# BLKFLEX vs SoStack

The clearest difference is update cadence: SoStack at every 3 weeks against BLKFLEX's every 2 months. On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for BLKFLEX against 5.0 for SoStack. Both are backed by a comparable volume of ratings — 2 and 3 respectively.

BLKFLEX ships an update every 2 months, SoStack every 3 weeks. Both last shipped on October 10, 2026.

## The numbers

| Metric | BLKFLEX | SoStack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/blkflex/id6476505789/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/sostack/id6759353874/reviews) |
| Number of ratings | 2 | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 78 MB | 43 MB |
| Requires iOS | 16.6 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 17+ | 12+ |
| Developer | [BLKFUSE CORPORATION](https://appshunter.io/developer/1538460491) | [SOSTACK LIMITED LIABILITY COMPANY](https://appshunter.io/developer/1878252494) |

## What reviewers say

### BLKFLEX

[App page](https://appshunter.io/ios/app/blkflex/id6476505789)

A social networking app focused on curated content and connecting with a sophisticated user base. It aims to enhance your social interactions and elevate your online presence.

**Highlights:** Curated content feed, Sophisticated social networking, Connect with elite users, Elevated social experience, Sleek interface

**Features:** macOS Compatibility

**In-app purchases:** none


### SoStack

[App page](https://appshunter.io/ios/app/sostack/id6759353874)

This app facilitates group communication and coordination with private chats and shared calendars. Plan events, manage RSVPs, and discover local public groups for updates. It prioritizes user control and privacy with in-app account deletion.

**Highlights:** Private group messaging, Shared calendars and events, RSVP and planning tools, Follow verified public groups, Invite via SMS, Location-based discovery

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

**In-app purchases:** none


## Frequently asked questions

### Is BLKFLEX free?

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

### Is SoStack free?

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

### Which has better reviews, BLKFLEX or SoStack?

BLKFLEX and SoStack are both rated 5.0 out of 5 on the App Store, from 2 and 3 ratings respectively.

### Do BLKFLEX or SoStack have ads?

Neither BLKFLEX nor SoStack shows ads.

### Which is updated more often, BLKFLEX or SoStack?

BLKFLEX ships an update every 2 months, and SoStack every 3 weeks. Most recently, BLKFLEX was updated on October 10, 2026 and SoStack on October 10, 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.*