Comparison

PiSquared vs WriteTex

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

Head to head
About

PiSquared

Features
Read full description

PiSquared is an RPN-only calculator for the Apple Watch. It supports a wide variety of mathematical and scientific functions as well as binary operations for programmers. Integer, floating point (real) and complex numbers are equally supported. These functions are available: - calculation of the number of combinations or permutations for integer numbers - factorials for integer numbers or Gamma function for positive non-integer numbers - trigonometric, logarithmic, exponential and hyperbolic functions for floating point and complex numbers - date and time conversions - logical operations for binary, octal or hexadecimal numbers - cartesian to polar coordinate conversions and vice versa (floating point numbers) - degrees to radians and vice versa conversions (floating point numbers) - absolute, integer and fractional value of a number (floating point and partially complex numbers) - rounding of a real number (standard rounding and rounding up or down) - random number generator and some more. The calculator has a stack depth of ten and features ten additional storage registers. All storage registers and the stack can be inspected. The stack itself can be manipulated by moving it up or down or by swapping its two topmost elements.

About

WriteTex

Instantly convert handwritten math equations into LaTeX, Markdown, or TikZ code. This app uses advanced AI to recognize complex formulas, matrices, and diagrams, integrating seamlessly with desktop editors like VS Code and Obsidian.

Highlights
  • Handwritten math to LaTeX conversion
  • AI-powered OCR for complex formulas
  • Markdown and TikZ code output
  • Desktop sync for VS Code, Obsidian, Word
  • BYOK (Bring Your Own Key) for data control
  • High privacy options
Read full description

Stop struggling with complex LaTeX syntax. Convert your handwritten math equations into clean code instantly with WriteTex. Whether you are a researcher, student, or engineer, WriteTex bridges the gap between your physical notes and digital documents. Simply draw a formula and watch it transform into LaTeX, Markdown, or TikZ code ready for your favorite editor. POWERFUL MATH OCR Powered by advanced AI, WriteTex recognizes even the most complex mathematical structures, including matrices, integrals, Greek letters, and chemical diagrams. SEAMLESS WORKFLOW INTEGRATION WriteTex isn't just a converter; it’s a productivity powerhouse. Desktop Sync: Use our companion app to automatically paste converted equations directly into VS Code, Obsidian, Overleaf, or Microsoft Word. VS Code and Obsidian extension: Write on iPad, results appear in your editor on PC or Mac. Intergrate seamlessly with you current workflow with more precise OCR results. BUILT FOR POWER USERS BYOK (Bring Your Own Key): Connect your own API keys for full control over your data and costs. High Privacy: Your data belongs to you. We offer flexible configuration for privacy-conscious users. PERFECT FOR: Students: Speed up STEM homework and digitize lecture notes. Researchers: Quickly insert formulas into LaTeX manuscripts. Developers: Streamline math documentation in VS Code and Obsidian. Download WriteTex today and turn your handwriting into professional digital math in seconds.

Screenshots

WriteTex4 screens

Verdict

The call

The clearest difference is price: WriteTex at Free against PiSquared's $1.99. WriteTex also leads on update cadence (every 10 days vs every 23 months). PiSquared's advantage is in-app purchases (none vs 3) and chart position (#183 vs unranked). On 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

WriteTex is free to download; PiSquared costs $1.99 up front. WriteTex sells 3 in-app purchases, starting at $3.99 per month. PiSquared asks for nothing beyond the download.

UpkeepUpdate frequency

PiSquared ships an update every 23 months, WriteTex every 10 days. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

Scorecard5 real differences · 5 level
PiSquared versus WriteTex: the parameters behind the verdict, then further details
ParameterPiSquaredWriteTex
Price$1.99Free — better
Rating—3.0 (2 ratings) — better
Number of ratings—2 — better
Update frequencyEvery 23 monthsEvery 10 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
Best chart rank#183 — better—
DevicesiPhone, iPod, Apple WatchiPhone, iPad, Mac
Requires iOS13.0 — better17.0
Further details — not scored
Size3 MB14 MB
Age rating4+4+
DeveloperHartwig Wiesmann星宇 黄

In-app purchases

None

PiSquared

No in-app purchases

3 purchases

WriteTex

Subscriptions2
  • Monthly AI Subscription$3.991 Month
  • Yearly AI Subscription$39.991 Year
One-time1
  • Custom API$1.99

Questions

Is PiSquared free?
PiSquared costs $1.99, with no in-app purchases.
Is WriteTex free?
WriteTex is free to download, with in-app purchases available.
Do PiSquared or WriteTex have ads?
Neither PiSquared nor WriteTex shows ads.
Which is updated more often, PiSquared or WriteTex?
PiSquared ships an update every 23 months, and WriteTex every 10 days. Most recently, PiSquared was updated on October 30, 2026 and WriteTex on October 24, 2026.

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