Quick Sigma
Hiroshi Sakakibara Productivity iPhoneiPadiPod touch
Quick Sigma is a free Productivity app for iPhone and iPad by Hiroshi Sakakibara. Requires iOS 18.6. Updated October 13, 2026.
- Price
- Free
- on the App Store
- Size
- 6 MB
- Age 4+
- Updated
- Oct 13
- 2026 · v2.1
Screenshots
About Quick Sigma
Enter numbers the way you would on a calculator, and get totals by category, by item, and by day. Quick Sigma is made for anyone who adds up the same kinds of numbers on a calculator, day after day. Whenever you want to see where things stand, tap the ∑ (Totals) key. Subtotals and the grand total are right there. Every entry is saved on its own, so one mistake never means starting over. Just fix that one entry. ■ Made for - Shop owners who total daily sales by department on a calculator - Anyone tracking household spending by category - Anyone who adds up more than money, like miles or inventory ■ How it works Set up three levels once, at the start: Tab (what you're totaling) → Group (category) → Item (breakdown) Example: Household → Food → Vegetables The groups and items you set up become keys on your calculator. From then on, just tap Group → Item → number. Items are optional: for a group without items, you type the number right after choosing the group. Within each tab, entries are recorded by date, so you can keep using the same keys day after day. Choose a tab, and the date is filled in for you. ■ Totals, your way - Switch views: by group, by item, or by date - See sales entered by department, regrouped by product - Total a period (this week, this month, last month, and more) or any dates you pick - See how many entries make up each total ■ Example: splitting the bill You paid for dinner with friends. Are you now going down the receipt again for each person? With Quick Sigma, enter the receipt just once, from top to bottom. Tap ∑, and each person's total is ready. ■ Your data stays on your device Quick Sigma collects no personal information and no usage data. Nothing you enter is ever sent anywhere. No ads, no tracking. ■ Free - 1 tab with up to 5 groups, and up to 5 items in each group - No limit on how many entries or days you record - Viewing past data, totals, and backup are always free and unlimited ■ Full Plan (subscription) - Unlimited tabs, groups, and items - Reorder tabs, groups, and items freely - Custom digit limits (how many integer and decimal places an entry can have) - Saving 0 as an entry - CSV export (opens in spreadsheet apps) □ About the subscription - Monthly and yearly plans are available (prices are shown on the in-app purchase screen) - Payment is charged to your Apple Account. The subscription renews automatically unless canceled at least 24 hours before the end of the current period - You can cancel anytime in Settings > [your name] > Subscriptions on your iPhone - Canceling never deletes your data. Viewing, totals, and backup remain available, and you can keep adding entries to the tab, groups, and items marked Main Privacy Policy: https://orucad4.github.io/sigmas-support/privacy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Contact: [email protected]
What’s new
Version 2.1 · Updated October 13, 2026
- Add groups and items right in the list. Type a name, tap Return, and keep going. - Rename or delete tabs, groups, and items you haven't used yet. Look for the pencil icon. You'll confirm them when you move on to entering numbers. This includes unused ones you made before this update. - Backups are now checked before you share them, and you'll see how many entries each one includes. - Better VoiceOver: labels that were read in Japanese are now in English, and days and dates are easier to follow. - Expanded Help. - Fixed: tapping the item field for a group with no items could open a blank screen and clear the number you were typing. - Other fixes and improvements.
App privacy
The developer, Hiroshi Sakakibara, reported these privacy practices to Apple.
Data Not Collected
The developer does not collect any data from this app.
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| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| Quick Sigma | – | Free | October 13, 2026 | |
| Register Check: Cash Count | – | Free | Oct 11, 2026 | Compare |
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| SimpleSigma | – | Free | Aug 6, 2026 | Compare |
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