Comparison

Calzy vs Soulver 4

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

Head to head
About

Calzy

This app offers a modern and intuitive way to perform everyday calculations. It features a unique Memory Area for reusing values, bookmarking for saved calculations, and leverages the latest iOS technologies for a seamless experience. Designed with privacy in mind, it's suitable for students and professionals alike.

Highlights
  • Memory Area for reusing values
  • Calculation bookmarking with titles
  • Basic and advanced calculation modes
  • Privacy mode with Face ID
  • Live Activity and Haptic Touch support
  • Customizable keypad layout
  • Dark and Light modes
Features
Read full description

Make your day-to-day calculations quick, easy, and beautiful with Calzy. Whether you're a student, professional, or just looking for a better way to manage your everyday math, Calzy is the perfect solution. With its advanced features and gorgeous design, Calzy will quickly become your go-to calculator. One of its standout features is the "Memory Area," where you can store and easily reuse multiple numerical values with just a drag and drop. Another one is the bookmarking feature, allowing you to save any calculation with a title for future reference. Using the latest iOS technology, like Live Activity, Drag and Drop, Haptic Touch, Face ID, and more, Calzy makes mathematical problem-solving a seamless experience. And with privacy being our top concern, rest assured your data stays with you. Key Features: • Memory Area for saving and reusing numerical values • Basic and advanced modes • History and Bookmarking with privacy mode (Face ID support) • Clean, modern, and beautiful design • Privacy-conscious app • Multitasking with slide-over and split view for iPad • Haptic Feedback for a more immersive experience • Tax + and Tax - functions • Quick toggle for decimal and currency rounding • Smart parenthesis • Today widget and iMessage extension • Ability to edit keypad layout • Apple Pencil 2 support and external keyboard support • Dynamic type support for enhanced readability • Custom App Icon support for a personalized touch • Universal app for iPhone, Apple Watch, and iPad • Handoff support, start on one device and resume on another • iCloud sync • Dark and Light modes with multiple color accents • Regional support for countries using decimal commas • Instant calculations as you type • Bookmarks are available in the Spotlight search • Universal purchase for all your devices • Family Sharing support • Localized in Chinese, Japanese, French, Italian, Russian and German Powered by the latest iOS technology, Calzy is the calculator for the new age.

About

Soulver 4

This app combines the functionality of a notepad with a powerful calculator. It allows users to perform complex calculations using natural language, supports unit conversions, date math, and live currency conversions. Organize your calculations in sheets with text comments and share them as PDFs.

Highlights
  • Natural language calculations
  • Unit and currency conversions
  • Date and time math
  • Live currency and stock prices
  • Customizable accessory keyboards
  • Spreadsheet-like line references
  • Variables and conditional statements
Features
Read full description

Ever reach for a calculator and the back of an envelope to work something out? That's what Soulver is for. It's a natural-language notepad calculator: think through a problem line-by-line, using plain words and numbers. The answers appear alongside each line as you type. Soulver isn't just a calculator app — it's the paper you'd scribble on to figure something out. Except this paper does the numbers for you, so you stay thinking at the level of your problem. 20% of $1,480 | $296 $100 in EUR | €86 240 km in miles | 149 mi $1,200 + 15% tax | $1,380 3 weeks from today | June 21 Because Soulver uses sheets (like Notes), you can explore different ideas: weigh options, change variables and watch everything update. WHAT CAN SOULVER CALCULATE? – Live currency conversions — 190 currencies, including crypto – Percentages in plain language — "20% off $50", "$50 is what % of $200" – Unit conversions — hundreds of units across length, weight, volume, data and more – Dates & time — "days until Christmas", time intervals, clock and video-timecode math – Time-zone conversions — "3pm New York to London" – Sums & averages – Financial functions — compound interest, mortgage repayments, hourly rates It's the closest thing to an on-device universal calculator ever created. DESIGNED FOR IPHONE – A meticulously designed numeric keyboard that makes calculating fast – Six specialised accessory keyboards — for currencies, percentages, dates & times, and variables – Build your own custom keyboard with the buttons you reach for most BEST-IN-CLASS ON IPAD – Multiple windows, Slide Over & Split View — float Soulver alongside Notes or Safari – Full Magic Keyboard support with dozens of keyboard shortcuts – Scribble & Apple Pencil – Find & replace, a line-styling palette and a powerful text editor – Automation with URL schemes & Siri Shortcuts POWER USER FEATURES – Multi-word variables — "total cost = $750" – Inline tokenized references to previous answers – Subtotals, tags & trip planning – Wolfram|Alpha integration – Headings, comments, labels & dividers to structure long sheets – Custom units and global variables in the definition sheet SHARING & SYNC – Sync your sheets with Soulver 4 for Mac via iCloud – Export to PDF & plain text, or send beautiful HTML emails – Share a calculation as an image — just take a screenshot ONE TIME PURCHASE Soulver is a one-time (non-subscription) purchase. We've been refining and improving Soulver since 2005, and major paid updates average once every 7 years. Try it free for 60 days, no commitment, no automatic charge. —————————————————————————————— Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Calzy4 screens
Soulver 44 screens

