# ThreeLinesDiary vs PRISM

The clearest difference is ads: PRISM at none against ThreeLinesDiary's shown. PRISM also leads on iOS requirement (13.0 vs 15.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ThreeLinesDiary ships an update every 6 months, PRISM every 4 months. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | ThreeLinesDiary | PRISM |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Every 4 months** |
| Monetization | Ad-supported | — |
| Size | 7 MB | 24 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Seiji Nagano](https://appshunter.io/developer/689628441) | [ZINWELL CORPORATION](https://appshunter.io/developer/1019370251) |

## 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


### PRISM

[App page](https://appshunter.io/ios/app/prism-60ghz-management/id6755796286)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ThreeLinesDiary free?

ThreeLinesDiary is free to download, with no in-app purchases.

### Is PRISM free?

PRISM is free to download, with no in-app purchases.

### Do ThreeLinesDiary or PRISM have ads?

ThreeLinesDiary shows ads; PRISM does not.

### Which is updated more often, ThreeLinesDiary or PRISM?

ThreeLinesDiary ships an update every 6 months, and PRISM every 4 months. Most recently, ThreeLinesDiary was updated on November 2, 2026 and PRISM on November 5, 2026.

---

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