µMagnetometer vs 7gnuPrimeL∞R
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
µMagnetometer
Measures the strength of the magnetic field around you using your device's magnetometer. Requires Location Services to be enabled on iOS. Provides microtesla readings for nearby magnetic fields.
- Measures magnetic field strength
- Displays readings in microteslas
- Utilizes device magnetometer
- Requires Location Services (iOS)
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µMagnetometer is simple application for measure nearby magnetic field strength. Note: Magnetometer on IOS requires enabled Location Services!
7gnuPrimeL∞R
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タイトル上段より [image→R]はボタン ・左に隣接する数字入力欄に奇数の数字を入力 ・仮に1を入力すると[range]1[~9]のように[範囲]が表示 ・これは1を含まない2~9の間の素数の[位置]を調べる ・上記のボタンを押す ・画面が右にスライドして結果が表示 ・結果は全て点の羅列である // ;;;;. ・これは左から// 2;3;5;7;9. を意味する ・起点が一桁までは補足として数字が下部に表示 ・二桁以降で素数の位置ではなく数字が知りたい場合は [Calc↓L]より調べる [Calc↓L]はボタン ・右に隣接する数字入力欄に奇数の数字を入力 ・仮に3を入力すると[range]9[~25]のように[範囲]が表示 ・これは11~25の間の素数を調べる意味（奇数） ・√9 = 3 ←この範囲を調べる→ √25 = 5 ・上記のボタンを押す ・画面が下部にスライドし結果が表示 ・Count:５のように素数の数も表記 [ゴミ箱]Alldeleteボタン ・テキスト文字を全て一括消去する ・メモリー記録などアプリで保存する機能はありませんのでご注意ください ・テキストは長押しでコピーやペーストが可能です
Screenshots
Verdict
The clearest difference is update cadence: 7gnuPrimeL∞R at weekly against µMagnetometer's every 4 months. 7gnuPrimeL∞R also leads on price ($0.99 vs $1.99). µMagnetometer's advantage is iOS requirement (11.0 vs 14.2). 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
µMagnetometer costs $1.99 and 7gnuPrimeL∞R $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
µMagnetometer ships an update every 4 months, 7gnuPrimeL∞R weekly. The most recent releases landed on October 24, 2026 and December 7, 2025 respectively.
| Parameter | µMagnetometer | 7gnuPrimeL∞R |
|---|---|---|
| Price | $1.99 | $0.99 — better |
| Rating | 4.4 (67 ratings) — better | — |
| Positive reviews | 23.1% of reviews | — |
| Number of ratings | 67 — better | — |
| Update frequency | Every 4 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 11.0 — better | 14.2 |
| Further details — not scored | ||
| Size | 15 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Dmytro Hrebeniuk | Masaru Sasaki |
In-app purchases
µMagnetometer
No in-app purchases
7gnuPrimeL∞R
No in-app purchases
