Comparison

Stockr vs Serendipity Planner

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

Head to head
About

Stockr

This app helps you build a habit of reflection by easily recording daily insights, notes, and quotes. AI features provide comments and analysis to support self-discovery and mental well-being.

Highlights
  • Record daily insights and notes
  • AI comments for support
  • Revisit past entries for new discoveries
  • Progress reports and achievements
  • AI-powered self-analysis
  • Value-based diagnostics
Features
Read full description

Over 50,000 downloads! A diary app where insights fuel personal growth. Easily record daily discoveries, reading notes, and memorable quotes to build a habit of reflection. It’s perfect for journaling. Features like AI comments and reports make it fun to keep going, while also aiding in self-analysis and mental well-being! ◇What you can do with Stockr ① "Stock" your insights—anytime, anywhere Record the insights you gain from daily work and life in Stockr before you forget them. No need to organize your thoughts; just write them down exactly as they come to you. By jotting down emotions and ideas the moment they strike, you can use the app as a diary or journaling tool. ② Receive encouragement with "AI Comments" Purchase AI tickets to have Stockr-AI send comments on your entries. It supports your growth from an objective perspective and encourages a consistent reflection habit. ③ Lead to new discoveries with "Rediscovery" The app automatically reminds you of past posts. Add new insights or note how your thinking has evolved—such as "I thought this back then, but now I see it differently." ④ Support your reflection habit with "Reports" The more you use Stockr, the more points you accumulate, visualizing the results of your reflection habit. Plus, earn delightful "titles" and "badges" based on your usage and scores to boost your motivation! ⑤ Deepen self-understanding with "AI Diagnosis" AI analyzes and diagnoses patterns in your entries to support self-understanding. You might even discover a new side of yourself. (Stockr Premium feature) You can also use AI tickets for a "Values ​​Diagnosis," which analyzes your entries to identify the values ​​you hold dear. ◇ Recommended for: - Those looking for a simple, easy-to-maintain diary app - Those who want to practice journaling by freely writing down whatever comes to mind - Those who want an easy way to record and express thoughts and ideas gained from reading, seminars, or study sessions - Those who are conscious of gathering information but struggle to find opportunities to put those insights into practice - Those who love taking notes but want something different from standard note-taking apps - Those who want to boost their self-esteem by recognizing their achievements and the progress they’ve made - Those who want to practice mental self-care by recording their daily thoughts and emotions Stockr aims to be a user-friendly app that truly supports your daily life. If you have any thoughts or feedback, please share them on X (formerly Twitter) using the hashtag **#Stockr**! Our development team reviews all feedback to help us improve the service. We also share information on other platforms to help you make "reflection" a habit and lead a more fulfilling life! ** Voicy by the Stockr Product Owner** Tips and techniques for making reflection casual, fun, and effective. [Listen on Voicy](https://voicy.jp/channel/821340) **3-Month Guided Program** A special program designed to help you build a reflection habit, experience personal growth, and lead a fulfilling life. Through workshops and lectures, we provide dedicated support to help you grow into the person you want to be. [Learn more here](https://stockr-habit-program2.peatix.com/)

About

Serendipity Planner

Features
Read full description

Thirty minutes between two meetings. It usually disappears before you decide what to do with it. Serendipity Planner looks at your calendar, finds the gaps, and suggests a way to spend them. ■ Finds the gaps for you It reads your calendar and tells you where today has room. You don't have to go looking. ■ Picks by weather and place Outside when it's clear, indoors when it isn't. It points you to a café, a park or a bookshop near where you already are. ■ Set where you're headed Going somewhere today? Name the place, and suggestions come from around there instead. You arrive knowing what's nearby. ■ It learns as you go The app remembers what you pick and gradually leans toward what you like. ■ A widget for the next gap Your next free window, and an idea for it, on your home screen. Languages: Japanese, English, Korean, Spanish, French Your calendar is read only to find free time. The contents of your events never leave your device.

Screenshots

Stockr4 screens
Serendipity Planner4 screens

Verdict

The call

The clearest difference is in-app purchases: Serendipity Planner at none against Stockr's 14. Serendipity Planner 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. Stockr sells 13 in-app purchases, starting at $2.99 per 7 days. Serendipity Planner asks for nothing beyond the download.

UpkeepUpdate frequency

Stockr ships an update fortnightly, Serendipity Planner every 3 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 8 level
Stockr versus Serendipity Planner: the parameters behind the verdict, then further details
ParameterStockrSerendipity Planner
PriceFreeFree
Rating3.0 (1 ratings) — better—
Positive reviews77.8% of reviews—
Number of ratings1 — better—
Update frequencyFortnightly — betterEvery 3 weeks
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size135 MB5 MB
Age rating4+4+
DeveloperBuild It Inc.Ken Miyamura

In-app purchases

13 purchases

Stockr

Subscriptions10
  • 1週間プラン(非推奨)$2.997 Days
  • プレミアム会員(月額プラン)$5.991 Month
  • 1ヶ月プラン2 variants$19.991 Month
Show 7 more
  • 3ヶ月プラン$22.993 Months
  • 3ヶ月プラン7 Days trial$39.993 Months
  • 3ヶ月プラン$39.993 Months
  • プレミアム会員(年間プラン)$39.991 Year
  • 12ヶ月プラン$69.991 Year
  • 12ヶ月プラン7 Days trial$119.991 Year
  • 12ヶ月プラン$119.991 Year
One-time3
  • AIチケット(1枚)$0.99
  • AIチケット(7枚)$2.99
  • AIチケット(20枚)$6.99
None

Serendipity Planner

No in-app purchases

Questions

Is Stockr free?
Stockr is free to download, with in-app purchases available.
Is Serendipity Planner free?
Serendipity Planner is free to download, with no in-app purchases.
Do Stockr or Serendipity Planner have ads?
Stockr shows ads; Serendipity Planner does not.
Which is updated more often, Stockr or Serendipity Planner?
Stockr ships an update fortnightly, and Serendipity Planner every 3 weeks. Most recently, Stockr was updated on October 25, 2026 and Serendipity Planner on October 24, 2026.

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