SignalLab: Tone Generator

I made SignalLab without any microphone permission. It only plays: tones, noise, sweeps and speaker checks, rendered on the device and sent straight to the speaker. I wanted a test signal I could trust while the other labs did the measuring.

Pick a waveform, set a frequency or type one in hertz, and press play.

- Sine, square, triangle and dual tone (two sines, for intermodulation), plus white, pink and brown noise, 20 Hz to 20 kHz, with the musical note shown
- Levels in dBFS at -30, -20, -12, -6 and 0, and loops that run without a gap
- Four sweep presets with a 3-2-1 countdown, at -20 to -3 dBFS
- Speaker checks: left, right, both, alternate, and a polarity pulse, with plain words on what a wrong result means
- WAV export of a sweep through the share sheet

The RoomLab preset, 4 s from 20 Hz to 20 kHz, is the exact sweep RoomLab measures with, so a second phone can be the speaker. RoomLab can open SignalLab straight on that sweep from its measure screen. The slow preset takes 30 s over the same range. A phone speaker barely exists below 200 Hz and clips early, and the app says so on the screen. dBFS is the level of the signal, not dB(A) in the room.

I kept generating free: every waveform and noise type, all four sweep presets, all five speaker checks, and one WAV export per install. Pro is a one-time purchase, for when the signal has to leave the app: unlimited WAV export, a custom sweep with your own start and end (20 to 20000 Hz) and length (1 to 60 s), and a thirds ladder, 26 one-third-octave bands from 50 Hz to 16 kHz, one second each.

SignalLab is one of seven small labs by AudioLab.tools, each made to do one job well: RoomLab (room acoustics, RT60), NoiseLab (sound level meter), MicLab (mic check), LevelLab (LUFS loudness meter), SignalLab (tone generator), TuneLab (chromatic tuner) and SkillLab (ear training). They share one look, and some hand their results to each other.

No ads. No account. Nothing leaves your phone except a WAV you share yourself.
Questions or a bug: hello@audiolab.tools

Recent changes:
New: Indonesian and Italian. The saved file name now matches the one you saw.