Comtrade Viewer Release History

Major features and enhancements for iOS and Android.

Latest Release

iOS 2.4.9 / Android 3.4.9
October 2026
  • Fixed issue when opening ATP/EMTP PL4 files containing TACS outputs. The TACS channels would be ignored. TACS channels now appear as t: channels and display properly.

2026 Releases

iOS 2.4.7 / Android 3.4.7
October 2026
  • New FAULT button displays relay-reported fault location and information and can estimate fault location using various single-ended methods (described in Help).
  • Now calculates incremental terminal signals when a terminal is defined (ΔV and ΔI).
  • Added support for iPhone Duo.
iOS 2.4.4 / Android 3.4.4
October 2026
  • New cursor readout modes: switch the A/B cursor readouts from instantaneous values to RMS, fundamental phasor (magnitude and angle), harmonic, or THD.
  • Frequency can be measured from the waveform itself, with an optional frequency lane on the plot that also shows its rate of change.
  • The R-X diagram can show primary or secondary ohms, using CT and VT ratios taken from the record or entered in Define Terminal.
  • New Amplitude range and shared lane scales options, with the axis limits shown on every lane.
  • SEL: V1MEM compensation option for raw event reports, so the memory-voltage phasor can be compared properly.
  • More display options, including five text sizes, lane label choices, and automatic handling of no-signal and DC channels.
  • Many smaller UI improvements and fixes.
iOS 2.2.5 / Android 3.2.5
September 2026
  • Added an incremental quantity based double-ended fault locator, using the method described in this paper by Kasztenny and Smelich.
iOS 2.2.3 / Android 3.2.3
June 19, 2026
  • Added support for opening ZIP files containing multiple records of any supported type.
  • Users can browse the contents of the archive and select the specific record to view.
  • Makes it easy to bundle related event records into a single compressed file for sharing through Mail, Gmail, Files, Drive, AirDrop, or local storage.
iOS 2.2.2 / Android 3.2.2
June 5, 2026
  • Added support for SEL event records (.cev, .eve, .evzip).
  • Added SEL Motor Start Reports (.msr, .cmsr).
  • Added Beckwith M-3425A, M-3430, and M-3311A OSC records.
  • Added S&C IntelliRupter waveform capture files (.wfc).
  • Added ATP/EMTP PL4 support.
iOS 2.1.1 / Android 3.2.1
May 24-25, 2026
  • Fixed SEL-735 compatibility issues.
  • Added direct links to online Help.
  • Android: Fixed gesture navigation issue.
iOS 2.1.0 / Android 3.2.0
May 19, 2026
  • Added phasor diagrams.
  • Added symmetrical components calculations.
  • Added R-X impedance plane plotting of loop impedances.
iOS 2.0.0 / Android 3.0.0
May 11-12, 2026
  • Major modernization of both applications.
  • Direct file imports from mail, cloud storage, and local files.
  • Support for COMTRADE, CFF, Beckwith OSC, and ATP/EMTP PL4 formats.
  • Bundled sample records.
  • Improved plotting, cursor functions, and user interface.

Earlier Releases

The original iOS releases (2019) introduced COMTRADE support, binary COMTRADE support, chart management improvements, and fundamental-frequency phasor displays. Android was first released in September 2019.

Questions, bug reports, and feature suggestions: feedback@comtradeviewer.org