Comparison

iDousyn vs Viola Tuner Professional

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

Head to head
About

iDousyn

This app transforms your device into a professional music production tool. It features a sample-based synthesizer with dual-layer sampling, advanced filters, and a professional effects chain. Create immersive sounds and build captivating tracks with an intuitive interface and extensive sound library.

Highlights
  • Dual-layer sampling
  • Advanced filters and EQ
  • Professional effects chain
  • Creative chord pads
  • MIDI mastery
  • Expansive sound library
Features
Read full description

iDousyn transforms your iPhone and iPad into a premium sampler, synthesizer, and AUv3 plugin built for professional music production, beat making, and sound design. Powered by a massive dual-layer rompler engine, it delivers a touch-optimized workflow to create studio-quality music anywhere. Seamlessly integrating as a high-performance AUv3 Audio Unit, iDousyn is the perfect companion for Logic Pro for iPad, GarageBand, Cubasis, AUM, Loopy Pro, and other leading iOS DAWs. Whether you are producing EDM, making hip hop beats, scoring cinematic soundtracks, or designing ambient soundscapes, iDousyn gives you the ultimate sonic palette. Chord Sequencer & Harmony Engine • Ultimate Inspiration: Instantly browse, audition, and map over 432 chord variations and 100 global musical scales directly to your pads—no advanced music theory required. • Timeline Sequencer: Drag and drop your custom chords into the new visual timeline. Program rests, set loop lengths, and let the zero-latency lookahead scheduler play your progressions with perfect tempo synchronization. • Dynamic Performance: 10 customizable Chord Pads featuring intelligent strumming, dual MIDI keyboards, and assignable key ranges with real-time Neon Glow visual feedback. Dual-Layer Synthesis & DSP Effects • True Dual-Layer Rompler: Stack and blend two independent sample oscillators. Fine-tune with octave, semitone, cents, pan, and level controls for massive, evolving textures. • Studio-Grade FX Chain: Shape your tone with multi-mode filters, a parametric EQ, and fully automatable AUv3 effects including Reverb, Delay, Chorus, Flanger, Phaser, Compressor, and Limiter. Massive Sound Library & iCloud Sync • 1,100+ Premium Samples: An expansive built-in soundbank featuring heavy basses, lush synth pads, sharp leads, drum kits, acoustic guitars, and orchestral strings. • Smart Presets: Create unlimited custom patches. Your library is safely backed up with automatic, silent background iCloud Drive synchronization across all your Apple devices. Pro Recording & Export • Lossless Audio & MIDI: Record your live sessions directly within the app and export high-fidelity FLAC, WAV, AIFF, CAF, or M4A audio files, as well as full MIDI sequences. • AudioShare Integration: Instantly route your bounces to your favorite audio editors. • Background Audio: Keep your sequences running and your MIDI controllers active even while switching between apps. Designed for modern producers, beat makers, live performers, and synth enthusiasts, iDousyn brings desktop-class virtual instruments right to your fingertips.

About

Viola Tuner Professional

This application provides precise and easy viola tuning with instant loading and high responsiveness. It features an intuitive interface with visual indicators and offers advanced settings and a tuning fork as in-app purchases. Suitable for musicians of all skill levels.

Highlights
  • Precise frequency display in Hz
  • Multiple calibration options for A string
  • Instant loading and fast tuning
  • Intuitive UI with LED indicator
  • Visual indicators for tuned strings
  • Advanced settings and tuning fork (in-app purchase)
Features
Read full description

Tune your viola instantly with precision and ease! Optimal for beginners, intermediate and advanced musicians! · The most accurate - displays the exact sound frequency in Hz. · Calibration for A: 392Hz, 415Hz, 432Hz, 440Hz, 441Hz, 442Hz, 443Hz, 444Hz, 466Hz. · Instant load and fastest tuning! - Optimized for latest devices. · Highest responsiveness and sensitivity. · Intuitive user interface with LED tuning indicator. · Visual indicators - tuned string lights up. · Universal app - works with iPhone, iPad and iPod touch. · Advanced settings (A4 calibration, Mic sensitivity, Sound notifications) and Tuning fork! (as in-app purchases) What our users say: "Does what it promises - Very useful app." "This app makes tuning so easy!" "By far the greatest and most accurate viola tuning app. Play the string, read its chart and you know whether you're in tune." "Amazing! Outstanding, well spent money! "All violists should have this app!" "It's very useful for me! Thank you!" "Excellent app" "Very convenient software. Suitable for any skill!" --- Please make sure to allow microphone access to this app when prompted. Check it under Settings>Privacy>Microphone. Thank you. --- Got ideas? Questions? Please send us your feedback through our site or to feedback@daikyoujulabs.com

