BillSensor detects SaaS billing emails and alerts you 7 days before any charge. Gmail users get passive detection with no account connection needed. Outlook and Microsoft 365 users connect once via the extension popup and get a full 12-month billing history scan.
"I was charged $498 after cancelling my Mailchimp account. They kept billing me for 4 months and I had no idea."
"Zapier charged me $49 three months after I cancelled. Their system never processed the cancellation properly."
"Notion silently added billing seats when I invited my team. I didn't notice until my card was charged $240 extra."
A bank statement shows the charge once it's already left your account. By then your only options are a refund request or a dispute.
You set one for the first renewal, then forget to reset it for the next. Annual subscriptions are the easiest to lose track of entirely.
Adobe, Mailchimp, and Zapier have all charged customers after a confirmed cancellation. Nothing tells you if it happens to you too.
The fifth subscription gets added. The tenth doesn't. Six months later it's out of date and nobody trusts it enough to check.
Add BillSensor to Chrome in one click. No credit card. No personal data required to get started.
Gmail users: BillSensor reads billing emails passively as you browse — no account connection, no OAuth. Outlook and Microsoft 365 users: connect once via the extension popup and BillSensor scans 12 months of billing history instantly.
Receive browser notifications and email alerts 7 days before any SaaS renewal. Cancel before you're charged.
Every subscription, alert, and cancellation link, visible in seconds. Shown here with sample data.
From the extension popup to your dashboard, here's every screen you'll actually use.
Get notified before every charge via Chrome notification and email. Never get surprised by a renewal again.
Mark a subscription as cancelled. Get warned 7 days before the expected charge date, and get an immediate alert if a billing email arrives after cancellation.
Detects when a tool charges more than last time and fires a "Price increased" alert. Any charge 20%+ higher than the last known amount is flagged as a suspicious spike.
We score each tool's billing practices 1–10. High scorers get flagged automatically with a direct cancel link.
Generate timestamped proof of cancellation as HTML or PDF. Dispute unauthorized charges with evidence.
Full history of every detected subscription and charge. Track your total SaaS spend month by month.
Finds subscriptions from 61+ SaaS tools. Gmail passive detection (no connection), Outlook daily auto re-scan (Pro), and multiple Gmail accounts supported.
No Gmail connection required. No OAuth. Email content is read locally and never leaves your device. No data sold. Ever.
What we actually store: for logged-in Pro and Business accounts, only parsed subscription details, tool name, amount, renewal date, and cancellation status, sync to our servers so we can send email alerts and keep your data available across devices. Raw email content is never stored or transmitted. Free users with no account keep everything local to their browser.
BillSensor works differently depending on your email provider. Both modes detect the same 61+ tools. Both alert you before charges. The difference is how detection happens.
BillSensor reads billing emails as you naturally open them in Gmail. No Google account connection, no OAuth permission, no API access. Install the extension and it works immediately — nothing to set up.
Connect your Outlook or Microsoft 365 account once via the extension popup. BillSensor scans 12 months of your billing history instantly and surfaces every subscription — including ones you've long forgotten about.
Every feature below targets a real billing abuse pattern. No fluff.
Further out: Yahoo Mail, bank/card connection via Plaid, and Zapier integration are planned for Phase 3.
BillSensor scores each SaaS tool's billing practices from 1 to 10 based on verified complaints, cancellation flow audits, and Trustpilot data. The higher the score, the more aggressive their tactics.
Charges an early cancellation fee of up to 50% of remaining contract value. Cancellation flow is buried and requires a phone call in some regions. Over 7,200 Trustpilot reviews, 1.2★ average.
Continues billing after account cancellation attempts. Users report charges for 3-4 months post-cancellation with no confirmation emails. Refund process is manual and inconsistent.
Silently adds billing seats when team members are invited. Annual plan renewals arrive with minimal notice. Users frequently report surprise charges on annual renewal dates.
See all 61 tools rated. View the full dark pattern scorecard →
Every other subscription tracker requires you to connect your Gmail account via OAuth. That means granting an app permission to read your inbox. BillSensor doesn't ask for that.
| Feature | BillSensor | SaaS Subscription Tracker | CostLoop |
|---|---|---|---|
| Gmail OAuth required | No | Yes | Yes |
| Dark pattern scores | ✓ | ✗ | ✗ |
| Direct cancel links | ✓ | ✓ | ✓ |
| Post-cancellation monitoring | ✓ (Pro) | ✗ | ✗ |
| Cancellation records (PDF) | ✓ | ✗ | ✗ |
| Outlook / Microsoft 365 support | ✓ no OAuth | ✗ | ✓ via OAuth |
| Bank account connection required | No | No | No optional CSV upload only |
CostLoop offers a strong subscription-management feature set, including cancel links and Outlook support. BillSensor's core difference is architectural: Gmail detection needs no OAuth connection at all, nothing to grant, nothing to revoke.
