PiSquared vs WriteTex
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PiSquared
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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.
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.
- 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
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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
Verdict
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
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.
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.
| Parameter | PiSquared | WriteTex |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | — | 3.0 (2 ratings) — better |
| Number of ratings | — | 2 — better |
| Update frequency | Every 23 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Best chart rank | #183 — better | — |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, Mac |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 3 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Hartwig Wiesmann | 星宇 黄 |
In-app purchases
PiSquared
No in-app purchases
WriteTex
- Monthly AI Subscription$3.991 Month
- Yearly AI Subscription$39.991 Year
- Custom API$1.99









