# SyncML PRO 4 — SyncML for Calendar+Contacts

> SyncML client for contacts and calendar synchronization with legacy servers. (iPhone/iPad app by Lukas Zeller.)

- Source: https://appshunter.io/ios/app/syncml-pro-4/id1165983946 (this page in markdown: same URL + `.md`)
- Developer: [Lukas Zeller](https://appshunter.io/developer/299521020)
- Category: Productivity, Business
- Price: $11.99
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 10.0 · 4 MB
- Languages: American English, French (France), German (Germany)
- Released: 2016-12-06
- Data updated: 2026-06-25
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/syncml-pro-4/id1165983946/reviews.md

## What is SyncML PRO 4?

Please read the following desciption before buying this app! 

SyncML PRO 4 is a niche app, suitable only when you need synchronizing contacts and calendar with a server or service which uses a standard called SyncML. The app does not support any other synchronisation technology!

So please buy this app only if you know for sure that SyncML-based synchronisation is really what you need! This may be the case when the IT people of your organisation say so, and maybe even explicitly recommend using SyncML PRO to synchronize calendars and contacts. In any case, please realize that for using this app, you need to know the URL of your syncml server, the login user to use, and the so called server paths for contacts/calendar. Only the provider of the SyncML service knows these details and can support you in establishing sync with his SyncML server. We as makers of the SyncML client app cannot! 

By now, SyncML is a legacy standard. It was invented in 2000, and many of that time's feature phones did support it. Since then, it has been largely superseded by other technologies, most notably CalDAV and CardDAV, which iOS supports out of the box without any extra app. But SyncML still exists, and for some older calendaring systems, it may be the only way to synchronize. For those cases, SyncML PRO 4 exists.

SyncML PRO 4 is a rework of the former SyncML PRO app, to allow using SyncML on iOS 10 and later (the original SyncML PRO app only works up to iOS 9). But please note that SyncML PRO 4 does not provide new features over the original SyncML PRO - except for a contact list view with a way to easily assign contacts to groups. Otherwise SyncML PRO 4 just carries the original SyncML PRO functionality forward to make it usable with iOS10 and later.

So now that you are certain SyncML based synchronisation is what you need - here's the summary for SyncML PRO 4:
• based on a mature and extensively interoperability tested SyncML engine, which powers many SyncML client and server products for different platforms (libsynthesis).
• allows synchronizing all or selected iOS calendars to a SyncML compliant server or service in the internet or in the local network.
• can act as SyncML server in the local WiFi network (e.g. to keep really old mobiles in sync with an iOS device)
• has built-in month, day, week and list views for the iOS calendar (same as in original SyncML PRO)
• has a contacts list for the iOS contacts, and allows quickly assigning/removing contact group membership (that's a new feature in SyncML PRO 4)

Please visit the plan44.ch web page (see support link below) for support and FAQ, as well as documentation for download.

## Key features

- SyncML contacts and calendar synchronization
- Connects to SyncML compliant servers
- Acts as a local SyncML server
- Calendar month, day, week, and list views
- Contact group assignment feature


## Frequently asked questions about SyncML PRO 4

### What is SyncML PRO 4 used for?

SyncML PRO 4 is used to synchronize contacts and calendars with servers or services that utilize the SyncML standard. It is specifically designed for situations where other synchronization technologies like CalDAV or CardDAV are not supported or required.

### Does SyncML PRO 4 support other synchronization technologies besides SyncML?

No, SyncML PRO 4 exclusively supports the SyncML synchronization technology. It does not support any other synchronization methods, and users should only purchase it if SyncML is their required solution.

### What information do I need to set up SyncML PRO 4?

To use SyncML PRO 4, you will need the URL of your SyncML server, your login username, and the specific server paths for contacts and calendars. This information is provided by the SyncML service provider.

### Is SyncML PRO 4 suitable for modern iOS devices?

SyncML PRO 4 is designed to work on iOS 10 and later. It is a rework of a previous version to ensure compatibility with modern iOS operating systems, carrying forward its core SyncML functionality.

### What are the new features in SyncML PRO 4 compared to the original SyncML PRO?

SyncML PRO 4's primary new feature is a contact list view that allows for easy assignment of contacts to groups. Otherwise, it carries forward the functionality of the original app for use on newer iOS versions.

### Can SyncML PRO 4 act as a server?

Yes, SyncML PRO 4 can act as a SyncML server within a local WiFi network. This capability can be useful for keeping older mobile devices synchronized with an iOS device.

### What is the update frequency for SyncML PRO 4?

SyncML PRO 4 was last updated on April 26, 2024, indicating active development and maintenance. Users can expect ongoing support and potential future updates.

### Is SyncML PRO 4 free to use?

SyncML PRO 4 is a paid application, priced at $11.99. It does not contain advertisements or in-app purchases.

## Version history (last 5 releases)

### 4.7 — 2024-04-26

Updated for current operation system versions and tools

### 4.6 — 2022-11-28

Fixed a problem that could cause sync to fail in iOS16 (caused by removing alarms from calendar items)

### 4.5 — 2021-03-02

Updated for iOS14

### 4.4 — 2019-12-13

Bugfixes for iOS13, support for dark mode

### 4.1 — 2017-09-06

fixed bug that could crash the app when sync was configured to automatically add calendars from vCalendar CATEGORIES

## Apps similar to SyncML PRO 4

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Contacts Mover Pro](https://appshunter.io/ios/app/contacts-mover-pro/id1321249676) | 4.7 (535) | $5.99 | Productivity |
| [Contacts Sync Pro](https://appshunter.io/ios/app/contacts-sync-pro/id686378579) | 4.7 (787) | $12.99 | Productivity |
| [MCBackup Pro - Contacts Backup](https://appshunter.io/ios/app/mcbackup-pro-contacts-backup/id1406717706) | 4.8 (116) | $3.99 | Productivity |
| [Dextr - Personal CRM](https://appshunter.io/ios/app/dextr-personal-crm/id6462423477) | 5.0 (35) | Free | Productivity |
| [Sphereify](https://appshunter.io/ios/app/sphereify/id6740837552) | 5.0 (3) | Free | Productivity |
| [SyncGene Sync Contact Calendar](https://appshunter.io/ios/app/syncgene-sync-contact-calendar/id1133538068) | 1.9 (20) | Free | Productivity |

## More apps by Lukas Zeller

- [Ziit](https://appshunter.io/ios/app/ziit/id429177478)
- [Tasks+Cal+Sync 4](https://appshunter.io/ios/app/tasks-plus-cal-plus-sync-4/id1166018485)
- [SyncML LITE 4](https://appshunter.io/ios/app/syncml-lite-4/id1170925516)
- [LocalSites](https://appshunter.io/ios/app/localsites/id1490761770)
- [p44btdmx](https://appshunter.io/ios/app/p44btdmx/id1545043495)

All apps by Lukas Zeller: https://appshunter.io/developer/299521020

## Related topics

[syncml lite 4](https://appshunter.io/ios/topics/syncml-lite-4) · [lukas zeller](https://appshunter.io/ios/topics/lukas-zeller)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-25.*