# PSK31 > PSK31 ham radio decoder and viewer for iPad. (iPhone/iPad app by Black Cat Systems.) - Source: https://appshunter.io/ios/app/psk31/id385619882 (this page in markdown: same URL + `.md`) - Developer: [Black Cat Systems](https://appshunter.io/developer/301047032) - Category: Lifestyle, Utilities - Price: $2.99 - Rating: 3.60/5 from 15 App Store ratings · 23 written reviews indexed - Age rating: 4+ - Requires: iOS 6.0 · 1 MB - Languages: American English - Released: 2010-08-20 - Data updated: 2026-07-06 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/psk31/id385619882/reviews.md ## What is PSK31? Want to monitor PSK31 transmissions, without using a bulky computer? PSK31 lets you view ham radio PSK31 transmissions on your iPad. Just set your iPad next to your radio, tune in a PSK31 frequency, and watch the decoded text. There's a waterfall display of the audio spectrum, showing all of the PSK31 transmission. Tap on a signal, and PSK31 tunes into that transmission. Get your copy of PSK31 right now, and start decoding and displaying PSK31 transmissions in minutes. ## Key features - Monitor PSK31 transmissions - View decoded text - Waterfall display of audio spectrum - Tap to tune into signals - No computer required ## Chart rankings - #193 in Top Paid · Lifestyle (US App Store) ## Recent user reviews (10 of 23) All indexed reviews: https://appshunter.io/ios/app/psk31/id385619882/reviews.md ### 1/5 — PSK31 QSO - how to transmit? *2023-10-12, version 1.3* Reading is fine, but now I want to transmit. I could´t figure out how to transmit. ### 3/5 — It does work, but it still needs work... *2019-06-02, version 1.3* As I review this app, it appears that PSKer (which frankly has better functionality) has stopped working all together since the developer of that app stopped updating it years ago and now that app doesn’t accept audio input (needs permissions fix to be current with iOS). This app does work, but is a little rough around the edges. I wish it supported landscape mode for the iPad, tagging of waterfalls, and a more intuitive interface. In short, this is all we have for PSK on iOS right now and...at least it works, but still - wish the app would be updated. I’d gladly pay for it. 73, KI4ASK ### 1/5 — No working *2018-08-24* Doesn't working well on iOS 11. Throw away to the trash box. ### 2/5 — It works, but.... *2017-09-23, version 1.3* It does work with my Easy Digi by KF5INZ interface. Main problem I have is that you can not change the rotation of the app. I use it with an iPad Pro connected to a keyboard case. The will not display in landscape orientation (sideways), only in portrait mode. This makes the waterfall display small and I have to use the iPad outside of keyboard case. If it would display in landscape orientation with a larger waterfall, then I would use it more. ### 3/5 — Eh.....well if nothing else *2017-01-30, version 1.3* Okay. So I tried this with PSK31 and it works 'okay' but not the greatest. It will not copy PSK63. It would be great to have something like fldigi for iOS. Michael ### 1/5 — Needs major update *2016-09-27, version 1.3* Please add support for Apple Watch. Doesn't do a good job decoding. Needs ability to transmit as well. ### 5/5 — very very good！ *2015-10-16* I like it ！ By BH7OJ 73 ### 1/5 — Too Noise Sensitive *2015-09-03, version 1.2* Too noise sensitive to really be of any use. ### 3/5 — Not the easiest to use *2015-04-03, version 1.2* Noise sensitive and difficult to transmit ### 5/5 — PSK31App *2015-02-09, version 1.2* Works well, as do other apps from the Black Kat team ## Frequently asked questions about PSK31 ### What is PSK31 used for? PSK31 is a digital mode used by amateur radio operators for text-based communication. It's known for its efficiency and ability to work in noisy conditions, making it popular for sending messages over long distances. ### Does PSK31 work on Android devices? Based on the provided information, PSK31 is designed for Apple devices, specifically supporting iPhone, iPad, and iPod. There is no mention of Android compatibility. ### How does the waterfall display in PSK31 work? The waterfall display in PSK31 visually represents the audio spectrum of incoming radio signals. It shows the intensity of different frequencies over time, allowing users to identify and select PSK31 transmissions by their characteristic patterns. ### Can I use PSK31 offline? The app's primary function is to decode live radio transmissions, which requires an active radio signal. While the app itself doesn't require an internet connection to function, it needs to be used in conjunction with a radio tuned to a PSK31 frequency. ### What is the price of PSK31? PSK31 is a paid application, available for $2.99. This one-time purchase grants you access to all of its features for decoding and viewing PSK31 transmissions. ### How often is PSK31 updated? The latest version of PSK31 is 1.3, which was last updated on January 4, 2016. This indicates that updates are not very frequent, with the last known update being over 8 years ago. ### What is the age rating for PSK31? PSK31 has an age rating of 4+. This suggests that the content is generally suitable for young children, with no mature themes or content that would be inappropriate. ### Does PSK31 have ads? No, PSK31 does not contain advertisements. The application is a paid product, and the absence of ads ensures an uninterrupted user experience while decoding radio transmissions. ## Version history (last 5 releases) ### 1.3 — 2016-01-04 This update from Apple will improve the functionality of this app. No new features are included. Updates for iOS 9.2 ### 1.2 — 2014-10-10 Updates for iOS 8 ### 1.1.1 — 2012-09-24 Bug fixes for iOS 6 ### 1.1 — 2012-05-12 Now also works with the iPhone and iPod Touch ### 1.0.0 — 2010-08-20 No release notes. ## Apps similar to PSK31 | App | Rating | Price | Category | | --- | --- | --- | --- | | [DIRECTED SMARTSTART PRO](https://appshunter.io/ios/app/directed-smartstart-pro/id6740499759) | — | Free | Lifestyle | | [Offline Spotter for POTA/SOTA](https://appshunter.io/ios/app/offline-spotter-for-potasota/id6740120163) | 4.2 (12) | $0.99 | Lifestyle | | [MCHL Feilding](https://appshunter.io/ios/app/mchl-feilding/id1449019558) | — | Free | Lifestyle | | [Annunciation Catholic Academy](https://appshunter.io/ios/app/annunciation-catholic-academy/id1579891077) | 5.0 (5) | Free | Lifestyle | | [airH2o400Connect](https://appshunter.io/ios/app/airh2o400connect/id6736602579) | — | Free | Lifestyle | | [SSTV](https://appshunter.io/ios/app/sstv/id6754263308) | 5.0 (1) | $2.99 | Lifestyle | ## More apps by Black Cat Systems - [WireCalc](https://appshunter.io/ios/app/wirecalc/id301047029) - [Transmission Line Calc](https://appshunter.io/ios/app/transmission-line-calc/id302734281) - [RF Link Calc](https://appshunter.io/ios/app/rf-link-calc/id303034300) - [dB Calc](https://appshunter.io/ios/app/db-calc/id303470503) - [Drill Calc](https://appshunter.io/ios/app/drill-calc/id304434324) - [Photon Calc](https://appshunter.io/ios/app/photon-calc/id304436071) All apps by Black Cat Systems: https://appshunter.io/developer/301047032 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-06.*