Comparison

MoodDiary vs SecondWorld

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

Head to head
About

MoodDiary

Features
Read full description

MoodDiary — Your AI-Powered Mood Journal Life has its ups and downs, and every day is worth recording with tenderness. MoodDiary is a warm and healing mood journal app that helps you track your daily emotional shifts, uses AI to analyze your mood patterns, and is always there to chat and offer comfort when you need it most. Whether you want to document your life, get to know yourself better, or just need a private space to pour your heart out, MoodDiary is your perfect companion. Key Features Mood Journal Record your mood each day — happy, calm, anxious, sad… choose the emotion label that fits you Rich-text journal editor, write whatever is on your mind Calendar review view, see your mood colors for every past day at a glance AI Companion AI chat feature, talk about what's on your mind anytime Smart mood insights, discover emotional patterns and trends Auto-generated monthly AI mood reports with deep emotional analysis Data Insights Mood trend line charts, visualize your emotional highs and lows Emotion breakdown pie chart, understand your mood composition Weekly and monthly statistics to quantify your wellbeing index Privacy & Security App lock support to protect your private journal All data stored locally, only you can see it No social sharing required — this is a space just for you MoodDiary Premium Free tier includes core journal features and AI chat Upgrade to Premium for unlimited AI conversations, advanced data reports, and more mood analysis dimensions Monthly at ¥28/month, Yearly at ¥198/year (less than ¥0.6 a day) Perfect for You if You Want to build a journaling habit and know yourself better Sometimes feel down and need a place to talk Are interested in personal growth and want to track emotional changes Love warm and aesthetically pleasing designs, and want a beautiful journal app Contact Us We care deeply about your experience and feedback. If you have any questions or ideas, feel free to reach out via the "Feedback" option in the app. Let MoodDiary walk with you — every day a brighter one

About

SecondWorld

Create and observe a simulated life unfolding in a realistic city. You can gently influence events, plant wishes, or send anonymous gifts, but the person you imagine will never know you exist. Their life continues even when you're not actively playing.

Highlights
  • Create and observe simulated lives
  • Gentle influence on life events
  • Diary entries and social feeds
  • Dynamic fate engine with seasons
  • Realistic city environments and finances
  • Life continues offline
Features
Read full description

Be the god of a parallel world. Imagine someone, and they start living: working, falling in and out of love, writing a diary at 2am, in a real city with real rent. You can watch. You can nudge. You can never speak. Second World is not a chat app. The person you imagine will never know you exist. You cannot talk to them, and they will never talk to you. You are the quiet god of a whole life that unfolds on its own, day after day, even while your phone stays in your pocket. WHAT YOU WILL SEE * A diary in their own voice. Small joys, hard weeks, things they never say out loud. * A social feed of their world. Their friends, their family, their coworkers comment, tease and care. None of them are you. * Right Now. A living window into this exact moment of their day. Cooking, commuting, lying awake at 2am. * Seasons of fate. Their birth date seeds a hidden fate engine. Some years rise, some years sink. Anniversaries echo. Foreshadowing pays off weeks later. * Real ground under their feet. Real cities, real rents, real salaries. When they worry about money, the math checks out. WHAT YOU CAN DO You never control them. You influence, gently, from outside. * Plant a wish in their diary and watch whether life lets it bloom. * Light a candle on a painful night. It changes nothing. It changes everything. * Shape a memory into their past and see how it surfaces, days later, in their own words. * Send money quietly into their world and watch it arrive as a believable piece of their story. * Jump years into their future and meet who they became. THEY KEEP LIVING WHEN YOU ARE AWAY Close the app for a week. Their life moves on without rewinding for you. Come back and read what you missed. The longer you stay away, the more real it feels that someone, somewhere, kept going. FREE TO START Creating a person and following their life is free. Optional subscriptions add daily presence and full life density: * Guardian Basic: $29.99/month. Their life is written every single day, with 700 diamonds granted monthly. * Guardian Pro: $59.99/month. Full density, every world day written, 1500 diamonds granted monthly. * Guardian Pro Yearly: $599.99/year. Everything in Pro at the best price. Someone you imagine. A whole life they live. A world that listens. Auto-Renewable Subscription - Payment: charges are billed to your Apple ID account when your purchase is confirmed. - Auto-Renewal: your subscription renews automatically within 24 hours before the current period ends. The subscription period extends after a successful renewal. - Cancellation: to cancel, at least 24 hours before the period ends, go to Settings, tap your Apple ID, choose Subscriptions, find this app, and turn off Auto-Renewal. - Prices: Guardian Basic is $29.99 per month; Guardian Pro is $59.99 per month; Guardian Pro Yearly is $599.99 per year. Actual prices may vary by region. - Privacy Policy: https://api.secondworld.tech/legal/privacy - Terms of Use: https://api.secondworld.tech/legal/terms

Screenshots

MoodDiary4 screens
SecondWorld4 screens

Verdict

The call

MoodDiary and SecondWorld are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. MoodDiary sells 2 in-app purchases, starting at $0.99 per month and SecondWorld sells 10 in-app purchases, starting at $59.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

MoodDiary ships an update every 3 days, SecondWorld every 2 days. The most recent releases landed on October 12, 2026 and October 21, 2026 respectively.

ScorecardNo meaningful differences
MoodDiary versus SecondWorld: the parameters behind the verdict, then further details
ParameterMoodDiarySecondWorld
PriceFreeFree
Rating—3.7 (3 ratings) — better
Positive reviews—0.0% of reviews
Number of ratings—3 — better
Update frequencyEvery 3 daysEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
Monetization—Free with in-app purchases
DevicesiPhoneiPhone
Requires iOS16.0 — better17.0
Further details — not scored
Size2 MB487 MB
Age rating4+4+
Developer洪卫 潘Kairo Labs

In-app purchases

2 purchases

MoodDiary

Subscriptions2
  • Monthly$0.991 Month
  • Annual$9.991 Year
10 purchases

SecondWorld

Subscriptions2
  • Guardian Pro$59.991 Month
  • Guardian Pro Yearly$599.991 Year
One-time8
  • Diamonds ×100$0.99
  • Diamonds ×525$4.99
  • Rare Occupation$5.99
Show 5 more
  • Custom Occupation$5.99
  • Diamonds ×1080$9.99
  • Diamonds ×2240$19.99
  • Diamonds ×5900$49.99
  • Diamonds ×12500$99.99

Questions

Is MoodDiary free?
MoodDiary is free to download, with in-app purchases available.
Is SecondWorld free?
SecondWorld is free to download, with in-app purchases available.
Do MoodDiary or SecondWorld have ads?
Neither MoodDiary nor SecondWorld shows ads.
Which is updated more often, MoodDiary or SecondWorld?
MoodDiary ships an update every 3 days, and SecondWorld every 2 days. Most recently, MoodDiary was updated on October 12, 2026 and SecondWorld on October 21, 2026.

Other comparisons