Where every word is real.
No bots. No AI-written posts. Just people, typing every word themselves.
Words with a person behind them.
The kind of lines Sincerus is for. The app opens with these.
Mustafa Kemal Atatürk1881–1938Peace at home, peace in the world.
William Shakespeare1564–1616Brevity is the soul of wit.
Marie Curie1867–1934Nothing in life is to be feared, it is only to be understood.
Mark Twain1835–1910Get your facts first, and then you can distort them as you please.
- Mustafa Kemal Atatürk1881–1938
Peace at home, peace in the world.
- William Shakespeare1564–1616
Brevity is the soul of wit.
- Marie Curie1867–1934
Nothing in life is to be feared, it is only to be understood.
- Mark Twain1835–1910
Get your facts first, and then you can distort them as you please.
- Mustafa Kemal Atatürk1881–1938
Peace at home, peace in the world.
- William Shakespeare1564–1616
Brevity is the soul of wit.
- Marie Curie1867–1934
Nothing in life is to be feared, it is only to be understood.
- Mark Twain1835–1910
Get your facts first, and then you can distort them as you please.
Abraham Lincoln1809–1865A house divided against itself cannot stand.
Nikola Tesla1856–1943The present is theirs; the future, for which I really worked, is mine.
Frederick Douglass1818–1895If there is no struggle, there is no progress.
- Abraham Lincoln1809–1865
A house divided against itself cannot stand.
- Nikola Tesla1856–1943
The present is theirs; the future, for which I really worked, is mine.
- Frederick Douglass1818–1895
If there is no struggle, there is no progress.
- Abraham Lincoln1809–1865
A house divided against itself cannot stand.
- Nikola Tesla1856–1943
The present is theirs; the future, for which I really worked, is mine.
- Frederick Douglass1818–1895
If there is no struggle, there is no progress.
Written by hand. Signed by your iPhone.
Paste and AI writing are off. You confirm with Face ID before your posts go live.
1Type it yourself
Paste, cut and Writing Tools don’t work in the post editor.
- 2
Say what it is
A tone on every post, and a type and topic if you like.
3Confirm with Face ID
Your iPhone signs the post. We check the signature.
The people you follow. In order.
Following opens first, newest on top. For You and Trending are there when you want them.
Only the people in the chat can read it.
Chats are end-to-end encrypted and stay on your iPhone.
- End-to-end encrypted
- Read receipts
- Reactions
- Replies
Safety numbers
Compare one with a friend to make sure no one is in between.
Disappearing messages
Set a timer and messages delete themselves.
Chat Lock
A secret code and Face ID keep chosen chats out of sight.
Your face never leaves your phone.
Face ID runs in your iPhone’s Secure Enclave. We only receive a yes, signed by your device.
What reaches us when you post
- Your faceStays on your iPhone
- Your Face ID dataStays on your iPhone
- Your chatsEncrypted on your devices
- A signature from your iPhoneChecked with Apple
- Your words and photosPhotos are checked first
Never AI training data
Your posts aren’t licensed for AI unless you opt in.
Assist stays on your iPhone
Translate and In short run on the device. AI never writes for you.
Take a look around.
Say more. Rank the same.
Premium never ranks anyone higher. It removes every ad.
- Premium badge
- 1,000-character posts
- 4-character usernames
- Folders on your iPhone
- Undo post
- Seven app colors and icons
$4.99 a month or $39.99 a year
Common questions
Is Sincerus free?
Yes. Sincerus is free on iPhone. Premium adds a badge, longer posts and a few extras, and never changes how your posts rank.
Why Face ID when you post, not just at sign-up?
Signing up once proves little; a bot can take over later. Asking when you publish, with one confirmation covering only the next five minutes in the app, means each post was confirmed by the person holding the phone.
Do you store my face?
No. Face ID runs entirely on your iPhone. We receive a cryptographic signature, never an image or biometric data.
Can I post photos?
Yes, up to 2 photos per post, reply or quote, and a post can be just photos. Every photo is checked automatically for nudity and violence before it is posted. Post photos you took or made yourself. Images made with AI aren’t allowed; touching up your own photo with AI, like removing something in the background, is fine. Video isn’t supported.
Is there an Android app?
Not now. Sincerus relies on Apple’s App Attest and Face ID to show that each post was written on a real iPhone.
Where is Sincerus available?
For people 18 and older in the United States and in Türkiye, where age is also confirmed with e-Devlet. Sign-ups in Türkiye open once e-Devlet age verification is ready.
Write something real.
Sincerus is for real people writing in their own words.