# ThreeLinesDiary vs InstantToDo

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.

Both are free to download. InstantToDo sells 3 in-app purchases, starting at $0.99 per month. ThreeLinesDiary asks for nothing beyond the download.

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

## The numbers

| Metric | ThreeLinesDiary | InstantToDo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/instanttodo-cute-and-simple/id1537738368/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | **75.0% of reviews** | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 7 MB | 98 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Seiji Nagano](https://appshunter.io/developer/689628441) | [yuki okada](https://appshunter.io/developer/1505937141) |

## What reviewers say

### ThreeLinesDiary

[App page](https://appshunter.io/ios/app/threelinesdiary/id1161808671)

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:** macOS Compatibility

**In-app purchases:** none


### InstantToDo

[App page](https://appshunter.io/ios/app/instanttodo-cute-and-simple/id1537738368)

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:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SILVER PLAN / Monthly | $0.99 | per month |
| GOLD PLAN / Monthly | $1.99 | per month |
| GOLD PLAN / Yearly | $24.99 | per year |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*