The Etar Insider’s Guide
Everything we know about Etar 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.
Etar
The Insider’s Guide
Open-source Material Design calendar for Android
Every plan, grade, refund rule and rival among calendar and scheduling apps, read from Etar’s own pages.
Made by The Etar Project · 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 Etar’s own pages, its app-store listings and our grades. Every fact in it is on Etar’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
Etar is a free, open-source calendar app for Android, built as an enhanced version of the calendar from the Android Open Source Project. It uses Android's calendar storage, so it shows any calendar that another app or account syncs to the phone, and it can also keep an offline calendar that stays on the device. The app offers month, week, day and agenda views in light and dark themes. It is licensed under the GPLv3 and distributed through F-Droid.
To get you started, here are 8 things to know about Etar, taken from its own pages and our grades.
No rating on record, and there's wiring to do.
- 1
Best for a plain open-source calendar on Android
You get it from F-Droid, and it's Android only.
- 2
It is free
Etar has no paid plan at all. Free and open source under the GPLv3. The app is installed from F-Droid or built from the source on GitHub, and the project lists no paid version.
- 3
It runs on Android
Android.
- 4
Month, week, day and agenda views
Four views in a Material Design interface with dark and light themes. Recent versions let the week start on any day and can stagger overlapping events.
- 5
Works with any Android calendar provider
Etar reads Android's calendar storage, so it shows every calendar synced to the phone. You choose which ones are displayed and which one new events go to.
- 6
Offline calendars
A calendar can be created that is stored on the phone only and never synced to a server.
- 7
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.
- 8
Keep it
Etar is free, so making your own would save you nothing.
Etar at a glance
- Pricing
- Free
- Free plan
- Yes
- Free trial
- None stated
- Runs on
- Android
- Made by
- The Etar Project
- Category
- Calendar & Scheduling
- Our grade
- 2.6 GPA, good
The report card
Best for a plain open-source calendar on Android
Etar is a free, open-source Android calendar with no ads, no account and no paid version, showing the calendars already on your phone in month, week, day and agenda views. It has no CalDAV client, so syncing with a server needs a second app such as DAVx5, and the project calls its ICS import unstable. You get it from F-Droid, and it's Android only.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | A | Free, and there's no paid version above it to be steered towards. The whole app is open source under the GPLv3 while most of this category wants $6 a month. |
| Free plan and trial | A | All of it is free, with no tier, no ads and no account. Install from F-Droid or build it yourself from the source on GitHub. Nothing to run into. |
| Features | C | The basics, done plainly: month, week, day and agenda views, an offline calendar, ICS sharing and an agenda widget. The gaps are in the project's own notes, though. No CalDAV client, so server sync is another app's job, and it warns that ICS import has known bugs. |
| Ease of use | C | No rating on record, and there's wiring to do. It comes from F-Droid, since the Google Play link in the README returned Not Found when we checked, and syncing with a server means setting up DAVx5 as well. |
| Platforms and integrations | D | One operating system: Android, version 1.0.57 needing Android 6.0 or newer. It'll show any calendar another app syncs to the phone, Google included, but there's no iPhone, desktop or web version. |
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 Etar is for
- Fits if you're on Android and want a plain calendar whose code anyone can read
- Works for people who sync their own CalDAV server through DAVx5 and need something to show it
Who it is not for
- Skip it if you want sync built in, because Etar has no CalDAV client and relies on other apps
- Not for you if you get lots of emailed invitations, as the project calls its ICS import unstable
- Watch out: the Google Play link in its README returned Not Found, so the current version comes from F-Droid
- Too light for anyone wanting tasks, templates or widgets beyond one agenda list
- Skip it if you also use an iPhone or a computer: it's Android only, version 6.0 or newer
Good to know
Good for
- Android users who want a plain calendar with open source code
- People who sync a self-hosted CalDAV server through DAVx5
- Keeping an offline calendar that stays on the phone
Worth knowing
- Android only; the F-Droid build of version 1.0.57 requires Android 6.0 or newer.
- No CalDAV client is included. Syncing a calendar with a server needs another app, such as DAVx5.
- The project describes its ICS import as unstable and advises caution if your provider sends invitation emails automatically.
- The Google Play link in the project's README returned a Not Found page on the check date; F-Droid carries the current version.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
Free
No paid plan at all
Etar is free to use.
Free, and there's no paid version above it to be steered towards.
Etar
$0
The complete app, built and signed by F-Droid from the public source code. Version 1.0.57 requires Android 6.0 or newer.
The free plan
Free and open source under the GPLv3. The app is installed from F-Droid or built from the source on GitHub, and the project lists no paid version.
Read from github.com on Oct 9, 2026.
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
Open-source Material Design calendar for Android. Here is what it does, as its own site describes it, and what it covers: open source, works offline, local-first, calendar.
The basics, done plainly: month, week, day and agenda views, an offline calendar, ICS sharing and an agenda widget.
- Month, week, day and agenda views
- Four views in a Material Design interface with dark and light themes. Recent versions let the week start on any day and can stagger overlapping events.
