WiDrawer2 vs Audio SA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
WiDrawer2
Access and manage files on SD cards and USB flash drives wirelessly from your iOS device. Browse, copy, delete, and stream media content directly from your storage devices. Supports various file types and offers convenient features like slideshows and batch copying.
- Wireless file access
- Browse, copy, and delete files
- Create and manage folders
- Thumbnail display for images
- Stream music and videos
- Photo slideshows
- File search functionality
- Batch copy to camera roll
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このアプリはRATOC Wi-Fiストレージ専用アプリ「WiDrawer2(ワイドロワー2)」です。 本アプリをインストールする前に、WiDrawer2に対応したファームウェアに更新してくだ さい。 ファームウェアの提供や更新方法については、弊社 ホームページを参照してください。 対象製品: ・REX-WIFISD1 (ファームウェア Ver.3.000.046以降) ・REX-WIFIUSB1 (ファームウェア Ver.3.000.026以降) ・REX-WIFIUSB2 (ファームウェア Ver.3.000.006以降) ・REX-SD1D (ファームウェア Ver.3.000.004以降) ・REX-WIFIMSD1-26/52 (ファームウェア Ver.3.000.012以降) ・REX-SD2D (初期バージョンから対応済) ・REX-WIFISD2 (初期バージョンから対応済) iOS端末からワイヤレスで、SDカードやUSBフラッシュメモリ内の写真や動画を見たり、コピーしたりすることができます。 【注意】 ※上記バージョン以前のファームウェアでご使用の場合、動作不具合が発生する場合がありますので、必ずWindowsパソコンもしくはMacからファームウェアのアップデートをおこなってください。 ※ご使用開始の前に、iOS端末の自動ロックを”オフ”にしていただきますようお願いいたします。ファイルコピー中に自動ロックがかかりますとコピーが中断されます。 対応SDカード: ・SD、SDHC、SDXC 128GBまで動作確認済み 主な機能: ・ファイルの閲覧、コピー、削除 ・フォルダの作成、コピー、削除 ・サムネイル表示(画像) ・音楽や動画のストリーミング再生 ・写真のスライドショー ・ファイル検索 ・カメラロールへの一括コピー(jpg,png,bmp,gif,tif,mov,mp4,m4v) ラトックシステム株式会社(RATOC Systems, Inc.)
Audio SA
This app analyzes audio waveforms to create visual voiceprints as TFFT images. It offers extensive customization for FFT analysis, including adjustable ranges, sizes, scales, and window functions. A simple waveform generator is also included for learning purposes.
- TFFT voiceprint image generation
- High-resolution image export
- Customizable FFT analysis settings
- Adjustable audio waveform analysis range
- Simple waveform generator (sine, square, noise)
- Multiple FFT sizes and window functions
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"Audio SA" is a spectrum analyzer that can capture voiceprints as TFFT images. The created TFFT image can be exported as a high resolution image. (Image size example iPhoneSE3: 4096×4096, iPhoneX: 6144×6144) If you just want to try creating a voiceprint, you don't need to worry about the settings. Just record your voice and run the TFFT to see the voiceprint. "Audio SA" can also be used for FFT-related learning. You can also check changes in important characteristics such as FFT frequency resolution and dynamic range while switching the FFT size and window function. As an additional function, we have implemented a simple waveform generator, so please try it when learning. The simple waveform generator can generate sine waves, square waves, Gaussian white noise, and their combinations. When using TFFT images for machine learning, etc., it will be necessary to give sufficient consideration to the settings. "Audio SA" allows you to set the audio waveform analysis range, FFT size, power spectrum scale, window function, and drawing color. The analysis range of the audio waveform is set by scaling and moving the audio waveform. The displayed range becomes the analysis range. Tap the play button to play only the analysis range, which is convenient for checking. FFT size can be selected from 256,512,1024,2048,4096,8192,16384,32768. (However, you can select from 256, 512, 1024, 2048, and 4096 during recording and playback.) The power spectrum scale can be selected from Linear scale, Log scale, and Mel scale. For Mel scale, you can set the break frequency. The mel scale is close to a linear scale up to the break frequency and close to a log scale after the break frequency. 700Hz, which is the most commonly used frequency, is set as the default value. The window function can be selected from Blackman, Hamming, Hann, Rectangular. It is recommended to choose Blackman when wide dynamic range is required and Hamming when high frequency resolution is required. Roughly speaking, Hann is a trait between Blackman and Hamming. For Rectangular, no special window function is multiplied during FFT transform. The audio data cut out from the audio waveform for the FFT size is used as it is. In addition, the lower limit of the dynamic range when drawing TFFT images can also be set. It's easy to set up, just swipe up and down on the FFT image. The part displayed as the FFT image is drawn as it is in the TFFT image. "Audio SA" consumes tickets to record audio. Tickets can be earned by watching ads. However, if you purchase "Remove Ads" as an in-app purchase, you will be able to record without a ticket. [details] https://app.brain-workout.org/spectrumanalyzer-e/
Screenshots
Verdict
The clearest difference is review sentiment: Audio SA at 100% against WiDrawer2's 12%. WiDrawer2's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price 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
Both are free to download. Audio SA sells 1 one-off in-app purchase. WiDrawer2 asks for nothing beyond the download.
WiDrawer2 ships an update every 3 months, Audio SA every 6 months. The most recent releases landed on September 21, 2026 and September 11, 2026 respectively.
| Parameter | WiDrawer2 | Audio SA |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 12.1% of reviews | 100.0% of reviews — better |
| Update frequency | Every 3 months — better | Every 6 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 7.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 52 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | RATOC Systems, Inc. | Yasuyoshi Ota |
Customer experience
WiDrawer2
Audio SA
In-app purchases
WiDrawer2
No in-app purchases
Audio SA
- Remove ads.$3.99









