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."
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.
Get notified before every charge — browser notification and email. Never get surprised again.
We score each tool's billing practices 1–10. High scorers get flagged automatically.
Generate timestamped proof of cancellation. Dispute unauthorized charges with evidence.
See every charge, every month. Track your total SaaS spend and spot anomalies.
Automatically finds subscriptions from 62+ SaaS tools. Works with Gmail (passive, no connection) and Outlook / Microsoft 365 (connected scan, 12-month history). No manual entry needed.
No Gmail connection required. No OAuth. Email content is read locally and never leaves your device. No data sold. Ever.
BillSensor works differently depending on your email provider. Both modes detect the same 62+ 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 62 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 | Coming Soon | ✗ | ✗ |
| Cancellation records (PDF) | ✓ | ✗ | ✗ |
| Outlook / Microsoft 365 support | ✓ | ✗ | ✗ |
| Bank account connection required | No | No | Yes |
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.
Post-cancellation monitoring is coming in Phase 2. You'll be able to mark a subscription as cancelled, and if a billing email from that tool arrives after your cancellation date, BillSensor fires an immediate alert. This directly targets tools like Mailchimp and Zapier that continue charging after cancellation.
Yes. All four are on BillSensor's 62-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.
14-day money-back guarantee. Cancel anytime.
14-day money-back guarantee. Cancel anytime.