Comparison

Tone generator vs Granula Synth

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Tone generator

Create various periodic signals with adjustable frequency and amplitude for testing electronic circuits or tuning instruments. Features include a metronome, a real-time tuner, and options for generating different noise types and tone sequences. It also offers unique features for hearing tests and party games.

Highlights
  • Generate periodic signals
  • Adjustable frequency and amplitude
  • Integrated instrument tuner
  • Metronome for practice
  • Hearing ability tests
  • Generate white/pink noise
  • Create tone sequences
Features
Read full description

Generate various periodic signals with different waveforms with adjustable frequency and amplitude. These are used to test electronic circuits such as amplifiers and filters. Also suitable for musicians to tune their instruments. As soon as a note sounds, the integrated tuner recognizes the pitch and displays the note name and deviation. For any instrument that produces an even tone. A metronome also helps you to practise. Drive insects away or compare your hearing ability with your friends and relatives and share your results! Or watch others straining their ears to find the sounds that cannot locate you. Party fun is guaranteed! optional features (Purchase): - free of Ads - manual frequency input - support app functionality for connected Bluetooth devices, e.g. speaker - different signals - white/pink noise - tuner for tuning instruments (real-time tone recognition C1-C8) with tuning whistle - metronome for a steady tempo - note/tone for frequency - Left/right channel, stereo - create a tone sequence for playing several different frequencies in particular time slot - loop for tone sequence - save and delete tone sequences - load saved tone sequences - send your tone sequence as an audio file (.caf format) - option to compress audio files Attention: If you want to share your results with others, first test your audible frequencies, then mark under the speakers your lowest audible tone and your highest audible tone (stored only temporarily). A small hint: the chart will show you what other frequencies of your age are still possible to reach.

About

Granula Synth

Explore new soundscapes by manipulating granular audio. This app offers a library of presets, custom sound import, and extensive parameter adjustments for unique music creation. Save your settings and share your sonic experiments.

Highlights
  • Granular sound manipulation
  • Preset library
  • Custom sound import
  • Parameter adjustment
  • Save user settings
  • Share audio recordings
Features
Read full description

Push the boundaries of sound design. Granula Synth turns granular synthesis into a playground — grab tiny grains of audio, scatter them across the waveform, and shape them into pads, textures, and soundscapes no other synth can make. What's inside: - Curated preset library, crafted by sound designers - Deep grain controls — length, position, direction, pitch, and more - Powerful modulation matrix with dual LFOs and chaos generators - Built-in envelope, EQ, and FX chain - Import your own audio or record directly in the app - Save, organize, and share your presets - Export your ideas straight to your DAW Whether you're scoring film, building ambient textures, or just exploring new sonic territory, Granula Synth gives you granular control over every grain of sound. Privacy Policy: https://sites.google.com/view/castles-trip-privacy-policy Terms of Use: https://sites.google.com/view/granula-tos

Screenshots

Tone generator4 screens
Granula Synth4 screens

Verdict

The call

The clearest difference is review sentiment: Tone generator at 67% against Granula Synth's 20%. Tone generator also leads on rating (4.0 vs 1.8) and update cadence (every 5 months vs every 25 months). Granula Synth's advantage is ads (none vs shown). On price, in-app purchases, monetization model and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Tone generator sells 3 one-off in-app purchases and Granula Synth sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Tone generator holds the better App Store score, 4.0 against 1.8. That said, the two scores are not equally well evidenced: Tone generator has 152 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 67% of Tone generator's written reviews are positive against 20% of Granula Synth's.

UpkeepUpdate frequency

Tone generator ships an update every 5 months, Granula Synth every 25 months. The most recent releases landed on September 17, 2026 and July 10, 2026 respectively.

Scorecard5 real differences · 5 level
Tone generator versus Granula Synth: the parameters behind the verdict, then further details
ParameterTone generatorGranula Synth
PriceFreeFree
Rating4.0 (152 ratings) — better1.8 (4 ratings)
Positive reviews67.1% of reviews — better20.0% of reviews
Number of ratings152 — better4
Update frequencyEvery 5 months — betterEvery 25 months
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.012.0
Further details — not scored
Size27 MB75 MB
Age rating4+4+
Developermichael heinzStanislav Duplinskiy

Customer experience

Tone generator

All ratings152 ratings
Positive75.7%
Neutral4.6%
Negative19.7%
Written reviews237 reviews
Positive67.1%
Neutral3.8%
Negative29.1%

Granula Synth

All ratings4 ratings
Positive25.0%
Neutral0.0%
Negative75.0%
Written reviews5 reviews
Positive20.0%
Neutral20.0%
Negative60.0%

Bugs and requests

Tone generator

Reported bugs

10 issues
  • Doesn't go lower than 10hz
  • Crashes before I can export even though I paid for the feature
  • Fake app. Buying the upgrade doesn't do anything. There is no support. You can't export like it says you can. It's a scam.
  • app is modified
  • No tone
Show 5 more
  • Frozen on my iPad
  • Doesn't produce any sound
  • No sound
  • Faulty
  • No sound

Requested features

7 requests
  • Wish I had a manual that explains a couple functions
  • More precise way to select the frequency
  • Playing of multiple tomes
  • Manually enter a frequency
  • More than one voice
Show 2 more
  • Dark mode option
  • Advanced analytics dashboard

Granula Synth

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

Tone generator

One-time3
  • Extra-Feature 1$1.99
  • No advertising$1.99
  • Upgrade to full version$3.99
3 purchases

Granula Synth

Subscriptions3
  • Access to app features3 Days trial$2.991 Month
  • Access to app features3 Days trial$7.493 Months
  • Access to app features3 Days trial$8.996 Months

Questions

Is Tone generator free?
Tone generator is free to download, with in-app purchases available.
Is Granula Synth free?
Granula Synth is free to download, with in-app purchases available.
Which has better reviews, Tone generator or Granula Synth?
Tone generator is rated higher. Tone generator averages 4.0 out of 5 from 152 ratings, while Granula Synth averages 1.8 from 4 ratings.
Do Tone generator or Granula Synth have ads?
Tone generator shows ads; Granula Synth does not.
Which is updated more often, Tone generator or Granula Synth?
Tone generator ships an update every 5 months, and Granula Synth every 25 months. Most recently, Tone generator was updated on September 17, 2026 and Granula Synth on July 10, 2026.

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