Mount Kelvin vs Sannounce
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Mount Kelvin
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Be the master of the indoor ambience around you. Control all of the lights, temperature and AC. Create personalised lighting scenes for the whole room and activate them with one touch. Get accurate, real-time information of air quality, moisture, CO2 levels and set alarms for water leakages. The app also works as a configuration tool. Add new lights, battery-free wireless switches and other devices. REQUIREMENTS In order to use the Mount Kelvin app, you need a Mount Kelvin bridge.
Sannounce
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Sannounce turns your Sonos speakers into a home intercom. Record a quick message on your iPhone or iPad and broadcast it to one room, a few rooms or the whole house. HOLD, TALK, LET GO Hold the mic while you talk and let go to announce, just like a walkie-talkie. Prefer tapping? Switch to tap to talk, or record first and listen before you send. THE MUSIC KEEPS PLAYING On Sonos speakers that support it, the music ducks while your message plays and comes back by itself. Older speakers are paused and restored to what they were playing. NO VOICE ASSISTANT NEEDED Your voice is recorded on your iPhone or iPad, so the speakers don't need a microphone or voice assistant of their own. SAVED ANNOUNCEMENTS Save the ones you use every day ("Dinner's ready!", "Time for school!") and play them again with one tap. Sannounce suggests a name by transcribing your recording on the device. CLEAR VOICE, FUN SOUNDS Music and other background sound are taken out of your recording, so only your voice comes through. A short bird call plays first so everyone knows to listen, and voice effects turn you into a squeaky chipmunk or a deep, booming voice. PRIVATE BY DESIGN Sannounce talks to your speakers directly over your Wi-Fi. No account, no cloud, no server, no tracking. Your voice never leaves your home network. GOOGLE CAST AND APPLE WATCH Sannounce also plays on Google Cast speakers and Chromecast. On those, what's playing stops for the announcement, and the app tells you what stopped. With the Apple Watch app, you talk into your watch and your iPhone plays it on the speakers you picked. REQUIREMENTS โข Sonos or Google Cast speakers on the same Wi-Fi network as your iPhone or iPad โข Local Network and microphone access Sannounce is an independent app. It is not affiliated with, endorsed by or sponsored by Sonos, Inc. or Google LLC. Sonos is a trademark of Sonos, Inc. Google Cast and Chromecast are trademarks of Google LLC.
Screenshots
Verdict
The clearest difference is update cadence: Sannounce at daily against Mount Kelvin's every 2 weeks. Mount Kelvin's advantage is iOS requirement (9.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Mount Kelvin ships an update every 2 weeks, Sannounce daily. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.
| Parameter | Mount Kelvin | Sannounce |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks | Daily โ better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 9.0 โ better | 26.0 |
| Further details โ not scored | ||
| Size | 11 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Mired Hill | Sebastian Marcusson |
In-app purchases
Mount Kelvin
No in-app purchases
Sannounce
No in-app purchases









