The aCalendar Insider’s Guide
Everything we know about aCalendar in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
aCalendar
The Insider’s Guide
Android calendar with widgets, tasks and one-time upgrades
Every plan, grade, refund rule and rival among calendar and scheduling apps, read from aCalendar’s own pages.
Made by Tapir Apps GmbH · checked Oct 9, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from aCalendar’s own pages, its app-store listings and our grades. Every fact in it is on aCalendar’s page too, where it is kept up to date. Checked Oct 9, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
2.6
GPA, above 30 of the 74 other calendar and scheduling apps we grade
aCalendar is a calendar app for Android from Tapir Apps, an independent studio in Munich. It uses Android's own calendar storage and sync, so it shows Google, Exchange and CalDAV calendars already set up on the phone, with day, week, month, agenda and year views and eight widgets. The free version carries ads, and tasks, business features, public holidays and extra colors are sold as one-time upgrades or all together in the separate aCalendar+ app.
To get you started, here are 9 things to know about aCalendar, taken from its own pages and our grades.
Swipe up and down for time, sideways for views.
- 1
Best for an Android calendar you pay for once
It's Android only, the maker says no iOS, web or PC version is planned, and upgrades bought in the free app can't be shared with family.
- 2
What it costs
Paid plans start at $2.49 to $11.99 per one-time in-app upgrade; aCalendar+ is $11.99.
- 3
There is a free plan
Free version with ads: day, week, month, agenda and year views, 8 widgets, multi-select, printing and ICS or CSV export. Tasks, business features, public holidays and extra colors are paid upgrades.
- 4
It runs on Android
Android.
- 5
Day, week, month, agenda and year views
Swipe vertically to move through time and horizontally to switch views. Day and week views can show a mini month or a graphical week overview alongside.
- 6
Eight home screen widgets
Widgets include agenda, date, day and week layouts and a birthday widget added in version 2.9. Accent colors can be set per widget with the Colors upgrade.
- 7
Tasks next to events
The Tasks upgrade shows to-dos on their due dates in day, week and month views, with subtasks and a tasks widget. It works with Google Tasks, Microsoft To Do, CalDAV through Tasks.org, and local lists.
- 8
A 2.6 GPA, above 30 of 74
That is against the other calendar and scheduling apps we grade, on value, the free plan, features, ease of use and platforms.
- 9
Keep it
The plain part of aCalendar you could make: calendar and tasks. What surrounds it you could not. The 3 things listed below take a company, not a weekend.
aCalendar at a glance
- Pricing
- Free plan, from $2.49 to $11.99 per one-time in-app upgrade; aCalendar+ is $11.99
- Free plan
- Yes
- Free trial
- None stated
- Runs on
- Android
- Made by
- Tapir Apps GmbH, since 2011
- Category
- Calendar & Scheduling
- Our grade
- 2.6 GPA, good
The report card
Best for an Android calendar you pay for once
aCalendar is an Android calendar that reads the Google, Exchange and CalDAV calendars already on your phone, free with ads, with five views and 8 widgets. Tasks, public holidays, business features and extra colors are paid upgrades from $2.49 each, or $11.99 for aCalendar+. It's Android only, the maker says no iOS, web or PC version is planned, and upgrades bought in the free app can't be shared with family.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | A | One-time payments, from $2.49 for a single upgrade to $11.99 for aCalendar+ with every upgrade in it. The middle of this category charges $6 a month, so the full set costs about two months of that, once. |
| Free plan and trial | B | The free app has all five views, 8 widgets, multi-select, printing and ICS or CSV export, with ads, at most one a day by the maker's count. Tasks, public holidays, business features and the wider colors are paid. |
| Features | C | Five views, eight widgets, recurrences, birthdays, printing to PDF and export to ICS or CSV, with tasks and attendee management as paid upgrades. It's a front end on Android's own sync, a smaller job than this category's, and runs no servers of its own. |
| Ease of use | B | No rating on record. There's nothing to set up: it reads the Google, Exchange and CalDAV calendars Android already syncs, so there's no new account and no import. Swipe up and down for time, sideways for views. |
| Platforms and integrations | D | One operating system. Android, and the maker says plainly there's no iOS, web or PC version and none is planned, so your laptop and anyone's iPhone are out. It does read Google, Exchange and CalDAV accounts through Android's sync. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who aCalendar is for
- Fits if you're on Android only and would rather pay once than every month
- Works for people who keep to-dos in Google Tasks or Microsoft To Do, once they buy the Tasks upgrade
Who it is not for
- Skip it if you also use an iPhone or a computer: it's Android only, and the maker says no other version is planned
- Tight if you're staying free: it shows ads, and tasks, public holidays and extra colors are paid upgrades
- Watch out: attendees, free or busy status and work profiles sit in the paid Business Features upgrade
- Not for you if you share purchases with family, as only the separate $11.99 aCalendar+ app works with Family Library
- Watch out: licenses are tied to your store account and can't move between Google Play and Huawei AppGallery
Good to know
Good for
- Android users who want a full calendar without a subscription
- People who want Google Tasks or Microsoft To Do lists inside their calendar
- Anyone who prefers to buy only the upgrades they need
Worth knowing
- Android only. The vendor states there is no iOS, web or PC version and that none is planned.
