Comparison

Stringcalculator vs iPracticePro

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

Head to head
About

Stringcalculator

Calculate string properties for various instruments. Determine diameter, tension, and tone based on material, frequency, and scale length. Supports multiple units of measurement.

Highlights
  • Calculate string diameter, tension, and tone
  • Supports gut, nylgut, carbon, Tynex, and nylon strings
  • Set custom frequencies
  • Calculate in cm, mm, or inches
  • Adjustable scale length
Features
Read full description

A string calculator to calculate single strings for historical (or modern) stringed instruments. Calculates strings from gut, nylgut, carbon (PVF), Tynex and nylon. Diameter, tension, tone and scale can be calculated. You can set any frequency instead of the chamber tone a'. Calculates in cm, mm or inch.

About

iPracticePro

This app offers a comprehensive suite of tools for musicians, including a chromatic tuner, extensive chord library, and customizable metronome. Practice scales, intervals, and complex chord progressions with adjustable tempos and time signatures. Explore fingering charts and reed adjustment information for wind instruments.

Highlights
  • Chromatic tuner with adjustable frequencies
  • Extensive chord library with over 45 types
  • Customizable metronome with adjustable BPM and time signatures
  • Chord progression practice with over 50 progressions
  • Pad for creating custom intervals and chords
  • Saxophone fingering charts and reed adjustment info
Features
Read full description

•Drones• The first part of the app allows you to play all chromatic notes in tunings from 432Hz to 444Hz in many different sounds. The notes sound continuously and it´s a perfect way to practice intervals, chords and scales. You also have the possibility to play the notes randomly in an adjustable period of time. The app supports quarter tones if you´ve chosen expert mode. Sounds: organ, piano, electric piano, strings, guitar, double bass, bassoon, clarinet, oboe, flute and sine •Chords• The chord section contains 5 chords in standard mode more than 45 chords in expert mode. The metronome allows you to practice in tempos from 30bpm up to 300bpm. It can be set to different time signatures like 2/4, 3/4, 4/4, 5/4, 7/4, 9/4, 11/4, 13/4. You can also select or deselect the downbeats and offbeats separately. You can listen and play to all chords in all twelve keys, see which notes are the chord notes and scale notes and read information about the chord and the corresponding scale. In addition to that, all chords can also be played randomly. You can choose to just randomly change the root or the root and the chord type. The app lets you filter the chords, which allows you to only randomly play the chords of for example the modes of melodic minor or harmonic minor. 45+ Chords: ▵7, 7, -7, ø7, o7, 5 69, ▵7#11, ▵7#5, ▵7#5(11), ▵7#9, ▵7#9b13 7sus4, 7susb9, 7#11, 7#5, 7b913, 7b9b13, 7b13, 7alt -6, -▵7, -▵7b13, -7b13, -7b9, -7#11, -∆7#11, phryg, ø713, o7b2b11 major, major/3, major/5, major/b9, major/9, major/b3, major/11, major/#11, major/b13, major/13, major/7, major/▵7 minor, minor/b3, minor/5 augmented, diminished Sounds: electric piano, piano, organ and strings •Progressions• In this section you can practice more than 50 chord progressions in all twelve keys. The metronome, with all its setting options, is also included in this section. The volume of the root note, third and septime or rather the tensions is adjustable. If you press one of the two random buttons, the app picks a random root or a random progression and root. 50+ progressions: II-7 V7 I▵7, II-7 V7alt I▵7, II-7 bII7#11 I▵7, II-7 V7b913 I▵7, II-7 V7b9b13 I▵7, II-7 V7susb9 I▵7 IIø7 V7 I-, Coltrane Changes and so on…see full list on my website. Sounds: electric piano, piano, organ and strings •Pad• Using the pad you can put together your own intervals and chords. You have four octaves and five sounds to choose from, with which you can select up to five tones. The tones can sound both simultaneously and one after the other. The metronome, with all its setting options, is also included in this section. You can choose out of these sounds: electric piano, piano, organ, strings and sine •Fingerings for saxophone and reed adjustment for saxophone and clarinet• There are fingering charts about standard fingerings, false fingerings, altissimo and quarter tones and information about reed adjustment of sides, table, tip, shoulder and heart. If you don´t play the saxophone, you can hide this part of the app. •Features• * Stealth Mode (Ear Training Mode). You can use stealth mode in drones, chords and progressions. This will hide the currently played chords and display them afterwards. * A practice timer that informs you when your set practice time has expired. * Landscape mode. * Light- and dark appearance (Night Shift). * You can set if you play a C, Bb, oder Eb Instrument. * Are you an advanced player? The expert mode offers you additional information which could be confusing to unexperienced musicians. If you have no idea what C▵7#5 means or if you have never heard of quarter tones you probably should choose the standard mode. * All sounds can be played from 432Hz to 444Hz.

Screenshots

Stringcalculator1 screens
iPracticePro4 screens

Verdict

The call

The clearest difference is update cadence: iPracticePro at monthly against Stringcalculator's every 16 months. iPracticePro also leads on iOS requirement (15.6 vs 17.6). Stringcalculator's advantage is price ($2.99 vs $5.99) and review sentiment (100% vs 87%). On 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

Stringcalculator costs $2.99 and iPracticePro $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Stringcalculator ships an update every 16 months, iPracticePro monthly. The most recent releases landed on September 30, 2026 and October 13, 2026 respectively.

Scorecard5 real differences · 5 level
Stringcalculator versus iPracticePro: the parameters behind the verdict, then further details
ParameterStringcalculatoriPracticePro
Price$2.99 — better$5.99
Rating—4.7 (239 ratings) — better
Positive reviews100.0% of reviews — better86.8% of reviews
Number of ratings—239 — better
Update frequencyEvery 16 monthsMonthly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.615.6 — better
Further details — not scored
Size1 MB170 MB
Age rating4+4+
DeveloperMartin UhligSteffen Weber

Customer experience

Stringcalculator

Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

iPracticePro

All ratings239 ratings
Positive95.4%
Neutral2.9%
Negative1.7%
Written reviews53 reviews
Positive86.8%
Neutral7.5%
Negative5.7%

Bugs and requests

Stringcalculator

Not enough reviews yet to summarise bugs or requests.

iPracticePro

Reported bugs

2 issues
  • App closes on its own after about 30 seconds
  • Cannot limit roots and progression at the same time

Requested features

10 requests
  • Display notes of a chord when improvising
  • Ability to create own chord progressions
  • Random tempo oscillation with tweakable parameters
  • Add sax voices
  • Cover more than an octave
Show 5 more
  • Add a metronome for drones
  • Keep audio playing in the background
  • Progress tracking with gamification
  • Drones cycle down the scale
  • Drone scale made of selected notes

In-app purchases

None

Stringcalculator

No in-app purchases

None

iPracticePro

No in-app purchases

Questions

Is Stringcalculator free?
Stringcalculator costs $2.99, with no in-app purchases.
Is iPracticePro free?
iPracticePro costs $5.99, with no in-app purchases.
Do Stringcalculator or iPracticePro have ads?
Neither Stringcalculator nor iPracticePro shows ads.
Which is updated more often, Stringcalculator or iPracticePro?
Stringcalculator ships an update every 16 months, and iPracticePro monthly. Most recently, Stringcalculator was updated on September 30, 2026 and iPracticePro on October 13, 2026.

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