FlowSense vs Radio Silence
Radio Silence is a good fit when you want a short list of apps that must stay offline. FlowSense is for seeing the services inside their traffic and choosing what to block or slow.
Facts checked on 3 November 2026.
When Radio Silence Is Enough
Radio Silence costs $9 and runs on Apple silicon and Intel Macs with macOS 10.15 or later. You choose apps to block, without connection pop-ups. Its monitor shows live connections, including helpers and background processes. The vendor says child processes of blocked apps are blocked too.
Its FAQ offers a 24-hour full trial and says a personal licence covers all your computers. If your goal is simply to keep a few apps offline, that may be all you need.
What Changes With FlowSense?
FlowSense separates an app's traffic into named services, then hostnames and individual connections. That helps when you want to keep an app online but control one service inside it. Classification reads handshakes without decrypting content. How FlowSense names services.
| You Want | Radio Silence | FlowSense |
|---|---|---|
| Block Whole Apps | A list of blocked apps | Not supported by executable; rules target services and destinations |
| See Connections | A live network monitor | Live tree with service names, free |
| Slow Traffic | Not listed on its site | Per classified service or hostname in Full |
| Price | $9 | Free to watch; $29 once until 9 November 2026, then $49 for Full |
Full also adds schedules and expiry, block lists fetched daily, and Warden. Warden's Ask mode brings you a suggested action; Auto acts on its own and is a Research Preview. Over MCP, your AI apps can inspect traffic. Connections start read-only; enable Allow Changes to let them manage rules. See the features.
FlowSense currently cannot block a Mac executable or process as a whole. A rule for a service applies wherever that service is identified, and unclassified traffic needs another supported target. Choose Radio Silence if your requirement is to keep an entire installed app offline.
Radio Silence vs Little Snitch
Little Snitch is the other common option in this search. It can prompt before a new connection sends data and supports rules scoped to servers, domains, ports or protocols. Radio Silence's approach is a list of apps you have already decided to block. Choose based on how often you want to make decisions and how much detail you need. Compare Little Snitch with FlowSense.
Before You Try FlowSense
FlowSense needs an Apple silicon Mac running macOS 14 or later and an account, even for Free. It has no Windows or Linux app and isn't sold in the EU, the UK, Iceland, Liechtenstein or Norway yet. Full is for one Mac, with a 7-day trial and a 30-day refund window. See pricing.
Start by watching the apps you care about. Only add blocking rules once you understand their traffic, and test that their sign-in, updates and sync still work. Remove a rule if it stops something you need.
Sources
- Radio Silence: network monitor and firewall
- Radio Silence: trial, licences and compatibility
- Little Snitch: connection alerts and network monitor
Radio Silence and Little Snitch are trademarks of their respective owners. FlowSense is not affiliated with their developers.