Comparison

PeterJohn NumPy vs PSRayTracing

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

Head to head
About

PeterJohn NumPy

Features
Read full description

****PeterJohnNumPyV4 Now You Can Use NumPy 1.20.2 on CPython3.9.9. ****How To Use NumPy on PeterJohnNumPyV4;; Go To "TutorialSeason003/scripts/s007LSTMtrainingPlot.py". Then "Run Script". ****Not Yet implemented Features;; Basically, you Can Use all Functions of numpy.ndarray. **1; numpy.random;; please use Python3 Standard "random" module instead of it. 1.1); numpy.random.randn();; So we implemented pjRandN() function using NumPy and Python3 Standard "random" module. Documents/TutorialSeason003/scripts/pjLStermMemory.py;pjRandN() **2; numpy.linalg;; 2.1); numpy.linalg.norm();; So we implemented pjNorm() function using NumPy instead of it. Documents/TutorialSeason003/scripts/pjLStermMemory.py;pjNorm() 2.2); numpy.linalg.qr();; So we implemented pjQR() function using NumPy instead of it. Documents/TutorialSeason003/scripts/pjLStermMemory.py;pjQR(); **3; numpy.diag();; Basically, you Can Use all Functions of numpy.ndarray, so Please use numpy.ndarray.diagonal() instead of it. **4; numpy.fft; Not Yet implemented. **5; numpy.polynomial;; Not Yet implemented. **6; numpy.ctypeslib;; Not Yet implemented. ****When you Use this App withOut NumPy;; Using iPhone's "Files.app", Delete the NumPy's "__pycache__" folder below. Documents/PeterJohnNumPyV4/usrLocal/lib/python3.9/site-packages/numpy/__pycache__ If there doesNot Exist the NumPy's "__pycache__" folder, when you touched "Edit Script", this App Calls "Py_FinalizeEx()" So you Can Enjoy Scripting Comfortably. ****the WorkAround against the Well-Known Bug of NumPy and Python3.9;; NumPy and Python3.9 have a Well-Known Bug. While NumPy has been imported, "Py_FinalizeEx()" doesNot Release memory. So If you imported NumPy at the Second time, Python3 Crashes. so we made a WorkAround against the Well-Known Bug of NumPy and Python3.9. As the Specification of this App, If there Exists the NumPy's "__pycache__" folder, Documents/PeterJohnNumPyV4/usrLocal/lib/python3.9/site-packages/numpy/__pycache__ Even if you touched "Edit Script", this App doesNot call "Py_FinalizeEx()" This is Not a Perfect Solution But you Can Enjoy NumPy withOut Python3 Crashing. ****1st Corinthians 10:31, GNT; 10:31 Well, whatever you do, whether you eat or drink, do it all for God's glory. Enjoy NumPy on PeterJohnNumPyV4. Best Regards, --Yasushi Yassun Obata

About

PSRayTracing

This application provides a graphical interface for a ray tracing engine, designed to render images faster than reference code. It includes features like threading and render progress visualization, based on "Ray Tracing in One Weekend" books.

Highlights
  • GUI frontend for ray tracing
  • Faster rendering than reference code
  • Threading support
  • Render progress visualization
  • Toggle-able features
  • Based on "Ray Tracing in One Weekend"
Features
Read full description

This is a GUI frontend for the PSRayTracing implementation of the "Ray Tracing in One Weekend" books by Peter Shirley (and others). Which renders the images in the book faster than the reference code, but also offers other features (e.g. threading, render progress, toggle-able and more). The source code for this program, as well as a report auditing all of the changes/improvements, is freely available at: https://github.com/define-private-public/PSRayTracing

Screenshots

PeterJohn NumPy4 screens
PSRayTracing4 screens

Verdict

The call

The clearest difference is price: PSRayTracing at Free against PeterJohn NumPy's $9.99. PeterJohn NumPy's advantage is update cadence (every 2 weeks vs every 30 months) and iOS requirement (15.0 vs 17). On ads, in-app purchases 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

PSRayTracing is free to download; PeterJohn NumPy costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

PeterJohn NumPy ships an update every 2 weeks, PSRayTracing every 30 months. The most recent releases landed on August 14, 2026 and September 23, 2026 respectively.

Scorecard3 real differences · 7 level
PeterJohn NumPy versus PSRayTracing: the parameters behind the verdict, then further details
ParameterPeterJohn NumPyPSRayTracing
Price$9.99Free — better
Rating—5.0 (2 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 2 weeks — betterEvery 30 months
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.0 — better17
Further details — not scored
Size222 MB29 MB
Age rating4+4+
DeveloperYasushi ObataBenjamin Summerton

In-app purchases

None

PeterJohn NumPy

No in-app purchases

None

PSRayTracing

No in-app purchases

Questions

Is PeterJohn NumPy free?
PeterJohn NumPy costs $9.99, with no in-app purchases.
Is PSRayTracing free?
PSRayTracing is free to download, with no in-app purchases.
Do PeterJohn NumPy or PSRayTracing have ads?
Neither PeterJohn NumPy nor PSRayTracing shows ads.
Which is updated more often, PeterJohn NumPy or PSRayTracing?
PeterJohn NumPy ships an update every 2 weeks, and PSRayTracing every 30 months. Most recently, PeterJohn NumPy was updated on August 14, 2026 and PSRayTracing on September 23, 2026.

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