- The free version shows ads, and tasks, attendees, profiles, public holidays and the wider color choices all need a paid upgrade.
- In-app upgrades cannot be shared through Google Play Family Library; only the separate aCalendar+ app can.
- Licenses are tied to the store account and cannot be moved between Google Play and Huawei AppGallery.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
$2.49 one-time
To start. There is a free plan too
aCalendar has a free plan. Paid plans start at $2.49 to $11.99 per one-time in-app upgrade; aCalendar+ is $11.99.
Tasks, public holidays, business features and the wider colors are paid.
aCalendar
$0
All calendar views, 8 widgets, flexible recurrences, birthdays, moon phases, printing and export. Shows ads, at most one a day according to the vendor.
In-app upgrades
$2.49 - $11.99
one-time payment per item on Google Play
Ad-free, Tasks, Business Features, Colors and Holidays bought individually inside the free app. Not shareable through Family Library.
aCalendar+
$11.99
one-time purchase on Google Play
A separate paid app with every upgrade included and no ads. It can be shared through Google Play Family Library.
The free plan
Free version with ads: day, week, month, agenda and year views, 8 widgets, multi-select, printing and ICS or CSV export. Tasks, business features, public holidays and extra colors are paid upgrades.
Read from play.google.com on Oct 9, 2026.
Ways to pay less
Other savings
Family Library sharing for aCalendar+
Bought as a paid app after July 2, 2016, aCalendar+ can be shared with up to 5 family members through Google Play Family Library. In-app upgrades are not eligible.
Stated on acalendar.tapirapps.de
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Android
Android calendar with widgets, tasks and one-time upgrades. Here is what it does, as its own site describes it, and what it covers: one-time purchase, tasks, calendar.
It's a front end on Android's own sync, a smaller job than this category's, and runs no servers of its own.
- Day, week, month, agenda and year views
- Swipe vertically to move through time and horizontally to switch views. Day and week views can show a mini month or a graphical week overview alongside.
- Eight home screen widgets
- Widgets include agenda, date, day and week layouts and a birthday widget added in version 2.9. Accent colors can be set per widget with the Colors upgrade.
- Tasks next to events
- The Tasks upgrade shows to-dos on their due dates in day, week and month views, with subtasks and a tasks widget. It works with Google Tasks, Microsoft To Do, CalDAV through Tasks.org, and local lists.
- Business features
- An upgrade adds attendee management, linking contacts to events, free or busy status, private events, and profiles that separate work and personal calendars.
- Print and export
- Calendar views can be printed or exported as PDF or PNG, and events exported as ICS or CSV files. Multi-select applies an action to several events at once.
- Uses Android's calendar sync
- The app runs no servers of its own. It reads and writes the calendars Android syncs, including Google Calendar, Microsoft Exchange accounts and CalDAV servers, plus local calendars.
Where it runs
- Android
What it works with
- Google Calendar
- Google Tasks
- Microsoft To Do
- Microsoft Exchange
- Tasks.org
- DAVx5
- Nextcloud
- Synology
aCalendar is made by Tapir Apps GmbH, and has been around since 2011.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
30/74
Other calendar and scheduling apps it is graded above
aCalendar's GPA of 2.6 is higher than 30 of the 74 other calendar and scheduling apps we grade, and level with 13.
It stands best on value for money (A, above 45 of 74) and worst on platforms and integrations (D, above 0).
Each grade against the category
Every bar is all 75 calendar and scheduling apps we grade, cut by the letter each got. aCalendar’s own letter is outlined.
- AValue for moneyAbove 45 of 74
- BFree plan and trialAbove 41 of 74
- CFeaturesAbove 3 of 74
- BEase of useAbove 32 of 74
- DPlatforms and integrationsAbove 0 of 74
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
Keep it
The plain part of aCalendar you could make: calendar and tasks. What surrounds it you could not. The 3 things listed below take a company, not a weekend.
It costs $2.49, paid once.
What you could make
- Calendar and tasks: an app builder makes these well.
What you could not
- A real app for Android. Something home-made would be a web page.
- It plugs into other products, Google Calendar, Google Tasks and Microsoft To Do among them.
- Hooks into the device itself: widgets.
What this rests on. aCalendar’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
Business Calendar 2, DigiCal, CalenGoo, One Calendar and Google Calendar
The 5 tools aCalendar is most often weighed against, with where each one differs from it.
- 2.2GPA
Business Calendar 2
Free plan · from $1.49
Android calendar and task app with widgets and a Pro upgrade.
- aCalendar can be bought with a one-time purchase.
- Business Calendar 2 also covers templates.
- 2.6GPA
DigiCal
Free plan · from $5.49 one-time
Android calendar with seven views, widgets and weather forecasts.
- aCalendar also covers tasks.
