OpenShack Balloon Burst
Copy and send Morse code
$4.99
A quick round of CW practice. Copy by ear or practise sending. Burst the balloons before they pile up.
Make regular CW practice more enjoyable while improving your receiving and sending. Hear CW, copy it correctly and burst the balloons before they pile up, or switch to sending practice. As you move up the levels, the speed increases and more balloons join the challenge.
Practise single characters, character groups, words or callsigns. Choose A-Z for character and group practice without switching keyboard layouts, or Mixed to include numbers and punctuation. Set your starting level and work on your speed and accuracy.
In TYPE mode, copy by ear and type what you hear. For sending practice, key the characters, groups, words or callsigns with the on-screen paddle or your own paddle connected through an OpenShack Box.
Build a streak, catch the bonus balloons and try to beat your personal best. If you want to compare with other operators, publish your score under your callsign to the OpenShack leaderboards. A-Z and Mixed have separate character categories. You decide whether to publish each score, be asked after a run, or enable automatic publishing.
Practice works offline; no OpenShack account is required. Internet access is needed for online scores, Network Box connections and website links. Settings and personal bests stay on your device.
Use your own paddle with an optional OpenShack Box, sold separately. Connect through Bluetooth LE or Wi-Fi and the internet (Network Box). Compatible firmware is required. USB serial connections are not supported on iOS.
English interface for iPhone and iPad. One app purchase, no subscription. Help and the OpenShack manual are linked from About.
OpenShack CW by DL2CC.
Raise media volume to hear CW; Silent Mode may stay enabled. Practice stops when the app enters the background or the device locks.
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The top edge is now the ceiling, with the previous gameplay timing preserved. Game sound effects are quieter; CW tone volume stays the same.
The developer, Frank Grossmann e.K., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- User Content
- Identifiers
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Grossmann GmbH
- Size
- 5.9 MB
- Category
- Education
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Frequent
Contests
Contains
User-Generated Content
- Copyright
- © 2026 Grossmann GmbH
