Comparison

Perseus vs OsteoPlan

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

Head to head
About

Perseus

Features
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Perseus guides the surgeon during femoral resection in TKA. Data acquired through a Bluetooth LE inertial sensor provide angle information for a better prosthesis alignment. All in three simple steps: -Press Start and select Left or Right limb -Start data Acquisition -Follow app instruction on Cutting guide positioning Visit our website for further information: http://www.smartperseus.com/ Perseus is an Orthokey Italia srl product: http://www.orthokey.com/

About

OsteoPlan

Features
Read full description

OsteoPlan is an all-in-one orthopaedic planning, measurement, operative note, and case management app for surgeons and trainees. Designed by an Orthopaedic Surgeon, it is built around real clinical workflows for planning, documentation, teaching, and follow-up. Measure coronal and sagittal limb alignment, classify knee phenotypes, plan osteotomies, simulate corrections, calculate wedge sizes, and document cases with structured images, notes, scores, follow-ups, and exports. All core tools are included free. Key Features Limb Alignment Analysis Measure HKA, MPTA, LDFA, JLCA, PTS, PDFA, SJLA, and other coronal/sagittal knee alignment parameters using point-based marking, draggable landmark labels, and visual axis display. CPAK Classification Use knee alignment measurements to generate CPAK classification with type-specific visual results. Osteotomy Planning Plan and simulate HTO, DFO, and Double-Level Osteotomy. Calculate correction angles, wedge sizes, predicted alignment, and visualize correction on radiographs. Clinical Measurement Tools Dedicated workflows for knee, shoulder, hip, spine, trauma, and general orthopaedic measurements. Spine Tools Measure Cobb angle, coronal balance, sagittal vertical axis, pelvic parameters, thoracic kyphosis, and lumbar lordosis. Trauma Tools Assess common trauma angles including distal radius parameters, Böhler’s angle, Gissane’s angle, Meary’s angle, Kite’s angle, Baumann’s angle, neck-shaft angle, acetabular index, and critical shoulder angle. Structured Case Storage Store patient details, BMI, clinical scores, images, intra-operative findings, post-operative records, OT notes, and follow-ups in organized folders. OT Notes & Templates Create structured operative notes with guided templates for common orthopaedic procedures, implant details, rehabilitation protocols, and review dates. Export & Backup Export annotated images, PDFs, OT notes, or complete case folders as ZIP files. Supports cloud backup options for safer data continuity. Designed for iPhone, iPad, and Mac, with Apple Pencil support on iPad.

Screenshots

OsteoPlan4 screens

Verdict

The call

The clearest difference is update cadence: OsteoPlan at fortnightly against Perseus's every 3 months. Perseus's advantage is iOS requirement (9.3 vs 17). On price, 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Perseus ships an update every 3 months, OsteoPlan fortnightly. The most recent releases landed on September 20, 2026 and September 24, 2026 respectively.

Scorecard2 real differences · 4 level
Perseus versus OsteoPlan: the parameters behind the verdict, then further details
ParameterPerseusOsteoPlan
PriceFreeFree
Update frequencyEvery 3 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
DevicesiPadiPhone, iPad — better
Requires iOS9.3 — better17
Further details — not scored
Size71 MB7 MB
Age rating17+12+
DeveloperOrthokey Italia s.r.l.Aravind Ravichandran

In-app purchases

None

Perseus

No in-app purchases

None

OsteoPlan

No in-app purchases

Questions

Is Perseus free?
Perseus is free to download, with no in-app purchases.
Is OsteoPlan free?
OsteoPlan is free to download, with no in-app purchases.
Do Perseus or OsteoPlan have ads?
Neither Perseus nor OsteoPlan shows ads.
Which is updated more often, Perseus or OsteoPlan?
Perseus ships an update every 3 months, and OsteoPlan fortnightly. Most recently, Perseus was updated on September 20, 2026 and OsteoPlan on September 24, 2026.

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