Features: • Instant Answers: Ask questions directly to your PDFs and receive accurate responses based entirely on your document's content. • Quick Summaries: Save time and boost your understanding with concise, clear summaries of lengthy texts. • Multi-PDF Chat: Manage multiple documents seamlessly by chatting with several PDFs at once. • OCR Support: Easily extract text from scanned documents or images, making even printed PDFs fully searchable. • Multilingual Support: Engage with your documents in any language, simplifying global research and collaboration. • Robust Data Security: Your privacy matters. ChatPDF keeps your documents confidential with advanced data protection measures. • Cross-Device Access: ChatPDF runs smoothly on phones, tablets, and desktops, providing seamless document interactions wherever you are. • Trusted by Experts: Used and trusted by researchers from renowned institutions such as Stanford and Harvard for reliable, swift document analysis. • Multiple File Formats: Beyond PDFs, ChatPDF supports a variety of file formats, giving you flexible document management options. https://chat-pdf.notion.site/ChatPDF-Terms-of-Service-6a422751d9b74ad8893dea50fd970270ChatPDF is your essential tool for smarter document engagement. Whether you're studying, preparing presentations, or simply trying to make sense of complex material, ChatPDF turns your documents into clear, insightful conversations. Download now and revolutionize the way you work with PDFs! Terms of service & privacy policy: https://chat-pdf.notion.site/ChatPDF-Privacy-Policy-45fa3cf8bac8483896eb09b108f0c0f2 https://chat-pdf.notion.site/ChatPDF-Terms-of-Service-6a422751d9b74ad8893dea50fd970270
Screenshots
Verdict
The clearest difference is price: ChatPDF at Free against SpinopelvicMobilityApp's $9.99. ChatPDF also leads on update cadence (every 4 days vs every 10 months). SpinopelvicMobilityApp's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support and iOS requirement 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
ChatPDF is free to download; SpinopelvicMobilityApp costs $9.99 up front. ChatPDF sells 2 in-app purchases, starting at $14.99 per month. SpinopelvicMobilityApp asks for nothing beyond the download.
SpinopelvicMobilityApp ships an update every 10 months, ChatPDF every 4 days. The most recent releases landed on October 7, 2026 and October 16, 2026 respectively.
| Parameter | SpinopelvicMobilityApp | ChatPDF |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | — | 4.6 (92 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | — | 92 — better |
| Update frequency | Every 10 months | Every 4 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.6 |
| Further details — not scored | ||
| Size | 1 MB | 41 MB |
| Age rating | 17+ | 4+ |
| Developer | ORTHOPRACTIS.COM SINGLE MEMBER P.C. | ChatPDF GmbH |
In-app purchases
SpinopelvicMobilityApp
No in-app purchases
ChatPDF
- Monthly Plus Subscription$14.991 Month
- ChatPDF Yearly Plus Plan$89.991 Year
Questions
Is SpinopelvicMobilityApp free?
Is ChatPDF free?
Do SpinopelvicMobilityApp or ChatPDF have ads?
Which is updated more often, SpinopelvicMobilityApp or ChatPDF?
Other comparisons















