# Secret Contacts: Locked Book — Encrypted phone list, Face ID

> Encrypted phone list, Face ID (iPhone/iPad app by MIZOU, CO., LTD..)

- Source: https://appshunter.io/ios/app/secret-contacts-locked-book/id6777983483 (this page in markdown: same URL + `.md`)
- Developer: [MIZOU, CO., LTD.](https://appshunter.io/developer/1542553141)
- Category: Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 18.0 · 5 MB
- Languages: Canadian English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French (France), German (Germany) and 23 more
- Released: 2026-06-15
- Data updated: 2026-09-10
- User reviews in markdown: https://appshunter.io/ios/app/secret-contacts-locked-book/id6777983483/reviews.md

## What is Secret Contacts?

Two address books are better than one.

The contacts app that came with your phone is fine for most of the people in your life. This one is for the rest of them. It opens with a code only you know, and shows nothing at all until it does.

Setting it up takes about ten seconds
Choose four digits the first time you launch the app. They have nothing to do with the code on your Lock Screen, and neither one will open the other. After that it is four taps — or a glance, once you switch Face ID on.

An entry can hold
A name. A phone number. An email address. And a memo line, which is where most of the useful part tends to end up: how you met, which of the numbers is the work one, what was said last time, what you still owe.

It shuts itself
There is no lock button to remember and no timer to configure. Swipe up, take a call, check a message — by the time you come back it is asking for the code again.

Where the numbers actually sit
Inside this phone, in a file AES-GCM has already scrambled, with the key held in the device keychain. Nothing is uploaded, because there is nowhere to upload it to: the app has no account system and never asks for an email address. Switch the network off completely and it behaves exactly the same.

One warning. Uninstalling the app takes the entries with it, permanently, and nobody — the developer included — can bring them back. Write your four digits down somewhere safe.

Ads cover the cost of the app. A single in-app purchase turns them off for good.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |



## Version history (last 5 releases)

### 1.1.0 — 2026-09-05

The app is now called Secret Book, so the name under the icon on your Home Screen changes with it.
Numbers and email addresses now sit behind dots in the list. Tap a row and only that one entry opens.
Added a search that covers names, numbers and memos, plus letter headings and an index down the right edge.
The lock screen and passcode setup were rebuilt: a dark screen with the number pad right on it, no separate sheet.

### 1.0.3 — 2026-08-27

Fixed several bugs found while testing this release.
Permission prompts now explain themselves in your language.

### 1.0.2 — 2026-07-22

軽微な改善とバグ修正を行いました。

### 1.0.1 — 2026-07-07

This update adds support for many more languages, plus minor improvements.

### 1.0 — 2026-06-15

No release notes.

## More apps by MIZOU, CO., LTD.

- [Brass Bands](https://appshunter.io/ios/app/brass-bands/id1542553139)
- [Super Wind Orchestra Piano](https://appshunter.io/ios/app/super-wind-orchestra-piano/id1640956919)
- [MusicDictionary](https://appshunter.io/ios/app/musicdictionary/id1641304793)
- [Design Checkers](https://appshunter.io/ios/app/design-checkers/id6448617058)
- [flutter widget](https://appshunter.io/ios/app/flutter-widget/id6448849730)
- [Haptic Metronom](https://appshunter.io/ios/app/haptic-metronom/id6450217797)

All apps by MIZOU, CO., LTD.: https://appshunter.io/developer/1542553141

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-10.*