Comparison

ooin vs mono

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

ooin

Features
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OOIN is a social community where you share everyday moments and thoughts, react to each other's stories, and grow closer along the way. Starting a conversation out of nowhere is hard for anyone. On OOIN, the story comes first. Someone relates to what you wrote, you add a word to someone else's day, and little by little you get to know each other. [Main Features] Feed β€” where your day gets written down Short is fine. Post whatever just crossed your mind. You don't have to figure out what to say first. Likes and comments Tap to show a post resonated with you, and leave a few words. Small gestures add up, and conversations begin. Streak & Hot Streak A space to scroll through posts and write your own. Hot Streak brings you the 10 most-read posts, refreshed every hour. Interest communities Join communities built around what you love, or open and run a channel of your own. When people with similar tastes gather, there is always something to talk about. Chat profile In community chat rooms, you can set a nickname and photo used only in that room. Your own profile in the feed, your most comfortable self in conversations. Share with your OOIN Pass a post you liked straight to someone you have grown close to. When stories click, conversations follow naturally. A safe place Reporting and blocking help everyone keep the atmosphere comfortable. [Recommended for] β€’Anyone looking for somewhere to browse when bored β€’Anyone who wants to share what is on their mind β€’Anyone who wants to talk with people of similar tastes β€’Anyone who wants to get closer to new people without pressure β€’Anyone who wants to create and run their own community Start with a single line about your day. As stories pile up and you add a word to each other's days, you will find people you click with. Terms of Service: https://ooin.co.kr/terms Privacy Policy: https://ooin.co.kr/privacy

About

mono

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the app to have that conversation. one line. two people. mono is an encrypted 1-to-1 messaging app. you can have only one conversation at a time β€” no chat lists, groups, channels, or feeds. you connect via a unique, ephemeral 18-character key that rotates every 180 seconds. no matchmaking, stranger discovery, or public directory. no one can reach you unless you deliberately shared a key with them. no registration, no identity no name, email, phone, or personal data. no profile picture, no history, no trace β€” nothing tied to your real identity. radical privacy every message is end-to-end encrypted β€” only you and the other person can read it. not mono, not any server, not anyone else. ephemeral messages only the last 15 messages stay visible. the rest is permanently deleted. cut the line either person can cut the line β€” everything is deleted for both, instantly and permanently. screenshot protection (iphone and mac) messages, keys, photos, videos, and files stay hidden from screenshots and screen recordings. optional protection face id, passcode, keyword lock, and an emergency panic pin. 36-hour rule after 36 hours of inactivity, the entire conversation is permanently deleted for both. no notifications no badges, no banners, no sounds. no extras just text, images, videos, and files. no calls, video calls, or voice notes. view once images, videos, and files open once per person, then lock for good.

Screenshots

ooin4 screens
mono4 screens

Verdict

The call

The clearest difference is in-app purchases: mono at none against ooin's 2. mono also leads on device support (3 vs 1). ooin's advantage is iOS requirement (16.6 vs 26.2). On price, update cadence and ads there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. ooin sells 2 in-app purchases, starting at $3.99 per month. mono asks for nothing beyond the download.

UpkeepUpdate frequency

ooin ships an update every 2 weeks, mono weekly. The most recent releases landed on October 31, 2026 and October 28, 2026 respectively.

Scorecard3 real differences Β· 3 level
ooin versus mono: the parameters behind the verdict, then further details
Parameterooinmono
PriceFreeFree
Update frequencyEvery 2 weeksWeekly β€” better
AdsNoNo
In-app purchasesYesNo β€” better
DevicesiPhoneiPhone, iPad, Mac β€” better
Requires iOS16.6 β€” better26.2
Further details β€” not scored
Size32 MB18 MB
Age rating17+17+
DeveloperheyviaSteve Urrego

In-app purchases

2 purchases

ooin

Subscriptions2
  • ooin Premium Monthly$3.991 Month
  • ooin Premium Yearly$34.991 Year
None

mono

No in-app purchases

Questions

Is ooin free?
ooin is free to download, with in-app purchases available.
Is mono free?
mono is free to download, with no in-app purchases.
Do ooin or mono have ads?
Neither ooin nor mono shows ads.
Which is updated more often, ooin or mono?
ooin ships an update every 2 weeks, and mono weekly. Most recently, ooin was updated on October 31, 2026 and mono on October 28, 2026.

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