BLKFLEX vs SoStack
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BLKFLEX
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.
- Curated content feed
- Sophisticated social networking
- Connect with elite users
- Elevated social experience
- Sleek interface
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Introducing BLKFLEX: The epitome of sleek sophistication in social networking. Elevate your connections with curated content and engage with the coolest crowd. Upgrade your social game today.
SoStack
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.
- Private group messaging
- Shared calendars and events
- RSVP and planning tools
- Follow verified public groups
- Invite via SMS
- Location-based discovery
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SoStack is a communication and coordination platform built for real-world groups. Create private group chats, plan together with shared calendars, and follow verified public groups to stay up to date on what’s happening near you. What you can do with SoStack Private group messaging: Create 1:1 and group chats for friends, teams, families, and communities. Shared calendars + events: Create events in group calendars, add events to your own calendar view, and keep plans in one place. RSVP and planning: Mark events as interested/going and coordinate details with your group. Discover and follow public groups (SoStack Plus): Find local businesses, organizations, and communities, follow them, and see upcoming events and updates. Invite by phone: Invite people to private groups via SMS links, and optionally match contacts to existing SoStack users (with permission). Location-based discovery (optional): Use a city or current location to filter nearby results. Built with safety and control Account deletion in-app: Delete your account from Settings. Privacy-first by design: Messages are protected by access controls, and you control permissions like contacts and location in your device settings.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | BLKFLEX | SoStack |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) | 5.0 (3 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 2 | 3 — better |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 78 MB | 43 MB |
| Age rating | 17+ | 12+ |
| Developer | BLKFUSE CORPORATION | SOSTACK LIMITED LIABILITY COMPANY |
Customer experience
BLKFLEX
SoStack
In-app purchases
BLKFLEX
No in-app purchases
SoStack
No in-app purchases









