echo~echo | êkhos vs SR
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
echo~echo | êkhos
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êkhos is a stereoscopic audiovisual work you hold in your hands — a single, slowly turning orb of granular noise, suspended in black and rendered in 3D. On iPhone, iPad and Mac it plays in anaglyph 3D: classic red-cyan stereoscopy. Put on a pair of red-cyan glasses and the orb lifts off the screen into real depth — strands of light drifting toward you and away, the echo made dimensional. THE WORK êkhos takes its name from the ancient Greek word for resonance — the echo as a thing in itself, rather than an effect. The title, )))echo~echo(((, also reads as noizu — ノイズ, Japanese for noise. The piece sits exactly there: between the echo and the noise, between a sound and the residue it leaves behind. THE DUO êkhos is the work of Mariusz Szypura and Paweł Krawczyk — a long-running guitar and ambient duo. Their music is built from prepared guitars, granular textures, field recordings and slow-moving harmonic clouds: long-form pieces that drift rather than progress. Here that sound is paired with stereoscopic image, so depth itself becomes part of the composition. THE INSTALLATION êkhos was presented at Lincoln Center during Unsound Festival NYC, 2024, as an anaglyph stereoscopy A/V installation. This app brings that installation home: the same prepared-guitar drones and the same drifting visual depth, now on your own screen. HOW TO WATCH • Bring red-cyan (anaglyph) 3D glasses — the inexpensive cardboard kind work perfectly. • Find a dark room and turn the volume up; the piece lives in low light and long duration. • Tap to play. The controls fade away and leave you with the orb. TUNE THE DEPTH TO YOUR EYES The player decomposes the stereoscopic image live, so you can shape the 3D to your own eyes and glasses while the film plays: • DEPTH — shifts the stereo convergence plane in real time: pull the orb out in front of the screen, or push it back behind it. • TINT — calibrates the red-cyan balance to your particular pair of glasses, for a clean, ghost-free image. • 3D / 2D — no glasses at hand? Switch to 2D and watch the film as a flat, luminous monochrome sphere. PRIVATE BY DESIGN No account. No sign-in. No analytics. No tracking. No ads. The film is bundled inside the app and plays fully offline. êkhos is also available on Apple Vision Pro as a true Spatial Video, with real stereoscopic depth and no glasses required. On every screen it is the same idea: an echo you can step inside. Released on Black Element Label.
SR
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For musicians, it’s a sketchpad. Catch the idea on your phone, then bring the recording into your DAW and finish it there. A desktop version is coming soon. For everyone else, it’s a way in. You don’t need lessons, theory, or a studio. Tap a step. Hear a kick. Add a snare. Change the tempo. The beat is already yours. Nothing is hidden behind a pile of menus. Patterns sit in front of you. The mixer is close. FX follow your hand. When something feels right, record the take. Two phones can share one clock. Hits land together. The session stays in time.
Screenshots
Verdict
The clearest difference is price: echo~echo | êkhos at Free against SR's $1.99. echo~echo | êkhos also leads on device support (5 vs 2). SR's advantage is iOS requirement (15.0 vs 17.0). On 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
echo~echo | êkhos is free to download; SR costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | echo~echo | êkhos | SR |
|---|---|---|
| Price | Free — better | $1.99 |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, Mac, Apple TV, Vision Pro — better | iPhone, iPod |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 791 MB | 67 MB |
| Age rating | 4+ | 4+ |
| Developer | United App Sp. z o.o. | Studio Romann |
In-app purchases
echo~echo | êkhos
No in-app purchases
SR
No in-app purchases
Questions
Is echo~echo | êkhos free?
Is SR free?
Do echo~echo | êkhos or SR have ads?
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