Function Calc vs Tempo Calendar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Function Calc
This app offers a powerful, programmable scientific calculator with graphing capabilities. It allows users to create custom functions, store equations, and perform complex calculations with ease. The interface features a visible tape display and supports dictation for statistical analysis.
- Programmable custom functions
- Graphing capabilities
- Tape display with edit/undo
- Unit conversions (120+)
- Dictate calculations
- Export graphs (PDF, PNG)
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A full-function, programmable, graphing scientific calculator designed to be very quick and easy to use, but with the added power of customisation. Tape display is visible while you type, and a swipe away from full screen view. Select and directly input any number from tape, undo or edit calculations. Easily create and use custom functions, store equations and useful numbers, use complex functions with multiple variables - fully programmable. Plot functions on a zoomable graph, export a high-resolution pdf copy. Dictate calculations and numbers for statistical analysis, with instant results. Completely free. • no adverts, no in-app purchases. • full set of scientific functions, unlimited nested brackets. • swipe to undo, step by step. • easily edit calculations and re-calculate. • optionally enter and edit calculations in standard maths format, rather than calculator order. • visible memory store. • tape output shows all calculations – swipe for full screen. • never type the same number twice – direct input from tape. • instantly convert between more than 120 different units. • zoomable text for easy reading and editing. • fully editable useful numbers page – store constants, conversion factors, commonly used numbers, tappable URLs or email addresses, or any text. • create, store and use functions for unit conversions or calculations, as simple as copy and paste. • dictate calculations, or lists of numbers for statistical analysis, get instant results. • create, edit and use complex functions with up to ten inputs or outputs – solve quadratic and cubic equations, calculate mortgage payments, compound interest, body mass index, triangles, the day of the week for any date, sunrise and sunset times and direction for any date and place, statistics (including normal, Student's T, Chi Square and F cumulative probability functions) and more – create or keep exactly what is useful, edit or delete what isn’t. 50 functions included. • fully zoomable graphing capability, plot one or two functions on a graph. Export PNG or high-resolution large pdf copies. • ideal for complex or repetitive tasks – custom functions reduce errors. • full help included.
Tempo Calendar
This app offers a streamlined calendar experience focused on essential features for quick access and readability. It integrates seamlessly with your existing system calendars and syncs automatically across devices.
- Seamless Apple Calendar Integration
- Automatic iCloud Sync
- Home Screen Monthly Widget
- Per-Event Colors
- Date Range Highlighting
- 30-Day Event Restore
- Event Search
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Tempo. A calendar in tune with your day. Tempo is a clean, lightweight calendar designed to make everyday actions quick and easy. We focus on a natural feel over flashy features, an at-a-glance view over complicated settings, and a clean interface. - A minimal layout that’s easy to read - Seamless integration with Apple Calendar - Automatic iCloud sync Key features [Full Apple Calendar integration] Tempo lets you view and edit events from every account connected to your device’s system calendar, including iCloud, Google, and Naver. There’s no need to move your data or create a new account. [Automatic iCloud sync] Events added on your iPhone automatically appear on your iPad and Mac. Events sync through your connected calendar accounts, while individual event colors, date ranges, and other details set in Tempo sync through iCloud. Add an appointment on your iPhone during your commute, then organize your schedule on your Mac at the office. Switch devices and pick up with the same events, without any extra steps. [Monthly and weekly Home Screen widgets] Add a large monthly calendar widget to your iPhone or iPad Home Screen. See a whole month of events at once, switch months, and add events right from the widget. Tap a date to open that day in your calendar. [Lock Screen widgets] Check a two-week calendar that includes today, or see upcoming events, right from your iPhone Lock Screen. Spot the days with plans or view up to three upcoming events to get a quick sense of your day without opening the app. [Custom colors for individual events] While the system calendar assigns colors by calendar, Tempo lets you choose a color for each event. Use red for important meetings, yellow for family plans, and green for study time to see what matters at a glance. [Date range highlights] Outline multi-day periods such as time off, business trips, vacations, or exams with a visual border on your calendar. Unlike a regular event entry, this makes the entire date range easy to see at a glance. [30-day event recovery] Accidentally deleted an event? Don’t worry. Tempo safely keeps snapshots of deleted events for 30 days. Bring them back at any time during that period from "Restore events" in Settings. [Notifications and quick access] Get notified at the time you choose so you don’t miss an important appointment. Tap a notification to go straight to the event. Tempo integrates smoothly with Apple’s notification system for a simple, familiar experience. [Event search] Quickly find events by title. Search ignores differences in case and diacritics, so even part of a word can help you find a matching event. What Tempo stands for [Smooth interactions] Every interaction should feel instant. Tempo focuses on natural, lightweight responses rather than heavy animations or complicated screen transitions. [Minimal design] Essential information is clear, and unnecessary elements are left out. By reducing visual clutter, Tempo helps you focus on your events. [At home in the Apple ecosystem] Tempo follows the design language of iOS, iPadOS, and macOS. It makes natural use of Apple’s built-in calendar, notifications, widgets, iCloud, and more. On the move or at your desk, keep your day flowing with Tempo. Tempo. A calendar in tune with your day.
Screenshots
Verdict
The clearest difference is update cadence: Tempo Calendar at every 3 days against Function Calc's monthly. Tempo Calendar also leads on review sentiment (100% vs 80%) and device support (3 vs 1). Function Calc's advantage is iOS requirement (18.6 vs 26.0). On price, rating, ratings volume and ads 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.
On the App Store both sit at effectively the same score — 5.0 for Function Calc against 5.0 for Tempo Calendar. Both are backed by a comparable volume of ratings — 3 and 8 respectively. Written reviews are what separate them: 80% of Function Calc's written reviews are positive against 100% of Tempo Calendar's.
Function Calc ships an update monthly, Tempo Calendar every 3 days. The most recent releases landed on October 7, 2026 and October 9, 2026 respectively.
| Parameter | Function Calc | Tempo Calendar |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) | 5.0 (8 ratings) |
| Positive reviews | 80.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 3 | 8 — better |
| Update frequency | Monthly | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone | iPhone, iPad, Mac — better |
| Requires iOS | 18.6 — better | 26.0 |
| Further details — not scored | ||
| Size | 5 MB | 69 MB |
| Age rating | 4+ | 4+ |
| Developer | Hugh Pelham | Rocky Lim |
Customer experience
Function Calc
Tempo Calendar
In-app purchases
Function Calc
No in-app purchases
Tempo Calendar
No in-app purchases
Questions
Is Function Calc free?
Is Tempo Calendar free?
Which has better reviews, Function Calc or Tempo Calendar?
Do Function Calc or Tempo Calendar have ads?
Which is updated more often, Function Calc or Tempo Calendar?
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