Mercury vs Little Green Button
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Mercury
Control your multi-room audio system remotely. Manage playback, zones, and settings for a seamless listening experience throughout your home.
- Remote control
- Multi-room audio system management
- Zone control
- Playback management
- Settings adjustment
Read full descriptionHide full description
Remote control utility for owners of the Mercury multi-room audio system.
Little Green Button
This safety companion app acts as a panic button and duress alarm system. It allows users to share alerts with a response group and provides access to a management site for managing subscriptions and user keys.
- Panic button functionality
- Duress alarm system
- Share alerts with response group
- Access to management site
- Auto-renewable subscription
- Supports up to 4 additional users
Read full descriptionHide full description
The panic button software designed to help keep people safe; it's the perfect panic alarm system (duress alarm) for any environment that you can rely on and trust. You may purchase an auto-renewing subscription through an In-App Purchase. In purchasing a Little Green Button annual subscription you will be granted access to our service and management site for one year. Your subscription allows you to share your response group key with up to 4 other users across mobile or desktop, who will be able to raise and receive alerts within your personal group. In signing up you agree to both our Terms Of Service & Privacy Policy. For support or any questions please visit our website. • Auto-renewable subscription • 1 year (£199.99) duration • Your subscription will be charged to your iTunes account at confirmation of purchase and will automatically renew (at the duration selected) unless auto-renew is turned off at least 24 hours before the end of the current period. • Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your iTunes Account Settings after purchase • Privacy policy: https://www.littlegreenbutton.com/privacy-policy/ • Terms of service: https://www.littlegreenbutton.com/terms-of-service/
Screenshots
Verdict
The clearest difference is review sentiment: Little Green Button at 100% against Mercury's 0%. Mercury's advantage is in-app purchases (none vs 1) and iOS requirement (8.0 vs 15.6). On price, 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
Both are free to download. Little Green Button sells 1 in-app purchase, starting at $204.99 per year. Mercury asks for nothing beyond the download.
Mercury ships an update every 3 months, Little Green Button every 2 months. The most recent releases landed on October 4, 2026 and October 29, 2026 respectively.
| Parameter | Mercury | Little Green Button |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Subscription |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 8.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 20 MB | 60 MB |
| Age rating | 4+ | 17+ |
| Developer | R Hamilton & Co Ltd. | Little Green Button Limited |
Customer experience
Mercury
Little Green Button
In-app purchases
Mercury
No in-app purchases
Little Green Button
- Annual Subscription (Seed)$204.991 Year
Questions
Is Mercury free?
Is Little Green Button free?
Do Mercury or Little Green Button have ads?
Which is updated more often, Mercury or Little Green Button?
Other comparisons
