Comparison

ThreeLinesDiary vs InstantToDo

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

Head to head
About

ThreeLinesDiary

A simple journaling app designed to improve sleep quality by encouraging users to write a three-line diary entry before bed. It allows for photo attachments and provides daily reminders to help build a consistent writing habit.

Highlights
  • Three-line daily journal entries
  • Attach photos to entries
  • Daily writing reminders
  • Improve sleep quality
  • Simple and intuitive interface
Features
Read full description

Write become just're autonomic nerve health. Write before going to bed, sleep quality is improved. 3-line diary which is said to have this effect. This app is an app that aims to write such a three-line diary. The has been prepared three items we wrote so good a word. In some cases, you might want be left with a photograph. In this app, you can save with a photo for each of the three items. Also to write every day, you might forget. In this app, by making a notification to the specified time, you will be able to habit to write at the same time each day.

About

InstantToDo

Manage your tasks with a visually appealing and personalized to-do list. Customize backgrounds with colors or photos to boost motivation and organize tasks by category with notifications and subtasks.

Highlights
  • Colorful, personalized task creation
  • Category organization
  • Customizable themes, palettes, and templates
  • Deadline notifications
  • Subtask functionality
  • Customizable app icon
Features
Read full description

【What is InstantTodo?】 InstantTodo is a ToDo app that allows you to manage tasks in a colorful and personalized way, featuring a familiar thumbnail-style design reminiscent of social media platforms. Create vibrant tasks with various colors and photos as backgrounds, making your ToDo app truly unique to you. It also boasts a range of useful features, such as category organization, notifications, and subtask functionality. InstantToDo aims to boost motivation for completing tasks by letting you set your favorite colors or images as backgrounds. Set a cherished family photo or your favorite celebrity as the background image, and watch your motivation skyrocket just to see it! Customize your ToDo app to make it one-of-a-kind in the world. While the free plan offers plenty of features for you to utilize, consider upgrading to the Silver or Gold plans if you’re looking for even more functionality. Depending on the plan, you’ll gain access to unlimited category creation and advanced notification features, enabling even more efficient task management. 【App Features】 ■Create colorful, personalized tasks ■Easily organize tasks with the category feature ■Pursue personalization with themes, palettes, and templates ■Never forget deadlines with the notification feature ■Break down large tasks with the subtask feature ■Personalize your app icon 【Why did we create this app?】 We wanted to create an app that would be perfect for unique individuals who value their personal style, like Japanese actress and YouTuber Naka Riisa, who constantly takes on various challenges and tackles numerous tasks every day. With the theme of “colorful and true to yourself,” we significantly updated this app, which was originally centered around the concept of photo-based to-dos. In the past, we tried using several to-do apps, but somehow, we always ended up not using them after a while. We wondered, “Why?” The reason was simple: managing tasks with to-do apps wasn’t fun. Opening the app felt lifeless, and the ever-growing list of tasks felt overwhelming and frustrating. It might be understandable that to-do apps, which primarily evolved as business tools from pen and paper, aren’t fun. However, we thought there could be a to-do app that excites you when you open it, one that you can’t help but look at even when there’s nothing new, and that just by looking at it, your heart leaps with joy. Like creating your own unique notebook with multiple colored pens when you were a student, we wanted InstantToDo to be that kind of self-satisfying, yet inviting app. A one-of-a-kind, colorful, and personalized notebook in the digital world. InstantToDo aimed to make completing tasks enjoyable and creating tasks fun. We believed that even when looking at a long list of accumulated tasks in the app, seeing them surrounded by your favorite colors and things would help boost your motivation. We envisioned InstantToDo as an app that not only keeps you organized but also brings joy and excitement to your daily life. By customizing the app to reflect your preferences, you’ll be inspired to complete your tasks and stay engaged with the app. In a world where most to-do apps are purely utilitarian, InstantToDo stands out by offering a personalized and vibrant experience. We wanted to make managing tasks not just about getting things done but also about self-expression and enjoying the process. Ultimately, our goal with InstantToDo was to create a to-do app that’s a pleasure to use and encourages users to stay motivated and connected to their goals in a fun, colorful way. By giving you the tools to make your task management experience truly your own, we hope that InstantToDo becomes an essential part of your daily routine and helps you achieve your goals with a smile on your face. ■about Privacy https://yukio.site/privacy-policy/ ■terms of service https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

ThreeLinesDiary4 screens
InstantToDo4 screens

Verdict

The call

The clearest difference is in-app purchases: ThreeLinesDiary at none against InstantToDo's 3. ThreeLinesDiary also leads on review sentiment (75% vs 67%). InstantToDo's advantage is update cadence (every 3 weeks vs every 6 months) and iOS requirement (12.0 vs 15.0). On price, ads 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. InstantToDo sells 3 in-app purchases, starting at $0.99 per month. ThreeLinesDiary asks for nothing beyond the download.

UpkeepUpdate frequency

ThreeLinesDiary ships an update every 6 months, InstantToDo every 3 weeks. Both last shipped on October 24, 2026.

Scorecard5 real differences · 5 level
ThreeLinesDiary versus InstantToDo: the parameters behind the verdict, then further details
ParameterThreeLinesDiaryInstantToDo
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews75.0% of reviews — better66.7% of reviews
Number of ratings—1 — better
Update frequencyEvery 6 monthsEvery 3 weeks — better
AdsYesYes
In-app purchasesNo — betterYes
MonetizationAd-supported — betterFree with in-app purchases
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.012.0 — better
Further details — not scored
Size7 MB98 MB
Age rating4+4+
DeveloperSeiji Naganoyuki okada

Customer experience

ThreeLinesDiary

Written reviews4 reviews
Positive75.0%
Neutral25.0%
Negative0.0%

InstantToDo

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews9 reviews
Positive66.7%
Neutral22.2%
Negative11.1%

In-app purchases

None

ThreeLinesDiary

No in-app purchases

3 purchases

InstantToDo

Subscriptions3
  • SILVER PLAN / Monthly$0.991 Month
  • GOLD PLAN / Monthly$1.991 Month
  • GOLD PLAN / Yearly$24.991 Year

Questions

Is ThreeLinesDiary free?
ThreeLinesDiary is free to download, with no in-app purchases.
Is InstantToDo free?
InstantToDo is free to download, with in-app purchases available.
Do ThreeLinesDiary or InstantToDo have ads?
Both ThreeLinesDiary and InstantToDo show ads.
Which is updated more often, ThreeLinesDiary or InstantToDo?
ThreeLinesDiary ships an update every 6 months, and InstantToDo every 3 weeks. Most recently, ThreeLinesDiary was updated on October 24, 2026 and InstantToDo on October 24, 2026.

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