Both track your subscriptions and warn you before renewals hit. They take genuinely different approaches to get there. Here's an honest, feature-by-feature look at where each one is actually stronger.
You use Gmail and don't want to connect your inbox to anything. You want dark pattern scores and post-cancellation charge alerts. You're a solo freelancer or small team focused on not getting blindsided.
You need document and contract storage alongside subscriptions. You want unused-seat detection, a health score, or a REST API to pull spend data into another dashboard. You're comfortable connecting Gmail or Outlook via OAuth.
Both products use a Free / Pro / Business structure, but the numbers and what's included at each tier are different.
Free and Pro are priced identically at $0 and $9/month. The gap opens at the team tier: BillSensor Business is $29/month for up to 10 seats, CostLoop Business is $39/month and doesn't publish a seat cap, it's built around shared workspaces and an approval workflow rather than a fixed number of members.
Both call themselves "genuinely useful, not a crippled trial." Here's what that means in practice.
| Free tier feature | BillSensor | CostLoop |
|---|---|---|
| Subscriptions detected | Unlimited | Up to 5 |
| Renewal reminders | Chrome notification | |
| Dark pattern / health score | 3 lowest-cost tools | Not included |
| Cancellation link storage | 3 lowest-cost tools | All 5 |
| Document / contract storage | Not offered | Included |
| Chrome extension email scan | No OAuth needed | Requires OAuth |
| CSV import / export | Not offered | Not included |
CostLoop's Free plan caps you at 5 subscriptions total, but everything within that cap is fully unlocked, cancellation links, notes, document storage. BillSensor's Free plan detects unlimited subscriptions, but only unlocks full alerts, scores, and cancel links for your 3 to 5 lowest-cost ones. Which trade-off is better depends on whether you'd rather see everything with limited depth, or fewer things with full depth.
| Capability | BillSensor | CostLoop |
|---|---|---|
| Detection | ||
| Gmail detection method | No OAuth, passive | OAuth connection |
| Outlook / Microsoft 365 | OAuth, read-only | OAuth connection |
| Bank statement CSV import | Not offered | Pro & Business |
| Risk & insight | ||
| Dark pattern / vendor-risk score | All plans | Not offered |
| Health score (0-100) | Not offered | Pro & Business |
| Unused seat / duplicate detection | Not offered | Pro & Business |
| Post-cancellation charge alerts | Pro & Business | Not offered |
| Price increase / anomaly alerts | Pro & Business | Not offered |
| Records & storage | ||
| Cancellation proof / record | Timestamped, Pro & Business | Not offered |
| Document / invoice / contract storage | Not offered | All plans |
| CSV export | Not offered | Pro & Business |
| Team features | ||
| Team seats | Up to 10 | Not seat-capped |
| Admin dashboard | Per-member detail | Per-member detail |
| Approval / request workflow | Not offered | Business |
| REST API & webhooks | Not offered | Business |
| Trust & compliance | ||
| Named legal entity disclosed | Pratyasha Fashion Galaxy OPC, India | Antevski ENK, Norway |
| Named compliance frameworks | Not published | GDPR, UK GDPR, and 6 more |
| Public subprocessor list | Not published | Published |
| Gmail OAuth verification status | N/A, no OAuth requested | Shows Google's "unverified app" warning |
Connecting Gmail through CostLoop's extension currently shows Google's "Google hasn't verified this app" warning screen, the same interstitial Google shows for any app requesting sensitive scopes before it has completed verification. This status can change if CostLoop completes Google's review process. BillSensor's Gmail detection has no equivalent screen to show, since it never requests OAuth access to begin with.
CostLoop is the fuller subscription-management system: ownership records, documents, an approval workflow, and integrations for teams that want to plug spend data into something else. BillSensor is narrower on purpose, it's a billing-alert and vendor-risk watchdog focused on the moment a charge is about to happen or already happened when it shouldn't have.
If your priority is not connecting your Gmail account to anything and knowing which of your tools behave badly at cancellation time, BillSensor is built specifically for that. If your priority is a complete operational system for tracking who owns what, storing contracts, and reporting spend to a wider team, CostLoop covers more of that ground today.
BillSensor's free tier detects unlimited subscriptions with no OAuth for Gmail. Try it and decide for yourself.
Add BillSensor to Chrome, free →Yes, CostLoop's email scanner requires an OAuth connection to Gmail or Outlook. BillSensor's Gmail detection needs no OAuth connection at all.
It depends on what the agency needs most. CostLoop's Business plan includes an approval workflow and document storage useful for managing client tool purchases. BillSensor's Business plan focuses on catching billing risk, dark pattern scores and post-cancellation alerts, across up to 10 team members.
Yes. Since BillSensor detects subscriptions automatically from your Gmail or Outlook inbox, you don't need to manually re-enter anything you were tracking in CostLoop, just install and it starts detecting on its own.