OpenShack Pileup Trainer
Pick callsigns from the crowd
$4.99
Several CW stations calling at once. Pick out the callsigns, adjust the band conditions and work through the pileup.
Two stations calling together is one thing. What about four, six or ten? OpenShack Pileup lets you practise pulling callsigns out of a CW pileup on your iPhone or iPad.
Choose one to ten callers, set the base WPM and listen. Stations differ in pitch, speed and signal strength. Add the sound of different fists, chirp, key clicks, hum and QSB to make copying more demanding.
Type the callsigns you copy and press Enter. A correctly copied station stops repeating, so you can concentrate on the others. Use headphones to take advantage of binaural stereo, which spreads the callers across the stereo image.
Adjust the run length, repeats and listening conditions. Review copied and missed callsigns after the run, with Challenge points reflecting the difficulty of the signals. Local personal bests let you compare similar runs.
Publish your score under your callsign if you want to compare with other operators on the OpenShack leaderboards. Choose manual publishing, a prompt after each run, or explicitly enable automatic publishing.
Pileup is a receiving exercise using audio and keyboard input. No radio, paddle or OpenShack Box is required. This app does not support Box input.
Practice and the included callsign list work offline, without an OpenShack account. Internet access is needed for online scores and website links. Settings and personal bests are saved on your device.
English interface for iPhone and iPad. One app purchase, no subscription. About links to help and other OpenShack CW apps.
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Improved on-screen keyboard input and corrections. Feedback and the results table fit smaller screens more clearly, with clearer entry of multiple callsigns. About now shows the correct iOS version and current companion-app links.
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
- 5.5 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
