Comparison

Calculator₊ vs ERIS Mobile

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 comprehensive suite of calculation tools, including basic, scientific, and unit conversions. It features an AI-powered math solver that can solve problems from photos and provides a dedicated space for math notes. Accessibility features ensure ease of use for all users.

Highlights
  • Basic and scientific calculations
  • Unit and currency converter
  • AI-powered math solver with photo recognition
  • Math notes with instant solutions
  • Calculation history log
  • Accessibility features (Dynamic Text Size, VoiceOver, High-Contrast Mode)
Features
Read full description

America's #1 Calculator App! Download Calculator₊ Now - Your All-in-One Math Solution! We're excited to announce the biggest update to Calculator₊ in 10 years! With over 200 million downloads and a whopping 3 million+ 5-star ratings, Calculator₊ is the trusted choice of millions worldwide. And now, it's even better! More Than Just Your Average Calculator! • Standard Calculator: Breeze through basic arithmetic operations like addition, subtraction, multiplication, and division. • Scientific Calculator: Tackle complex calculations with ease, including trigonometric, logarithmic, and exponential functions. • Calculation History: Keep track of your past calculations with a detailed history log. • Unit Converter: Effortlessly convert units like inches to centimeters and much more, making it a handy tool for everyday use. • Percentage Calculator: Easily calculate percentages, increases, and decreases with pre-designed input fields that do the work for you. • Currency Converter: Convert currencies in real-time, including Bitcoin, with the latest exchange rates. • Fraction Calculator: Work seamlessly with fractions – perfect for students and professionals alike. • Ad-Free Experience: Say goodbye to annoying full-screen ads and focus on your calculations. Be Amazed by Our New AI-Powered Math Solver! • AI Math Solutions: Instantly solve math equations, quizzes, and word problems with our advanced AI. Use the Photo Solver to snap a picture of any problem, and Calculator₊ will work its magic. • Math Notes: A dedicated note-taking tool for all your math needs. Jot down equations, diagrams, and notes in a space designed for mathematical thinking. • Instant Math: In Math Notes mode, simply write an equation, add an "=", and Calculator₊ will generate the solution in real-time. Built for Everyone, Now Even More Accessible! Calculator₊ is designed to work effortlessly for all users, no matter how you use your iPhone, and includes these additional accessibility features: • Dynamic Text Size: Scale the calculator interface to the text size that works best for you, without losing layout clarity. • VoiceOver Support: Navigate & Calculate using VoiceOver, fully compatible with iOS accessibility settings. • High-Contrast Mode: A bold, high-contrast display that makes every button and result instantly readable in any lighting condition. • Dark and Light Mode: Calculator₊ automatically adjusts to your preferred mode. Why Choose Calculator₊? • Proven Track Record: Over a decade of providing fast and reliable calculations. • Loved by Millions: Join the 200+ million users who rely on Calculator₊, with an average rating of 4.7 stars from 3.5 million reviews. • Versatile & Powerful: Handles everything from basic sums to advanced scientific calculations. Perfect for school, work, or home. Celebrate with a Special Gift! To celebrate the release of this massive update, we're offering a 1-MONTH FREE TRIAL of our premium features, including: • Ad-Free Experience: No more pesky ads. • Unlimited AI Math Solving: Solve as many equations and problems as you need. • Unlimited Fraction Calculations: Ideal for students and professionals alike. • Unlimited Currency Conversions: Including real-time Bitcoin conversions. • Premium Customer Support: Get priority assistance from our expert support team. If you have any suggestions or questions, our support team is ready to help. Simply email us at support@impalastudios.com. Terms & Conditions: https://impalastudios.com/terms Privacy Policy: https://impalastudios.com/privacy

About

ERIS Mobile

This app helps environmental professionals conduct site visits for property due diligence. It allows users to capture photos, record notes, complete checklists, and access environmental data and historical maps related to a project.

Highlights
  • Site visit data capture
  • Photo and field note recording
  • Checklist completion
  • Interactive environmental data display
  • Access to historical maps
  • Property and surrounding area data
Features
Read full description

The ERIS Mobile app allows environmental professionals to perform efficient and effective site visits in order to complete their environmental due diligence on properties. The mobile app captures photos, field notes, enables completion of site visit checklists and interactively displays ERIS-provided environmental data and historical products related to a project for comprehensive assessment. All ERIS' environmental records can be accessed for the subject property and surrounding area included in the study, as well as, any map layers including: Historical Aerials, Topographic Map, Fire Insurance Maps, etc.

