# Sync Calling vs TO_MO by 21C@JC

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.

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.

## The numbers

| Metric | Sync Calling | TO_MO by 21C@JC |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (2 ratings)](https://appshunter.io/ios/app/sync-calling/id478879522/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | **66.7% of reviews** | 55.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 31 MB | 130 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ZionDaily.com](https://appshunter.io/developer/478879525) | [The Hong Kong Federation of Youth Groups](https://appshunter.io/developer/527486933) |

## What reviewers say

### Sync Calling

[App page](https://appshunter.io/ios/app/sync-calling/id478879522)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### TO_MO by 21C@JC

[App page](https://appshunter.io/ios/app/to-mo-by-21cjc/id6739194540)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Sync Calling free?

Sync Calling is free to download, with no in-app purchases.

### Is TO_MO by 21C@JC free?

TO_MO by 21C@JC is free to download, with no in-app purchases.

### Do Sync Calling or TO_MO by 21C@JC have ads?

Neither Sync Calling nor TO_MO by 21C@JC shows ads.

### Which is updated more often, Sync Calling or TO_MO by 21C@JC?

Sync Calling ships an update every 3 weeks, and TO_MO by 21C@JC every 2 weeks. Most recently, Sync Calling was updated on October 11, 2026 and TO_MO by 21C@JC on October 15, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*