No, not for Gmail. BillSensor uses passive detection for Gmail — it reads billing emails as you naturally open them in your inbox, with no Gmail account connection, no OAuth permission, and no API access. Your email content never leaves your browser. If you use Outlook or Microsoft 365, you connect once via the extension popup, but that connection is read-only.
Yes. Outlook and Microsoft 365 are fully supported. Open the BillSensor extension popup, connect your account, and BillSensor scans 12 months of billing history instantly — surfacing every subscription, including ones you've forgotten about. The connection is read-only. BillSensor cannot send, delete, or modify any emails.
BillSensor rates each SaaS tool's billing behaviour from 1 to 10 based on how aggressively they use dark patterns — things like hidden cancellation flows, forced continuity, surprise seat additions, and post-cancellation charges. A score of 8 or above means the tool has a documented history of billing abuse.
No. BillSensor never connects to your bank account or payment cards. It detects subscriptions from billing emails only — no financial account access required.
Yes, on Pro and Business plans. Mark a subscription as cancelled and BillSensor watches two ways: a heads-up email 7 days before the original expected renewal so you can verify the cancellation went through, and an immediate alert if a new billing email shows up from that tool after your cancellation date. This directly targets tools like Mailchimp and Zapier that continue charging after cancellation.
Yes. All four are on BillSensor's 61-tool detection list and have dark pattern scores based on verified billing complaints. Adobe scores 9/10, Mailchimp 8/10.
Yes. When BillSensor detects a trial confirmation email, it sets a 7-day alert before the trial end date. You get a Chrome notification before the first charge hits — giving you time to cancel if you don't want to continue.
Track every tool you pay for without opening a spreadsheet. Know what's costing you before the invoice does.
Managing subscriptions across multiple clients gets messy fast. Catch billing surprises before they eat into a project's margin.
Built for a 1-to-10 person team juggling more SaaS tools than anyone realizes, without needing a full subscription-management platform.
Get a full 12-month billing history the moment you connect. No other tracker builds specifically for Microsoft 365 the way BillSensor does.
Not built for enterprise procurement workflows, SSO-based discovery across 200+ person orgs, or bank and card expense management. Those need a bigger platform than this.
Excellent tool for tracking SaaS subscriptions! BillSensor makes it much easier to keep track of recurring SaaS payments and renewal dates. I like that it detects billing emails and provides timely reminders before charges occur, helping avoid unexpected renewals. The privacy-first approach, local email detection, and direct cancellation links are thoughtful features. A great extension for freelancers, agencies, and anyone managing multiple SaaS subscriptions.
BillSensor is an incredibly useful extension for anyone who manages multiple SaaS subscriptions. It makes it easy to keep track of upcoming renewals, helps prevent unexpected charges, and provides a clear overview of recurring expenses. The interface is clean, the reminders are timely, and the cancellation links are a great addition.
I have been using BillSensor for the last 3 days, and it's been a great experience so far. It detected all of my active subscriptions and notified me about upcoming renewals without me having to do much. Everything works locally in the browser, which gives me more confidence about privacy. I'm planning to upgrade to the Pro plan.
BillSensor is a fantastic Chrome extension for keeping track of SaaS subscriptions. It was quick to set up, easy to use, and the renewal reminders have already helped me avoid unexpected charges. The cancellation links and billing insights are really useful.
Excellent extension! Simple to set up, easy to use, and very helpful for tracking SaaS subscriptions and recurring bills. Highly recommended!
Excellent extension.
14-day money-back guarantee. Cancel anytime in 1 click.
14-day money-back guarantee. Cancel anytime in 1 click.
Last updated August 2026
Connect Outlook or Microsoft 365 for a full 12-month inbox scan via Microsoft Graph API. Pro and Business get automatic daily re-scanning in the background.
Mark a subscription cancelled and BillSensor watches two ways: a heads-up email 7 days before the original renewal date, and an immediate alert if a billing email shows up anyway.
Get notified the moment a tool raises its price, or if a charge lands 20%+ higher than what you paid last time.
One admin, up to 9 members, each connecting their own Gmail or Outlook independently. The admin dashboard shows every member's subscriptions, spend, and upcoming renewals in one place.
A dedicated web dashboard alongside the extension: monthly spend, renewals this month, full subscription history, manual add, and CSV import for bulk-adding existing subscriptions.
Download a timestamped record proving when you cancelled a subscription, useful evidence if a company charges you after the fact.
Free users get email renewal alerts on their 5 lowest-cost subscriptions, with cancel links and dark pattern scores unlocked for the 3 cheapest of those.
On top of the standard 7-day warning, a second alert fires 3 days before a charge hits, a final chance to cancel or block the payment.
Recognizes and displays amounts in USD, EUR, GBP, INR, and other major currencies with the correct symbol.
Confirmed compatibility with Edge, Brave, Opera, and other Chromium-based browsers, not just Chrome.