# Zulip vs Möbius Sync

The clearest difference is in-app purchases: Zulip at none against Möbius Sync's 1. Zulip also leads on update cadence (monthly vs every 2 months). Möbius Sync's advantage is review sentiment (55% vs 39%) and ratings volume (140 vs 16). On price, rating, ads and monetization model there is nothing between them.

Both are free to download. Möbius Sync sells 1 one-off in-app purchase. Zulip asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 3.7 for Zulip against 3.8 for Möbius Sync. That said, the two scores are not equally well evidenced: Möbius Sync has 140 ratings behind it against 16, so its average is the more settled of the two. Written reviews are what separate them: 39% of Zulip's written reviews are positive against 55% of Möbius Sync's.

Zulip ships an update monthly, Möbius Sync every 2 months. The most recent releases landed on August 21, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Zulip | Möbius Sync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (16 ratings)](https://appshunter.io/ios/app/zulip/id1203036395/reviews) | **[3.8 (140 ratings)](https://appshunter.io/ios/app/mobius-sync/id1539203216/reviews)** |
| Number of ratings | 16 | **140** |
| Positive reviews | 39.3% of reviews | **55.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 44 MB | 23 MB |
| Requires iOS | 15.0 | **14.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Kandra Labs, Inc.](https://appshunter.io/developer/1194159660) | [Pickup Infinity Limited](https://appshunter.io/developer/1118833408) |

## What reviewers say

### Zulip

[App page](https://appshunter.io/ios/app/zulip/id1203036395)

This app provides organized team chat for groups of any size, enabling users to read and respond to messages in context. It helps maintain focus by allowing users to catch up on topics of interest at their own pace. The application is open-source and available as a cloud service or self-hosted solution.

**Highlights:** Organized team chat, Contextual message reading, Topic-based conversations, Focus maintenance, Open-source software, Cloud and self-hosted options

**Features:** Vision Pro support

**In-app purchases:** none


### Möbius Sync

[App page](https://appshunter.io/ios/app/mobius-sync/id1539203216)

Synchronize files between your iOS devices and other Syncthing-supported platforms without relying on cloud storage. Manage multiple folders and remote devices, with options for sandbox or experimental cross-app sandbox syncing.

**Highlights:** File synchronization between iOS and other Syncthing devices, No cloud service required, Supports multiple folders and remote devices, Sync within app sandbox or other app sandboxes (paid), Uses open-source Syncthing engine

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited file sync | $4.99 | one-time |

**What reviewers like**

- ✅ Effective Syncthing implementation for iOS
- 💰 Fair one-time purchase model (no subscription)
- 🔒 Privacy-focused peer-to-peer syncing
- 📱 Good Files app integration
- ⚡ Fast file synchronization when working

**What reviewers complain about**

- 🐛 Outdated internal Syncthing version (1.28 vs 2.x)
- 💸 Aggressive paywall at 20MB free limit
- 🔌 No true background sync (iOS limitation)
- 🚫 Cannot sync iOS Photos app natively
- ⚠️ Inconsistent purchase restoration across devices

**Reported bugs**

- Syncthing version incompatibility with v2.x devices
- Device discovery limited to 1 of 5 paired devices
- Insufficient space errors despite available storage
- Purchase dialog rendering issues on older devices
- Purchase not persisting after app reinstall

**Requested features**

- Update internal Syncthing to version 2.x or higher
- iOS Photos app sync capability (at least one-way upload)
- True background synchronization
- Selective folder sync to save storage space
- File Provider extension for deeper iOS integration


## Frequently asked questions

### Is Zulip free?

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

### Is Möbius Sync free?

Möbius Sync is free to download, with in-app purchases available.

### Which has better reviews, Zulip or Möbius Sync?

Möbius Sync is rated higher. Zulip averages 3.7 out of 5 from 16 ratings, while Möbius Sync averages 3.8 from 140 ratings.

### Do Zulip or Möbius Sync have ads?

Neither Zulip nor Möbius Sync shows ads.

### Which is updated more often, Zulip or Möbius Sync?

Zulip ships an update monthly, and Möbius Sync every 2 months. Most recently, Zulip was updated on August 21, 2026 and Möbius Sync on September 25, 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.*