# 寄信助手 vs 小黑 OmniBox

The clearest difference is rating: 寄信助手 at 5.0 against 小黑 OmniBox's 1.0. 寄信助手 also leads on in-app purchases (none vs 10) and ratings volume (3 vs 1). 小黑 OmniBox's advantage is update cadence (weekly vs every 3 months). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. 小黑 OmniBox sells 7 one-off in-app purchases. 寄信助手 asks for nothing beyond the download.

寄信助手 holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

寄信助手 ships an update every 3 months, 小黑 OmniBox weekly. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | 寄信助手 | 小黑 OmniBox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/id6475414542/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/omnibox/id6758195223/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 76 MB | 81 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [志超 尹](https://appshunter.io/developer/1516211321) | [Hangzhou Xiaohei Intelligent Technology Co. Ltd](https://appshunter.io/developer/1854656540) |

## What reviewers say

### 寄信助手

[App page](https://appshunter.io/ios/app/id6475414542)

This app bridges the gap between correctional facilities and families by offering secure communication services. It allows users to send handwritten letters, custom postcards, and printed photos to incarcerated loved ones. Additionally, it provides access to facility information, legal insights, and lawyer consultations.

**Highlights:** Send handwritten letters, Customizable postcards, High-definition photo printing, Correctional facility information lookup, Legal sentencing and parole prediction, Case database and legal Q&A, Online lawyer consultations

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

**In-app purchases:** none


### 小黑 OmniBox

[App page](https://appshunter.io/ios/app/omnibox/id6758195223)

This AI-powered tool helps manage fragmented information by collecting, organizing, and retrieving your knowledge. It offers features like whole-web saving, multi-format uploads, and AI-driven Q&A based on your personal knowledge base. Collaborate with others and access your information across multiple devices.

**Highlights:** AI-powered knowledge management, Whole-web and multi-format collection, AI Q&A on private knowledge base, Intelligent semantic search, Multi-device synchronization, Team collaboration space

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Add-ons | $0.99 | one-time |
| Upgrade | $0.99 | one-time |
| Upgrade | $1.99 | one-time |
| Upgrade | $5.99 | one-time |
| Upgrade | $8.99 | one-time |
| Upgrade | $14.99 | one-time |
| Upgrade | $59.99 | one-time |


## Frequently asked questions

### Is 寄信助手 free?

寄信助手 is free to download, with no in-app purchases.

### Is 小黑 OmniBox free?

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

### Which has better reviews, 寄信助手 or 小黑 OmniBox?

寄信助手 is rated higher. 寄信助手 averages 5.0 out of 5 from 3 ratings, while 小黑 OmniBox averages 1.0 from 1 ratings.

### Do 寄信助手 or 小黑 OmniBox have ads?

Neither 寄信助手 nor 小黑 OmniBox shows ads.

### Which is updated more often, 寄信助手 or 小黑 OmniBox?

寄信助手 ships an update every 3 months, and 小黑 OmniBox weekly. Most recently, 寄信助手 was updated on November 4, 2026 and 小黑 OmniBox 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.*