# FlickerSpec: LED Flicker Test

> Audit, Compliance & Eye Strain

Canonical page: [https://chrome-stats.com/d/id6759629660](https://chrome-stats.com/d/id6759629660)

## Overview

- **ID:** `id6759629660`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Corey Thomas Slick
- **Category:** Utilities
- **Version:** 1.4.0
- **Last updated:** 2026-07-28
- **First published:** 2026-04-03
- **Size:** 12 MB
- **Data as of:** 2026-09-06
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/flickerspec-led-flicker-test/id6759629660)
- **Website:** [https://flickerspec.slick-engineering.workers.dev/](https://flickerspec.slick-engineering.workers.dev/)
- **Privacy policy:** [https://flickerspec.slick-engineering.workers.dev/privacy](https://flickerspec.slick-engineering.workers.dev/privacy)

## Description

Measure LED flicker with your iPhone camera at 240 fps. Free: unlimited live readings + free calibration. Pro ($49.99 one-time): IEEE 1789 verdicts, IEC PstLM, PDF, CSV.

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, unlimited)
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
• Live luminance waveform and FFT spectrum
• No daily limit — measure as many fixtures as you like

Compliance Verdicts (Pro)
Turn raw numbers into a documented decision:
• IEEE 1789-2015 PASS/FAIL verdict against the published low-risk practice
• Custom pass/fail thresholds when your specification differs
• The standard and threshold applied are recorded with every saved measurement

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: unlimited Quick Measurements with the full live readout — frequency, percent flicker, flicker index, SNR and confidence — plus free calibration.

Privacy Policy: https://flickerspec.slick-engineering.workers.dev/privacy
Terms of Use: https://flickerspec.slick-engineering.workers.dev/terms

## Rankings

- #1,546,616 — Overall

## Similar extensions and apps

- [Flicker Meter+ Light](https://chrome-stats.com/d/id6760830317) — 1.00 / 5
- [FlickerSense](https://chrome-stats.com/d/id6758218538)
- [Flicker Meter for Light - PWM](https://chrome-stats.com/d/id1672848632) — 4.60 / 5
- [Flicker Check](https://chrome-stats.com/d/id6756520447)
- [Illuminance Pulsation Meter](https://chrome-stats.com/d/id1456605148) — 4.20 / 5
- [FlickerFinder](https://chrome-stats.com/d/id1495117202) — 1.00 / 5
- [ShutterFinder — Flicker Detect](https://chrome-stats.com/d/id6760565737) — 5.00 / 5
- [LIDA Meter](https://chrome-stats.com/d/id6760695634)
- [Flicker Light](https://chrome-stats.com/d/id1186160850) — 5.00 / 5
- [ColourTemp](https://chrome-stats.com/d/id6776435214) — 3.00 / 5
- [EyeZenith: Eye Stress Scan](https://chrome-stats.com/d/id6769673246)
- [Color Screen: LED Light](https://chrome-stats.com/d/id6762495391)

---

Source: [Chrome-Stats](https://chrome-stats.com/d/id6759629660)