Goniometer: Range of Motion

Joint Angle, ROM & Rehab

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Turn your iPhone into a goniometer — 47 movements, neck to fingertips, with guided placement. Try Pro free for 7 days: no card, no auto-charge, no subscription. Measure joint range of motion with the device already in your pocket. Goniometer turns the iPhone's motion sensor into a clinical-style goniometer: place the phone against the limb, read the live angle, and lock it when steady. Built for occupational and physical therapists, hand therapists (CHTs), chiropractors, physicians and other doctors, nurses, athletic trainers, ATPs, and students — and used by patients tracking their own range of motion and recovery at home. Reviewed against standard supine measurement technique. Smartphone inclinometer measurement has been shown valid and reliable for joint range of motion in peer-reviewed research (Keogh et al., systematic review, PLOS ONE, 2019). MEASURE IN SECONDS • Live, gravity-referenced angle with a large readable display • Flat and upright starting positions read 0° automatically — no calibration • Set Zero baseline override for patients who can't reach the standard start position • Stability indicator: lock only when the reading is steady • Optional spoken angle so both hands stay on the patient ANIMATED PLACEMENT GUIDES Every movement has a step-by-step animated guide with a clear anatomical diagram: patient position, exactly where the iPhone lies, and what the motion looks like from start to end range. 47 MOVEMENTS — NECK, UPPER AND LOWER EXTREMITY, AND EVERY FINGER Cervical spine flexion, extension, lateral flexion, and rotation · shoulder flexion, abduction, and external rotation · elbow flexion and extension · wrist flexion, extension, and radial/ulnar deviation · hip flexion and external rotation · knee flexion and extension · ankle dorsiflexion and plantarflexion. HAND & FINGER ROM Measure every finger and thumb joint — MCP, PIP, and DIP (and thumb MCP/IP), flexion and extension — with a guided two-placement technique. Patient Profiles compute Total Active Motion (TAM) per digit automatically — a standout for hand therapists (CHTs), and one more region any clinician can document in the same app. QUICK ANGLE & LEVEL — MEASURE ANY ANGLE Measure any angle with Quick Angle: wheelchair frames, splints and orthoses, ramp slopes, and seating angles. Check that footplates, seats, and trays sit even with the built-in Level. Both are free. NORMAL ROM REFERENCE A free, searchable reference of normal range values for every supported movement, with deep links to each placement guide. PATIENT PROFILES — YOUR FIRST ONE IS FREE Create a patient profile with a de-identified label, a movement checklist, and left/right sides, and record a reading for every movement. Tag readings active or passive (AROM/PROM) and add, correct, or backdate any reading. Your first profile is free, watermarked PDF and CSV export is free, and a deletable example patient lets you explore trend charts, summaries, and reports instantly. TRY PRO FREE FOR 7 DAYS Use every Pro feature for a week — no credit card, no automatic charge, nothing to cancel. The trial simply ends and everything you recorded stays saved. GONIOMETER PRO — ONE-TIME PURCHASE, NO SUBSCRIPTION • Unlimited patient profiles • Progress history with trend charts: every reading kept and graphed across visits • Goal tracking: set a target angle per movement, shown on every chart and report • Total Active Motion (TAM) per finger, computed automatically • Side-to-side comparison: each side as a percentage of the contralateral limb • Watermark-free PDF and CSV reports, with the clinical summary and progress charts included • Clinic letterhead: your clinic's name and logo on every report • Hands-free auto-lock: the angle captures itself once the limb is held steady PRIVATE BY DESIGN No accounts, no analytics, no tracking. Everything stays on your device, and the app works fully offline. Protect saved profiles with a free Face ID lock. Available in English and Spanish. Goniometer is an educational and reference tool. It is not a medical device and is not intended for diagnosis or treatment decisions.

Ratings & Reviews

  • 5.0
    out of 5
    5 Ratings

• Try Pro free for 7 days — no credit card, no automatic charge; the trial simply ends • Goal tracking: set a target angle per movement and see it on trend charts and PDF reports (Pro) • Tag any reading as active or passive (AROM/PROM) — free • Onboarding now tailors the app to you: clinician, student, or recovering at home • New installs include a deletable example patient — explore trend charts, summaries, and reports instantly • Polish and reliability improvements

Version 1.4

The developer, KEVIN LAN, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer indicated that this app supports the following accessibility features. Learn More

    • Supported Features

      • VoiceOver

      • Larger Text

      • Dark Interface

      • Sufficient Contrast

      • Reduced Motion

    Information

    Seller
    • KEVIN LAN
    Size
    • 3 MB
    Category
    • Medical
    Compatibility
    Requires iOS 16.6 or later.
    • iPhone
      Requires iOS 16.6 or later.
    • Mac
      Requires macOS 13.5 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English and Spanish
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 Kevin Lan
  • Developer Website
  • Privacy Policy

    • More by KEVIN LAN

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