Simple Signal Generator

Utilities

Only for iPhone

$4.99 · Designed for iPhone. Not verified for macOS.

iPhone

A two-channel function generator on your iPhone. Sine, square, sweep, AM/FM/PM, and a live scope — for audio experiments. Description SigGen is a dual-channel function generator for iPhone. It is built like a small bench instrument: log frequency, a live oscilloscope, pads, and independent outputs for channel A and B. Use it to check amplifiers, headphones, crossovers, and wiring, or to put a known pitch on a speaker. It is a test-tone source, not a synthesizer or a music app. FREQUENCY Log slider from 0.1 Hz to 20 kHz. Decade keys, user presets (100 Hz, 440 Hz, 880 Hz, 3520 Hz, 20 kHz), ±2% trim, and a keypad for an exact value. WAVEFORMS Sine, square, triangle, saw, pulse (with duty cycle), white noise, pink noise, and fade — a sine that rings down onto the x-axis. SCOPE Live preview with a 1-2-5 time/div and AUTO. The trace is the same math as the output; it does not mean the speaker is on. CHANNELS Two oscillators. Mono copies A to both ears. Stereo A/B sends A left and B right. Phase is relative between channels in stereo. SWEEP, MOD, BURST Linear or log sweep between two frequencies. AM, FM, or PM from an internal LFO. Burst gates a set number of cycles on a timer. OUTPUT Independent OUTPUT A and OUTPUT B. Two −20 dB pads per channel. Level is digital full scale (dBFS), not volts or SPL. Phone analog output is AC-coupled, so DC offset appears on the scope only. NOTES Output stops when you leave the app, unplug headphones, or another app takes audio. Tones below about 20 Hz are generated but a phone speaker or earbuds will not reproduce them usefully. Start with device volume down; a steady test tone is louder than music at the same setting.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

Added small features: - running in background (configurable) - help / about added.

Version 1.1

The developer, Mihail Balescu, 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.

    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
    Mihail Balescu
    Size
    2.8 MB
    Category
    Utilities
    Compatibility
    Requires iOS 18.6 or later.
    • iPhone
      Requires iOS 18.6 or later.
    • Mac
      Requires macOS 15.6 or later and a Mac with Apple M1 chip or later.
    Languages
    English
    Age Rating
    4+
    Copyright
    © 2026 Simple Signal Gen Inc.
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.