Comparison

Rocket Memo vs Simple Diary

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

Head to head
About

Rocket Memo

Capture thoughts instantly with this fast and organized notepad. Set reminders for important notes and find anything quickly with a powerful search. Designed for seamless idea management.

Highlights
  • Instant thought capture
  • Tag-based organization
  • Lightning-fast search
  • Note reminders
  • Clean editor
Features
Read full description

Simple. Fast. Smart. Capture your thoughts instantly and keep them perfectly organized. A sleek, lightweight notes app designed to move as fast as your ideas. Write Write the moment inspiration strikes. A clean and focused editor helps you stay in the flow—no distractions, no delays. Organize Stay organized with tags. Work, personal notes, ideas, lists—create your own simple yet powerful system of organization. Search Find what you need, instantly. A lightning-fast search engine filters thousands of notes in a flash. Remind Forget nothing. Set reminders for important notes and get notified right on time. Whether you’re working, planning, or just thinking out loud, this app keeps up with your mind—simple, functional, and beautifully fast.

About

Simple Diary

Features
Read full description

Forget the pressure of writing long entries. This app makes journaling simple and fun, letting you quickly jot down a single thought, a quick feeling, or the day's highlight. It's designed to fit seamlessly into your busy life, helping you build a positive habit without the fuss. "What's on your mind today?" "How was that meeting?" "Did something make you smile?" Your one-liners become a personal timeline, a digital scrapbook of your journey. Easily look back at your entries through a clean calendar view or a simple list, and rediscover those small, significant moments that make up your unique story. It's about making mindfulness easy and accessible. If you're looking for a simple way to reflect, track your mood, or just keep a quick record of your days, the "One-Liner Journal" is perfect for you. Start capturing your story, one line at a time!

Screenshots

Rocket Memo4 screens
Simple Diary2 screens

Verdict

The call

The clearest difference is in-app purchases: Simple Diary at none against Rocket Memo's 5. Simple Diary also leads on iOS requirement (16.6 vs 18.0). Rocket Memo's advantage is ads (none vs shown) and update cadence (every 10 days vs every 3 months). On price and device support 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. Rocket Memo sells 5 in-app purchases, starting at $0.99 per month. Simple Diary asks for nothing beyond the download.

UpkeepUpdate frequency

Rocket Memo ships an update every 10 days, Simple Diary every 3 months. The most recent releases landed on October 2, 2026 and October 6, 2026 respectively.

Scorecard4 real differences · 4 level
Rocket Memo versus Simple Diary: the parameters behind the verdict, then further details
ParameterRocket MemoSimple Diary
PriceFreeFree
Positive reviews80.0% of reviews—
Update frequencyEvery 10 days — betterEvery 3 months
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.016.6 — better
Further details — not scored
Size6 MB8 MB
Age rating4+4+
DeveloperYoshinori KasayaKana Uchida

In-app purchases

5 purchases

Rocket Memo

Subscriptions2
  • Rocket Pro Monthly$0.991 Month
  • Rocket Pro Yearly$5.991 Year
One-time3
  • Small Coffee$0.99
  • Croissant & Coffee$3.99
  • Cake & Coffee$9.99
None

Simple Diary

No in-app purchases

Questions

Is Rocket Memo free?
Rocket Memo is free to download, with in-app purchases available.
Is Simple Diary free?
Simple Diary is free to download, with no in-app purchases.
Do Rocket Memo or Simple Diary have ads?
Simple Diary shows ads; Rocket Memo does not.
Which is updated more often, Rocket Memo or Simple Diary?
Rocket Memo ships an update every 10 days, and Simple Diary every 3 months. Most recently, Rocket Memo was updated on October 2, 2026 and Simple Diary on October 6, 2026.

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