Frequency Counter+ Hz FFT

Pitch Hz Spectrum Analyzer

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

Real-time audio frequency meter. FFT detects Hz and shows musical note. Built for musicians, sound engineers, instrument and gear testing. Frequency Counter+ precisely measures the dominant frequency of any sound in Hz using your iPhone's microphone. Detect electrical hum (50/60Hz), measure fan RPM from sound, and analyze resonant frequencies. A digital multimeter-style display shows the frequency in large, clear numbers with instant Hz-to-RPM conversion. Key Features: - Precise Hz frequency measurement - Large digital multimeter-style display - Automatic 50/60Hz electrical hum detection - Instant Hz to RPM conversion - Musical note reference display - Measurement history and trend graph - Adjustable measurement sensitivity Perfect for electricians, HVAC technicians, audio engineers, and industrial diagnostics.

Ratings & Reviews

  • 3.7
    out of 5
    3 Ratings

- Performance and stability improvements - Updated ad personalization handling for EEA users

Version 1.0.8

The developer, Kyu-Hee Jang, 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 Used to Track You

    The following data may be used to track you across apps and websites owned by other companies:

    • Identifiers
    • Usage Data

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Identifiers
    • Usage Data
    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • Kyu-Hee Jang
Size
  • 40.2 MB
Category
  • Utilities
Compatibility
Requires iOS 15.1 or later.
  • iPhone
    Requires iOS 15.1 or later.
  • iPod touch
    Requires iOS 15.1 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English
Age Rating
18+
Copyright
  • © Copyright 2026 Simon Jang. All rights reserved.
  • Developer Website
  • Privacy Policy

    • More by Kyu-Hee Jang