Comparison

Voice Spectrogram Logger vs Fractal Generator

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

Head to head
About

Voice Spectrogram Logger

Visualize voice frequencies in a spectrogram from 20-2500Hz. Adjust display with sliders and log recordings to export as PNG files. Functions fully offline and supports background processing.

Highlights
  • Real-time voice spectrogram display
  • Adjustable frequency range (20-2500Hz)
  • Zoomable spectrogram with pinch gestures
  • Customizable spectrogram gradation
  • Logging mode with history export
  • Offline functionality
Features
Read full description

1. DESPLAY The spectrogram of voice is displayed in the range of 20 - 2500Hz. You can zoom in/out the spectrogram by pinching in/out smoothly. Also landscape orientation is supported. 2. USEFUL By moving "vivid" slider, the gradation of spectrogram is controlled. The gradation is also controlled by moving "baseline" slider in "Setting" tab and selecting "Mean" or "RMS" as the way of smoothing the spectrogram out. 3. LOGGING When "log" switch is ON, this app runs in the logging mode. To choose a past log from "History" tab, you can pull it from iPhone via email as a PNG file. 4. AVAILABLE Without cellular data service, the full functions are available. The background processing is supported. 5. TECHNICAL NOTE Sample rate: 44.1kHz Bit depth: 32bit float FFT window function: Blackman FFT samples: 4096

About

Fractal Generator

Explore the beauty of mathematics by creating intricate fractals. Design them using traditional mathematical methods or a visual drag-and-drop builder. Learn, experiment, and export high-resolution images of your mathematical art.

Highlights
  • Create fractals analytically
  • Visual drag-and-drop fractal builder
  • Learn fractal mathematics
  • Experiment with transformations
  • Export high-resolution images
  • Built-in tutorial
Features
Read full description

Fractal Generator Explore the beauty of mathematics through fractals. Fractal Generator lets you create Iterated Function System (IFS) fractals using both traditional mathematical methods and a new visual, drag-and-drop builder. Whether you’re learning linear transformations, teaching fractals in the classroom, or simply experimenting with mathematical art, the app makes fractals approachable and rewarding to explore. Create Fractals Analytically • Build fractals using classic affine transformation coefficients • Enter and edit values directly • Render self-similar fractals in real time Fractals are generated from systems of equations that describe how points are transformed. These systems can be solved using substitution, elimination, or matrices, making the app a natural companion for algebra and linear algebra coursework. New in Version 2.0 — Visual Fractal Builder Design fractals visually by placing and manipulating shapes on a grid. The visual builder converts geometric transformations into the underlying mathematical coefficients automatically, allowing you to: • Experiment without starting from equations • See how transformations affect the final fractal • Better understand how IFS systems are constructed This makes fractals more intuitive, especially for visual learners. Learn, Experiment, and Explore • Recreate classic fractals included in the app • Modify existing systems or create your own • Watch a built-in tutorial explaining how the math behind fractals works Export and Share • Export high-resolution images • Optional transparent backgrounds for PNG export • Save to Photos or share your creations easily Fractal Generator Pro Unlock the full experience with a one-time Pro upgrade: • All fractal collections • Visual drag-and-drop builder • Advanced export options No subscriptions. No accounts. No tracking. If you previously purchased any fractal pack, restoring purchases automatically unlocks Pro. Designed for iPhone, iPad, and Mac Support: support@lightbulblearninglogic.com Privacy Policy: https://lightbulblearninglogic.com/privacy-policy/

Screenshots

Voice Spectrogram Logger4 screens
Fractal Generator4 screens

Verdict

The call

The clearest difference is review sentiment: Fractal Generator at 60% against Voice Spectrogram Logger's 0%. Fractal Generator also leads on rating (4.3 vs 1.0) and update cadence (every 3 months vs every 15 months). Voice Spectrogram Logger's advantage is monetization model (free vs free with in-app purchases). On price, ads, in-app purchases 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. Voice Spectrogram Logger sells 1 one-off in-app purchase and Fractal Generator sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Fractal Generator holds the better App Store score, 4.3 against 1.0. That said, the two scores are not equally well evidenced: Fractal Generator has 6 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of Voice Spectrogram Logger's written reviews are positive against 60% of Fractal Generator's.

UpkeepUpdate frequency

Voice Spectrogram Logger ships an update every 15 months, Fractal Generator every 3 months. The most recent releases landed on October 2, 2026 and September 29, 2026 respectively.

Scorecard5 real differences · 5 level
Voice Spectrogram Logger versus Fractal Generator: the parameters behind the verdict, then further details
ParameterVoice Spectrogram LoggerFractal Generator
PriceFreeFree
Rating1.0 (1 ratings)4.3 (6 ratings) — better
Positive reviews0.0% of reviews60.0% of reviews — better
Number of ratings16 — better
Update frequencyEvery 15 monthsEvery 3 months — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.5 — better16.0
Further details — not scored
Size7 MB19 MB
Age rating12+4+
DeveloperYukiko IwaiRussell Thorman

Customer experience

Voice Spectrogram Logger

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Fractal Generator

All ratings6 ratings
Positive83.3%
Neutral0.0%
Negative16.7%
Written reviews5 reviews
Positive60.0%
Neutral0.0%
Negative40.0%

In-app purchases

1 purchases

Voice Spectrogram Logger

One-time1
  • Remove Ads$3.99
5 purchases

Fractal Generator

One-time5
  • Leaf Collection$0.99
  • Snowflake Collection$0.99
  • Arrow Collection$0.99
Show 2 more
  • Spiral Collection$0.99
  • Fractal Generator Pro$2.99

Questions

Is Voice Spectrogram Logger free?
Voice Spectrogram Logger is free to download, with in-app purchases available.
Is Fractal Generator free?
Fractal Generator is free to download, with in-app purchases available.
Which has better reviews, Voice Spectrogram Logger or Fractal Generator?
Fractal Generator is rated higher. Voice Spectrogram Logger averages 1.0 out of 5 from 1 ratings, while Fractal Generator averages 4.3 from 6 ratings.
Do Voice Spectrogram Logger or Fractal Generator have ads?
Neither Voice Spectrogram Logger nor Fractal Generator shows ads.
Which is updated more often, Voice Spectrogram Logger or Fractal Generator?
Voice Spectrogram Logger ships an update every 15 months, and Fractal Generator every 3 months. Most recently, Voice Spectrogram Logger was updated on October 2, 2026 and Fractal Generator on September 29, 2026.

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