Comparison

Calculator Plus #1 vs Calendar Countdown

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Calculator Plus #1

A straightforward calculator app designed for everyday math, school, budgeting, and shopping. It offers essential functions, a clear interface with large buttons, and a history log for reviewing past calculations. Advanced features include memory functions, percentage calculations, and multi-window support for efficient workflow.

Highlights
  • Basic arithmetic operations
  • Calculation history
  • Memory function
  • Percentage calculations
  • Large buttons and display
  • Customizable themes
  • Multi-window mode
Features
Read full description

All-in-one basic calculator app for iPhone and iPad. Calculator Plus combines a basic calculator and a scientific one, percentage and tax calculator, financial and date calculator, currency and unit converter in one easy-to-use app. Stop switching between multiple calculator apps. Calculate faster, stay organized, and get accurate results with Calculator Plus. * Looking for a basic calculator with history and memory? * Calculator Plus automatically saves calculations so you can review results, continue calculations later, compare numbers, track expenses, and avoid repeating work. * Need a scientific calculator for school, engineering, or advanced math?* Use logarithms, trigonometric functions, exponents, algebra, scientific formulas, parentheses, and multi-step equations in one powerful calculator. * Need a percentage calculator while shopping? * Whether you’re asking “How much is 20% off?” or “What tip should I leave?”, Calculator Plus delivers accurate answers. Quickly calculate discounts, sales tax, tips, markups, profit margins, percentage increases, and percentage decreases. * Looking for a budgeting and finance calculator? * Track expenses, calculate bills, compare prices, plan budgets, and organize calculations with notes and history. * Need a currency converter and calculator in one app? * Convert currencies and measurement units while performing calculations - ideal for travel, shopping, business, and everyday use. * “How many days until my trip?” * Need a date calculator? Count days, calculate age, track deadlines, plan vacations, and manage important events. * Calculator Widget * Add the widget to your home screen for instant access. * Notes and Saved Calculations * Attach notes to saved calculations to organize expenses, transactions, tax records, budget plans, and currency conversions. * Perfect for: * — Everyday calculations — Scientific calculations and algebra for students — Shopping discounts and percentages — Budgeting, bills, and expenses — Tax and financial calculations — Currency and unit conversion — School homework and study — Multi-step equations with history — Date, age, and days calculations * Why Do Users Choose Calculator Plus? * Many calculator apps focus on only one task. Calculator Plus combines a scientific calculator, financial calculator, percentage calculator, tax calculator, currency converter, unit converter, date calculator, notes, history, widget, and multi-window support in one app. * Who Is Calculator Plus Designed For? * — Students and schoolchildren — Engineers and technical professionals — Business owners and freelancers — Finance professionals — Travellers and shoppers — Families managing household budgets Whether you need a calculator for budgeting, taxes, shopping, school, business, travel, engineering, or everyday math, Calculator Plus gives you all the tools you need in one app.

About

Calendar Countdown

Features
Read full description

Your calendar already knows your deadlines. Your countdown app should too. Calendar Countdown pulls directly from your existing calendars and turns any event into a live countdown. No manual syncing. No wasted time. Select a calendar. Instantly see every upcoming date as a countdown inside the app and on your widget. Other apps make you re-enter everything. This one reads what’s already there. * Uses your existing calendar data * Real-time countdowns for every event * Clean widget, no setup friction * Zero ads * No subscriptions * No in-app purchases Pay once. $0.99. Done. Stop managing dates twice.

Screenshots

Calculator Plus #14 screens
Calendar Countdown3 screens

Verdict

The call

The clearest difference is price: Calculator Plus #1 at Free against Calendar Countdown's $0.99. Calculator Plus #1 also leads on iOS requirement (15 vs 17.6). Calendar Countdown's advantage is in-app purchases (none vs 7) and ads (none vs shown). On 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

CostPrice · In-app purchases · Ads · Monetization

Calculator Plus #1 is free to download; Calendar Countdown costs $0.99 up front. Calculator Plus #1 sells 7 in-app purchases, starting at $0.99 per month. Calendar Countdown asks for nothing beyond the download.

UpkeepUpdate frequency

Calculator Plus #1 ships an update every 5 weeks, Calendar Countdown daily. Both last shipped on November 5, 2026.

Scorecard5 real differences · 5 level
Calculator Plus #1 versus Calendar Countdown: the parameters behind the verdict, then further details
ParameterCalculator Plus #1Calendar Countdown
PriceFree — better$0.99
Rating4.8 (5.1K ratings) — better—
Positive reviews88.5% of reviews—
Number of ratings5.1K — better—
Update frequencyEvery 5 weeksDaily — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15 — better17.6
Further details — not scored
Size157 MB1 MB
Age rating4+4+
DeveloperDigitAlchemy LLCIan Seyler

Bugs and requests

Calculator Plus #1

Reported bugs

2 issues
  • App crashes or doesn't open
  • Ads still show up even after paying to remove them

Requested features

3 requests
  • Add brackets/parentheses for arithmetic operations
  • Improve arithmetic operator priority
  • Add more algebraic and trigonometric functions

Calendar Countdown

Not enough reviews yet to summarise bugs or requests.

In-app purchases

7 purchases

Calculator Plus #1

Subscriptions4
  • Calculator with History7 Days trial$0.991 Month
  • Calculator with History7 Days trial$1.491 Month
  • Simple Calculator - No Ads7 Days trial$6.291 Year
Show 1 more
  • Simple Calculator - No Ads7 Days trial$8.991 Year
One-time3
  • Remove ads$3.99
  • Multiple Basic Calculations$8.99
  • Multiple Basic Calculations$12.99
None

Calendar Countdown

No in-app purchases

Questions

Is Calculator Plus #1 free?
Calculator Plus #1 is free to download, with in-app purchases available.
Is Calendar Countdown free?
Calendar Countdown costs $0.99, with no in-app purchases.
Do Calculator Plus #1 or Calendar Countdown have ads?
Calculator Plus #1 shows ads; Calendar Countdown does not.
Which is updated more often, Calculator Plus #1 or Calendar Countdown?
Calculator Plus #1 ships an update every 5 weeks, and Calendar Countdown daily. Most recently, Calculator Plus #1 was updated on November 5, 2026 and Calendar Countdown on November 5, 2026.

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