Comparison

VoicePrinter vs SLS Exercises

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

Head to head
About

VoicePrinter

Analyze sound and voice in real-time with detailed visual representations. Explore human voices, environmental sounds, music, and more. Offers recording, playback, and import/export features with a premium upgrade.

Highlights
  • Real-time sound visualization
  • Human voice analysis
  • Environmental sound analysis
  • Music analysis
  • Recording and playback
  • Import/export audio files
Features
Read full description

Sound is decomposed into two dimensions and displayed continuously over time. The premium version offers a new style of audio recorder/player. This app can be used for analysis of Human voice, Environmental sound, Sound of animals, musics, etc. The specifications are as follows. Sampling rate = 10000 to 44100 Hz Display maximum frequency = 1000 to 22050 Hz Display time range = 2 to 10 seconds Frequency axis display resolution = 100 Time axis display resolution = 10 / sec From version 1.1, recording, playback, import, and export functions based on sound and voiceprints can be used by in-app purchase. In this case, banners will not be displayed. The premium version allows recording, playback, import of external sound source files, and external output. ・Record under the following conditions Sampling frequency = 10000~44100Hz ・Display audio analysis results under the following conditions (audio is played in sync with the analysis screen) Maximum display frequency (high-pitched display frequency limit) = 1000~22050Hz (half the sampling frequency or less) Display time range (time that can be displayed on one screen) = 2~10 seconds Frequency display resolution (frequency axis: number of data displayed on the vertical axis) = 200 points Time axis display resolution (time axis: display interval (pitch) on the horizontal axis) = 50~200ms (10~200 points) ・Importing external audio source files Imports 16-bit linear PCM mono audio sources. (In the case of stereo, only 1ch is imported.) ・External output Outputs as 16-bit linear PCM mono. *To input and output data to iCloud Drive, you must enable iCloud Drive in System Preferences. *******

About

SLS Exercises

Features
Read full description

Speech Level Singing Exercises is a voice training tool for singers with various vocal exercises. It has below exercises that are commonly used in Speech Level Singing. - Five Tone Scale - Descending Arpeggio - Descending Octave Repeat - Octave Repeat - Octave More Repeat - Octave Broken - One Half Scale - One Half Scale With Gallop - One Half Scale in Triplets The exercises are grouped by vocal bridges; - Female First Bridge A4 Bb4 B4 C5 C#5 - Female Second Bridge E5 F5 F#5 - Female Full Range - Male First Bridge E4 F4 F#4 - Male Second Bridge A4 Bb4 B4 C5 C#5 - Male Full Range The exercises for the bridges are around the specific bridge areas. In full range sections the exercises cover F3 to F6 for female voices and E2 to F5 for male voices. Exercise ranges can be adjusted within the range of the current bridge. All exercises can be played at any tempo between 40 and 270 (for fast riffs and runs) bpm. Exercises can be bookmarked for quicker reference. The playing note of the scale is shown as text and bridge notes are colored. Colored bridge notes can be turned on and off in the settings.

Screenshots

VoicePrinter4 screens
SLS Exercises4 screens

Verdict

The call

The clearest difference is price: VoicePrinter at Free against SLS Exercises's $4.99. SLS Exercises's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support and iOS requirement 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

VoicePrinter is free to download; SLS Exercises costs $4.99 up front. VoicePrinter sells 1 one-off in-app purchase. SLS Exercises asks for nothing beyond the download.

UpkeepUpdate frequency

VoicePrinter ships an update every 47 months, SLS Exercises every 6 months. The most recent releases landed on October 3, 2026 and September 29, 2026 respectively.

Scorecard4 real differences · 5 level
VoicePrinter versus SLS Exercises: the parameters behind the verdict, then further details
ParameterVoicePrinterSLS Exercises
PriceFree — better$4.99
Rating4.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 47 monthsEvery 6 months — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.0 — better16
Further details — not scored
Size5 MB3 MB
Age rating4+9+
DeveloperHIROFUMI MARUOAltug Basaran

In-app purchases

1 purchases

VoicePrinter

One-time1
  • Premium Functions$0.99
None

SLS Exercises

No in-app purchases

Questions

Is VoicePrinter free?
VoicePrinter is free to download, with in-app purchases available.
Is SLS Exercises free?
SLS Exercises costs $4.99, with no in-app purchases.
Do VoicePrinter or SLS Exercises have ads?
VoicePrinter shows ads; SLS Exercises does not.
Which is updated more often, VoicePrinter or SLS Exercises?
VoicePrinter ships an update every 47 months, and SLS Exercises every 6 months. Most recently, VoicePrinter was updated on October 3, 2026 and SLS Exercises on September 29, 2026.

Other comparisons