iSmart Light vs DuoSync
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
iSmart Light
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iSmart Light is a smart App for you to control and manage lights in your home. There are a variety of lighting modes that covers the range from fun to functional, making your life easier, fun and smarter. *Rooms and Groups Organize and control your lights by Rooms or Groups for easy control *Scene and Automation Control multiple lights with one tap. Or the lights run automatically on the basis of time, weather, device, etc. *Brightness and colour adjustment Adjust the brightness and RGB LED colour as desired *Plan Schedule your lights to perform certain lighting effects, including schedule, light to sleep, light to wake-up and circadian rhythm. *Home member management All your settings can be shared with your family, friends and even guests. *Remote control Easily monitor and control your lights anytime and anywhere *Voice control Support Amazon Alexa, Google Assistant and TmallGenie.
DuoSync
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Answer in private. Reveal together. Find out what you never asked. One question a day. Two private answers. One reveal. Five minutes that turn into the conversation you have been meaning to have. NEW: THE ENVELOPE Write your first answer, seal it, send the link. Your partner answers before opening yours. Then you both see everything at once. No account needed to start. HOW IT WORKS You both answer the same question, each on your own phone. Nothing shows until you have both answered. Then you reveal together: the surprise, the laugh, the "I never knew that about you." WHAT'S INSIDE ⢠678 questions, each one reviewed for depth and safety ⢠64 themes in 10 universes, from Dreams & Goals to After Dark ⢠A new daily question every morning ⢠3 games for two: Sync Mode (answer, then reveal), The Thread (write a story turn by turn), Read Me (how well do you really know each other?) ⢠Voice notes: hear the tone, the pause, the laugh ⢠Couple Tree: watch it grow from first Sprout to Blooming ⢠Moments: keep your favorite reveals ⢠Weekly letters that sum up your week together FOR EVERY KIND OF "US" ⢠New couples who want to skip months of small talk ⢠Long-distance couples who need more than "how was your day?" ⢠Couples together for years who want to be surprised again PRIVATE BY DESIGN No feed. No public profile. No strangers. Your answers belong to the two of you. DUOSYNC PREMIUM Unlocks all 64 themes, every game, voice notes and weekly letters. One subscription covers both partners. ⢠Weekly: $1.99/week ⢠Monthly: $4.99/month, 7-day free trial ⢠Annual: $44.99/year, 7-day free trial (save 24% vs monthly) Payment is charged to your Apple ID at confirmation. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel in Settings > Apple ID > Subscriptions Privacy Policy: https://duosync.app/privacy Terms of Use: https://duosync.app/terms
Screenshots
Verdict
The clearest difference is in-app purchases: iSmart Light at none against DuoSync's 3. iSmart Light also leads on update cadence (every 2 months vs every 5 months) and iOS requirement (11.0 vs 15.1). On price, ads and device support there is nothing between them.
Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS
Both are free to download. DuoSync sells 3 in-app purchases, starting at $1.99 per 7 days. iSmart Light asks for nothing beyond the download.
iSmart Light ships an update every 2 months, DuoSync every 5 months. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.
| Parameter | iSmart Light | DuoSync |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months ā better | Every 5 months |
| Ads | No | No |
| In-app purchases | No ā better | Yes |
| Devices | iPhone, iPad, iPod ā better | iPhone, iPod |
| Requires iOS | 11.0 ā better | 15.1 |
| Further details ā not scored | ||
| Size | 217 MB | 99 MB |
| Age rating | 4+ | 17+ |
| Developer | Shenzhen Topband Software Technology Co., Ltd | Three Four Sarl |
In-app purchases
iSmart Light
No in-app purchases
DuoSync
- DuoSync Weekly$1.997 Days
- DuoSync Monthly7 Days trial$4.991 Month
- DuoSync Yearly7 Days trial$44.991 Year









