Comparison

Bone Age vs Skeletal Plan

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

Head to head
About

Bone Age

This medical app calculates bone age using the Tanner-Whitehouse method, offering TWII and TWIII references for 'RUS', 'TW20', and carpal scores directly in a clinical setting.

Highlights
  • Tanner-Whitehouse method calculation
  • TWII and TWIII references
  • RUS score calculation
  • TW20 score calculation
  • Carpal score calculation
  • In-clinic use
Features
Read full description

Calculate a bone age without using an atlas right there in clinic using the Tanner-Whitehouse method. Both TWII and TWIII references are included, to give 'RUS', 'TW20' and even carpal scores.

About

Skeletal Plan

Features
Read full description

Skeletal Plan is a pre-operative planning and documentation aid for spine surgeons. Plan the construct, scan the implants you use, and keep a structured operative record. It runs entirely on your device and works offline. PLAN Design the construct level by level across the whole spine: pedicle and lateral-mass screws, hooks, rods, interbody and corpectomy cages, plates, osteotomies (Schwab 1 to 6) and correction forces. Work on normal anatomy or anatomical variants such as transitional lumbosacral levels. Population-based reference dimensions from the published adult morphometry literature help you start from a sensible size, which you then verify against the patient's own imaging. SCAN, OR JUST RECORD Record the implants actually used. Scan the barcode on the packaging to auto-fill the manufacturer, system, size, lot number and expiry date, or enter the sizes by hand when screws arrive on a non-sterile tray with nothing to scan. The scanner reads GS1 DataMatrix, GS1-128 and two-part HIBC labels and matches them against a curated catalogue of more than 90,000 implant references. KEEP Keep a clean record that stays useful long after the case: - A PDF for the patient record and operative notes - An implant inventory for stock and cost - Lot and expiry traceability for audit - Structured data for research PRIVATE BY DESIGN Skeletal Plan has no servers, no accounts, no analytics and no advertising. Everything you enter, including any patient information, stays on your device, encrypted at rest, and is never sent to us or anyone else. Session privacy is on by default, so nothing is stored unless you choose to save it. You decide if and where a plan is ever shared. WORKS ANYWHERE Designed for theatre: a tablet at the planning station or a phone in your pocket, with the same app on a desktop or laptop web browser. All resources are bundled in the app, so it keeps working with no network. Available in 22 languages, including right-to-left scripts (Arabic, Hebrew) and Chinese, Japanese and Korean. FREE FOR CLINICAL USE Free for clinical planning, intra-operative documentation, teaching and research. IMPORTANT Skeletal Plan is a documentation and communication aid for surgical planning. It is not a medical device and has not been approved, cleared or certified by any regulatory body. Population-based reference data represents group averages; individual anatomy varies, and the operating surgeon must verify all dimensions against the patient's own imaging and bears full responsibility for all clinical decisions and for verification at the point of use.

Screenshots

Bone Age4 screens
Skeletal Plan4 screens

Verdict

The call

The clearest difference is price: Skeletal Plan at Free against Bone Age's $7.99. Skeletal Plan also leads on update cadence (every 9 days vs every 3 months). Bone Age's advantage is iOS requirement (13.0 vs 15.5). On 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

Skeletal Plan is free to download; Bone Age costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Bone Age ships an update every 3 months, Skeletal Plan every 9 days. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 7 level
Bone Age versus Skeletal Plan: the parameters behind the verdict, then further details
ParameterBone AgeSkeletal Plan
Price$7.99Free — better
Rating2.3 (3 ratings) — better—
Positive reviews25.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 3 monthsEvery 9 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.5
Further details — not scored
Size15 MB111 MB
Age rating17+17+
DeveloperSimon ChapmanN2 Medical Ltd

In-app purchases

None

Bone Age

No in-app purchases

None

Skeletal Plan

No in-app purchases

Questions

Is Bone Age free?
Bone Age costs $7.99, with no in-app purchases.
Is Skeletal Plan free?
Skeletal Plan is free to download, with no in-app purchases.
Do Bone Age or Skeletal Plan have ads?
Neither Bone Age nor Skeletal Plan shows ads.
Which is updated more often, Bone Age or Skeletal Plan?
Bone Age ships an update every 3 months, and Skeletal Plan every 9 days. Most recently, Bone Age was updated on November 1, 2026 and Skeletal Plan on October 31, 2026.

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