Comparison

Joining Forces vs Primal's 3D Knee

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

Head to head
About

Joining Forces

This app provides mental health resources and support for UK Armed Forces personnel, veterans, and their families. It connects users with information and services from the NHS and MOD Joint Medical Command.

Highlights
  • Mental health information
  • Support signposting
  • Resources for service personnel
  • Resources for veterans
  • Resources for families and friends
  • NHS and MOD integration
Features
Read full description

This app delivers information and signposting surrounding mental health for UK Armed Forces Service Personnel. As well as being useful for serving personnel, it may be useful for those who have left military services (the Veterans Community), and also for family and friends. The Joining Forces Network is a fully integrated team across the NHS and the MOD Joint Medical Command, including 5 NHS Trusts, and 2 Scottish providers. The Network is led by Midlands Partnership University NHS Foundation Trust (MPFT).

About

Primal's 3D Knee

Features
Read full description

Primal's 3D Real-time Human Anatomy app for the Knee is the ultimate 3D interactive anatomy viewer for all medical educators, practitioners and students. Meticulously built over ten years from high-resolution cross-sectional photographs of real cadavers, the app provides an accurate and visually stunning reconstruction of the anatomy of the knee. The easy to use and intuitive interface lets you choose precisely the anatomy you want to see, from exactly the angle you want to see it. This flexibility is supported by a wealth of user-friendly tools to help you set up your ideal anatomical image, quickly and easily: โ€ข The Gallery contains 9 pre-set scenes, designed by an in-house team of anatomical experts, to clearly and comprehensibly present in-depth regional and systemic anatomy of the knee. Each scene is divided into five layers to provide greater control over the depth of anatomy shown; making tailoring the anatomy you want to see simple and quick. โ€ข The Contents folders arrange all 225 structures systemically, meaning you can browse by subcategory and switch all related structures on at once. It provides an excellent learning tool โ€“ for example turn on all branches of the popliteal artery, or the muscles of the lateral compartment of the leg. โ€ข The Contents layer controls split each system into five layers โ€“ from deep to superficial. This allows you to quickly build up different systems to the depth you want to see. **Save to Favourites** Save the views you create for later in the Favourites, save anything as an image, or share with another user as a URL link. Use the pins, labels and drawing tools to customize your images for enlivened presentations, engaging course materials and handouts โ€“ all from your iPad! **Informative** Read detailed and accurate text for each structure using the T icon, and in a feature unique to Primal Pictures, each anatomical term in the text is linked to the appropriate model in the 3D model. Selecting these links will highlight the relevant structures, bringing the text to life and make learning anatomy more visual and immediate. **Context** See each structure in context with the anatomy that surrounds it. Explore these relationships and easily navigate to related anatomical structures to expand your learning. Select a field name in the right-hand menu to show the anatomical category and sub-category of the structure for added understanding and simple navigation. **Technical Specifications** iPad 3 and above only. iPad Air and above for optimal viewing. iPhone 6 and above for best performance.

Screenshots

Joining Forces4 screens
Primal's 3D Knee4 screens

Verdict

The call

The clearest difference is in-app purchases: Joining Forces at none against Primal's 3D Knee's 1. Primal's 3D Knee's advantage is update cadence (every 2 months vs every 8 months). On price, ads, device support and iOS requirement there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Primal's 3D Knee sells 1 one-off in-app purchase. Joining Forces asks for nothing beyond the download.

UpkeepUpdate frequency

Joining Forces ships an update every 8 months, Primal's 3D Knee every 2 months. The most recent releases landed on October 14, 2026 and October 8, 2026 respectively.

Scorecard2 real differences ยท 6 level
Joining Forces versus Primal's 3D Knee: the parameters behind the verdict, then further details
ParameterJoining ForcesPrimal's 3D Knee
PriceFreeFree
Positive reviews71.4% of reviewsโ€”
Update frequencyEvery 8 monthsEvery 2 months โ€” better
AdsNoNo
In-app purchasesNo โ€” betterYes
MonetizationFreeโ€”
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.115.0 โ€” better
Further details โ€” not scored
Size16 MB125 MB
Age rating17+12+
DeveloperSouth Staffordshire and Shropshire Healthcare NHS Foundation TrustPharma Intelligence UK Ltd

In-app purchases

None

Joining Forces

No in-app purchases

1 purchases

Primal's 3D Knee

One-time1
  • Primal's 3D Knee$39.99

Questions

Is Joining Forces free?
Joining Forces is free to download, with no in-app purchases.
Is Primal's 3D Knee free?
Primal's 3D Knee is free to download, with in-app purchases available.
Do Joining Forces or Primal's 3D Knee have ads?
Neither Joining Forces nor Primal's 3D Knee shows ads.
Which is updated more often, Joining Forces or Primal's 3D Knee?
Joining Forces ships an update every 8 months, and Primal's 3D Knee every 2 months. Most recently, Joining Forces was updated on October 14, 2026 and Primal's 3D Knee on October 8, 2026.

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