prismCalc is an everyday calculator for the math that tends to happen outside a spreadsheet: splitting a dinner bill, checking a discount, comparing loan payments, converting units, or reusing a result from earlier in the day. It runs on iPhone, iPad, Mac, and Apple Watch, with a consistent glass-style interface and no tracking.
**LIVE CALCULATION PREVIEW**
• See the running result while you build an expression
• Keep enough context on screen to catch mistakes before pressing equals
**KEEP RECENT RESULTS CLOSE**
• Dynamic Island can keep your last calculation visible while you switch apps
• Widgets and quick actions help you get back to recent math without digging through the app
• History lets you reuse prior calculator, tip, discount, loan, and conversion entries
**CORE CALCULATOR**
• Large calculator buttons with haptic feedback
• Memory functions (M+, M−, MC, MR) with indicator dot
• Long-press display to copy, double-tap to paste
• Standard or alternate key layout — choose what feels natural
• Display gestures for backspace, undo backspace, recall, clear, copy, and paste
**EVERYDAY TOOLS (Pro)**
• Tip & Split — tips, equal splits, rounded per-person totals, and by-share splits for uneven groups
• Discount Calculator — original price, savings, sale price, and tax
• Loan Calculator — mortgage, auto, student, and personal loans. Mortgages lead with the total monthly payment, with principal + interest and escrow (property tax, insurance, HOA) as immediate context. Includes payoff planning, extra-payment what-ifs, and full amortization details
• Unit Converter — length, weight, volume, and temperature conversions
**HISTORY & NOTES (Pro)**
• Save, review, search, and filter past calculations
• Name and pin saved calculations so important bills, payoff plans, and conversions are easier to find later
• Mortgage scenarios save with full escrow context (property tax, insurance, HOA, escrow toggle) so reopening a saved payoff plan restores the exact inputs
• Add notes to any calculation
• Share calculations with notes via Messages, Mail, or any app
• Lock important entries so they cannot be accidentally deleted
• Optional iCloud Sync across devices
**ALWAYS ACCESSIBLE**
• Home Screen widgets — small, medium, and large with configurable display modes (all free)
• Lock Screen widgets — accessory circular, rectangular, and inline (free)
• Control Center widgets — quick actions for calculator, tip, split, discount, unit converter, loan, and copy last result
• Siri Shortcuts — calculate tips, split bills, convert units including volume, and recall recent results
• Apple Watch companion — calculator, tip, discount, and split right on your wrist with all 10 themes synced
**THEMES AND LAYOUT**
• Animated mesh gradient backgrounds with true glassmorphism
• 4 free themes (Aurora, Calming Blues, Dark Glass, Pearl) plus 6 Pro themes
• Square or round buttons, plus standard or alternate key layout
**PRIVACY FIRST**
• No tracking, no analytics, no ads, no account required
• Your data stays on your device unless you choose optional iCloud Sync
**ACCESSIBILITY**
• VoiceOver, Dynamic Type, High Contrast mode, Reduced Motion, and alternative key layout
Built by a solo developer. Thanks for supporting independent apps.
Disclaimer: Calculations provided by prismCalc are for informational and illustrative purposes only. Results are estimates and do not constitute financial advice, guaranteed loan terms, or a commitment to lend. Actual rates and payments may vary based on lender-specific criteria. LaClair Technologies is not a financial institution.
Love how easy it is to split a dinner tip between friends.
Developer Response
Thanks for the first written review, Arsman129. Glad prismCalc is making the dinner math easier!
Layout fixes across iPhone, iPad, and Apple Watch, plus polish from a full-codebase quality pass.
Fixed:
• On iPhone, the calculator display no longer overlaps the clock and Dynamic Island — the keypad now sizes itself around the display correctly on every iPhone model
• On iPad mini in portrait, the display card no longer clips under the status bar
• On Apple Watch, all five keypad rows fit on screen at launch on every watch size, and the equals key is easier to read on every theme
• The display number now grows with your Dynamic Type text-size setting instead of staying fixed
• Asking Siri for a Pro tool (Tip, Split, Discount, Convert) now offers to open the app instead of stopping at an error
• Loan amounts of 1,000 and above now save correctly when your device uses German or French number formats
Changed:
• Multiplication, division, and minus now render as proper typeset symbols (× ÷ −) on the keypad, in the display, and in widgets
Added:
• iCloud Sync now tells you when it's paused because your iCloud storage is full, instead of pausing silently — look for the status in Settings
Version 1.1.4
The developer, Patrick LaClair, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
The developer indicated that this app supports the following accessibility features. Learn More