J vs Morse Learn
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
J
This app provides official earthquake hazard maps for Japan, allowing users to view predictions of ground shaking intensity. It offers detailed information based on location and displays fault lines and seismic activity models.
- View national earthquake hazard maps
- Zoom, pan, and adjust map transparency
- Display probabilistic seismic hazard maps
- Show surface and deep ground maps
- View earthquake source fault locations
- Display seismic activity models
- Show location-specific earthquake probabilities
Read full descriptionHide full description
地震ハザードステーションJ-SHISの公式アプリケーションです。 J-SHISは全国地震動予測地図を表示するiPhone/iPad用公式アプリケーションです。J-SHISを手軽にスマートフォンで見ることができます。 ○全国地震動予測地図※の表示○ 現在公開している最新の全国地震動予測地図を表示することができます。地図は拡大・縮小、移動、透過率の変更を行うことができます。 ・確率論的地震動予測地図(30年震度6強以上となる確率) ・確率論的地震動予測地図(30年震度6弱以上となる確率) ・確率論的地震動予測地図(30年震度5強以上となる確率) ・確率論的地震動予測地図(30年震度5弱以上となる確率) ・長期間平均ハザード(再現期間10万年相当) ・表層地盤地図 ・深部地盤地図 ・想定地震地図 ※「全国地震動予測地図」は、将来日本で発生する恐れのある地震による強い揺れを予測し、予測結果を地図として表したものです。 ○GPSを利用した現在位置周辺の表示○ 地図表示範囲をGPSを利用して現在位置周辺にすることができます。 ○地点情報の表示○ 指定した地点で30年間に震度6弱以上の揺れに見舞われる確率や、表層地盤増幅率、地震ハザードカルテを表示することができます。 ○震源断層の位置と地震活動モデルの表示○ 地図上に主要活断層帯の位置・形状を表示することができます。震源断層をタップすると地震活動モデル(平均ケース)を表示します。
Morse Learn
Learn Morse code through guided steps and practice listening with random generation. Customize volume, playback speed, and tone, with added features like reverb and noise simulation for realistic training.
- Step-by-step Morse code learning
- Random Morse code generation for practice
- Adjustable volume, playback speed, and tone
- Reverb and noise simulation
- High-speed sound training adjustment
- Endless generation function
Read full descriptionHide full description
This is the Morse Codes learning App. You are able to lean the Morse codes by steps. There is a random generation function, you can practice listening of Morse Codes. You can also freely select the volume, playback speed, and playback tone. 1) Reverb function 2) Noise function 3) Added a function to switch between hardware and software for keying waveforms. 4) Added adjustment function (10-step adjustment) for high-speed sound training. 5) Endless generate function The "reverb function" simulates the reverberation of the test site. The "noise function" mutes the noise during actual communication.
Screenshots
Verdict
The clearest difference is ads: J at none against Morse Learn's shown. J also leads on monetization model (free vs ad-supported). Morse Learn's advantage is update cadence (every 2 months vs every 13 months) and review sentiment (44% vs 33%). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
J ships an update every 13 months, Morse Learn every 2 months. The most recent releases landed on September 10, 2026 and September 8, 2026 respectively.
| Parameter | J | Morse Learn |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | 33.3% of reviews | 44.4% of reviews — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 13 months | Every 2 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | National Research Institute for Earth Science and Disaster Prevention | koji kamogawa |
Customer experience
J
Morse Learn
In-app purchases
J
No in-app purchases
Morse Learn
No in-app purchases
