This release improves measurement interpretation and documentation: • IEEE 1789 results now distinguish PASS, FAIL and Can't confirm when capture coverage or framing cannot support a pass. • Calibration choices now match the companion website, including 144 Hz, 165 Hz and 240 Hz displays. • User guidance and reports now explain the camera method's 60/120 Hz depth limitations and the scope of PstLM results more precisely. • Includes reliability, privacy and report-formatting fixes.

Privacy and accuracy fixes: • GPS coordinates in reports, exports and on screen are now rounded to roughly 11 m. Six-decimal coordinates resolved to a specific address, and CSV exports published the raw value. • Percent signs now print correctly throughout PDF reports. • Measurement uncertainty is shown at a sensible precision instead of rounding down to 0.0%. • Focus is now held steady for the duration of an IEC Certified Measurement, so autofocus can no longer drift during a 3-minute capture.

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.

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.

IEC Certified Measurement (Pro): FlickerSpec now produces a Short-Term Flicker Severity (PstLM) value per IEC TR 61547-1:2015 — the metric cited by EU Ecodesign 2019/2020, ANSI C82.77-6-2023, and WELL Building Standard V2. Mount your iPhone on a tripod, aim at the fixture, run a 3-minute capture, and FlickerSpec returns a PstLM value with a clear PASS/FAIL against the PstLM ≤ 1.0 threshold. The PstLM result appears on the Log Measurement screen and in the single-measurement PDF report, alongside the existing IEEE 1789-2015 verdict. Quick Measurement (the live handheld IEEE 1789 flow) continues unchanged. Under the hood: 8× oversampled flickermeter at 1920 Hz, full 6-biquad LM weighting filter cascade, 60-second settling discard, IEC-smoothed percentile bank, validated against all 5 IEC TR 61547-1 Annex A Table A.1 test vectors within ±5%.

- Free tier now includes 5 measurements per day with daily reset - All raw metrics (Percent Flicker, Flicker Index, frequency, SNR) visible on every measurement - IEEE 1789-2015 compliance verdict now a Pro feature - Updated user manual with Settings and Pro upgrade screenshots - Improved error handling for GPS, camera, and storage failures