Sigma
The GPA calculator that actually understands how college works
Named after the Σ in the GPA formula—because we actually calculate it right. Credit-weighted GPA, per-class grading scales, and a generous free tier.
Features
Everything you need, nothing you don't.
Credit-Weighted GPA
The formula your transcript uses, finally in an app. Your 4-credit Calculus matters more than your 1-credit seminar.
Per-Class Grading Scales
Set A/A-/B+ or A/B/C for each course independently. No more one-size-fits-all.
What Do I Need?
Stop guessing what score you need on your final. Enter your target grade and see exactly what you need.
Home Screen Widgets
Check your GPA without opening the app. Small, medium, large, and lock screen widgets.
Privacy First
iCloud sync only through your personal Apple account. No tracking, no ads, no data collection.
6 Classes Free
A full semester for most students. No paywall tricks—we only ask you to pay when you need more.
Your Privacy Matters
Built by Bulpara with privacy at the core.
No Data Collection
Your grades are your business. We don't collect any data.
On-Device Processing
All calculations happen locally on your device.
No Tracking
Zero analytics, zero ads, zero third-party trackers.
iCloud Sync Only
Sync through your personal Apple account—not our servers.