1
BlockBlock
objective-see.org/products/blockblock.htmlAlso covers macos and privacy · same kind of website
BlockBlock monitors for malware that installs itself persistently to run automatically after a restart or login.
Alternatives
The Best KnockKnock Alternatives in 2026
24 alternatives1 free · 1 open source
Looking for something like KnockKnock? Here are 24 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 1 are free or have a free plan and 1 are open source.
About KnockKnockobjective-see.org/products/knockknock.html
VisitCheck which software is persistently installed on a Mac with KnockKnock, a tool for inspecting startup items.
Top picks at a glance
First suggestionBlockBlockBlockBlock monitors for malware that installs itself…Free or freemium optionStayStay for Safari lists userscripts and ad blocking among its…Open source optionYubikey Full Disk EncryptionUse a YubiKey challenge-response at system startup to open…Another optionWhat's Your Sign?Check file origin and cryptographic signing details from…
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | BlockBlock | — | Not stated | macOS, Web |
| 2 | What's Your Sign? | — | Not stated | macOS, Web |
| 3 | Collision | — | Not stated | Linux, Web |
| 4 | Yubikey Full Disk Encryption | — | Yes | Linux |
| 5 | Tunnelblick | — | Not stated | macOS, Web |
| 6 | MailTrackerBlocker | — | Not stated | macOS, Web |
| 7 | OverSight | — | Not stated | macOS, Web |
| 8 | LuLu | — | Not stated | macOS, Web |
| 9 | DHS | — | Not stated | macOS, Web |
| 10 | SuspiciousPackage | — | Not stated | macOS, Web |
All KnockKnock alternatives
2
What's Your Sign?
objective-see.org/products/whatsyoursign.htmlAlso covers macos and privacy · same kind of website
Check file origin and cryptographic signing details from Finder with this macOS utility.
3
Collision
flathub.org/apps/dev.geopjr.CollisionAlso covers privacy · same kind of website
Collision checks file hashes on Linux, with installation available through Flathub.
4
Also covers privacy · open source
Use a YubiKey challenge-response at system startup to open a LUKS-encrypted disk volume.
5
Tunnelblick
tunnelblick.netAlso covers macos and privacy · same kind of website
Tunnelblick is free, open-source macOS software for controlling OpenVPN connections, with downloads and support information on its site.
6
MailTrackerBlocker
apparition47.github.io/MailTrackerBlockerAlso covers macos and privacy · same kind of website
The MailTrackerBlocker extension for macOS Apple Mail blocks email trackers, read receipts, and tracking pixels.
7
OverSight
objective-see.org/products/oversight.htmlAlso covers macos and privacy · same kind of website
Get alerts when an app accesses a Mac microphone or camera with OverSight.
8
LuLu
objective-see.org/products/lulu.htmlAlso covers macos and privacy · same kind of website
Monitor and control outgoing network connections on macOS with LuLu, a free, open-source firewall.
9
DHS
objective-see.org/products/dhs.htmlAlso covers macos and privacy · same kind of website
Dylib Hijack Scanner is a utility that scans a computer for applications that may be vulnerable to dylib hijacking.
10
SuspiciousPackage
mothersruin.com/software/SuspiciousPackage/get…Also covers macos and privacy · same kind of website
Suspicious Package provides a downloadable macOS disk image, with its page listing the current version and bundle identifier.
11
RansomWhere?
objective-see.org/products/ransomwhere.htmlAlso covers macos and privacy · same kind of website
Detect possible macOS ransomware by monitoring file encryption activity with RansomWhere?.
12
Hyphanet
hyphanet.orgAlso covers macos and privacy · same kind of website
Hyphanet provides information and downloads for a project focused on protecting internet privacy.
13
Kextviewr
objective-see.org/products/kextviewr.htmlAlso covers macos and privacy · same kind of website
View details about kernel modules loaded on macOS with KextViewr, a utility from Objective-See.
14
Also covers privacy · same kind of website · free plan
Stay for Safari lists userscripts and ad blocking among its features, with ratings and reviews available on the App Store.
15
Freenet
freenet.orgAlso covers privacy · same kind of website
Freenet offers peer-to-peer apps that operate without company control or dedicated servers, according to the project site.
16
AdGuard Mini
adguard.com/en/adguard-safari/overview.htmlAlso covers privacy · same kind of website
AdGuard Mini blocks ads in Safari on Mac and is described as helping protect privacy and reduce page loading times.
17
OnionHop
onionhop.deAlso covers privacy · same kind of website
OnionHop routes desktop traffic through Tor, with proxy and system-wide VPN modes, bridges, split tunneling, and a kill switch.
18
Lockdown Privacy
lockdownprivacy.comAlso covers macos and privacy · same kind of website
Lockdown Privacy offers an open-source firewall for blocking trackers, ads, and badware in apps on iPhone and iPad.
19
LinkLiar
halo.github.io/LinkLiarAlso covers macos and privacy · same kind of website
LinkLiar helps spoof a Mac Wi-Fi MAC address through a Swift status menu app documented in its handbook.
20
OPNsense
opnsense.orgAlso covers privacy · same kind of website
OPNsense provides open-source firewall and routing software, with project documentation and support information on its site.
21
Linux Hardening
madaidans-insecurities.github.io/guides/linux-…Also covers privacy · same kind of website
Follow this Linux hardening guide for steps to improve the security of a Linux system.
22
Tor Browser
torproject.orgAlso covers privacy · same kind of website
The Tor Project promotes online anonymity and tools to defend against tracking, surveillance, and censorship.
23
ShuffleStacks
shufflecake.netAlso covers privacy · same kind of website
Shufflecake is a Linux tool for creating multiple hidden filesystems with plausible deniability.
24
Securely Wipe Disk
wiki.archlinux.org/title/Securely_wipe_diskAlso covers privacy · same kind of website
The ArchWiki guide covers securely wiping a disk, with related security articles and Arch Linux resources on the wiki.
No alternatives match this filter.
Alternatives to similar tools
Stay24 alternativesLinux Hardening24 alternativesYubikey Full Disk Encryption24 alternativesCollision24 alternativesMailTrackerBlocker24 alternativesLockdown Privacy24 alternatives
What is the best alternative to KnockKnock?
Based on features, tags and platforms, the closest alternatives to KnockKnock are BlockBlock, What's Your Sign?, and Collision.
Is there a free alternative to KnockKnock?
Yes. Stay is free or offer a free plan.
Are there open-source alternatives to KnockKnock?
Yes: Yubikey Full Disk Encryption.
Alternatives are suggested from the purpose and features described in our listings. Different pages for the same product appear once. Read each description to check whether it fits your task. How we choose alternatives · Suggest an alternative