Comparison

One Calendar vs PLN Open

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

One Calendar

All calendars in ONE place!

Free

📊 Productivity

★ 4.821K ratingsView app →

About

One Calendar

Consolidate all your digital calendars into a single, easy-to-read view. Manage appointments, events, and birthdays from various providers like Google, Outlook, iCloud, and more, all within one application.

Highlights

Integrates multiple calendar providers
Easy-to-read overview
Manage appointments and events
View birthdays
Cross-platform availability

Features

Read full description

The most popular app to view all your calendars like Google, Live, Outlook, iCloud, Exchange, Office365, Yahoo, Nextcloud, Synology, GMX, Mailbox.org, ownCloud and more. OneCalendar integrates all your calendars into an easy-to-read overview. View and manage all your appointments, events and birthdays. OneCalendar is available on all platforms.

About

PLN Open

Features

Read full description

PLN Open è l'app ufficiale per la consultazione delle mappe e dei dati della Piattaforma Logistica Nazionale, il sistema digitale promosso dal Ministero delle Infrastrutture e dei Trasporti.

Screenshots

One Calendar4 screens

PLN Open4 screens

Verdict

The call

The clearest difference is in-app purchases: PLN Open at none against One Calendar's 1. PLN Open also leads on update cadence (every 3 days vs fortnightly). On price, ads, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. One Calendar sells 1 one-off in-app purchase. PLN Open asks for nothing beyond the download.

UpkeepUpdate frequency

One Calendar ships an update fortnightly, PLN Open every 3 days. The most recent releases landed on October 26, 2026 and October 15, 2026 respectively.

Scorecard2 real differences · 8 level

One Calendar versus PLN Open: the parameters behind the verdict, then further details
Parameter	One Calendar	PLN Open
Price	Free	Free
Rating	4.8 (21K ratings) — better	—
Positive reviews	80.7% of reviews	—
Number of ratings	21K — better	—
Update frequency	Fortnightly	Every 3 days — better
Ads	No	No
In-app purchases	Yes	No — better
Monetization	Free with in-app purchases	—
Devices	iPhone, iPad, iPod, Mac — better	iPhone, iPad, iPod
Requires iOS	15.0	15.0
Further details — not scored
Size	89 MB	21 MB
Age rating	12+	4+
Developer	Code Spark	Ministero delle Infrastrutture e dei Trasporti

Bugs and requests

One Calendar

Reported bugs

5 issues

Sync errors
Unresponsive buttons
Incorrect time zone display
Duplicate events
Inability to delete future occurrences of recurring events

Requested features

6 requests

Multiple reminders for events
Ability to edit recurring events
Option to change event calendar after creation
Printing support
More customization options

Show 1 more

Widgets for better visibility

PLN Open

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

One Calendar

One-time1

OneCalendar premium$5.99

None

PLN Open

No in-app purchases

Questions

Is One Calendar free?

One Calendar is free to download, with in-app purchases available.

Is PLN Open free?

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

Do One Calendar or PLN Open have ads?

Neither One Calendar nor PLN Open shows ads.

Which is updated more often, One Calendar or PLN Open?

One Calendar ships an update fortnightly, and PLN Open every 3 days. Most recently, One Calendar was updated on October 26, 2026 and PLN Open on October 15, 2026.