moss vs LeechBlock NG
A free browser extension that blocks time-wasting sites by schedule or time allowance.
Checked 11 November 2026 against James N. Anderson's own pages. We make moss, so we have linked every source below.
What LeechBlock NG is
LeechBlock NG is a free extension for Firefox, Chrome, Edge and other Chromium browsers such as Brave, Opera and Vivaldi. You define up to 30 sets of sites, each with its own times and days, and block them in fixed periods, after a time allowance, or both. A Lockdown option blocks straight away for a duration you choose. The options page can be protected with a password or a random access code. It works inside the browser only.
What moss is
moss is an iPhone app that comes with a small physical stone. You choose the apps that distract you, tap your phone on the stone, and those apps stay locked until you tap the stone again. People who live together can link their phones to share schedules and put their phones down at the same time, while each person keeps control of their own phone. Locking is free in the app, the stone is a one-time purchase, and the household features are a paid add-on.
Side by side
| Feature | moss | LeechBlock NG |
|---|---|---|
| Price | US$49 stone, free app | Free |
| Subscription | None to lock your own phone. Household features are a paid add-on | None |
| Works on | iPhone only, iOS 17 or later | Firefox, Chrome, Edge and other Chromium browsers |
| How you lock | Tap the stone, or start from the app, a Shortcut, the lock screen or the Action Button. Schedules by day of week | Up to 30 site sets with their own times and days. Lockdown for an immediate block |
| How you unlock | Tap the stone, in the app | Wait, or change the options |
| If you need back in | 3 emergency unlocks a month, refilled automatically | None beyond the access code |
| Locking together as a household | Yes, as a paid add-on. Shared schedules, sessions others join in one tap, a view of whose phone is down, a streak. Nobody controls anyone else | None |
| Whose key opens your phone | Only your household's own stone, card and sprigs unlock your phones | No key. Options can sit behind a password or access code |
Where LeechBlock NG is better
- It is free.
- It covers desktop browsers, which moss does not.
- Very detailed schedules for each set of sites.
Where moss is better
- It locks apps on your iPhone, which a browser extension cannot reach.
- The unlock is a stone in another room, not a code you type.
- Households can lock together and see whose phone is down.
Who should pick which
Pick LeechBlock NG if
Your problem is websites in a desktop browser and you want a free fix.
Pick moss if
Your problem is the apps on your phone. The two cover different devices.
Sources
Spotted something out of date? Tell us and we will fix it.
moss is a stone that locks the apps you choose.
Tap to lock, tap to unlock. One price, and locking needs no subscription.
