# Inmate Inbox vs .i.s.o.

The clearest difference is review sentiment: .i.s.o. at 100% against Inmate Inbox's 16%. .i.s.o. also leads on rating (5.0 vs 3.1) and update cadence (every 2 weeks vs every 2 months). Inmate Inbox's advantage is monetization model (free with in-app purchases vs subscription) and ratings volume (90 vs 1). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Inmate Inbox sells 4 one-off in-app purchases and .i.s.o. sells 1 in-app purchase, starting at $1.00 per month. Whichever you choose, the download price is not the number that matters.

.i.s.o. holds the better App Store score, 5.0 against 3.1. That said, the two scores are not equally well evidenced: Inmate Inbox has 90 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 16% of Inmate Inbox's written reviews are positive against 100% of .i.s.o.'s.

Inmate Inbox ships an update every 2 months, .i.s.o. every 2 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Inmate Inbox | .i.s.o. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (90 ratings)](https://appshunter.io/ios/app/inmate-inbox/id1390513826/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/iso/id6760863375/reviews)** |
| Number of ratings | **90** | 1 |
| Positive reviews | 16.1% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 34 MB | 69 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Stewart](https://appshunter.io/developer/1390513825) | [brandon owen](https://appshunter.io/developer/1886573511) |

## What reviewers say

### Inmate Inbox

[App page](https://appshunter.io/ios/app/inmate-inbox/id1390513826)

This app facilitates real-time communication between users and incarcerated individuals. It allows for sending and receiving messages, as well as sharing photos, helping to maintain connections with loved ones.

**Highlights:** Real-time messaging, Photo sending, Account management, Contact list management, Stay connected on the go

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| inmateinbox | $5.99 | one-time |
| InmateInbox | $10.99 | one-time |
| InmateInbox | $15.99 | one-time |
| InmateInbox | $20.99 | one-time |


### .i.s.o.

[App page](https://appshunter.io/ios/app/iso/id6760863375)

A calm, ad-free social space for artists and art lovers. Focuses on showcasing art without algorithmic manipulation or profit-driven exploitation. Offers detailed image information and a curated experience.

**Highlights:** No algorithmic feed manipulation, Ad-free experience, Detailed image information (lens, shutter, histogram), Curated discovery of art, User profiles as portraits, Advanced search filters, Screenshot disabling for content protection

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| .i.s.o. | $1.00 | per month |


## Frequently asked questions

### Is Inmate Inbox free?

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

### Is .i.s.o. free?

.i.s.o. is free to download, with in-app purchases available.

### Which has better reviews, Inmate Inbox or .i.s.o.?

.i.s.o. is rated higher. Inmate Inbox averages 3.1 out of 5 from 90 ratings, while .i.s.o. averages 5.0 from 1 ratings.

### Do Inmate Inbox or .i.s.o. have ads?

Neither Inmate Inbox nor .i.s.o. shows ads.

### Which is updated more often, Inmate Inbox or .i.s.o.?

Inmate Inbox ships an update every 2 months, and .i.s.o. every 2 weeks. Most recently, Inmate Inbox was updated on October 25, 2026 and .i.s.o. 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.*