Comparison

addition calc vs Inbox Zero

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

Head to head
About

addition calc

This calculator app clearly displays inputs and sums on separate rows for easy understanding. Perform basic arithmetic operations with large, accessible buttons. Customize decimal places and rounding for precise calculations.

Highlights
  • Separate input and sum display
  • Large buttons for easy input
  • Supports four input operations
  • Customizable decimal places
  • Adjustable rounding settings
  • Optional vibration feedback
Features
Read full description

The input (lower row) and the sum (upper row) are separated, so you can always understand the answer. How to use is simple, just enter the numbers and press the add button. Four input operations can be performed on the input (lower row), and the results can be added. You can set the total number of decimal places and rounding. You can also activate the vibrator when you touch the iPhone.

About

Inbox Zero

Features
Read full description

Inbox Zero is your personal AI-powered email assistant that helps you write, reply, clean, and stay focused. Say goodbye to clutter and chaos. Say hello to clarity and calm. Smart Email Productivity, Reimagined Using advanced AI, Inbox Zero offers smart inbox cleanup, email writing automation, and priority sorting to help you gain control of your day. Clean your inbox in seconds with auto triage & Gmail decluttering tools Generate replies instantly with AI email writing and smart suggestions Unsubscribe from noise, highlight what matters Build better habits with your personal email coach Plan daily sessions with our focused email planner Send cold emails with confidence using AI-powered outreach Stay private — we never store or sell your email content Built-In Tools to Save Your Sanity Whether you're juggling multiple inboxes or just want less digital noise, Inbox Zero is your smart inbox manager: • AI-powered email writer • Email auto-reply and response suggestions • Automated inbox triage & filters • Cold email generator & outreach tool • Daily email routine tracker • Gmail and Outlook integration • Priority inbox scanner • Digest summaries & batching options Perfect For: • Professionals overloaded with daily emails • Entrepreneurs and founders with high-volume inboxes • Students balancing school and communication • Freelancers and consultants who send outreach daily • Anyone who wants their inbox to finally feel under control Why It Works Inbox Zero combines powerful AI with clean design and focused productivity tools. It’s not just an app — it’s your inbox clarity coach, your AI reply engine, and your productivity partner. Clean smarter. Reply faster. Focus better. Please note: The core functionality of the app requires a premium subscription. Without activating the subscription, app features will be limited. Privacy You Can Trust We use secure APIs. Your emails are never stored, sold, or analyzed for advertising. Terms & Privacy Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://sites.google.com/view/inbox-zero-smart-mail

Screenshots

addition calc4 screens
Inbox Zero4 screens

Verdict

The call

The clearest difference is in-app purchases: addition calc at none against Inbox Zero's 3. addition calc also leads on iOS requirement (9.3 vs 15.6). On price, ads and 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

Both are free to download. Inbox Zero sells 3 in-app purchases, starting at $6.99 per 7 days. addition calc asks for nothing beyond the download.

Scorecard2 real differences · 6 level
addition calc versus Inbox Zero: the parameters behind the verdict, then further details
Parameteraddition calcInbox Zero
PriceFreeFree
Positive reviews100.0% of reviews—
Update frequencyMonthly—
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS9.3 — better15.6
Further details — not scored
Size13 MB108 MB
Age rating4+4+
DeveloperShozo ObayashiMehmet Turkmen

In-app purchases

None

addition calc

No in-app purchases

3 purchases

Inbox Zero

Subscriptions3
  • Weekly$6.997 Days
  • Monthly$14.991 Month
  • Annualy$59.991 Year

Questions

Is addition calc free?
addition calc is free to download, with no in-app purchases.
Is Inbox Zero free?
Inbox Zero is free to download, with in-app purchases available.
Do addition calc or Inbox Zero have ads?
Neither addition calc nor Inbox Zero shows ads.

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