Everything
in Kalendars.

Kalendars is a calendar app for iPhone, with a Mac version coming soon, made for plans with other people. You send one link, your friends answer in a tap with no app to install, and everyone sees who is coming. When a time doesn't work, someone suggests another one and you move the plan in one tap. It reads the calendars already on your phone, so your week stays in one place, with free time drawn as free time.

It is made for plans with other people. Every calendar you have used was built for work, so it is shaped around meetings, rooms and availability, and it is slow to use for anything that isn't one. In Kalendars, adding something takes one sentence instead of seven fields, and planning a dinner with three friends takes one link instead of twenty messages. The rest is craft: it is a real iPhone app rather than a web page in a wrapper, it draws your free time as free time instead of leaving it as a gap, and it has the small things a tool you open dozens of times a day should have, down to a left-handed layout. Kalendars is not a replacement account either: it reads and writes the calendars your phone already has, Google and iCloud and Outlook included.

People whose calendar is mostly their life rather than mostly their job: the dinners, the training, the family things, the trip in three weeks, alongside the work that also has to fit. If you open your calendar many times a day and it has never once made anything easier, that is who it is for.

Kalendars runs on iPhone, and a Mac version is coming soon. There is no Android or Windows version, and no web app: Kalendars reads the calendars the operating system already holds, so it lives where those calendars live.

You type it the way you would say it. “Dinner with Sam and Alex next Thursday at 8” is the whole interaction: Kalendars reads the sentence, works out the day, the time and who is coming, and puts the event where it belongs. There is no form with seven fields to fill in, and nothing to learn first. Dinner with friends, planned in about forty seconds.

That is the half of a calendar nothing else does. You tap plan an evening and your free evenings are already on screen, or you type “lunch at 1” and every day that works is right there. Then you add whoever is coming to the event itself, straight from your contacts, and send them the plan as a link they can put in their own calendar.

No, and that is the point. Every calendar before this one invites people by email address, which is fine at work, where you have the address of everyone you have ever been in a meeting with. It is useless for the rest of your life: you have your friends’ phone numbers in your contacts and almost none of their email addresses, so the tool that runs your evenings is built around the one detail you do not have. Kalendars works from your contacts instead. You add the person, not an address.

Yes. You can make groups out of your contacts, the five-a-side team, the book club, your family, and put the whole group on an event instead of picking the same six people every time. Everyone in the group lands on the plan and gets the link. Kalendars also records who was on each plan at the time, so adding or removing someone from a group later does not rewrite who was at last month’s dinner.

No. What you send is a link. It opens in whatever browser they already have, shows them that one plan and nothing else of your week, and puts the event into their own calendar in a tap. No app to download, no account to create, no sign-up before they can answer you. This is the part that usually breaks, because a person who has to install something first simply does not answer you.

Kalendars reads the birthdays your phone already knows, from the calendar your contacts feed, and shows them properly. Instead of a grey all-day bar that says “Verjaardag van Jan Jansen”, you see a cake and the name: Jan Jansen. It works in the language your phone is set to. Birthdays are all-day, so they never eat an evening when Kalendars is looking for a slot to offer you, and they sit at the top of the day so the day you were about to double-book is the day you notice.

Your week reads in one look, in the calendar colors you already know, so work, family, training and Thursday's dinner are one picture instead of four feeds. There is a day view, a week view and a running list of what is actually next, plus a home-screen widget for the thing you keep unlocking your phone to check. Free time is drawn as free time rather than left as an absence, which is what makes an evening you could still use visible at all.

No, and there is nothing to migrate or connect. Kalendars reads the calendars your iPhone already has, through the permission you grant in iOS. If your Google, iCloud or Outlook accounts are already in your phone's Settings, they are already in Kalendars. Anything you add in Kalendars is written back to those same calendars, so it shows up everywhere else you look.

Yes. Kalendars reads your calendar on your iPhone and never uploads it, so your agenda is not stored on our servers: what your events are and what their notes say stay on your phone unless you share a plan. What you type to plan is read on your phone too. A plan only leaves your phone when you share it, and only that plan; a place you pick for an event is saved to your account so it follows you to your other devices. Ask Kuberdon, the assistant in the app, is the one exception, and only when you use it. Ask Kuberdon is answered by AI from OpenAI or Anthropic, through our server, after you allow it. It sends your request, your first name, your work and sleep hours, the names you mention and your plan requests. Your calendar's titles and times for the days you ask about go only if you allow that too. We don't store them. Kalendars sends an invitation only when you tap Send, and never sells your contacts. What we do see is your account (your name, email address and subscription) and how you use the app. Kalendars is paid for by the people who use it, never by advertisers, so you are not the product.

Kalendars comes from the App Store, on iPhone. You sign in with Apple, with Google, or with a one-time code sent to your email or phone, and you subscribe in the app.

Kalendars is one subscription with everything in it, paid monthly or yearly, with a free trial on the yearly plan. The price for your country is shown in the App Store before you subscribe.

When you subscribe in the app, monthly or yearly, through your Apple ID. On the yearly plan, eligible new subscribers start with a free trial, and nothing is charged until it ends. The price for your country is shown in the App Store before you subscribe.

Kalendars is built by Jensen Bernard and operated by JB CAPITAL BV, trading as Kuberdon, a company registered in Belgium (VAT BE 1005.101.429). It is a small, self-funded project rather than a venture-backed one, which is why the people using it get a vote on what gets built next and why it is paid for by them rather than by advertisers.

Email [email protected] and a person answers, usually the founder. For anything that is not support, [email protected] reaches the same place.