Growth · alternatives · 2026

24 alternatives to Sentinel

A chrome addon that scan your emails for any phishing attack

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1
Email Hunter for Chrome▲370
Find all the emails related to a domain with just one click
2015 · hunter.io · its alternatives →
2
Creep Alert▲131
Check if friends or colleagues track you via email
2019 · its alternatives →
3
WebSafely Extension▲113
Instantly know if a site is a scam, right from your browser
2025 · chromewebstore.google.com · its alternatives →
4
Scary Senders▲123
Detect spooky spy pixels in your emails
2021 · encouragement.beyondco.de · its alternatives →
5
Reply: Email Search▲399
Free email search on LinkedIn
2020 · reply.io · its alternatives →
6
Phishing Alert▲8
Monitor, detect and learn about Phishing techniques
2017 · its alternatives →
7
Password Checkup by Google▲178
A Chrome Extension to help resecure hacked accounts
2019 · chromewebstore.google.com · its alternatives →
8
Suspicious Site Reporter▲74
Report suspicious sites to Google
2019 · chromewebstore.google.com · its alternatives →
9
B.S. Detector▲227
Identify fake news sources on Facebook in Chrome
2016 · chromewebstore.google.com · its alternatives →
10
MimicAI▲9
AI phishing defence for Gmail, without blocking your emails
2024 · its alternatives →
11
Web3 Antivirus Extension 2.0▲140
Bring confidence and security to your Web3 transactions
2024 · web3antivirus.io · its alternatives →
12
Email Open Tracker for GMAIL▲126
Keep an eye on your email opens
2024 · its alternatives →
13
MailSnitch▲156
Tag your emails to see who’s selling it
2025 · chromewebstore.google.com · its alternatives →
14
SafeToOpen▲81
Anti-phishing extension that alerts you of dangerous sites
2021 · chromewebstore.google.com · its alternatives →
15
Apozy for Chrome▲48
Chrome extension that blocks phishing
2017 · apozy.com · its alternatives →
16
Extension Police▲115
Police your chrome extensions
2018 · chromewebstore.google.com · its alternatives →
17
Uppward Chrome Extension▲109
Protect yourself from crypto scams and frauds
2018 · uppward.sentinelprotocol.io · its alternatives →
18
MetaShield▲102
A chrome extension to keep your ETH & NFTs safe from scams
2021 · chromewebstore.google.com · its alternatives →
19
SELLsecure Scams investigator▲78
Check who is behind an email and detect fraud
2017 · its alternatives →
20
Spam Checker by Mailmeteor▲88
Detect and remove spam words in your emails
2022 · mailmeteor.com · its alternatives →
21
A Chrome extension to see notifications for comments on your HN threads▲79
2021 · chrome.google.com · its alternatives →
22
Link Shield▲14
Detect phishing, malware, and suspicious links with an AI-powered URL scanning API.
2025 · linkshieldapi.com · its alternatives →
23
EGUARD▲3
After seeing sophisticated phishing attempts slip through Gmail's filters, a friend and I built a browser extension that uses local AI to analyse emails for threats. It runs entirely in your browser using web-llm, with any threat being clearly labelled with an explanation of why it's suspicious. Still early days, but we'd love feedback from the HN community. Even if you're not comfortable installing it yet, we have screenshots showing how it works. https://www.eguard.app https://chromewebstore.google.com/detail/eguard/dnpofinmilhb...
2025 · chromewebstore.google.com · its alternatives →
24
A browser extension that notifies you about new messages using LEDs▲17
Browser extension that signals urgent tabs through a laptop's LEDs - snoack/chrome-blinklight
2017 · github.com · its alternatives →

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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →