Comparison

Koto Tuner vs Koto Sim

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

Head to head
About

Koto Tuner

Easily tune your 13-string koto with a simple interface and noise filtering. Visual indicators show pitch accuracy for each string, guiding you to precise tuning. Supports multiple tuning modes and adjustable A4 frequency.

Highlights
  • Noise filtering for accurate tuning
  • Visual pitch indicators
  • Calibrate piano sound
  • A4 frequency adjustment
  • 18 tuning modes
  • Precision tuning scale
Features
Read full description

[Koto Tuner] The simple user interface with noise filtering can help you tuning the 13 strings without any setting while activating the APP. When you pull the Koto string, the pitch will be shown on the panel for the individual string by indicating signal high or low. 
 [Function Description] ▪ Calibrate Piano Sound : Click on an open string then calibrate the sound with your Koto. ▪ A4 Frequency adjustment: choose 428~452 frequencies for A4 string. ▪ Total 18 kinds of tuning modes are available. ▪ The scale for precision tuning is 5 cents for every sub-bit. The blue line represents the open strings start from. The green arrow means pitch is accurate and it will turn white once the pitch difference exceeds more than a sub-bit. ▪ The complete function, will visually tell you the pitch is good or not by lighting green or white. Users can easily adjust the string by the lighting arrow shown on the scale. 
 We welcome you to feedback us for any questions, suggestions and comments regarding this APP.

About

Koto Sim

Experience the authentic sound and feel of Japan's national string instrument. This app offers realistic koto tones, customizable interfaces, and multiple play modes for musicians and enthusiasts. Record and share your creations within an immersive simulation.

Highlights
  • Authentic koto sounds
  • Customizable interface and tuning
  • Three dynamic play modes
  • Built-in recorder
  • Screen recording for sharing
  • Immersive simulation environment
Features
Read full description

Step into the serene world of the koto, Japan's national string instrument, celebrated for its delicate tones and timeless beauty. Koto Sim brings the authentic sound and feel of this iconic instrument to your fingertips, offering a realistic and inspiring platform for musicians, learners, and music enthusiasts. About the Koto The koto is a traditional Japanese string instrument with a long, elegant body and movable bridges. Typically with 13 strings (though there are variations), it produces a bright, resonant sound that is both calming and expressive. Rooted in Japanese classical music, the koto has evolved into modern genres, creating a harmonious blend of tradition and innovation. Why You’ll Love Koto Sim Authentic Koto Sounds Enjoy meticulously sampled koto tones, capturing the instrument’s bright, resonant, and expressive character. Perfect for traditional Japanese melodies or exploring modern compositions. Customizable Interface Adjust the key layout, bridge positions, and even tuning settings with advanced controls like microtone adjustments and transpose. Whether you’re performing classic koto pieces or crafting a new tuning style, Koto Sim adapts effortlessly to your creative flow. Three Dynamic Play Modes Free Play Mode: Play multiple strings to create rich, layered harmonies and flowing melodies. Single Note Mode: Focus on individual strings — ideal for mastering traditional techniques and scales. Soft Release Mode: Add a natural fade-out effect for smooth, authentic performances. Record and Share Your Music Capture your koto music effortlessly with the built-in recorder — or go one step further and record your entire screen performance to share with the world. Whether for progress tracking, social media, or artistic expression, sharing is seamless and intuitive. Immersive Simulation Screen Dive into a visually detailed, lifelike simulation environment that replicates the experience of playing a real koto. The authentic layout and animations make every note feel genuine. What Makes Koto Sim Unique? True-to-Life Sound: Every note replicates the elegant, resonant tones of a real koto, offering an authentic musical experience. Cultural Significance: Immerse yourself in the heritage of Japanese classical music while exploring modern adaptations. Elegant Design: A sleek, intuitive interface ensures a seamless experience for musicians of all levels. Creative Freedom: From traditional koto melodies to experimental microtonal fusion, Koto Sim opens the door to limitless musical expression. Download Koto Sim today and let the graceful tones of the koto inspire your music!

Screenshots

Koto Tuner4 screens
Koto Sim4 screens

Verdict

The call

The clearest difference is rating: Koto Sim at 5.0 against Koto Tuner's 3.0. Koto Sim also leads on ratings volume (4 vs 1). Koto Tuner's advantage is ads (none vs shown) and iOS requirement (10.0 vs 12.0). On price, update cadence, in-app purchases and monetization model 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. Koto Tuner sells 1 one-off in-app purchase and Koto Sim sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Koto Sim holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

UpkeepUpdate frequency

Koto Tuner ships an update every 5 weeks, Koto Sim every 4 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

Scorecard4 real differences · 6 level
Koto Tuner versus Koto Sim: the parameters behind the verdict, then further details
ParameterKoto TunerKoto Sim
PriceFreeFree
Rating3.0 (1 ratings)5.0 (4 ratings) — better
Positive reviews20.0% of reviews—
Number of ratings14 — better
Update frequencyEvery 5 weeksEvery 4 weeks — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.0 — better12.0
Further details — not scored
Size49 MB125 MB
Age rating4+4+
DeveloperHsing-Fu HsuehAlper Kahriman

Customer experience

Koto Tuner

All ratings1 ratings
Positive0.0%
Neutral100.0%
Negative0.0%
Written reviews5 reviews
Positive20.0%
Neutral20.0%
Negative60.0%

Koto Sim

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Koto Tuner

One-time1
  • All Function&No Ad$1.99
1 purchases

Koto Sim

One-time1
  • Get Premium$8.99

Questions

Is Koto Tuner free?
Koto Tuner is free to download, with in-app purchases available.
Is Koto Sim free?
Koto Sim is free to download, with in-app purchases available.
Which has better reviews, Koto Tuner or Koto Sim?
Koto Sim is rated higher. Koto Tuner averages 3.0 out of 5 from 1 ratings, while Koto Sim averages 5.0 from 4 ratings.
Do Koto Tuner or Koto Sim have ads?
Koto Sim shows ads; Koto Tuner does not.
Which is updated more often, Koto Tuner or Koto Sim?
Koto Tuner ships an update every 5 weeks, and Koto Sim every 4 weeks. Most recently, Koto Tuner was updated on November 3, 2026 and Koto Sim on October 30, 2026.

Other comparisons