Sync Calling vs TO_MO by 21C@JC
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sync Calling
A private communication tool for church members, featuring photo and video sharing, voice recording, and cloud file storage. It also serves as a platform for church announcements and integrates with a forum app.
- Photo and video sharing
- Voice recording and attachments
- Cloud file storage (sync-file)
- Church announcements and bulletins
- Integration with Zion forum app
- Account login required
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Sync Calling 是一個錫安教會會友專用通訊軟件。 當中包括相片、影片分享功能。 簡易錄音及錄音附件功能。 附設sync-file 雲端檔案運作，可以將過往曾經分享的檔案儲存。 也是教會通告及公佈平台。 更可與zion forum app 互通。 * 此軟件需要帳戶登入，軟件亦只開放給本會教友使用。
TO_MO by 21C@JC
A social networking app designed for young people to share daily life and interests with friends. It connects users with peers and organizes various activities through youth service centers across Hong Kong, offering access to resources and exclusive features.
- Connect with peers
- Share daily life and interests
- Organize and discover youth activities
- Access youth center resources
- Exclusive E-passport for center access
- Explore cross-district events
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TO_MO 是一個年輕人的專屬社群App，無論是生活日常、興趣喜好，有事冇事上 TO_MO 都總有朋友仔一齊分享一齊試！ TO_MO 除了聚集同齡人， 36 間綜合青少年服務中心會同年輕人一起舉辦各類「啱你vibe」活動，無論是香港、九龍、新界，總有一樣在你身邊。即使附近活動不合心意，上 TO_MO 亦可以即時探索跨區活動, 總會搵到啱你心水~ 望完玩完，仲可以留Post 分享感想。 以為就咁就完？梗係唔只啦！ 成為 TO_MO 會員，還可以享用36間青年中心的資源，學習、打機、玩桌遊？隨時輕易找到伴，找到合適場地！而平台亦有會員專用 E-passport，一人一個 QR code，全港中心隨意通行，非常方便！ 立即成為 TO_MO 一份子，隨時隨地搵到朋友仔，一齊玩，一齊傾，一齊試！
Screenshots
Verdict
The clearest difference is review sentiment: Sync Calling at 67% against TO_MO by 21C@JC's 56%. On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Sync Calling ships an update every 3 weeks, TO_MO by 21C@JC every 2 weeks. The most recent releases landed on October 11, 2026 and October 15, 2026 respectively.
| Parameter | Sync Calling | TO_MO by 21C@JC |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (2 ratings) — better | — |
| Positive reviews | 66.7% of reviews — better | 55.6% of reviews |
| Number of ratings | 2 — better | — |
| Update frequency | Every 3 weeks | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 15.6 |
| Further details — not scored | ||
| Size | 31 MB | 130 MB |
| Age rating | 4+ | 4+ |
| Developer | ZionDaily.com | The Hong Kong Federation of Youth Groups |
Customer experience
Sync Calling
TO_MO by 21C@JC
In-app purchases
Sync Calling
No in-app purchases
TO_MO by 21C@JC
No in-app purchases
