Maths · exercises 12–18
Differential calculus
Watch a real day fill in: a morning run, a deep-work session, a lunch note, family dinner, a quiet check-in before bed. Each hour belongs to a category you chose — never to an app demanding more.
Open any block and there's room for the whole picture: a title, a few honest words about it, a checklist of small tasks to tick off, and a link to something bigger you're chipping away at.
Name the hour and give it one of six colours — Work here. The header carries the time and a live timer while it's happening.
A line or two on what this block is really for. Future-you reads it back weeks later and remembers exactly.
Break the block into a small to-do list. Add as many tasks as you like, check them off as you go, and watch the count fill — no streaks, no guilt for the ones you don't reach.
Tie the block to a long-running pursuit — a course, a project, a training plan — and every hour you spend nudges its progress forward.
Attach a voice memo, a photo or a thought, and log what the hour cost. Everything lives on the block it belongs to.
Finish the new feature grid and the block-anatomy layout before the afternoon review. Phone on focus, two pomodoros minimum.
Every feature lives inside the same block. Add a thought, log an expense, time a focus session — all linked to the hour where it happened.
Drop a block on any hour. Title it, color it, link it. Your day becomes a quiet stack of intentions — not a to-do list.
Work, Learning, Sport, Family, Social, Self. Each with its own color, its own progress, its own time. No "Other" bucket.
Voice memo, image, text — every note attaches to the block it belongs to. A waveform from your run, a photo from lunch, a thought before bed.
Long-running pursuits — a marathon, a course, a reading list — earn their own progress bar without ever shouting at you.
Track money the same way you track time. Log an expense at the end of a block, link it to Family or Self, watch the month breathe.
A week of mood squares, a month of hours by category, an honest €/hour for the things you spend most on. Look back, not down.
24 Blocks plays the music already on your phone and quietly notes what's on during each block. Found a part that's perfect? Trim a ten-second snippet and hand it to a friend or drop it on the map — no playlists, no accounts, just the bit that mattered.
A local player for the audio on your device, with the track shown right on the block you played it in.
Drag the window to the part you love and share a short snippet — to a chat, or as your now-playing on World.
Look back and see what played during deep work, a run, or a slow Sunday — listening history tied to your hours.
This is what twelve waking hours look like in the app. Not "productivity" — just an honest record of where the time went.
5.1 km along the canal — heart rate steady, knee felt good. Two voice memos.
Pomodoro: 2 / 4 rounds done. Sketched the new feature grid.
A photo, a thought: "Slow down before the afternoon."
Pasta. Linked €18.40 grocery expense to this block.
Recolour the entire app — backgrounds, ink, every one of the six category accents — until it feels like home. Save up to five themes and switch between them whenever the mood, the season, or the screen brightness changes.
Tap a saved theme to preview it live. Tune any colour with a full picker, name it, and keep your five favourites ready to swap — light for the morning, dark for the night, something warm for the weekend.
Subscribers can hand a block or a note to anyone — a partner, a study group, a coach — and keep every day backed up to the cloud, so a lost phone never means a lost year.
Send a single block or a whole note — voice, photo or text — to anyone, in or out of the app. They see exactly what you chose to share, nothing more.
Every block, note, expense and theme syncs automatically. Switch phones, reinstall, or hand-down a device — it all comes back.
Encrypted backups mean your data is safe and restorable, even if the worst happens. Roll back to any day, any time.
Open World and your city lights up: friends mid-block, public folks nearby sharing a moment, the track someone's playing during deep work. Drop a moment-of-the-day, go fully anonymous, or just watch the city breathe. Available now.
A neighbourhood pinboard: post an offer, a request, an event or a lost-and-found note. Pinned to your area, browsable by anyone nearby — answer in a tap.
Trade what you know for what you don't — teach guitar, get help with code, swap a language hour. No money changes hands, only time and skills.
Seal a note, a photo or a voice memo to your future self — or to a place. It stays locked until the date you choose, or until someone stands where you left it.
Plan an hour together. A shared block lands on both timelines at once — same time, same notes, same photos — so a dinner or a study session is one block, not two.
Add the people you trust, see them light up on the map, and message one-to-one or in groups — all carried over the same private, anonymous channel.
Every layer of World is opt-in and anonymous by default. Share a block, a skill or a moment only when you want to — and disappear again the second you don't.
Flip on Student mode and 24 Blocks learns your timetable, tracks homework and exams, holds your grades and GPA, and runs a Pomodoro that drops a real study block on your day. Out now.
Recurring classes become blocks automatically — colored by subject, ready to note against.
Due dates surface on the day they're worth starting, not the night before.
Log marks per subject, watch your average — French /20 or your own scale.
Finish a focus run and it lands on your timeline as real, logged time.
A tidy profile with a scannable code for clubs, libraries and campus.
Every time you join a conversation, 24 Blocks mints a fresh random code: your TIC. It's the only thing the other side ever sees — no phone number, no email, no real name. And because a new one is generated each time you join, nobody can add you, find you, or message you again without you knowing. Direct chats, group chats and document exchange — fully anonymous, start to finish.
Free during beta, on iOS & Android. After launch, choose your way in:
Pick one feature to keep, with a few ads. Time blocks and World are always included.
Every feature, every module — Students, Budget, Notes, the lot. No ads, ever.
Built by one person who got tired of incomplete productivity & lifestyle apps shouting at him.