Comparison

Calculator + vs Chemistry Keyboard

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

Head to head
About

Calculator +

This app offers a free basic and scientific calculator with an elegant interface. Upgrade for advanced features like graphing, equation solving, and unit conversions. Supports fractions, percentages, and multiple themes.

Highlights
  • Free basic and scientific calculator
  • Elegant and intuitive interface
  • Advanced editing and equation display
  • Fraction and percent support
  • Graphing and equation solving
  • Base converter and multiple themes
Features
Read full description

Award winning calculator app for iPad and iPhone. Designed with simplicity, usability and beauty in mind! FEATURES: - Free basic calculator - Free scientific calculator - Elegant & Intuitive interface - Advanced editing by easily going back and forth - Displays both the equation & the result at the same time - Supports Fraction & Percent - Supports many scientific functions If you are looking for more advanced features you can upgrade to one or more of the following: - Fraction Calculator with feet, inches & cm support! - Solving for x with a polynomial Calculator for solving quadratic & cubic equations 2x³ - 4x² - 22x + 24 = 0 - Linear Equations Solver for solving system of linear equations 2x – y = 9 3x + 4y = –14 - Graphing Calculator to find the local min, max & intersection points y = 2x³ – 4x (x² + y²)³ = -27y²x² - Triangle Calculator - Cone Calculator - Arc Calculator - Circle Calculator - Base Converter ( HEX OCT BIN DEC ) - Multiple themes Enjoy the FREE Scientific calculator on your iPhone & iPad. If you like it, support us by upgrading or giving us a positive review. Thanks :) Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Chemistry Keyboard

Easily input chemical formulas with specialized superscript, subscript, and arrow characters. Access lowercase Greek letters and other chemistry-related Unicode symbols. This keyboard extension works offline and includes a demo for viewing Wikipedia data.

Highlights
  • Superscript characters
  • Subscript characters
  • Arrow glyphs
  • Lowercase Greek characters
  • Chemistry Unicode characters
  • Offline functionality
  • Wikipedia data lookup demo
Features
Read full description

The Chemistry Keyboard is a specialized Keyboard Extension for anyone who needs to enter chemical formulae. Ever need to input Hg²⁺+2 I⁻ on your phone and can't figure out how to get those nice superscript or subscript 2s. Or proper arrow glyphs? Quickly generate superscripts: ⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹ ⁽ ⁾ ⁺ ⁻, subscripts: ₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉ ₍ ₎ ₊ ₋, and arrows. lowercase Greek characters available in landscape mode. and other chemistry related Unicode characters. The app itself demonstrates the keyboard's use by allowing text entry and looking up data from Wikipedia. Unlike many keyboard extensions, this keyboard does not require network access. It's entirely self contained.

Screenshots

Calculator +4 screens
Chemistry Keyboard3 screens

Verdict

The call

The clearest difference is price: Calculator + at Free against Chemistry Keyboard's $1.99. Calculator + also leads on update cadence (every 5 days vs every 6 months) and ratings volume (10K vs 17). Chemistry Keyboard's advantage is in-app purchases (none vs 10) and ads (none vs shown). On rating, review sentiment, device support and iOS requirement 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 + is free to download; Chemistry Keyboard costs $1.99 up front. Calculator + sells 10 in-app purchases, starting at $4.99 per month. Chemistry Keyboard asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.6 for Calculator + against 4.6 for Chemistry Keyboard. That said, the two scores are not equally well evidenced: Calculator + has 10K ratings behind it against 17, so its average is the more settled of the two. Written reviews are what separate them: 85% of Calculator +'s written reviews are positive against 88% of Chemistry Keyboard's.

UpkeepUpdate frequency

Calculator + ships an update every 5 days, Chemistry Keyboard every 6 months. The most recent releases landed on November 3, 2026 and November 1, 2026 respectively.

Scorecard6 real differences · 4 level
Calculator + versus Chemistry Keyboard: the parameters behind the verdict, then further details
ParameterCalculator +Chemistry Keyboard
PriceFree — better$1.99
Rating4.6 (10K ratings)4.6 (17 ratings) — better
Positive reviews84.9% of reviews87.5% of reviews — better
Number of ratings10K — better17
Update frequencyEvery 5 days — betterEvery 6 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.415.0 — better
Further details — not scored
Size50 MB9 MB
Age rating4+4+
DeveloperxNeat.comGenerally Helpful Software

Customer experience

Calculator +

All ratings10,276 ratings
Positive91.9%
Neutral2.8%
Negative5.3%
Written reviews942 reviews
Positive84.9%
Neutral4.0%
Negative11.0%

Chemistry Keyboard

All ratings17 ratings
Positive94.1%
Neutral0.0%
Negative5.9%
Written reviews24 reviews
Positive87.5%
Neutral0.0%
Negative12.5%

Bugs and requests

Calculator +

Reported bugs

5 issues
  • Fraction calculator has TWO subtraction buttons and NO division button
  • Decimals seem to be changed to fraction with no apparent way of changing it back
  • Functionality is dropped by forcing you to the main menu every time you open it
  • Currency converter broken
  • Login screen freezes

Requested features

5 requests
  • Add mod function
  • Add commas
  • Add 1/x function
  • Support for Retina Display
  • Add number 4 with two lines

Chemistry Keyboard

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

Calculator +

Subscriptions2
  • Scientific Calculator3 Days trial$4.991 Month
  • Calculator7 Days trial$39.991 Year
One-time8
  • Linear Calculator$2.99
  • Factoring Calculator$2.99
  • Handwriting Calculator$2.99
Show 5 more
  • Graphing Calculator$3.99
  • Fraction Calculator$3.99
  • Scientific Calculator$4.99
  • Calculator Plus$4.99
  • Calculator$16.99
None

Chemistry Keyboard

No in-app purchases

Questions

Is Calculator + free?
Calculator + is free to download, with in-app purchases available.
Is Chemistry Keyboard free?
Chemistry Keyboard costs $1.99, with no in-app purchases.
Which has better reviews, Calculator + or Chemistry Keyboard?
Chemistry Keyboard is rated higher. Calculator + averages 4.6 out of 5 from 10K ratings, while Chemistry Keyboard averages 4.6 from 17 ratings.
Do Calculator + or Chemistry Keyboard have ads?
Calculator + shows ads; Chemistry Keyboard does not.
Which is updated more often, Calculator + or Chemistry Keyboard?
Calculator + ships an update every 5 days, and Chemistry Keyboard every 6 months. Most recently, Calculator + was updated on November 3, 2026 and Chemistry Keyboard on November 1, 2026.

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