# ONSTA vs Private Diary & Lock

The clearest difference is device support: Private Diary & Lock at 3 against ONSTA's 1. Private Diary & Lock also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. ONSTA sells 2 in-app purchases, starting at $29.99 per month and Private Diary & Lock sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ONSTA ships an update every 3 days, Private Diary & Lock every 5 days. The most recent releases landed on October 29, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | ONSTA | Private Diary & Lock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/private-diary-and-lock-scriptum/id6803934474/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 5 days |
| Monetization | — | Freemium |
| Size | 62 MB | 48 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [HELCOO AI Developing Services L.L.C S.O.C](https://appshunter.io/developer/1883461478) | [ANNR Studio](https://appshunter.io/developer/6785540709) |

## What reviewers say

### ONSTA

[App page](https://appshunter.io/ios/app/onsta/id6801993828)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ONSTA Unlimited Monthly | $29.99 | per month |
| ONSTA Unlimited Yearly | $299.99 | per year |


### Private Diary & Lock

[App page](https://appshunter.io/ios/app/private-diary-and-lock-scriptum/id6803934474)

This app provides a private digital journal experience where all entries are stored locally on your device. It offers daily prompts, voice-to-text input, photo attachments, and robust search capabilities. An optional upgrade unlocks advanced features like biometric lock, AI tidying, and PDF export.

**Highlights:** Daily writing prompts, Voice-to-text input, Photo and location attachments, Local storage and iCloud backup, Searchable journal entries, Optional AI writing assistance, PDF export

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Yearly | $22.99 | per year |
| Lifetime | $34.99 | one-time |


## Frequently asked questions

### Is ONSTA free?

ONSTA is free to download, with in-app purchases available.

### Is Private Diary & Lock free?

Private Diary & Lock is free to download, with in-app purchases available.

### Do ONSTA or Private Diary & Lock have ads?

Neither ONSTA nor Private Diary & Lock shows ads.

### Which is updated more often, ONSTA or Private Diary & Lock?

ONSTA ships an update every 3 days, and Private Diary & Lock every 5 days. Most recently, ONSTA was updated on October 29, 2026 and Private Diary & Lock on November 6, 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.*