2026-10-27

JellyDazzle and KoiKnife Are Out on iPhone, iPad, Mac and Android

Two apps from LIBCSystems are now out everywhere: <a href="https://dazzle.jelia.nyc/">JellyDazzle</a>, the music-reactive kaleidoscope, and <a href="https://koiknife.jelia.nyc/">KoiKnife</a>, the Swiss Army Knife of koi knowledge. Both are on the App Store for iPhone, iPad and Mac, and on Google Play for Android. Both are free on the App Store.

<h2>JellyDazzle</h2>

JellyDazzle turns your screen into a kaleidoscope that listens to your music and dances to it. Put on a song, from Spotify, Apple Music, a speaker across the room or a band in a bar, and the patterns move with it. It listens through the microphone, so your music keeps playing at full volume while the colors fold into symmetry and back out again. No loops, no presets, no two sessions alike.

<ul> <li>Battery-smart: on battery it runs a lighter picture at 30 frames a second so it can play through a whole album; plug it in and it goes full resolution at 60.</li> <li>Versions: 3.6.6 on iPhone, iPad and Mac; 3.7.0 on Android.</li> </ul>

<figure> <img src="https://blog.jelia.nyc/img/rel-jellydazzle-iphone-1.jpg" alt="JellyDazzle on iPhone: a glowing kaleidoscope pattern in pink, green and blue around the JD logo" width="800" height="1738" style="max-width:360px"> <figcaption>JellyDazzle on iPhone.</figcaption> </figure>

<figure> <img src="https://blog.jelia.nyc/img/rel-jellydazzle-ipad-1.jpg" alt="JellyDazzle on iPad: a soft kaleidoscope pattern in pink and orange around the glowing JD logo" width="800" height="1067"> <figcaption>JellyDazzle on iPad.</figcaption> </figure>

Get JellyDazzle: <ul> <li>App Store (iPhone and iPad): <a href="https://apps.apple.com/us/app/jellydazzle/id6808884433">https://apps.apple.com/us/app/jellydazzle/id6808884433</a></li> <li>Mac App Store: <a href="https://apps.apple.com/us/app/jellydazzle/id6808884433?platform=mac">https://apps.apple.com/us/app/jellydazzle/id6808884433?platform=mac</a></li> <li>Google Play (Android): <a href="https://play.google.com/store/apps/details?id=nyc.jelia.jellydazzle">https://play.google.com/store/apps/details?id=nyc.jelia.jellydazzle</a></li> <li>Website: <a href="https://dazzle.jelia.nyc/">https://dazzle.jelia.nyc/</a></li> </ul>

<h2>KoiKnife</h2>

KoiKnife is everything a koi keeper, buyer or admirer needs, in one beautifully illustrated app. It is presented with B&M Aquatics of Hamburg, New Jersey, family owned since 2003.

<ul> <li>Identify: 33 koi varieties, from the Gosanke (Kohaku, Taisho Sanke, Showa) to Asagi, Shusui, Ogon, Kujaku, Chagoi, Tancho, Doitsu, Ginrin and butterfly koi, with large photographs, kanji names, color swatches and rarity.</li> <li>Tell them apart: "often confused with" links that teach the real differences.</li> <li>Prices: price bands from pond grade and hobbyist to Japanese import and show quality, at every size.</li> <li>Versions: 1.0.1 on iPhone and iPad; 1.0.2 on Mac; 1.0.1 on Android.</li> </ul>

<figure> <img src="https://blog.jelia.nyc/img/rel-koiknife-iphone-2.jpg" alt="KoiKnife on iPhone showing the Kohaku variety: a red and white koi photograph, kanji name, rarity and typical price" width="800" height="1738" style="max-width:360px"> <figcaption>KoiKnife on iPhone: the Kohaku variety card.</figcaption> </figure>

<figure> <img src="https://blog.jelia.nyc/img/rel-koiknife-ipad-1.jpg" alt="KoiKnife on iPad: the home screen with koi of the day and a grid of tools including Identify, History, Prices and Supplies" width="800" height="1067"> <figcaption>KoiKnife on iPad: the toolkit.</figcaption> </figure>

Get KoiKnife: <ul> <li>App Store (iPhone and iPad): <a href="https://apps.apple.com/us/app/koiknife/id6822839703">https://apps.apple.com/us/app/koiknife/id6822839703</a></li> <li>Mac App Store: <a href="https://apps.apple.com/us/app/koiknife/id6822839703?platform=mac">https://apps.apple.com/us/app/koiknife/id6822839703?platform=mac</a></li> <li>Google Play (Android): <a href="https://play.google.com/store/apps/details?id=nyc.jelia.koiknife">https://play.google.com/store/apps/details?id=nyc.jelia.koiknife</a></li> <li>Website: <a href="https://koiknife.jelia.nyc/">https://koiknife.jelia.nyc/</a></li> </ul>

<h2>Open source</h2> Both apps are open source under the MIT license. <ul> <li>JellyDazzle on GitHub: <a href="https://github.com/LIBCSYS/JellyDazzle">https://github.com/LIBCSYS/JellyDazzle</a></li> <li>KoiKnife on GitHub: <a href="https://github.com/LIBCSYS/koiknife">https://github.com/LIBCSYS/koiknife</a></li> </ul>

Both apps are made by LIBCSystems in Long Island, New York.