Violin Tuner vs 15s War
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Plays G tuning note
- Plays D tuning note
- Plays A tuning note
- Plays E tuning note
- Simple interface
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Plays tuning notes for the violin (G D A E).
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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Violin Tuner ships an update every 16 months, 15s War daily. Both last shipped on October 28, 2026.
| Parameter | Violin Tuner | 15s War |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (1.5K ratings) — better | — |
| Positive reviews | 41.4% of reviews | — |
| Number of ratings | 1.5K — better | — |
| Update frequency | Every 16 months | Daily — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 0 MB |
| Age rating | 4+ | 4+ |
| Developer | Alvin Yu | Kouhei 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
Violin Tuner
No in-app purchases
15s War
No in-app purchases