- 2.8GPA
CalenGoo
Free trial · from $5.99 one-time
Highly configurable calendar and task app sold as a one-time purchase.
- aCalendar has a free plan. CalenGoo does not, though it has a free trial.
- Only CalenGoo lists iOS, Windows, macOS and Linux apps.
- CalenGoo also covers templates and natural-language input.
- 3.2GPA
One Calendar
Free plan · from $5.99 one-time
One view of all your calendars on Android, Apple and Windows.
- Only One Calendar lists iOS, macOS and Windows apps.
- aCalendar also covers tasks.
- 3.4GPA
Google Calendar
Free plan · from $7/mo
Online calendar from Google, free with a personal account.
- Only Google Calendar lists a web app.
- Only Google Calendar lists an iOS app.
- aCalendar can be bought with a one-time purchase.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
12
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is aCalendar free?
aCalendar has a free plan. Free version with ads: day, week, month, agenda and year views, 8 widgets, multi-select, printing and ICS or CSV export.
How much does aCalendar cost?
aCalendar lists 3 plans. aCalendar: $0. In-app upgrades: $2.49 - $11.99 one-time payment per item on Google Play. aCalendar+: $11.99 one-time purchase on Google Play.
What platforms does aCalendar work on?
aCalendar is available on Android.
Does aCalendar offer any discounts?
aCalendar publicly lists the following: Family Library sharing for aCalendar+.
Does aCalendar have an iPhone app?
No iPhone app was listed when its pages were read on Oct 9, 2026. aCalendar is listed for Android.
Does aCalendar have a Windows app?
No Windows app was listed when its pages were read on Oct 9, 2026. aCalendar is listed for Android.
Is aCalendar open source?
aCalendar is not described as open source on its own site, as read on Oct 9, 2026.
What does aCalendar integrate with?
aCalendar's listing names Google Calendar, Google Tasks, Microsoft To Do, Microsoft Exchange, Tasks.org, DAVx5, Nextcloud and Synology.
Who makes aCalendar?
aCalendar is made by Tapir Apps GmbH. It dates from 2011.
What are the alternatives to aCalendar?
The closest alternatives to aCalendar in our directory are Business Calendar 2, DigiCal, CalenGoo, One Calendar and Google Calendar.
How does aCalendar compare with other calendar and scheduling apps?
aCalendar's GPA of 2.6 is higher than 30 of the 74 other calendar and scheduling apps we grade, and level with 13.
Could I make my own version of aCalendar?
The plain part of aCalendar you could make: calendar and tasks. What surrounds it you could not.
Where this guide comes from
The prices, plans, platforms and features were read from aCalendar’s own pages on Oct 9, 2026, and the grades were given on Oct 10, 2026. Graded from this listing, whose facts were read from Tapir Apps' own pages on 9 October 2026. Also tested with a demo account on 2026-08-09.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by Tapir Apps GmbH. Prices change, so check tapirapps.de before you buy.
- tapirapps.de/en/
- acalendar.tapirapps.de/en/support/home
- acalendar.tapirapps.de/en/support/solutions/articles/36000126848-about-upgrades
- acalendar.tapirapps.de/en/support/solutions/articles/36000058825-ad-free
- acalendar.tapirapps.de/en/support/solutions/articles/36000058826-tasks-feature
- acalendar.tapirapps.de/en/support/solutions/articles/36000009809-business-features
- acalendar.tapirapps.de/en/support/solutions/articles/36000058828-colors
- acalendar.tapirapps.de/en/support/solutions/articles/36000058846-google-play
- acalendar.tapirapps.de/en/support/solutions/articles/36000171906-system-requirements
- acalendar.tapirapps.de/en/support/solutions/articles/36000113436-web-pc-windows-version
- acalendar.tapirapps.de/en/support/solutions/articles/36000061885-company-info
- play.google.com/store/apps/details?id=org.withouthat.acalendar&hl=en_US&gl=US
- play.google.com/store/apps/details?id=org.withouthat.acalendarplus&hl=en_US&gl=US
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
3,189
Tools graded, in 94 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
3,189
tools graded
94
categories
426
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- aCalendar, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/acalendar
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "aCalendar: The Insider's Guide", checked Oct 9, 2026. https://toolgpa.com/tools/acalendar
Know someone choosing between calendar and scheduling apps?
Send them this guide: toolgpa.com/tools/acalendar/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded calendar and scheduling apps after aCalendar, each with an Insider's Guide of its own.
- Calendar & Scheduling Insider's GuideEvery one of the 75 calendar and scheduling apps we grade, compared
- Notion Calendar Insider's GuideFree calendar app that connects to Notion databases3.6 GPA
- Google Calendar Insider's GuideOnline calendar from Google, free with a personal account3.4 GPA
- World Time Buddy Insider's GuideVisual time zone converter and world clock for planning calls3.4 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what aCalendar’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. aCalendar is a trademark of its owner, and this guide is not made, paid for or approved by Tapir Apps GmbH. Prices and plans change: check tapirapps.de before you buy.