Twin Calculator vs ShiftInbox
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Twin Calculator
Perform two calculations simultaneously with this multi-function calculator. It allows for formula display and registration of constants, making complex calculations and tax calculations easier.
- Two calculators for simultaneous calculations
- Formula display for clear input
- Constant registration for quick access
- Supports bracket expressions
- Easy tax calculation
Read full descriptionHide full description
■ Overview · This app can do two calculations at the same time. - At the same time you can display two calculators. · You can register the display and constant formula, they are useful calculator. ■ function 1. Two calculator To perform multiple calculations simultaneously in that there are two calculator, it can be conveniently used in various situations. 2. formula display You can batch calculation from entering the formula. It is easy to understand and difficult to mistake the formula display type computer. It corresponds to the expression using the brackets. 3. constant registration Two constants registration is possible. You can easily calculate the tax amount at the time of shopping.
ShiftInbox
Read full descriptionHide full description
Turn a photo of your work schedule into an Apple Calendar you can trust. ShiftInbox reads roster screenshots on your device, then lets you review every shift before anything is synced. IMPORT THE SCHEDULE YOU ALREADY HAVE • Scan one screenshot or a batch of images • Import PDF, copied text, shared files, and ICS calendars • Use on-device OCR—no schedule is sent to an external AI service SEE WHAT CHANGED Compare each new roster with the last import. Added shifts, changed times, and cancellations are clearly marked. Review uncertain OCR results and catch overlapping shifts before they reach your calendar. SYNC WITH CONTROL Apply only approved changes to Apple Calendar. ShiftInbox tracks each shift with a private identifier so future updates, cancellations, undo, and rollback affect the correct event. BUILT FOR REAL SHIFT WORK Manage multiple employers, route each workplace to its own calendar, add reminders and reusable shift templates, check commute and working-hour risks, estimate earnings, and export schedule reports. Try two successful imports free. A one-time Lifetime Pro purchase unlocks unlimited imports, complete history and rollback, batch editing, screenshot detection, JSON backup, CSV export, iCloud sync, widgets, the share extension, and every advanced scheduling tool. No subscription. No account required. Your data stays on your device, or in your private iCloud account when you enable Pro sync. Terms of Use: https://shiftinbox.codemxm.com/terms/
Screenshots
Verdict
The clearest difference is iOS requirement: Twin Calculator at 8.0 against ShiftInbox's 17.0. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Twin Calculator | ShiftInbox |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 4 months | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 8.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 4 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | R.E.O. Factory | 德明 杨 |
In-app purchases
Twin Calculator
No in-app purchases
ShiftInbox
No in-app purchases
Questions
Is Twin Calculator free?
Is ShiftInbox free?
Do Twin Calculator or ShiftInbox have ads?
Other comparisons















