# Good4Night > High-frequency sound generator for mosquito repellent, night clock, and alarm. (iPhone/iPad app by Riyam Computer Services LLC.) - Source: https://appshunter.io/ios/app/good4night/id307226801 (this page in markdown: same URL + `.md`) - Developer: [Riyam Computer Services LLC](https://appshunter.io/developer/298046693) - Category: Entertainment, Utilities - Price: Free - Rating: 1.00/5 from 1 App Store ratings · 7 written reviews indexed - Age rating: 4+ - Requires: iOS 11.3 · 12 MB - Languages: American English - Released: 2009-03-09 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/good4night/id307226801/reviews.md ## What is Good4Night? This application generates high frequency sound in the range (20000 Hz-22000 Hz) that is inaudible to most of the humans. However, insects like mosquito can here this sound and it is annoying for them so they do not come close to this device . For best result attach external speaker. This is 3 in 1 application which can work as your Night Clock , Alarm , Mosquito repellent Have a Good Night Sleep ! Volume And Distance To Your Cell Phone: Caution: Do not put your ears directly or very close to the speakers when the tone is playing at a high volume. You will risk damaging your hearing. Even though you can’t hear the tones, the sound is there if you are playing it and has the potential of damaging your ear.) Application developed by Riyam Computer Services LLC, OMZEST (Omar Zawawi Establishment). Muscat, Sultanate of Oman based in GULF GCC Disclaimer -------- We are not responsible for any side effects caused by high frequency sound generated by the application. This application cannot be used as a substitute for any medicine or conventional mosquito repellent available in the market. This application is not tested on any animal. We hereby expressly disclaim any implied warranties imputed by the laws of any jurisdiction. Disclaimer of warranties You expressly understand and agree that: 1. GoodNight makes no warranty that the service(s) offered through our application can meet your requirements, 2. will be uninterrupted, timely, secure, or error-free. if you don't agree with any of our disclaimers above please do not deploy this application on iPhone or iPod Touch. ## Key features - High-frequency sound generation - Mosquito repellent functionality - Night clock display - Alarm clock - External speaker support ## Recent user reviews (7 of 7) All indexed reviews: https://appshunter.io/ios/app/good4night/id307226801/reviews.md ### 1/5 — Maybe it works *2009-05-11, version 0* This app seems to work but the clock and timer are unneccesary. Can anyone say if app works while iPhone is locked? ### 1/5 — Dont work update *2009-04-26, version 0* When update the app don't work more!!!! ### 1/5 — I can hear it *2009-04-25, version 0* I can hear it!! ### 1/5 — Bad 20,000 Hz mistake *2009-04-18, version 0* The frequancy it turns on is way too low for some reason. Human hearing range is between 20 and 20,000 Hz. So these apps saying 20k can not be heard is a lie. Depending on age and other factors you might not be able to hear 20k though. They say around age 18 is where it starts going down ### 1/5 — Ehh *2009-04-16, version 0* Stupid ### 1/5 — At least it was free *2009-03-26, version 0* Did not function at all, waste of time. ### 4/5 — Mosquito Repellant *2009-03-24, version 0* Mosquito repellant seems to be effective but I fail to see the need for a timer. ## Frequently asked questions about Good4Night ### Does Good4Night have ads? The provided data does not specify if Good4Night contains advertisements. It is listed as a free application. ### What is the effectiveness of Good4Night as a mosquito repellent? The application generates high-frequency sound (20000 Hz-22000 Hz) that is inaudible to most humans but annoying to insects like mosquitoes, deterring them from approaching the device. For best results, attaching an external speaker is recommended. ### What are the safety precautions for using Good4Night? Users are cautioned not to place their ears directly or very close to the speakers when the tone is playing at a high volume, as this could risk damaging hearing. Even though the tones may be inaudible, they are present and have the potential to cause harm. ### What devices is Good4Night compatible with? Good4Night is available for iPhone and iPod Touch devices. ### When was Good4Night last updated? The application was last updated on September 14, 2018, with the latest version being 1.7. ### What is the age rating for Good4Night? Good4Night has an age rating of 4+, making it suitable for younger users as well as adults. ### Can Good4Night be used as a substitute for medical treatments or conventional repellents? No, the developers state that this application cannot be used as a substitute for any medicine or conventional mosquito repellent available in the market. They also disclaim responsibility for any side effects caused by the high-frequency sound. ### What is the user rating for Good4Night? Good4Night has a rating of 1.0 stars from 1 rating, indicating a very low user satisfaction based on the available data. ## Version history (last 5 releases) ### 1.7 — 2018-09-14 iOS 11 compatible ### 1.5 — 2011-03-08 IOS 4.2 Compatible ### 1.4 — 2009-04-28 Rectified Mosquito Repellent Sound problem. Added two colors as display option ### 1.2 — 2009-04-13 No release notes. ### 1.1 — 2009-03-23 No release notes. ## Apps similar to Good4Night | App | Rating | Price | Category | | --- | --- | --- | --- | | [Fast Charging Animation](https://appshunter.io/ios/app/fast-charging-animation/id1643477368) | 4.4 (17) | Free | Entertainment | | [Logic Machine](https://appshunter.io/ios/app/logic-machine/id1232152557) | — | Free | Entertainment | | [Doctor Games: Pet Vet Cat Care](https://appshunter.io/ios/app/doctor-games-pet-vet-cat-care/id814203360) | 4.5 (12,871) | Free | Entertainment | | [Wallpapers & Themes For Screen](https://appshunter.io/ios/app/wallpapers-and-themes-for-screen/id1232044016) | 3.1 (230) | Free | Entertainment | | [Baby Unicorn Girl Math Games](https://appshunter.io/ios/app/baby-unicorn-girl-math-games/id1507311276) | 4.6 (866) | Free | Entertainment | | [Spa Games Salon Makeover Games](https://appshunter.io/ios/app/spa-games-salon-makeover-games/id1620302661) | 4.5 (284) | Free | Entertainment | ## More apps by Riyam Computer Services LLC - [OMZEST Oil Watch](https://appshunter.io/ios/app/omzest-oil-watch/id298046690) - [MiFiles](https://appshunter.io/ios/app/mifiles/id314545247) - [MiDictionary-Pro](https://appshunter.io/ios/app/midictionary-pro/id500543156) All apps by Riyam Computer Services LLC: https://appshunter.io/developer/298046693 --- *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.*