imp™ vs Sound Shield WATCH
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
imp™
This app works with a smart home device to filter unwanted landline calls, allowing only desired contacts to reach you. It also functions as a remote answering machine for your landline, letting you manage voicemails from anywhere.
- Real-time call filtering
- Greenlist Technology™
- Syncs iPhone contacts
- Remote voicemail access
- Do Not Disturb mode
- Invite others to landline
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Use of the imp app™ requires our WiFi-enabled imp box™ (sold separately). Meet imp™ - the smart, simple, and easy solution for making landline spam calls go away. Powered by our Greenlist Technology™, the imp app, and imp box work together to eliminate all unwanted landline calls. This real-time call-filtering technology silently handles the calls you don't want to deal with, freeing you up to focus on welcoming only those calls you actually want to receive. With your imp box in place, the app gives your landline phone superpowers. After seamlessly syncing your iPhone's contacts with your landline at setup, you are ready to receive calls only from people you want to talk to. That means no more spam, scam, telemarketing, robo, or any other unwanted caller of any shape or size. imp is the first smart home answering machine, allowing you to receive and listen to your home's landline voicemails no matter where in the world you are. imp-sters also have the ability to put their landline into "Do Not Disturb" mode, as well as invite others to your landline. Created by our team of experts from the fields of old-school landline technology, secure networks, and modern telecommunications, imp is a new approach to your landline phone experience. With imp you now have the power to welcome calls by design, and silence the rest. To learn more about imp, visit us at: www.joinimp.com
Sound Shield WATCH
This app emits high-frequency sounds to deter mosquitoes. It's designed to be a convenient insect repellent, though some younger users may be able to hear the frequencies.
- High-frequency sound generation
- Mosquito deterrence
- Convenient insect repellent
- Works on watch and iPhone
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SoundShield turns your Apple Watch into a simple, always-ready high-frequency sound tool designed to help keep mosquitoes away. With one tap, SoundShield starts a continuous high-frequency sound that mosquitoes may dislike. The sound keeps playing in the background until you stop it, making it easy to use when you are outdoors, commuting, taking a break, or spending time in places where mosquitoes may be around. The sound is a high-frequency tone that many people may not hear clearly. However, some people, especially younger people under their thirties, may be able to hear it. How to use SoundShield: Open SoundShield on your Apple Watch. Choose a mode: Daily, Transit, or Rest. Adjust the shield volume if needed. Tap Start Shield to begin playback. Lower your wrist or switch apps. The sound can continue in the background. Tap Stop Shield when you want to end the session. Optionally set an auto-stop timer for 5, 15, 30, or 60 minutes. Choose the mode that fits your moment: Daily provides a balanced high-frequency sound for everyday use. Transit offers a stronger setting for outdoor or commuting situations. Rest gives you a softer, lower-volume session for quieter moments. You can also track your session count and total listening time, reset your stats anytime, and add the SoundShield complication to your watch face for quick access whenever you need it. Features: Continuous high-frequency sound playback until you tap Stop Background audio support Daily, Transit, and Rest modes Adjustable shield volume Optional 5, 15, 30, or 60 minute auto-stop timer Session count and total listening time Watch face complication for quick launch No account required SoundShield is built for Apple Watch: quick to start, simple to stop, and always close when you want to play a high-frequency sound that may help keep mosquitoes away.
Screenshots
Verdict
The clearest difference is review sentiment: imp™ at 100% against Sound Shield WATCH's 50%. imp™ also leads on price (Free vs $4.99) and rating (5.0 vs 4.5). On ads, in-app purchases, device support and iOS requirement 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
imp™ is free to download; Sound Shield WATCH costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
imp™ holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: imp™ has 12 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 100% of imp™'s written reviews are positive against 50% of Sound Shield WATCH's.
imp™ ships an update every 2 months, Sound Shield WATCH every 30 months. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.
| Parameter | imp™ | Sound Shield WATCH |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 5.0 (12 ratings) — better | 4.5 (2 ratings) |
| Positive reviews | 100.0% of reviews — better | 50.0% of reviews |
| Number of ratings | 12 — better | 2 |
| Update frequency | Every 2 months — better | Every 30 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Requires iOS | 12.1 — better | 13.0 |
| Further details — not scored | ||
| Size | 36 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Its My Phone, Inc | HOBEEC |
Customer experience
imp™
Sound Shield WATCH
In-app purchases
imp™
No in-app purchases
Sound Shield WATCH
No in-app purchases









