Common Birthday

100! – Together we are 100!
Celebrate, remember, calculate – this app brings people together and makes big anniversaries come alive, long before anyone turns 100 alone.

Never forget a birthday again

With 100! you keep track of all the important birthdays. Parents, siblings, friends, grandparents or colleagues – the app reliably reminds you, automatically and on time, of every birthday. Thanks to smart notifications, you’ll get a reminder every morning at 10 a.m. so you’ll never miss a special day again.

Celebrate together instead of alone

Everyone gets older – but big round anniversaries come much faster when you count them together.
100! calculates when you and your family, your school class, your club, your group of friends or your team reach a shared milestone.

When will you together reach 100 years?

When will your group turn 500 years?

When will your whole family celebrate 1000 years of life?

These magical moments are the perfect reason to celebrate – far better than waiting alone for your personal 100th birthday.

More reasons to celebrate

100! shows you how quickly these milestones approach:

Siblings together soon reach 200 years.

Your soccer team adds up to 1000 years of life.

Your old school class will soon celebrate a 500-year total.

Suddenly there are so many more reasons to meet, laugh, celebrate and create memories.

Personal & visual

Add people with name, birthday and photo.

Use your own pictures or quickly select from your gallery.

Mark the people you want to include in a milestone calculation.

Smart calculations

100! calculates the exact day when the combined age of your selected people reaches your chosen target – whether 100, 200, 500 or any other number. This way you always know in advance when a truly special day is coming.

Multilingual – for the whole world

Birthdays are celebrated everywhere – and 100! speaks many languages. Whether you want to invite your family in Germany, friends in the USA, colleagues in Spain or classmates in Japan – the app automatically adapts to the local language.

Features at a glance

🎂 Save birthdays and add photos

⏰ Automatic reminders (local notifications)

📅 Calculate shared milestones down to the exact day

🌍 International language support

🤝 Share results via message, email or social media

🔒 Local storage only, no cloud – your data stays private

Why 100!?

Birthdays connect us. But life is busy, and it’s easy to forget important dates. 100! makes sure you always congratulate on time. Even better: you’ll discover how many shared life years you and your loved ones already have – and when the next big number is coming.

Because: Celebrating 100 together is far more fun than waiting alone for your own 100th.
Family reunions, class meetups, club anniversaries or gatherings of friends – 100! gives you the perfect reason to invite everyone again.