# Topicbraid: MQTT Design — Map Topics, Wildcards, ACLs

> Map Topics, Wildcards, ACLs (iPhone/iPad app by Robert Corbin.)

- Source: https://appshunter.io/ios/app/topicbraid-mqtt-design/id6792557989 (this page in markdown: same URL + `.md`)
- Developer: [Robert Corbin](https://appshunter.io/developer/1890247992)
- Category: Developer Tools, Utilities
- Price: $1.99 (on sale, was $2.99)
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English
- Released: 2026-07-29
- Data updated: 2026-09-06
- User reviews in markdown: https://appshunter.io/ios/app/topicbraid-mqtt-design/id6792557989/reviews.md

## What is Topicbraid?

Topicbraid is an offline workbench for reasoning about MQTT topic namespaces and access-control rules.

The app opens straight into a single dashboard built around a worked broker scenario. At the top, the Authorization probe lets you pick a principal, choose Subscribe or Publish, and type any topic — you get an instant Allow or Deny verdict computed with real MQTT semantics: deny rules take precedence over grants, QoS ceilings are enforced, retained publications require explicit permission, and $-prefixed system topics are never matched by a leading wildcard. Below it, the Observed namespace tree rolls up message counts and byte totals for every branch, the ACL scope chart plots the wildcard breadth of each rule (green for allow, red for deny), and the privilege findings ledger automatically flags risky grants.

FEATURES
- Live Allow/Deny probe with correct + and # wildcard matching
- Deny-precedence evaluation, QoS ceilings, retained-flag checks
- Indented topic tree with per-branch message and byte rollups
- Wildcard-breadth chart across the full rule set
- Automatic findings: unbounded # subtrees, retained QoS 2 write grants

PREMIUM BY DESIGN
One-time paid download. No account, no ads, no analytics, no tracking, and no network access — everything runs on your device, fully offline.


## Version history (last 2 releases)

### 1.1 — 2026-08-31

Version 1.1 is a focused redesign: Topicbraid now opens directly into a single fast MQTT ACL workbench. Probe any topic for an instant Allow or Deny verdict with real wildcard and deny-precedence semantics, scan the namespace tree with message and byte rollups, and review automatic privilege findings — all on one screen.

### 1.0 — 2026-07-29

No release notes.

## More apps by Robert Corbin

- [Daily Word Journey](https://appshunter.io/ios/app/daily-word-journey/id6761548266)
- [Hush Secret Text](https://appshunter.io/ios/app/hush-secret-text/id6761658175)
- [Renew Guard](https://appshunter.io/ios/app/renew-guard/id6761755447)
- [Receipt to PDF](https://appshunter.io/ios/app/receipt-to-pdf/id6761782025)
- [Route Your Pay](https://appshunter.io/ios/app/route-your-pay/id6761783719)
- [Tip Arbiter](https://appshunter.io/ios/app/tip-arbiter/id6761786879)

All apps by Robert Corbin: https://appshunter.io/developer/1890247992

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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 2026-09-06.*