SolPlayer vs Speedy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SolPlayer
Transform your favorite music into Solfeggio sound sources. This app allows you to play music, create playlists, and adjust playback speed. It also features a unique Solfeggio mode to convert audio to specific healing frequencies.
- Music playback with repeat and resume
- Background audio playback
- Adjustable playback speed (0.1x to 8.0x)
- Playlist creation and editing
- Solfeggio mode with frequency conversion
- Two Solfeggio conversion types available
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あなたの好きな曲をソルフェジオ音源に。 あなたが普段聴いているのはどんな曲ですか? あなたの好きな曲のジャンルは? 「ヒーリング」「瞑想音楽」「クラシック」… このように、「人の身体や精神を癒やす、高める」音楽もあれば、 「J-POP」「ロック」「演歌」… このようなジャンルの音楽がすきな方もいらっしゃるでしょう。 人の好みは、人それぞれ。 だからこそ、あなたの好きな音楽を… 「人の身体や精神を癒やし、高める」効果を持つ ソルフェジオ音源(528Hz)に変えてしまいましょう! 【機能】 1.音楽再生機能 「再生」「リピート(一曲リピート・全曲リピート)」「指定位置から再生」等、一般的な音楽プレイヤーとしての機能を搭載しています。 2.バックグラウンド再生 他のアプリを使いながら、あるいはiPhoneの画面をオフにした状態で音楽を聴くことができます。 3.再生速度変更 再生スピードを0.1〜8.0倍に変更できます。リアルタイムに、高い音質のままスピードを変えられます。速聴などにどうぞ。 4.プレイリスト作成・編集 このアプリで再生する音源のプレイリストを作成・編集することが出来ます。 5.ソルフェジオモード このアプリの肝です。このプレイヤーで流せる音源すべてをソルフェジオ化することができます。ON/OFF切り替えの他、「設定」からソルフェジオ化の種類を選ぶことが出来ます。(2016/6/27現在:2種類) Ver1: 440Hzを444Hz(C:528Hz)に変換 Ver2: 440Hzを432Hzに変換 ※すでにソルフェジオ化されている音源には使用しないでください。本来の効果が半減する可能性があります。 【注意点】 ・ヘッドフォンを抜し差しした際は、安全のためプレイヤーを「停止」する仕様となっております。 ・音量変更はiPhoneのボタンで行ってください。(音量にはご注意ください)
Speedy
Automatically adjusts music volume based on your speed, compensating for ambient noise. Works with any audio app and offers customizable settings for various vehicles. Enjoy seamless audio on the go without manual adjustments.
- Automatic speed-based volume compensation
- Works with any audio app
- Customizable compensation strength
- Vehicle presets and custom profiles
- Auto-detect mode for profile switching
- Smart phone call handling
- Apple Watch app integration
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SpeedyQ automatically adjusts your music volume based on how fast you're moving — so you never have to touch the volume again. HOW IT WORKS Set your volume to a comfortable level at a stop. As you drive, SpeedyQ gradually increases the volume to compensate for road and wind noise. When you slow down, the volume comes back down. It's that simple. WORKS WITH ANY AUDIO APP SpeedyQ works with Apple Music, Spotify, podcasts, audiobooks — anything playing audio on your iPhone. SMART FEATURES • Automatic speed-based volume compensation • Works over Bluetooth with your car, motorcycle, boat, or headphones • Customizable compensation strength (Mild to Strong) • Vehicle presets for cars, motorcycles, bicycles, boats, and walking/running • Create custom vehicle profiles with personalized compensation curves • Auto-detect mode that switches profiles based on your speed • Smart phone call handling — pauses during calls and recovers automatically • Safe volume cap prevents sudden loud audio APPLE WATCH APP • See your speed and boost at a glance • Toggle SpeedyQ on/off from your wrist • Adjust compensation strength with the Digital Crown • Watch complication for your Watch face LIVE ACTIVITY & DYNAMIC ISLAND • See speed, boost, and volume on your lock screen • Dynamic Island shows real-time compensation data • Works alongside your music app's Now Playing DESIGNED FOR • Daily commuters • Road trip enthusiasts • Motorcycle riders • Boaters • Cyclists • Anyone who listens to audio on the go SET IT AND FORGET IT SpeedyQ works in the background with your screen locked. Just open it once, set your preferred strength, and enjoy perfectly adjusted volume every time you drive. Requires location access for speed detection.
Screenshots
Verdict
The clearest difference is review sentiment: Speedy at 100% against SolPlayer's 57%. Speedy also leads on rating (5.0 vs 1.0) and update cadence (every 3 days vs every 3 weeks). SolPlayer's advantage is iOS requirement (15.6 vs 17.0). On price, ratings volume, ads and in-app purchases 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.
Speedy holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews point the same way: 57% of SolPlayer's written reviews are positive against 100% of Speedy's.
SolPlayer ships an update every 3 weeks, Speedy every 3 days. Both last shipped on October 5, 2026.
| Parameter | SolPlayer | Speedy |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 57.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 | 1 |
| Update frequency | Every 3 weeks | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, Apple Watch — better |
| Requires iOS | 15.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 3 MB | 57 MB |
| Age rating | 4+ | 4+ |
| Developer | Naoya Morioka | SpeedEQ, LLC |
Customer experience
SolPlayer
Speedy
In-app purchases
SolPlayer
No in-app purchases
Speedy
No in-app purchases