- Works with any Android calendar provider
- Etar reads Android's calendar storage, so it shows every calendar synced to the phone. You choose which ones are displayed and which one new events go to.
- Offline calendars
- A calendar can be created that is stored on the phone only and never synced to a server.
- ICS sharing, import and export
- Calendars can be shared as ICS files and imported or exported from storage, including invitations received by email. The project warns that import has known bugs.
- Agenda widget
- A home screen widget lists upcoming events in agenda form. The interface is translated into many languages by volunteers.
Where it runs
- Android
What it works with
- DAVx5
- Google Calendar
Etar is made by The Etar Project.
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
Etar'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 free plan and trial (A, above 56 of 74) and worst on platforms and integrations (D, above 0).
Etar has no paid plan.
On features, ease of use and platforms it scores 1.7 out of 4. Nothing scores higher for less, though at least one tool matches that score at a lower price.
Each grade against the category
Every bar is all 75 calendar and scheduling apps we grade, cut by the letter each got. Etar’s own letter is outlined.
- AValue for moneyAbove 45 of 74
- AFree plan and trialAbove 56 of 74
- CFeaturesAbove 3 of 74
- CEase of useAbove 0 of 74
- DPlatforms and integrationsAbove 0 of 74
Price against what you get
Each dot is one of 67 calendar and scheduling apps. Further left costs less; higher up scores better on features, ease of use and platforms. Etar is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
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
Etar is free, so making your own would save you nothing.
What you could make
- Calendar: an app builder makes this well.
What you could not
- A real app for Android. Something home-made would be a web page.
- Hooks into the device itself: widgets.
What this rests on. Etar’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
Fossify Calendar, Google Calendar, aCalendar, Proton Calendar and Tuta Calendar
The 5 tools Etar is most often weighed against, with where each one differs from it.
- 2.8GPA
Fossify Calendar
Free
Open-source Android calendar with no ads, tracking or account.
- 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.
- Etar is open source, according to its own site.
- 2.6GPA
aCalendar
Free plan · from $2.49 one-time
Android calendar with widgets, tasks and one-time upgrades.
- Etar is open source, according to its own site.
- aCalendar can be bought with a one-time purchase.
- aCalendar also covers tasks.
- 2.6GPA
Proton Calendar
Free plan · from $3.99/mo
End-to-end encrypted calendar from the maker of Proton Mail.
- Only Proton Calendar lists a web app.
- Only Proton Calendar lists macOS, Windows, Linux and iOS apps.
- Proton Calendar is end-to-end encrypted, according to its own site.
- 2.4GPA
Tuta Calendar
Free plan · from €3/mo
End-to-end encrypted calendar bundled with Tuta Mail.
- Only Tuta Calendar lists a web app.
- Only Tuta Calendar lists macOS, Windows, Linux and iOS apps.
- Tuta Calendar is end-to-end encrypted, according to its own site.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
13
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 Etar free?
Yes. Etar is free to use.
How much does Etar cost?
Etar lists one plan. Etar: $0.
What platforms does Etar work on?
Etar is available on Android.
Does Etar have an iPhone app?
No iPhone app was listed when its pages were read on Oct 9, 2026. Etar is listed for Android.
Does Etar have a Windows app?
No Windows app was listed when its pages were read on Oct 9, 2026. Etar is listed for Android.
Is Etar open source?
Yes. Etar is open source, according to its own site.
Does Etar work offline?
Yes, according to its own site. What works without a connection differs by plan and platform, so check the vendor's page for the detail.
What does Etar integrate with?
Etar's listing names DAVx5 and Google Calendar. A listing names up to eight integrations, so it may connect to more.
Who makes Etar?
Etar is made by The Etar Project.
What are the alternatives to Etar?
The closest alternatives to Etar in our directory are Fossify Calendar, Google Calendar, aCalendar, Proton Calendar and Tuta Calendar.
How does Etar compare with other calendar and scheduling apps?
Etar's GPA of 2.6 is higher than 30 of the 74 other calendar and scheduling apps we grade, and level with 13.
Is Etar good value for money?
ToolGPA grades Etar A for value for money. Etar has no paid plan.
Could I make my own version of Etar?
Etar is free, so making your own would save you nothing. What you could not make: A real app for Android.
Where this guide comes from
The prices, plans, platforms and features were read from Etar’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 the Etar project's own pages on 9 October 2026. Also tested with a demo account on 2026-03-02.
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 The Etar Project. Prices change, so check github.com before you buy.
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
- Etar, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/etar
- 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, "Etar: The Insider's Guide", checked Oct 9, 2026. https://toolgpa.com/tools/etar
Know someone choosing between calendar and scheduling apps?
Send them this guide: toolgpa.com/tools/etar/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded calendar and scheduling apps after Etar, 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 Etar’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. Etar is a trademark of its owner, and this guide is not made, paid for or approved by The Etar Project. Prices and plans change: check github.com before you buy.