One sentence a day journal, diary & memory book
No essays. No prompts. Just one sentence a day before you sleep - and a private, mindful record of your life that builds itself.
Now on Android · Free to start · No credit card
Sunday, May 30
Your sentence
Finally shipped the feature I'd been stuck on
A gentle reminder arrives when you usually wind down. No pressure - just a quiet nudge to reflect.
Anything. The meeting that went well. The coffee that didn't. The thing nobody else knows happened.
Day by day, a timeline builds. A year from now - a full scroll through every version of yourself.
"Handed in my notice and cried in the car for twenty minutes, but it was the right kind of crying."
"Walked home in the rain and didn't mind at all - first time I can remember feeling that way."
"Finally told my boss the truth and felt lighter for the rest of the day."
"Looked back at January and barely recognised that version of me - I think that's a good thing."
On this day
Open the Memories tab to see what you wrote on this date across every year - a five-year memory book that fills itself in, one line at a time. The older your journal, the more powerful this gets.
A gentle nightly nudge
One reminder at the time you choose - and it goes quiet the moment you've written your sentence.
Private & synced
Your entries are yours alone - encrypted in transit and safely synced to the cloud, across reinstalls and new phones.
Light, Dark & System themes
Read it in warm paper or quiet dark - or let it follow your phone, automatically.
Warm paper
"one line a day."
Quiet dark
"one line a day."
One grace day a month
Miss a day without losing your streak. Life happens - your journal survives it.
A paper one line a day journal is lovely - until the night you forget it, or the book goes missing. A one sentence a day journal app keeps the same habit alive: a gentle nightly reminder so you actually write, private cloud sync so you never lose an entry, instant search, and an automatic on this day view across every year - the digital answer to a five-year memory book.
New to the idea? Read the guide to one-sentence journaling, or see how the app compares to a paper journal book.
One-sentence journaling - also called a one line a day journal - means writing a single sentence about your day. It's a micro journaling habit small enough to keep every night, so a timeline of your life builds itself over months and years. Read the full guide →
OneSentenceDay does one thing well: one sentence a day. No long entries, mood grids or blank pages to fill. Your diary is encrypted in transit and synced to the cloud, so it follows you across reinstalls and new phones - and the Memories tab shows what you wrote on this day across every year.
Yes. Many people use their one sentence a day as a gratitude journal or a mindful daily reflection - one line on what you're grateful for, or a moment worth remembering. Because it takes under a minute, it's an easy mindfulness habit to keep every night.
It's the digital version of the idea. A paper five-year journal or one line a day memory book gives you a few lines per date across several years. OneSentenceDay does the same thing automatically and without limit - the Memories tab lines up what you wrote on this day across every year, and it syncs so you never lose it or run out of pages.
Yes. Your entries are yours alone - encrypted in transit and safely synced to the cloud so you never lose them when you switch devices.
Yes, it's free to start with no credit card required. You can write your one sentence a day and build your timeline for free.
Open the Memories tab to see every sentence you've written on today's date across past years, side by side. The older your journal gets, the more powerful this becomes.
You get one grace day a month, so missing a single day won't break your streak. Life happens - your journaling habit survives it.
OneSentenceDay is on Android now, with iOS on the way. Your journal syncs to the cloud, so it will move with you when more platforms arrive.
Start the journal you'll still have in ten years.