Verdict

The call

The clearest difference is price: Soulver 4 at Free against Calzy's $1.99. Soulver 4 also leads on rating (4.9 vs 4.7) and iOS requirement (17.6 vs 26.0). Calzy's advantage is update cadence (every 2 days vs monthly) and chart position (#150 vs unranked). On review sentiment, ads, in-app purchases and monetization model 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

Soulver 4 is free to download; Calzy costs $1.99 up front. Calzy sells 3 one-off in-app purchases and Soulver 4 sells 14 in-app purchases, starting at $26.00 per year. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Soulver 4 holds the better App Store score, 4.9 against 4.7. Both are backed by a comparable volume of ratings — 1.9K and 429 respectively. Written reviews split almost evenly too, at 77% and 76% positive.

UpkeepUpdate frequency

Calzy ships an update every 2 days, Soulver 4 monthly. Both last shipped on September 26, 2026.

Scorecard6 real differences · 5 level
Calzy versus Soulver 4: the parameters behind the verdict, then further details
ParameterCalzySoulver 4
Price$1.99Free — better
Rating4.7 (1.9K ratings)4.9 (429 ratings) — better
Positive reviews76.7% of reviews — better75.8% of reviews
Number of ratings1.9K — better429
Update frequencyEvery 2 days — betterMonthly
AdsNoNo
In-app purchasesYesYes
MonetizationPaidPaid
Best chart rank#150 — better—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, Mac
Requires iOS26.017.6 — better
Further details — not scored
Size66 MB39 MB
Age rating4+4+
DeveloperRaja VijayaramanZac Cohan

Customer experience

Calzy

All ratings1,899 ratings
Positive92.9%
Neutral1.8%
Negative5.2%
Written reviews584 reviews
Positive76.7%
Neutral7.7%
Negative15.6%

Soulver 4

All ratings429 ratings
Positive97.7%
Neutral0.5%
Negative1.9%
Written reviews240 reviews
Positive75.8%
Neutral7.9%
Negative16.3%

Bugs and requests

Calzy

Not enough reviews yet to summarise bugs or requests.

Soulver 4

Reported bugs

3 issues
  • Crashes when using certain emojis in sheet titles
  • Issues with iCloud sync and data migration from older versions
  • Inconsistent behavior when modifying variables and formulas

Requested features

4 requests
  • Improved iPad and iPhone UI/UX
  • Enhanced data export and sharing options
  • More advanced mathematical and scientific functions
  • Ability to define custom units and unit conversions

In-app purchases

3 purchases

Calzy

One-time3
  • Small Tip$0.99
  • Medium Tip$3.99
  • Huge Tip$9.99
14 purchases

Soulver 4

Subscriptions1
  • AI Assistant, Stocks & Weather$26.001 Year
One-time13
  • Complementary UpgradeFree
  • 30-day free trial (for iPhone)Free
  • 60-day free trial (for iPad)Free
Show 10 more
  • 60-day free trial (for Mac)Free
  • Soulver 4 for iPhone (upgrade)$7.49
  • Soulver 3 for iPhone$14.00
  • Soulver 4 for iPhone$15.00
  • Soulver 3 for iPad$20.00
  • Soulver 4 (Upgrade from Soulver 3)$29.00
  • Soulver 4 (Promotion)$39.00
  • Soulver 3 for Mac$39.00
  • Soulver 4$54.00
  • Soulver 4$59.00

Questions

Is Calzy free?
Calzy costs $1.99, and also offers in-app purchases.
Is Soulver 4 free?
Soulver 4 is free to download, with in-app purchases available.
Which has better reviews, Calzy or Soulver 4?
Soulver 4 is rated higher. Calzy averages 4.7 out of 5 from 1.9K ratings, while Soulver 4 averages 4.9 from 429 ratings.
Do Calzy or Soulver 4 have ads?
Neither Calzy nor Soulver 4 shows ads.
Which is updated more often, Calzy or Soulver 4?
Calzy ships an update every 2 days, and Soulver 4 monthly. Most recently, Calzy was updated on September 26, 2026 and Soulver 4 on September 26, 2026.

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