Comparison

TB Spectrogram vs Book Whisperer

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

Head to head
About

TB Spectrogram

This app provides real-time audio analysis with a spectrogram, spectrum analyzer, and goniometer. It can be used as a standalone application or as an AUv3 plugin within compatible music production hosts. Visualize your audio in detail with adjustable settings and multiple display options.

Highlights
  • Real-time spectrogram and spectrum analysis
  • Goniometer for stereo signal analysis
  • AUv3 plugin compatibility
  • Adjustable frequency and time resolution
  • Customizable color themes
  • On-screen piano keyboard mapping
Features
Read full description

ToneBoosters Spectrogram shows a real-time spectrogram, spectrum, and goniometer AUv3 plugin! We have taken the stunning visual spectrum analyzer features from our latest and greatest Equalizer Pro plugin and released it as a separate app / AUv3 plugin! The ToneBoosters Spectrogram app captures the microphone input and processes the signals in real time. To use it as a plug-in, use an AUv3-compatible host app such as Steinberg Cubasis, Apple Garageband, Audio Evolution Mobile Studio, Auria, AUM, or others. ToneBoosters Spectrogram will appear in the list of Audio Unit extensions for effect plug-ins. Key features: - Fully resizable (as AUv3 plugin) - Color themes for the user interface - Max screen support in Garageband - Adjustable color themes for UI and for spectrogram independently - Adjustable dynamic range - Adjustable frequency resolution - Adjustable time resolution - Adjustable spectral slope - Spectrogram AGC and dimming support - Show spectrogram and spectrum analyzer as overlay or individually - Spectrum analyzer also supports peak hold - Split-band goniometer for stereo signal analysis (correlation, left/right balance in one or two bands!) - On-screen piano keyboard to map spectrum analyzer to piano notes - Optimised for iPad and compatible with iPhone and iPod Touch What you should know: - Licenses acquired for this platform are not compatible with other platforms. - Audio Unit (AUv3) extensions require an iPad mini 2, iPad 4 or later models.

About

Book Whisperer

Features
Read full description

Audio player for audiobooks, lectures and other long audio Straightforward - single screen with many cool ways to rewind and seek Simple bookmarks No account, no subscriptions, no cloud, no AI features Quick use and simple design. Great for reading before sleep or during jogging. Great for playing very long tapes... I mean audio files. 3h lecture, 20h long audiobook - no problem, you can still navigate easily. As minimalistic as you like. Most audio-players use very small fonts with fancy shadows and gradients, so I need to wear my glasses (e.g.: to read current time). Come on, not having to use glasses while reading in bed is the main advantage of audiobooks

Screenshots

TB Spectrogram2 screens
Book Whisperer4 screens

Verdict

The call

The clearest difference is update cadence: Book Whisperer at weekly against TB Spectrogram's every 3 weeks. TB Spectrogram's advantage is iOS requirement (13.0 vs 15.6). 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

TB Spectrogram ships an update every 3 weeks, Book Whisperer weekly. The most recent releases landed on November 3, 2026 and October 28, 2026 respectively.

Scorecard2 real differences · 8 level
TB Spectrogram versus Book Whisperer: the parameters behind the verdict, then further details
ParameterTB SpectrogramBook Whisperer
PriceFreeFree
Rating4.4 (50 ratings) — better—
Positive reviews71.0% of reviews—
Number of ratings50 — better—
Update frequencyEvery 3 weeksWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.6
Further details — not scored
Size15 MB3 MB
Age rating4+4+
DeveloperToneBoostersKonrad Leszczyski

In-app purchases

None

TB Spectrogram

No in-app purchases

None

Book Whisperer

No in-app purchases

Questions

Is TB Spectrogram free?
TB Spectrogram is free to download, with no in-app purchases.
Is Book Whisperer free?
Book Whisperer is free to download, with no in-app purchases.
Do TB Spectrogram or Book Whisperer have ads?
Neither TB Spectrogram nor Book Whisperer shows ads.
Which is updated more often, TB Spectrogram or Book Whisperer?
TB Spectrogram ships an update every 3 weeks, and Book Whisperer weekly. Most recently, TB Spectrogram was updated on November 3, 2026 and Book Whisperer on October 28, 2026.

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