FlickerSpec: LED Flicker Test

Audit, Compliance & Eye Strain

Only for iPhone

Free · In-App Purchases

iPhone

Your new LEDs shouldn't be giving you headaches. If they are, the lights are almost certainly flickering — faster than your eyes can consciously detect, but fast enough to trigger migraines, eye strain, and fatigue. FlickerSpec turns your iPhone into a flicker meter, using the 240fps camera to measure exactly what your eyes can't. For compliance documentation — clinical engineering, facility management, EU Ecodesign certification — FlickerSpec generates PDF reports with IEEE 1789 and IEC PstLM verdicts that satisfy accreditation surveyors and lighting auditors. WHAT YOU MEASURE Quick Measurement (Free) Live 240fps capture with real-time results: • Dominant flicker frequency in Hz • Percent Flicker and Flicker Index per IEEE 1789-2015 • Signal-to-noise ratio and confidence rating • IEEE 1789-2015 Pass/Fail verdict • Live luminance waveform and FFT spectrum IEC Certified Measurement (Pro) 3-minute tripod capture for compliance documentation: • Short-Term Flicker Severity (PstLM) per IEC TR 61547-1:2015 • EU Ecodesign 2019/2020 PASS/FAIL (threshold: PstLM ≤ 1.0) • 8× oversampled LM flickermeter validated against all 5 IEC Table A.1 test vectors • Suitable for clinical engineering and lighting audit documentation Measurement Logging & PDF Reports (Pro) Every audit, documented: • Save measurements with GPS location, fixture photo, and notes • Single-measurement and session-summary PDF reports • PstLM + EU Ecodesign section included when applicable • Calibration certificate reference on every report • CSV export for spreadsheet workflows Calibration System (Free) Verify accuracy before any audit: • Built-in calibration web app generates a known-frequency reference signal • Point your iPhone at any screen showing the calibration page • Timestamped calibration certificate attached to all subsequent reports MEASUREMENT BANDWIDTH 240fps camera capture (Nyquist: 120 Hz) measures mains-driven LED flicker reliably: • 60 Hz flicker (half-wave LED drivers, US) — full accuracy • 120 Hz flicker (full-wave rectified, US) — frequency reliable; use the 3-min IEC flow for stable depth measurements • Above 120 Hz PWM and kHz drivers — outside camera bandwidth NO SUBSCRIPTIONS $49.99 one-time purchase unlocks everything: IEEE 1789 verdicts, IEC Certified Measurement, unlimited logging, PDF reports, CSV export, calibration certificates, report header customization with your company name and logo. Free tier: full live measurement display, frequency and metrics readout, up to 5 measurements per day — enough to check any room. Privacy Policy: https://flickerspec.slick-engineering.workers.dev/privacy Terms of Use: https://flickerspec.slick-engineering.workers.dev/terms

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This update sharpens measurement accuracy: • Corrected the IEEE 1789-2015 pass/fail threshold to match the standard's published Recommended Practice, so compliance verdicts are now accurate across the full frequency range. • More precise flicker-frequency detection, with rejection of slow ambient light drift. • Steadier frame-rate estimation for more consistent readings. • Honest, clearly-labeled measurement uncertainty in reports. Custom pass/fail thresholds you set in Settings are now applied to the on-screen verdict, saved measurements, and reports.

Version 1.3.0

The developer, Corey Thomas Slick, 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.

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    Accessibility

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    Information

    Size
    • 12.3 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 26.0 or later.
    • iPhone
      Requires iOS 26.0 or later.
    • Apple Vision
      Requires visionOS 26.0 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Provider
    Corey Thomas Slick
    • Corey Thomas Slick has not identified itself as a trader for this app. If you are a consumer in the European Economic Area, consumer rights do not apply to agreements between you and the provider.
    Copyright
    • © 2026 Slick Engineering & Consulting, Inc.
  • Developer Website
  • Privacy Policy

    • More by Corey Thomas Slick

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