Syncbox: Couple App

In-app purchases
Content rating
Everyone
10+
Downloads
Content rating
Everyone
Users Interact, In-App Purchases
Learn more
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About this app

Some things are too long for a messaging app.
And what you said yesterday gets buried under everything since.

Syncbox is a private space for two.
The letters you write each other, your everyday conversations, and the
photos you take together — all in one place.


■ Three kinds of letters

• Weekly letter — Look back on the week and write it down. Add that week's
photos and a song, and map how each day felt.

• Q&A letter — Pick a question and send it, and your partner writes the
answer. The things you don't usually get around to asking.

• Piece letter — Short, whenever. Send the thought that just crossed your mind.

You can reply to a letter, or highlight a single line and leave a comment on it.


■ Just your conversations

Send photos, videos and voice messages.
Turn on disappearing messages whenever you want.
Pick out a stretch of conversation worth keeping and save it.
Find older messages by date or by word.


■ A shared feed

Post photos or video links and build a timeline only the two of you see.
React, and keep the conversation going in the comments.


■ Saved

A line from a letter that stayed with you. A conversation you want to read
again. A photo you took together.
Everything you save is collected in one place, and searchable.


■ Because it's only for two

• You connect with one person you invite. No followers, no suggestions,
no strangers.
• Turn on app lock and open it with a passcode or your fingerprint.
• Letters and messages are stored encrypted.
• You can delete your account and your records at any time.


What the two of you said to each other scatters faster than you'd think.
Keep it in Syncbox.
A private space for two. Write letters, share your days, keep them together.
Updated on
Nov 3, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • This app may collect these data types
    Personal info, Messages and 7 others
  • Data is encrypted in transit
  • You can request that data be deleted

What’s new

- Pick the whole exported KakaoTalk folder when importing.
- Imports keep going even if you switch to another app.
- Share photos and videos from your gallery straight to Syncbox.
Content rating
Everyone
Users Interact, In-App Purchases
Learn more

App support

About the developer
싱크박스
privacy@oursyncbox.com
대한민국 서울특별시 성북구 성북구 동소문로15길 99, 119동 204호(동소문동7가,한신휴아파트) 02830
+82 10-7290-5665