Comparison

Diffu vs Yearbound

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

Head to head
About

Diffu

Features
Read full description

Is there something you want to say but keep holding back? It won’t stay forever, so you can be a little more honest. Diffu is a public feed where you can put what you want to say into words and discover what others have shared. Start with Today’s Question when you need a prompt, or simply write whatever you want to say. A short sentence or a longer entry—either is welcome. Posts stay on the feed for a set amount of time and disappear when their public time ends. Your own posts remain available in your Records. ■ Write Freely What do you want to say right now? Share anything about daily life, work or school, love, family, relationships, interests, or whatever else is on your mind. ■ Today’s Question A new question opens every day. When you’re not sure what to write, start with a single sentence inspired by Today’s Question. ■ React and Send a Feeling React to other people’s posts to show that you relate. Send a Feeling lets you anonymously share a feeling and a short message. Depending on a post’s settings, reactions and feelings may extend its public time. ■ Records Calendar Days when you write freely or answer Today’s Question are marked on your calendar. See the days you recorded this month and how long you’ve kept your rhythm going. ■ Record Badges Your activities and small milestones in Diffu become badges, such as First Flame, Seven-Day Rhythm, and Flow of Records. Choose a featured badge to express yourself. ■ Posts Leave the Feed When Public Time Ends Diffu is neither a social network where everything stays public forever nor a private journal only you can see. It is a place where you can put your words out there for a while before they leave the public feed. For the words you’ve been holding back, let them out on Diffu—where they won’t stay forever. Privacy Policy: https://diffu.app/en/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Yearbound

Features
Read full description

A space where a promise to yourself becomes a record of quietly witnessing one another.
Write your daily intentions in Manifesto. Invite a Witness to quietly watch over your journal, become a Witness for someone you care about, or write alongside a Co-Writer who shares the same stretch of time. Every entry is encrypted and kept as something deeply, enduringly yours. HOW IT WORKS What did you write three days ago? What feeling lingered last month? What did the you from a year ago believe, fear, or hope for? You don’t have to go searching for your past. Yearbound brings it back to you—quietly, and at exactly the right time. 9 Volumes One life, seen through nine lenses: Journal —What from today would you want to meet again later? Growth —What kind of person are you slowly becoming? Gratitude —What precious thing is already here beside you today? Love —Who is resting most deeply in your heart right now? Mindful —In this moment, are you truly here? Letters —Who are your unspoken words reaching for? Work —Where is this work leading you? Abundance —What does “enough” feel like to you right now? Challenge —What effort today will your future self be grateful for? Manifesto Write your daily intentions in Manifesto. They do not need to be long or polished. A single honest sentence, a quiet promise, a hope you are not ready to let go of—those are enough. Over time, these lines become more than notes. They become a trace of who you want to be and what you want to remain true to. Co-Writer Write on the same page together and share time, feeling, and memory. When one person’s record meets another person’s words, something new takes shape—something neither could have made alone. Co-Writer is not only a feature for writing together, but a way of making shared time visible. Witness Invite a Witness to quietly keep watch over your journal, or become a Witness for someone you care about. It does not require many words. Some days, what we need is not advice or judgment, but simply someone who stays near, remembers, and sees us through. Yearbound makes room for that kind of tender connection. Time Capsule Some feelings need to travel farther, to be met again only after enough time has passed. Time Capsule is a place for those moments. Leave a message from who you are now for who you will be later. When it opens again, it may bring back the air of a forgotten season, along with the beliefs, fears, and hopes you once carried. My Yearbound My Yearbound is where scattered entries gather into a single flow. Daily intentions, returned pages, shared writing, and time capsules begin to connect here as one life. It is not simply where records are stored, but a quiet map that helps you understand the shape of the time you have lived. Privacy and Encryption Every entry is protected with end-to-end AES-256 encryption. From the briefest note to the feelings you could not easily show anyone else, your words remain yours to the end. Yearbound is not made for display, but for honesty. Even your most fragile sentence is held quietly and securely in your own time and language. Tiers Free — 1 volume · 3 lines a day · 1 year of past cards · join as a Witness · invite 3 Witnesses Plus ($29.99 lifetime) — unlimited volumes · full archive · local recordings · join as a Witness · invite 5 Witnesses Pro ($4.99/month · $39.99/year) — write together with 1 invited Pro member · Manifesto · cloud sync · unlimited Witnesses Family ($9.99/month · $79.99/year) — everything in Pro · up to 6 Pro members · 5 additional people · shared volumes Languages Some feelings only reveal themselves fully in a certain language. Every prompt in Yearbound was written separately in English, Korean, Japanese, Spanish, German, and French. They are not translations, but lines born in the grain of each language itself. Three lines are enough. Begin in the language closest to your heart. Terms of Use: https://www.yearbound.app/terms.html Privacy Policy: https://www.yearbound.app/privacy.html

Screenshots

Diffu4 screens
Yearbound4 screens

Verdict

The call

The clearest difference is in-app purchases: Yearbound at none against Diffu's 6. Yearbound also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Diffu sells 6 in-app purchases, starting at $2.99 per month. Yearbound asks for nothing beyond the download.

UpkeepUpdate frequency

Diffu ships an update every 2 weeks, Yearbound every 10 days. The most recent releases landed on September 8, 2026 and September 22, 2026 respectively.

Scorecard2 real differences · 4 level
Diffu versus Yearbound: the parameters behind the verdict, then further details
ParameterDiffuYearbound
PriceFreeFree
Update frequencyEvery 2 weeksEvery 10 days — better
AdsYesNo — better
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size73 MB17 MB
Age rating17+4+
DeveloperJeong-Hwan JangYearbound Studio LLC

In-app purchases

6 purchases

Diffu

Subscriptions2
  • Diffu Premium$2.991 Month
  • Diffu Premium$29.991 Year
One-time4
  • 100 엠버$0.49
  • 500 엠버$2.99
  • 1000 엠버$6.99
Show 1 more
  • 3000 엠버$19.99
None

Yearbound

No in-app purchases

Questions

Is Diffu free?
Diffu is free to download, with in-app purchases available.
Is Yearbound free?
Yearbound is free to download, with no in-app purchases.
Do Diffu or Yearbound have ads?
Diffu shows ads; Yearbound does not.
Which is updated more often, Diffu or Yearbound?
Diffu ships an update every 2 weeks, and Yearbound every 10 days. Most recently, Diffu was updated on September 8, 2026 and Yearbound on September 22, 2026.

Other comparisons