Screenshots

iDousyn4 screens
Viola Tuner Professional4 screens

Verdict

The call

The clearest difference is price: iDousyn at $5.99 against Viola Tuner Professional's $12.99. iDousyn also leads on rating (4.2 vs 3.9) and ratings volume (161 vs 9). Viola Tuner Professional's advantage is iOS requirement (15.6 vs 26.0). On update cadence, 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

iDousyn costs $5.99 and Viola Tuner Professional $12.99 up front. iDousyn sells 1 one-off in-app purchase and Viola Tuner Professional sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

iDousyn holds the better App Store score, 4.2 against 3.9. That said, the two scores are not equally well evidenced: iDousyn has 161 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 34% of iDousyn's written reviews are positive against 22% of Viola Tuner Professional's.

UpkeepUpdate frequency

iDousyn ships an update every 2 months, Viola Tuner Professional every 4 months. Both last shipped on October 29, 2026.

Scorecard6 real differences · 4 level
iDousyn versus Viola Tuner Professional: the parameters behind the verdict, then further details
ParameteriDousynViola Tuner Professional
Price$5.99 — better$12.99
Rating4.2 (161 ratings) — better3.9 (9 ratings)
Positive reviews34.1% of reviews — better22.2% of reviews
Number of ratings161 — better9
Update frequencyEvery 2 months — betterEvery 4 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS26.015.6 — better
Further details — not scored
Size1.2 GB7 MB
Age rating4+4+
DeveloperJorge LozadaPedro Daniel Macalupu Cumpen

Customer experience

iDousyn

All ratings159 ratings
Positive78.6%
Neutral2.5%
Negative18.9%
Written reviews44 reviews
Positive34.1%
Neutral6.8%
Negative59.1%

Viola Tuner Professional

All ratings9 ratings
Positive66.7%
Neutral22.2%
Negative11.1%
Written reviews9 reviews
Positive22.2%
Neutral0.0%
Negative77.8%

Bugs and requests

iDousyn

Reported bugs

15 issues
  • App crashes immediately
  • Full version displays full-page ads
  • Ads appear on the front page
  • New update has ads
  • Implemented trackers
Show 10 more
  • iDousyn Lite works, this one does not
  • App does not open
  • MIDI input timing issues
  • Sound crash sometimes
  • Long delay between external MIDI and sound
  • Sluggish keyboard
  • Sluggish interface
  • Glide is always on
  • Scrolling menu is hard to use
  • Sliders on scrolling menu

Requested features

10 requests
  • Adaptive Crasher (AUV3, Adaptive Cubasis and Zenbeats)
  • AUV3 support
  • Audiobus compatibility
  • MIDI IN for better keyboard control
  • Background audio option
Show 5 more
  • Reset button
  • Fix sound crash
  • Improve interface contrast
  • Make panel brighter
  • Allow turning off glide

Viola Tuner Professional

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

iDousyn

One-time1
  • Unlock ProFree
2 purchases

Viola Tuner Professional

One-time2
  • SettingsFree
  • Tuning ForkFree

Questions

Is iDousyn free?
iDousyn costs $5.99, and also offers in-app purchases.
Is Viola Tuner Professional free?
Viola Tuner Professional costs $12.99, and also offers in-app purchases.
Which has better reviews, iDousyn or Viola Tuner Professional?
iDousyn is rated higher. iDousyn averages 4.2 out of 5 from 161 ratings, while Viola Tuner Professional averages 3.9 from 9 ratings.
Do iDousyn or Viola Tuner Professional have ads?
Neither iDousyn nor Viola Tuner Professional shows ads.
Which is updated more often, iDousyn or Viola Tuner Professional?
iDousyn ships an update every 2 months, and Viola Tuner Professional every 4 months. Most recently, iDousyn was updated on October 29, 2026 and Viola Tuner Professional on October 29, 2026.

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