Comparison

Valiance Backbone for CW vs VoltKeep

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Valiance Backbone for CW

Decode Morse code signals in real-time using your device's microphone. This app employs advanced FFT technology to accurately distinguish transceiver signals from noise, offering a high success rate for radio communications. It features a range of tools for signal analysis and log management.

Highlights
  • Real-time Morse code decoding via microphone
  • Advanced FFT technology for signal detection
  • Minimizes false decodes from noise
  • Morse Sound Recorder & Player
  • Export text logs and audio data
  • Predictive decoding for difficult codes
  • Tone and sound pressure measurement
Features
Read full description

Morse Decoder: Valiance Backbone for CW (VBC) VBC is the No. 1 Morse code decoder in the Japanese market, encompassing both paid and free categories. This app allows you to decode Morse code using the built-in microphone of your iPhone or iPod touch. VBC utilizes the world's fastest FFT (Fast Fourier Transform) technology to detect and decode carriers. It is specifically designed to minimize false decodes from atmospheric noise, voices, or beep sounds (square or trapezoidal waves). While it will not decode vocalized "dit-dah" sounds, it offers an extremely high success rate for decoding actual transceiver signals. (Please check our videos of real DX station communications). We believe its decoding capability surpasses that of many expensive dedicated hardware units and PC software. The carrier detection mode is highly effective, making it a truly practical tool for active hunting and pouncing in real-world radio operations. The default settings are optimized for the best performance balance. We recommend testing it with an actual radio (800Hz tone) at a short distance using the default configuration. Key Features: Morse Sound Recorder & Player Export text logs, audio data, and history via email Timestamp and cancel stamp insertion in logs Predictive decoding for difficult or connected Morse codes Zero-in Tone Indicator / Shift-in Indicator Tone frequency measurement (±5Hz) Sound pressure measurement (dB) Audio frequency response measurement & automatic correction Peak search / Manual frequency setting (double-tap screen) Automatic speed tracking / Manual speed setting (double-tap screen) Auto Level / Auto Threshold / Manual Threshold (double-tap screen) Noise reduction & waveform shaping via carrier detection Japanese (Wabun) Morse support Signal level adjustment Input Level Over-Range Indicator When the input level exceeds the range (Over-Range), the waveform becomes distorted, leading to poor decoding accuracy. If this happens, please move your device further away from the radio. (Avoid placing the device directly on a vibrating radio; maintain a sufficient distance. The app is designed to decode accurately even from a significant distance.)Supports decoding speeds from 5 to 40 WPM For more information and to see the app in action, please visit our YouTube channel for Real-DX videos and more: http://goo.gl/ALXAqH http://goo.gl/yEu3d1 http://goo.gl/7gp4yw Note: Due to scrolling issues on the decode screen since iOS 8, we utilize the following library for text display. Our sincere thanks to the developer: SECoreTextView Created by kishikawa katsumi on 2015/03/25. Copyright (c) 2013-2015 kishikawa katsumi. All rights reserved.

About

VoltKeep

Features
Read full description

VoltKeepは、Tesla公式のFleet Telemetryを使って走行・充電・バッテリーをリアルタイムに記録するダッシュボードアプリです。車両へのポーリングを行わないためバッテリーに優しく、走行データはエンドツーエンド暗号化であなただけのものになります。 ■ 主な機能(無料) ・リアルタイムダッシュボード: バッテリー残量・航続距離・車両の現在地・車内外の温度 ・タイムライン: トリップ(ルート地図・距離・電費・速度ヒートマップ)と駐車・充電を時系列で自動記録 ・充電履歴: 充電セッションを自動検出し、バッテリー%・kWh・充電速度を表示 ・電費分析: Wh/kmの推移と日次サマリー ・セントリーモードとバッテリードレインの記録 ■ VoltKeep Pro(7日間無料トライアル) ・スーパーチャージャー充電履歴: サイト名と実際の請求額をタイムラインに表示。電気代は実費で自動補正 ・全期間の走行履歴(無料版は直近7日) ・月次レポート&AI運転分析: 1ヶ月のルートマップ、ドライブカレンダー、AIによる電費の深掘り ・バッテリー健康度の長期トレンドとPDFレポート ・充電予約コマンド、複数車両、CSVエクスポート ■ プライバシー・セキュリティ ・走行データはX25519+AES-256-GCMでエンドツーエンド暗号化。サーバー上でも中身は読めません ・走行・充電データを第三者に販売・共有することはありません ■ ご利用に必要なもの ・Teslaアカウント ・Fleet Telemetry対応車両 ※本アプリはTesla, Inc.が提供する公式アプリではありません。TeslaはTesla, Inc.の商標です。 利用規約(EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Valiance Backbone for CW4 screens
VoltKeep3 screens

Verdict

The call

The clearest difference is price: VoltKeep at Free against Valiance Backbone for CW's $3.99. VoltKeep also leads on update cadence (every 3 days vs every 11 months). Valiance Backbone for CW's advantage is iOS requirement (11.0 vs 17.0). On ads, in-app purchases and device support 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

CostPrice · In-app purchases · Ads · Monetization

VoltKeep is free to download; Valiance Backbone for CW costs $3.99 up front. Valiance Backbone for CW sells 4 one-off in-app purchases and VoltKeep sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Valiance Backbone for CW ships an update every 11 months, VoltKeep every 3 days. The most recent releases landed on November 1, 2026 and November 5, 2026 respectively.

Scorecard3 real differences · 7 level
Valiance Backbone for CW versus VoltKeep: the parameters behind the verdict, then further details
ParameterValiance Backbone for CWVoltKeep
Price$3.99Free — better
Rating2.0 (1 ratings) — better—
Positive reviews72.7% of reviews—
Number of ratings1 — better—
Update frequencyEvery 11 monthsEvery 3 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationPaid—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS11.0 — better17.0
Further details — not scored
Size28 MB74 MB
Age rating4+4+
DeveloperNobYuto Furudate

In-app purchases

4 purchases

Valiance Backbone for CW

One-time4
  • Tip for the Developer$0.99
  • Standard Support$4.99
  • Premium$9.99
Show 1 more
  • Ultimate Supporter$29.99
2 purchases

VoltKeep

Subscriptions2
  • Monthly Plan7 Days trial$4.991 Month
  • Yearly Plan7 Days trial$49.991 Year

Questions

Is Valiance Backbone for CW free?
Valiance Backbone for CW costs $3.99, and also offers in-app purchases.
Is VoltKeep free?
VoltKeep is free to download, with in-app purchases available.
Do Valiance Backbone for CW or VoltKeep have ads?
Neither Valiance Backbone for CW nor VoltKeep shows ads.
Which is updated more often, Valiance Backbone for CW or VoltKeep?
Valiance Backbone for CW ships an update every 11 months, and VoltKeep every 3 days. Most recently, Valiance Backbone for CW was updated on November 1, 2026 and VoltKeep on November 5, 2026.

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