Comparison

Noise Spectrum Logger vs おたすけTopik

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

Head to head

Noise Spectrum Logger

Free

📚 Education

★ 5.01 ratingsView app →

About

Noise Spectrum Logger

Visualize sound frequencies in real-time with a dynamic spectrum display. Log and export audio data for analysis, with options for smoothing and background processing. Access all features offline.

Highlights

Real-time spectrum display (20-20000Hz)
Zoomable spectrum view
Maximum value highlighting
Spectrum smoothing options (Mean/RMS)
Logging and CSV export
Background processing
Offline functionality

Features

Read full description

1. DESPLAY The power spectrum of sound is displayed in the range of 20 - 20000Hz. You can zoom in/out the spectrum by pinching in/out smoothly. Also landscape orientation is supported. 2. USEFUL While "hold" switch is ON, the maximum values are displayed in red color. You can select "Mean" or "RMS" as the way of smoothing the spectrum out. 3. LOGGING By sliding "log" switch, the logging mode is started. To choose a past log from "History" tab, you can pull it from iPhone via email as a CSV file. The CSV file can be edited with Excel etc. 4. AVAILABLE Without cellular data service, the full functions are available. 5. BACKGROUND PROCESSING You can use the logging function even when iPhone in your pocket. 6. TECHNICAL NOTE Sample rate: 44.1kHz Bit depth: 32bit float FFT window function: Blackman FFT samples: 8192

About

おたすけTopik

Features

Read full description

- 目標レベルの単語をランダムクイズで瞬間トレーニング - チャプター別学習で段階的にマスター - 間違えた単語だけをまとめて復習 - 毎日の出席チェック＆正答率グラフでモチベーション維持 - 効果的な４択クイズで繰り返し定着 - 自分だけの単語帳作成＆新単語登録機能 - お気に入りブックマークでいつでも復習OK - オフライン学習対応でモバイルデータ不要 - 通知設定で学習習慣化をサポート - アプリテーマ色５種・フォントサイズ調整・ライト／ダークモードで自由にカスタマイズ - 豊富な例文＆発音再生で記憶に定着今すぐダウンロードして、効率的にTOPIK突破への一歩を踏み出そう！

Screenshots

Noise Spectrum Logger4 screens

おたすけTopik4 screens

Verdict

The call

The clearest difference is update cadence: おたすけTopik at monthly against Noise Spectrum Logger's every 10 months. おたすけTopik also leads on iOS requirement (12.0 vs 15.5). On price, 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

Both are free to download. Noise Spectrum Logger sells 1 one-off in-app purchase and おたすけTopik sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Noise Spectrum Logger ships an update every 10 months, おたすけTopik monthly. The most recent releases landed on October 7, 2026 and October 28, 2026 respectively.

Scorecard2 real differences · 7 level

Noise Spectrum Logger versus おたすけTopik: the parameters behind the verdict, then further details
Parameter	Noise Spectrum Logger	おたすけTopik
Price	Free	Free
Rating	5.0 (1 ratings) — better	—
Number of ratings	1 — better	—
Update frequency	Every 10 months	Monthly — better
Ads	No	No
In-app purchases	Yes	Yes
Monetization	Free	—
Devices	iPhone, iPad, iPod	iPhone, iPad, iPod
Requires iOS	15.5	12.0 — better
Further details — not scored
Size	5 MB	184 MB
Age rating	12+	4+
Developer	Yukiko Iwai	jongseo won

In-app purchases

1 purchases

Noise Spectrum Logger

One-time1

Remove Ads$3.99

1 purchases

おたすけTopik

One-time1

おたすけ Topik Plus$7.99

Questions

Is Noise Spectrum Logger free?

Noise Spectrum Logger is free to download, with in-app purchases available.

Is おたすけTopik free?

おたすけTopik is free to download, with in-app purchases available.

Do Noise Spectrum Logger or おたすけTopik have ads?

Neither Noise Spectrum Logger nor おたすけTopik shows ads.

Which is updated more often, Noise Spectrum Logger or おたすけTopik?

Noise Spectrum Logger ships an update every 10 months, and おたすけTopik monthly. Most recently, Noise Spectrum Logger was updated on October 7, 2026 and おたすけTopik on October 28, 2026.