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
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
FlickerSpec is now free to download.
• Refreshed icon and in-app palette designed to be comfortable for flicker-sensitive users (migraine, photophobia, light sensitivity).
• Softened all verdict and warning colors to a low-saturation amber/sage/brick palette — easier on the eyes during long audits.
• Pro tier dropped from $149.99 to $49.99 one-time.
Quick Measurement (live IEEE 1789 check) and IEC Certified Measurement (3-minute PstLM tripod capture) continue unchanged.
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.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Corey Thomas Slick
- Size
- 11.4 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.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- FlickerSpec Pro QAR 199.99
- Copyright
- © 2026 Slick Engineering & Consulting, Inc.