Comparison

Violin Tuner vs 15s War

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

Head to head
About

Violin Tuner

This application provides accurate tuning notes for the violin, covering the standard G, D, A, and E strings. It's a straightforward tool designed to help musicians achieve precise intonation for their instrument.

Highlights
  • Plays G tuning note
  • Plays D tuning note
  • Plays A tuning note
  • Plays E tuning note
  • Simple interface
Features
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Plays tuning notes for the violin (G D A E).

About

15s War

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15s War: Impulse Control Assistant [Headline] Win the 15-second war for your mind. [Description] In an era where digital algorithms are designed to hack your impulses, the most valuable asset you possess is your Free Will. 15s War is a cognitive intervention tool designed for those who navigate high-stakes environments—investors, traders, and high-performing individuals. Based on the principles of "Emotionics" (Affective Computing), this app provides a critical 15-second window to pause, breathe, and regain control before acting on a sudden urge. Whether it’s a risky trade in the options market, a habit you are trying to break, or a reactive decision in daily life, 15 seconds is all it takes to shift from your impulsive "fast brain" to your rational "slow brain". [Key Features] The 15-Second Circuit Breaker: A minimalist interface designed for the Apple Watch, allowing you to trigger a countdown the moment you feel an impulse. Haptic Guidance: Subtle vibrations keep you grounded in the "here and now," preventing your mind from spiraling into reactive behavior. Philosophical Minimalism: No complex menus or distractions. This is a tool for the "Human + AI Society," designed to protect human autonomy against automated nudges. Privacy-First: Your impulses are your own. No personal data is collected or stored. [Who is it for?] Strategic Traders: Protect your capital by pausing before making an emotional exit or entry in volatile markets. Habit Reformers: Gain the upper hand over cravings (smoking, snacking, or mindless scrolling) by inserting a gap between stimulus and response. Digital Philosophers: Anyone seeking to maintain their sovereignty in an increasingly automated world. Reclaim your 15 seconds. Reclaim your life.

Screenshots

Violin Tuner1 screens

Verdict

The call

The clearest difference is ads: 15s War at none against Violin Tuner's shown. 15s War also leads on update cadence (daily vs every 16 months) and iOS requirement (13.0 vs 15.0). On price, 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

Violin Tuner ships an update every 16 months, 15s War daily. Both last shipped on October 28, 2026.

Scorecard3 real differences · 7 level
Violin Tuner versus 15s War: the parameters behind the verdict, then further details
ParameterViolin Tuner15s War
PriceFreeFree
Rating4.3 (1.5K ratings) — better—
Positive reviews41.4% of reviews—
Number of ratings1.5K — better—
Update frequencyEvery 16 monthsDaily — better
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supported—
DevicesiPhone, iPad, iPodiPhone, iPod, Apple Watch
Requires iOS15.013.0 — better
Further details — not scored
Size9 MB0 MB
Age rating4+4+
DeveloperAlvin YuKouhei Takagi

Bugs and requests

Violin Tuner

Reported bugs

3 issues
  • Buttons don't always register input
  • App crashes or freezes on some devices
  • No sound output on certain devices

Requested features

3 requests
  • Longer note duration
  • Chromatic tuner functionality
  • Ability to detect if string is flat or sharp

15s War

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Violin Tuner

No in-app purchases

None

15s War

No in-app purchases

Questions

Is Violin Tuner free?
Violin Tuner is free to download, with no in-app purchases.
Is 15s War free?
15s War is free to download, with no in-app purchases.
Do Violin Tuner or 15s War have ads?
Violin Tuner shows ads; 15s War does not.
Which is updated more often, Violin Tuner or 15s War?
Violin Tuner ships an update every 16 months, and 15s War daily. Most recently, Violin Tuner was updated on October 28, 2026 and 15s War on October 28, 2026.

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