Comparison

Soulver 4 vs PDF Squeezer

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

Head to head
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/

About

PDF Squeezer

Reduce PDF file sizes on your iPhone or iPad with customizable compression settings. Preview changes before saving and process files securely offline. Automate tasks with iOS Shortcuts integration and compress multiple files at once.

Highlights
  • Customizable compression settings
  • Preview compressed PDFs
  • Offline, on-device processing
  • iOS Shortcuts integration
  • Batch compression
Features
Read full description

PDF Squeezer, the beloved Mac app, is now available for iPhone and iPad! Effortlessly reduce PDF file sizes with customizable compression settings to save space without losing quality. Process files securely on your device, ensuring total privacy with no internet connection required. Experience this well-known app's magic with an unlimited free trial! Customizable Compression Choose from light, moderate, or strong settings to balance file size reduction and quality, right from your iPhone or iPad. See Before You Save Preview your compressed PDFs directly on your device. Ensure the quality meets your needs before saving. Privacy-Focused Compression PDF Squeezer's on-device compression keeps your PDFs private and secure, eliminating the need for an Internet connection. Streamline Your Workflow PDF Squeezer integrates deeply with iOS, including a Shortcuts action for custom workflows. Automate your PDF compression tasks. Batch Compression Compress multiple PDF files at the same time to speed up your work. PDF Squeezer is also available for Mac and Windows as a separate purchase.

Screenshots

Soulver 44 screens
PDF Squeezer4 screens

Verdict

The call

The clearest difference is ratings volume: Soulver 4 at 429 against PDF Squeezer's 22. Soulver 4 also leads on review sentiment (76% vs 64%). PDF Squeezer's advantage is monetization model (free with in-app purchases vs paid). On price, rating, update cadence and ads 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. Soulver 4 sells 14 in-app purchases, starting at $26.00 per year and PDF Squeezer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Soulver 4 against 4.8 for PDF Squeezer. That said, the two scores are not equally well evidenced: Soulver 4 has 429 ratings behind it against 22, so its average is the more settled of the two. Written reviews are what separate them: 76% of Soulver 4's written reviews are positive against 64% of PDF Squeezer's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 14, 2026 and October 17, 2026 respectively.

Scorecard3 real differences · 7 level
Soulver 4 versus PDF Squeezer: the parameters behind the verdict, then further details
ParameterSoulver 4PDF Squeezer
PriceFreeFree
Rating4.9 (429 ratings) — better4.8 (22 ratings)
Positive reviews76.0% of reviews — better63.6% of reviews
Number of ratings429 — better22
Update frequencyMonthlyMonthly
AdsNoNo
In-app purchasesYesYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS17.617.0 — better
Further details — not scored
Size39 MB29 MB
Age rating4+4+
DeveloperZac CohanDaniel Witt

Customer experience

Soulver 4

All ratings429 ratings
Positive97.7%
Neutral0.5%
Negative1.9%
Written reviews242 reviews
Positive76.0%
Neutral7.9%
Negative16.1%

PDF Squeezer

All ratings22 ratings
Positive95.5%
Neutral0.0%
Negative4.5%
Written reviews22 reviews
Positive63.6%
Neutral4.5%
Negative31.8%

Bugs and 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

PDF Squeezer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

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
1 purchases

PDF Squeezer

One-time1
  • Full Version$9.99

Questions

Is Soulver 4 free?
Soulver 4 is free to download, with in-app purchases available.
Is PDF Squeezer free?
PDF Squeezer is free to download, with in-app purchases available.
Which has better reviews, Soulver 4 or PDF Squeezer?
Soulver 4 is rated higher. Soulver 4 averages 4.9 out of 5 from 429 ratings, while PDF Squeezer averages 4.8 from 22 ratings.
Do Soulver 4 or PDF Squeezer have ads?
Neither Soulver 4 nor PDF Squeezer shows ads.
Which is updated more often, Soulver 4 or PDF Squeezer?
Soulver 4 ships an update monthly, and PDF Squeezer monthly. Most recently, Soulver 4 was updated on October 14, 2026 and PDF Squeezer on October 17, 2026.

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