Independent app studio · Berlin

Calm little apps for everyday life.

KD Incubator makes simple, private apps for learning, money and family life. Every one of them lets you start without an account.

Meet the apps Say hello

An average of
4.9 stars.

Real screens from each app, step by step. Scroll, and the phone follows along.

SwiftStudy app icon

Flashcards by SwiftStudy

SwiftStudy

Your memory’s new playground.

Playful, simple flashcards for iPhone and iPad. Cards are double-sided and hold words, pictures, definitions, formulas or long text.

Download on the App Storeswiftstudyapp.com
SwiftStudy “Your Stacks” list: Capitals of Europe, Spanish, Japanese, Math exam, Robotics, Cat breeds, Precious stones and Chemistry, each with a progress ring.
SwiftStudy study mode: a flashcard with a photo of Madrid and the word Spain, above Didn’t know and Knew it buttons.
SwiftStudy session summary: “You have finished your stack!” with 100% accuracy, 0 demoted, 1 promoted and 58% mastery.

Make a stack for anything.

Group cards into stacks in the colours you like, from Capitals of Europe and Spanish to a math exam, robotics or cat breeds.

Flip, then be honest.

Look, flip, and tap “Knew it” or “Didn’t know”. Right answers promote a card, wrong ones send it back. Cards you keep nailing show up less often, so your study time goes where it actually helps.

Watch every card grow.

Every card starts as a little seedling and climbs four mastery levels. Session summaries show your accuracy and which cards were promoted, and streaks keep you consistent.

NewIn PracticeFamiliarMastered

  • No account, no ads
  • Optional iCloud sync
  • Available in 7 languages
Bottomline app icon

Budget planner by Bottomline

Bottomline

Your whole month on one calm screen.

Daily budget, upcoming bills and savings goals, in a budgeting app that’s genuinely nice to open.

Download on the App Storebottomlineapp.com
Bottomline home: “Hey Dan,” with the monthly budget left, the daily budget, a “Can I afford this?” check and the latest transactions.
Bottomline transactions grouped by day, with a search field at the bottom.
Bottomline insights: your bottom line with upcoming rent, health insurance and electricity, and a spending breakdown by category.
Bottomline Growth hub: available cash, net worth, cash earnings by source and savings milestones.

Set your month.

Add your income, fixed costs and savings. Your daily number appears straight away.

Log it in three taps.

Amount, category, done. Or just say it out loud: “coffee, three fifty”.

See where it went.

Your bottom line, spending by category, and this month next to last month.

Watch it grow.

Savings milestones, cash earnings and your net worth, together in the Growth hub.

Every recurring cost, finally on one list.

Rent, insurance, subscriptions: what’s due next and what it all adds up to. Plus bill reminders, and a “Can I afford this?” check before you pay.

  • No bank linking
  • Data stays on your device and in your iCloud
  • iPhone and iPad
Bamboo app icon

Baby tracker · Coming soon

Bamboo

A little calm for your growing family.

Feeds, sleep, and all the everyday stuff. A little help keeping track, so you can get back to being there.

Coming soon to iPhonetrackwithbamboo.com
Bamboo home: “Good morning, Luna, 4 months old” with the panda family, and the Start Feeding sheet with nursing or bottle and a starting side.
Bamboo Trends: bar charts of sleep hours, feeds and diaper changes per day.
Bamboo hospital bag checklist: “Let’s get packing”, 31 of 46 packed, with the Labour and comfort list.

Little moments, gently noted.

Nursing, bottle, pumping and first foods. Pick a side and start the timer, or log a past feed.

“Did they nap?” Already in Bamboo.

Time naps live or add them later, then see sleep trends next to feeds and diapers.

Ready before baby, too.

Prenatal tools include a hospital bag checklist and a contraction timer.

Everyday care, shared.

Diapers, growth, temperatures, medicine, vaccinations and appointments. A partner can add and edit too, and a small note shows who added what.

  • Feeds
  • Diapers
  • Growth
  • Medicine
Illustration of the Bamboo panda family at home: two parents and their baby resting together, with a bamboo plant, a bookshelf and toy blocks.
Made for the beautifully ordinary days.
  • No account needed to start
  • Works offline
  • Optional account adds sync and partner sharing
SwiftStudy “Your Stacks” list: Capitals of Europe, Spanish, Japanese, Math exam, Robotics, Cat breeds, Precious stones and Chemistry, each with a progress ring.
SwiftStudy study mode: a flashcard with a photo of Madrid and the word Spain, above Didn’t know and Knew it buttons.
SwiftStudy session summary: “You have finished your stack!” with 100% accuracy, 0 demoted, 1 promoted and 58% mastery.
Bottomline home: “Hey Dan,” with the monthly budget left, the daily budget, a “Can I afford this?” check and the latest transactions.
Bottomline transactions grouped by day, with a search field at the bottom.
Bottomline insights: your bottom line with upcoming rent, health insurance and electricity, and a spending breakdown by category.
Bottomline Growth hub: available cash, net worth, cash earnings by source and savings milestones.
Bamboo home: “Good morning, Luna, 4 months old” with the panda family, and the Start Feeding sheet with nursing or bottle and a starting side.
Bamboo Trends: bar charts of sleep hours, feeds and diaper changes per day.
Bamboo hospital bag checklist: “Let’s get packing”, 31 of 46 packed, with the Labour and comfort list.

In their words.

SwiftStudy

“Simple and intuitive.”

“Lovely colours and clean design.”

“No unnecessary features.”

From App Store reviews
Bottomline

“Finally, a budget app that doesn’t feel overwhelming. The design is beautiful and it’s actually fun to use!”

Sarah M.
Bottomline

“I’ve tried so many budget apps, but this one sticks. The recurring expense feature is a game changer.”

Michael R.

The studio

Start without an account.

KD Incubator UG is an independent app studio in Berlin. Calm, simple, private apps for everyday life, and each one lets you begin right away, with nothing to sign up for.