EMF Detector vs MathAlarm
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
EMF Detector
Transform your iPhone into an EMF detector to monitor electromagnetic fields. Identify radiation levels in various environments to assess safety at home, work, or in public spaces. Gain insights to make informed decisions about your surroundings.
- EMF monitoring
- Electromagnetic field detection
- Radiation level measurement
- Environmental safety assessment
- Real-time EMF readings
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Monitor your surroundings with precision using our EMF Monitoring app, designed exclusively for iOS. This innovative application transforms your iPhone into a powerful EMF detector, enabling you to identify electromagnetic fields in various environments. As you move through different areas, the app continuously measures EMF levels, allowing you to easily pinpoint zones of high and low radiation. Whether you're concerned about safety at home, in the workplace, or in public areas, EMF Monitoring provides the insights you need to assess environmental safety and make informed decisions about your surroundings. This app is using the standard Apple Terms of Use (EULA) https://www.apple.com/legal/ internet-services/itunes/dev/stdeula/
MathAlarm
This alarm app requires users to solve math problems to turn it off, ensuring they are fully awake. It offers customizable settings for repeat schedules, difficulty levels, and alert types, all managed directly on your wrist.
- Solve math problems to stop alarm
- Customizable repeat schedules
- Four difficulty levels
- Haptic or Sound + Vibrate alerts
- Multiple independent alarms
- Runs entirely on Apple Watch
- No iPhone required
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Wake up. Actually wake up. MathAlarm is an Apple Watch alarm that won't let you drift back to sleep. To dismiss the alarm, you have to correctly solve a math problem — no more silencing it half-asleep and rolling over. Set alarms with: • Repeat schedules — once, or any combination of weekdays • Four difficulty levels — Easy, Medium, Hard, and Expert • Haptic Only or Sound + Vibrate alerts • Multiple independent alarms, each configured separately When the alarm fires, you're shown a math problem with four multiple-choice answers. Get it right and the alarm stops. Get it wrong and a fresh problem appears — you have to actually think before you can go back to sleep. MathAlarm runs entirely on your wrist. No iPhone required nearby, no account, no subscription. Add a MathAlarm complication to your watch face for a quick glance at your next alarm. No ads. No tracking. No subscriptions — just an alarm that makes sure you're really awake.
Screenshots
Verdict
The clearest difference is review sentiment: MathAlarm at 100% against EMF Detector's 25%. MathAlarm also leads on rating (5.0 vs 4.4) and in-app purchases (none vs 3). EMF Detector's advantage is price (Free vs $0.99) and ratings volume (339 vs 2). On update cadence, ads 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
EMF Detector is free to download; MathAlarm costs $0.99 up front. EMF Detector sells 2 in-app purchases, starting at $4.99 per month. MathAlarm asks for nothing beyond the download.
MathAlarm holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: EMF Detector has 339 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 25% of EMF Detector's written reviews are positive against 100% of MathAlarm's.
Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | EMF Detector | MathAlarm |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.4 (339 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 25.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 339 — better | 2 |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 11 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | 新雨 李 | Discipline Labs LLC |
Customer experience
EMF Detector
MathAlarm
In-app purchases
EMF Detector
- unlimited features2 variants$4.991 Month
- unlimited features$14.99
MathAlarm
No in-app purchases









