# MrGhost > Sound and EMF level detector with waveform, history, and recording features. (iPhone/iPad app by Aaron RASMUSSEN.) - Source: https://appshunter.io/ios/app/mrghost/id586859423 (this page in markdown: same URL + `.md`) - Developer: [Aaron RASMUSSEN](https://appshunter.io/developer/586859426) - Category: Utilities, Entertainment - Price: Free - Rating: 2.90/5 from 9 App Store ratings · 26 written reviews indexed - Age rating: 4+ - Requires: iOS 5.0 · 6 MB - Languages: American English - Released: 2012-12-20 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/mrghost/id586859423/reviews.md ## What is MrGhost? This app is intended for entertainment purposes only and does not provide true ghost detecting functionality. MrGhost is the companion app for the MrGhost EMF detector that plugs into your headphone jack. Don't have the peripheral? No worries! This app works as an advanced sound level detector with your regular microphone so it will be fun anyways. Without Mr.Ghost it shows you: - Audio Waveform - Audio level history - Audio RMS power Adjust the sensitivity all the way left, and swing your phone back and forth in gyro mode to see the direction of high volume sound sources. Glow mode glows brighter/hotter based on sound level, it also allows recording of your audio and the ability to mail the file to yourself. If you do have Mr.Ghost it shows you - EMF level - EMF waveform - EMF level history In gyro mode swinging the phone back and forth shows you the direction of EMF sources Glow mode glows brighter the closer you are to a source. Record the fields and email them to yourself for later analysis. ## Key features - Audio waveform display - Audio level history - EMF level detection - EMF waveform display - Gyro mode for directional sensing - Glow mode for visual feedback - Audio recording and emailing ## Recent user reviews (10 of 26) All indexed reviews: https://appshunter.io/ios/app/mrghost/id586859423/reviews.md ### 1/5 — :( *2017-11-21* Please update this to work with iOS 11, I loved this app ### 1/5 — Needs An Update *2015-05-03* Worked great on my old phone, since I got an iPhone 6 it just doesn't work right... ### 5/5 — Works great *2014-12-10* I don't know what problem the other reviews have had but I've had the mrghost app for a while now and it and the antenna work perfectly fine on my 5s I'm constantly using it around my house and job. 5 stars for this perfectly functional and amazing app ### 1/5 — DOES NOT WORK ON IPHONE 5S *2014-09-16* I was super excited to purchase this product... Until I got home and found out that it does not work on the 5S. Had I known this beforehand I would have never waisted my money on it. VERY DISSAPOINTED!!! ### 3/5 — Needs immediate feedback *2014-06-28* The visuals execute alright on the iPhone, but the fact that I cannot hear the EMF audio as I wave the iPhone around and the fact that it picks up actual sound waves too doesn't work out very well. I usually end up pointing the phone at anything that reads high enough only to find out the crackling sound it made was pretty lame. ### 3/5 — Good but couldn't get glow mode *2014-05-07* The settings and ease of use is good but I couldn't get glow mode to work. After sliding all the way to a dark screen, nothing happened I tried many times with no success. ### 1/5 — Doesn't work with 5S or... *2014-04-15* ...it's soo fragile it breaks before you get it in the mail. I've gotten three of these antennas now and Not One works with my iPhone 5S with the latest iOS. This entire process has taken over a month in a half. I'm getting my money back from ThinkGeek. Only good thing about it all was the prompt email assistance you will get with the guy that owns the product. Still, looks cool, sounds cool, but my experience sucked. All very very unacceptable. ### 1/5 — The Nothing Detector *2013-11-10* I got suckered in by this one. It won't detect anything more than two inches away. If it's that close I don't need a detector. ### 5/5 — Awesome *2013-09-06* Mr ghost is a great app for entertainment. I found out my friend is ghost :-) ### 5/5 — Very fun and interesting to see what it reveals. *2013-04-28* Well done! ## Frequently asked questions about MrGhost ### What is MrGhost primarily used for? MrGhost is an entertainment app that functions as an advanced sound level detector. It can also detect EMF levels if you have the compatible MrGhost peripheral. ### Does MrGhost detect actual ghosts? No, MrGhost is intended for entertainment purposes only and does not provide true ghost detecting functionality. ### Can I use MrGhost without the MrGhost EMF detector peripheral? Yes, without the peripheral, MrGhost works as an advanced sound level detector using your device's microphone. ### What features are available for sound detection in MrGhost? When used as a sound detector, MrGhost displays audio waveforms, audio level history, and audio RMS power. It also includes a glow mode that brightens based on sound level. ### What is the rating and age appropriateness of MrGhost? MrGhost has a rating of 2.9 stars from 9 ratings and is rated for ages 4 and up. ### When was MrGhost last updated and on what devices is it available? MrGhost was last updated on November 17, 2013. It is available on iPhone and iPod. ### Can I record and save data from MrGhost? Yes, MrGhost allows you to record your audio or EMF fields and email the files to yourself for later analysis. ### How does the gyro mode in MrGhost work? In gyro mode, you can swing your phone back and forth to see the direction of high volume sound sources or EMF sources, depending on whether the peripheral is connected. ## Version history (last 5 releases) ### 1.35 — 2013-11-17 Now compatible with iPhone5s Sensitivity now automatically scales for phone model ### 1.3 — 2013-08-15 -Added new offset slider to increase sensitivity and response. -Added orientation locking on iPhone5 ### 1.2 — 2013-04-23 Added a spectrum analyzer, just tap the waveform display. Added an instructions/info button in the upper right corner. The screen no longer automatically locks. ### 1.12 — 2013-04-09 Added graphics fix for iPhone5. Reduced the range of the sensitivity slider to make it easier to set. ### 1.1 — 2013-03-18 Minor update. Added compatibility for iOS 5.0+ ## More apps by Aaron RASMUSSEN - [RGB Channel Mixer](https://appshunter.io/ios/app/rgb-channel-mixer/id6642659541) All apps by Aaron RASMUSSEN: https://appshunter.io/developer/586859426 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*