Features
A–F trust grade per review
Every Amazon review gets a letter grade on the page itself. Green for trustworthy, amber for suspect, red for almost-certainly fake. No clicking through. No waiting.
7-signal heuristic detector
Text patterns, reviewer history, timing clusters, language fingerprint, photo reuse, verified-purchase status, helpfulness ratio. Each signal feeds the grade so it's never one-shot fragile.
On-device Gemini Nano
The AI lives on your laptop. Reviews are fed to Chrome's built-in Prompt API and graded locally. Your reading habits never leave your browser — there's no server to leak them.
Deep Analyze — free and unlimited
Run Deep Analyze on as many reviews as you like, at no cost. It breaks down exactly which signals triggered a fake-review flag — no daily quota, no unlock, no premium tier.
Adjusted Rating
See what the product's star rating would be if the suspected fakes were stripped out. The headline number Amazon shows you isn't always the one you should buy from.
Per-review flagging
Click any review on Amazon and Review Guardian explains its grade in plain English. No reading between the lines. No vague "this might be sponsored" disclaimers.
Badge legend on every product page
A small inline legend tells you what A through F actually mean, what the heuristic looks for, and which signals were strongest on this listing. No mystery scoring.
Amazon-only — fully supported
One platform, one DOM. We'd rather ship a working Amazon experience than a half-broken multi-marketplace one. Walmart and eBay are on the roadmap.
Why Review Guardian?
Fakespot shut down on 1 July 2025. Mozilla acknowledged the impact on the user base it was leaving behind in its 2025-05-22 announcement: server-side LLM inference at consumer scale wasn't a model they could sustain. Millions of shoppers who relied on Fakespot were left without a working replacement.
Review Guardian is built from the ground up for on-device AI. Chrome 138 ships Gemini Nano, the same kind of large language model Fakespot used — except it runs in your browser, not in someone else's data centre. There are no per-user inference costs to break. The tool stays free indefinitely because the economics that killed Fakespot don't apply here.
It's actively maintained, Amazon-focused on purpose (one DOM, fully supported), and graded under a 7-signal heuristic that's harder to game than any single ML model. Chrome 138 or newer required. Your laptop does the AI work — that's the trade for $0 server costs and zero data leaving your browser.
Free, forever
- The AI runs on your device, so serving you costs us nothing — the economics that killed Fakespot don't apply here
- A–F trust grades, unlimited Deep Analyze, Adjusted Rating, per-review flagging — all unlocked for everyone
Privacy First
- No servers. The AI runs in your browser, not ours.
- No tracking. We don't see what you analyze, ever.
- No account. Install and go.
- No data collection. Reviews stay on Amazon's page; trust scores stay on yours.
- Minimal permissions. Amazon domains only. No "all websites" creep.
Frequently asked questions
Is Review Guardian a Fakespot replacement?
Yes. Mozilla shut Fakespot down on 1 July 2025 because server-side LLM inference at consumer scale was uneconomic. Review Guardian solves the same problem — grading the trustworthiness of Amazon reviews — using on-device AI that runs in your browser instead of on someone else's server. There are no per-user inference costs to break, so the tool stays free.
How does Review Guardian grade reviews without sending data anywhere?
Chrome 138 ships an on-device large language model called Gemini Nano, accessible to extensions through the Prompt API. Review Guardian feeds each review through Gemini Nano locally — the model lives on your laptop, the inference happens in your browser, the review text never leaves the page. We pair that with a 7-signal heuristic detector (text patterns, reviewer history, timing, language) to produce an A–F trust grade.
Why is it Amazon-only?
One platform, one DOM. We'd rather ship a working Amazon experience than a half-broken multi-marketplace one. Walmart, Best Buy and eBay are on the roadmap once the Amazon detector is rock-solid.
What does Deep Analyze do?
Every visit to an Amazon product page gets the full A–F grade automatically. Deep Analyze is a heavier per-review breakdown — it explains exactly which signals triggered a fake-review flag. It's free and unlimited for everyone: no daily quota, no unlock, no premium tier.
How much does Review Guardian cost?
Nothing — Review Guardian is completely free. Every feature is unlocked for everyone: the A–F grade on every Amazon review, unlimited Deep Analyze, Adjusted Rating, and per-review flagging. No account, no paywall, no subscription.
Does Review Guardian track me or send data to your servers?
No. There are no servers — the AI runs in your browser, not ours. No tracking, no telemetry, no account required. Reviews stay on Amazon's page; trust scores stay on yours. The extension only has permission for Amazon domains; we don't request access to other websites.
What browsers does Review Guardian support?
Chrome 138 or newer. The on-device AI requires Chrome's Prompt API, which shipped in Chrome 138. Brave, Edge, Opera and Vivaldi will work once their Chromium base reaches 138 with the Prompt API enabled. Firefox doesn't have an equivalent in 2026 — that's a platform limitation, not a feature we declined to ship.
See it on a real Amazon page
