# Tasks+Cal+Sync 4 — Tasks+Calendar with SyncML

> SyncML client for contacts, tasks, and calendars on iOS. (iPhone/iPad app by Lukas Zeller.)

- Source: https://appshunter.io/ios/app/tasks-plus-cal-plus-sync-4/id1166018485 (this page in markdown: same URL + `.md`)
- Developer: [Lukas Zeller](https://appshunter.io/developer/299521020)
- Category: Productivity, Utilities
- Price: $14.99
- Rating: 1.00/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 10.0 · 8 MB
- Languages: American English, French (France), German (Germany)
- Released: 2017-09-06
- Data updated: 2026-07-04
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/tasks-plus-cal-plus-sync-4/id1166018485/reviews.md

## What is Tasks+Cal+Sync 4?

Please read the following desciption before buying this app! 

Tasks+Cal+Sync 4 is a niche app, suitable only when you need synchronizing contacts, tasks 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 Tasks+Cal+Sync to synchronize calendars, tasks 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/tasks/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 Since then, it has been largely superseded by other technologies, most notably CalDAV and CardDAV, which iOS supports out of the box without any extra app.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, Tasks+Cal+Sync 4 exists.

Tasks+Cal+Sync 4 is a rework of the former Tasks+Cal+Sync app, to allow using SyncML on iOS 10 and later (the original Tasks+Cal+Sync app only works up to iOS 9). But please note that Tasks+Cal+Sync 4 does not provide new features over the original Tasks+Cal+Sync - except for a contact list view with a way to easily assign contacts to groups. Otherwise Tasks+Cal+Sync 4 just carries the original Tasks+Cal+Sync 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 Tasks+Cal+Sync 4:
• based on a mature and extensively interoperability tested SyncML engine, which powers many SyncML client and server products for different platforms (libsynthesis).
• synchronizes app-internal calendar (not the iOS calendar! If you want that, have a look at "SyncML PRO 4"), app-internal tasks (not iOS reminders!) and iOS contacts 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 tasks, month, day, week and list views for the iOS calendar (same as in original Tasks+Cal+Sync)
• has a contacts list for the iOS contacts, and allows quickly assigning/removing contact group membership (that's a new feature in Tasks+Cal+Sync 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 synchronization for contacts, tasks, and calendars
- App-internal calendar and task management
- iOS contact group assignment
- Acts as a local SyncML server
- Month, day, week, and list calendar views


## Frequently asked questions about Tasks+Cal+Sync 4

### What is SyncML and why would I need Tasks+Cal+Sync 4?

SyncML is a legacy synchronization standard from 2000, primarily used by older feature phones and some enterprise systems. You would need Tasks+Cal+Sync 4 if your organization's IT department specifically requires SyncML for synchronizing calendars, tasks, and contacts, as it's often the only method for certain older calendaring systems.

### Does Tasks+Cal+Sync 4 sync with the native iOS Calendar or Reminders?

No, Tasks+Cal+Sync 4 synchronizes its own app-internal calendar and tasks. It does not sync with the native iOS Calendar or iOS Reminders. For iOS Calendar synchronization via SyncML, you would need to look at a different application.

### What information do I need to set up synchronization with Tasks+Cal+Sync 4?

To set up synchronization, you will need the URL of your SyncML server, your login username, and the specific server paths for contacts, tasks, and calendars. This information is provided by the SyncML service provider.

### Can Tasks+Cal+Sync 4 act as a server?

Yes, Tasks+Cal+Sync 4 can act as a SyncML server within your local WiFi network. This feature is useful for keeping older mobile devices synchronized with your iOS device.

### What are the main differences between Tasks+Cal+Sync 4 and the original Tasks+Cal+Sync?

Tasks+Cal+Sync 4 is a rework of the original app to support iOS 10 and later. The primary new feature in version 4 is a contact list view that allows for easy assignment of contacts to groups. Otherwise, it carries forward the original functionality.

### How often is Tasks+Cal+Sync 4 updated?

The app was last updated on April 27, 2024, indicating active development and maintenance. The latest version is 4.6.

### What devices is Tasks+Cal+Sync 4 compatible with?

Tasks+Cal+Sync 4 is compatible with iPhone, iPad, and iPod devices. It requires iOS 10 or later.

### What is the price of Tasks+Cal+Sync 4?

Tasks+Cal+Sync 4 is a paid application priced at $14.99. There are no in-app purchases or subscriptions mentioned.

## Version history (last 5 releases)

### 4.6 — 2024-04-27

Updated for current operation system versions and tools

### 4.5 — 2021-03-02

Updated for iOS14

### 4.4 — 2019-12-13

Bugfixes for iOS13, support for dark mode

### 4.2 — 2017-10-20

• fixed bug that sometimes made entering new events not work correctly
• now can backup and restore internal calendar and tasks data (via Files app)

### 4.1 — 2017-09-06

No release notes.

## Apps similar to Tasks+Cal+Sync 4

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Reminders: To Do List & Widget](https://appshunter.io/ios/app/reminders-to-do-list-and-widget/id1662218674) | 4.5 (97) | Free | Productivity |
| [Calendar Op.2: Planner & Diary](https://appshunter.io/ios/app/calendar-op2-planner-and-diary/id1097430896) | 4.7 (13,279) | Free | Productivity |
| [2Do - Todo List, Tasks & Notes](https://appshunter.io/ios/app/2do-todo-list-tasks-and-notes/id303656546) | 4.7 (3,695) | $9.99 | Productivity |
| [Smart Tasks - Lists Made Easy](https://appshunter.io/ios/app/smart-tasks-lists-made-easy/id1498145730) | 4.7 (4,410) | Free | Productivity |
| [SyncGene Sync Contact Calendar](https://appshunter.io/ios/app/syncgene-sync-contact-calendar/id1133538068) | 1.9 (20) | Free | Productivity |
| [BusyCal: Calendar & Tasks](https://appshunter.io/ios/app/busycal-calendar-and-tasks/id1035689743) | 4.7 (4,355) | $9.99 | Productivity |

## More apps by Lukas Zeller

- [Ziit](https://appshunter.io/ios/app/ziit/id429177478)
- [SyncML PRO 4](https://appshunter.io/ios/app/syncml-pro-4/id1165983946)
- [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

[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 2026-07-04.*