Screenshots

Calculator₊4 screens
ERIS Mobile4 screens

Verdict

The call

The clearest difference is review sentiment: ERIS Mobile at 100% against Calculator₊'s 63%. ERIS Mobile also leads on in-app purchases (none vs 10) and ads (none vs shown). Calculator₊'s advantage is update cadence (every 3 weeks vs every 4 months) and ratings volume (1.7M vs 6). On price 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

Both are free to download. Calculator₊ sells 10 in-app purchases, starting at $0.99 per month. ERIS Mobile asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Calculator₊ holds the better App Store score, 4.7 against 4.3. That said, the two scores are not equally well evidenced: Calculator₊ has 1.7M ratings behind it against 6, so its average is the more settled of the two. Written reviews complicate that: 63% of Calculator₊'s written reviews are positive against 100% of ERIS Mobile's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Calculator₊ ships an update every 3 weeks, ERIS Mobile every 4 months. The most recent releases landed on November 10, 2026 and November 3, 2026 respectively.

Scorecard10 real differences · 1 level
Calculator₊ versus ERIS Mobile: the parameters behind the verdict, then further details
ParameterCalculator₊ERIS Mobile
PriceFreeFree
Rating4.7 (1.7M ratings) — better4.3 (6 ratings)
Positive reviews63.1% of reviews100.0% of reviews — better
Number of ratings1.7M — better6
Update frequencyEvery 3 weeks — betterEvery 4 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank#97 — better—
DevicesiPhone, iPad, iPod, Apple Watch, Vision Pro — betteriPhone, iPad
Requires iOS15.0 — better17.0
Further details — not scored
Size247 MB26 MB
Age rating4+4+
DeveloperImpala StudiosEnvironmental Risk Information Services ERIS

Customer experience

Calculator₊

All ratings1,736,431 ratings
Positive92.2%
Neutral3.5%
Negative4.3%
Written reviews3,118 reviews
Positive63.1%
Neutral6.2%
Negative30.8%

ERIS Mobile

All ratings6 ratings
Positive83.3%
Neutral0.0%
Negative16.7%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Calculator₊

Reported bugs

2 issues
  • Incorrect calculation results for certain functions
  • Inability to delete last entered digit without clearing entire calculation

Requested features

3 requests
  • Ability to delete individual calculation history entries
  • More free advanced calculator features (fractions, currency, etc.)
  • Improved ad placement that doesn't interfere with usage

ERIS Mobile

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

Calculator₊

Subscriptions10
  • Premium Member Special Offer7 Days trial$0.991 Month
  • Monthly Premium Member3 Days trial$0.991 Month
  • 1 Month Premium Access7 Days trial$1.491 Month
Show 7 more
  • Half-Yearly Premium Member3 Days trial$3.996 Months
  • Calculate Faster, AI, & No Ads3 Days trial$4.997 Days
  • 1 Year Ad-Free3 Days trial$5.991 Year
  • Calculate Faster, AI, & No Ads3 Days trial$5.997 Days
  • 1 Month Premium Trial1 Month trial$5.997 Days
  • Math Solver/Full Access/No Ads$5.997 Days
  • 6 Months Premium Access7 Days trial$8.996 Months
None

ERIS Mobile

No in-app purchases

Questions

Is Calculator₊ free?
Calculator₊ is free to download, with in-app purchases available.
Is ERIS Mobile free?
ERIS Mobile is free to download, with no in-app purchases.
Which has better reviews, Calculator₊ or ERIS Mobile?
Calculator₊ is rated higher. Calculator₊ averages 4.7 out of 5 from 1.7M ratings, while ERIS Mobile averages 4.3 from 6 ratings.
Do Calculator₊ or ERIS Mobile have ads?
Calculator₊ shows ads; ERIS Mobile does not.
Which is updated more often, Calculator₊ or ERIS Mobile?
Calculator₊ ships an update every 3 weeks, and ERIS Mobile every 4 months. Most recently, Calculator₊ was updated on November 10, 2026 and ERIS Mobile on November 3, 2026.

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