Comparison

My Lisp vs PeterJohn NumPy

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

Head to head
About

My Lisp

A comprehensive Lisp programming environment for iOS and macOS devices. It offers a local interpreter, editor, and extensive libraries for learning and developing Lisp programs, including advanced mathematical functions and symbolic derivation.

Highlights
  • Local Lisp interpreter
  • Integrated editor
  • Core and mathematical operators
  • Advanced mathematics functions
  • Symbolic derivation module
  • Library and example files
  • User and reference manuals
Features
Read full description

My Lisp is a complete and universal Lisp environment running directly on the iPhone, iPad, and Mac. This interpreter is true to the original John McCarthy Lisp implementation with the fundamental 7 operators quote, atom, eq, car, cdr, cons, cond, along with lambda and label. My Lisp also contains core and mathematical operators borrowed from other Lisp dialects (Le Lisp, Lisp 1.5, MacLisp, Common Lisp and Scheme to name a few) to make it easy to learn, program, and most importantly, enjoy Lisp. It also features built-in functions for advanced mathematics, including complex numbers and numerical analysis (roots and zeros finder, integral approximation). The complete description of the fundamental, core, and built-in functions is available using a set of library functions completely written in My Lisp. My Lisp offers an interpreter and an editor, all working on the iPhone, iPad, and Mac, and most importantly, without requiring any server connection, that is, the interpreter is executing locally on the iPhone, iPad or Mac My Lisp is installed on. Library and example files contain the source code of classical functions and problems solved by My Lisp and may be used as reference to learn Lisp and develop other programs. They include classical puzzles (hanoi and n-queens), basic mathematical functions (gcd, lcm, factorial, fibonacci, prime?), and the historical apply, mapcar and maplist functions. The Lambda Calculus example file contains various functions related to Lambda Calculus and Combinators, with alpha-conversion, beta-reduction, de Bruijn notations, etc. As a special note, the example file Symbolic Derivation contains a complete yet extensible symbolic derivation module allowing to compute the formal derivation of virtually any symbolic function expressed as a Lisp expression. A user manual and a reference manual are available from within the application but also on My Lisp web site (https://lisp.lsrodier.net) and in Apple Books. The complete source code of the library and example files is part of My Lisp. Last but not least, this overview couldn’t end without a sample definition of the notorious REPL function: (define (REPL eval_me) (REPL (println (eval (read)))))

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

Screenshots

My Lisp4 screens
PeterJohn NumPy4 screens

Verdict

The call

The clearest difference is price: My Lisp at $3.99 against PeterJohn NumPy's $9.99. My Lisp also leads on chart position (#37 vs unranked). PeterJohn NumPy's advantage is update cadence (every 2 weeks vs every 6 weeks) and iOS requirement (15.0 vs 18.0). 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

My Lisp costs $3.99 and PeterJohn NumPy $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

My Lisp ships an update every 6 weeks, PeterJohn NumPy every 2 weeks. The most recent releases landed on October 12, 2026 and August 14, 2026 respectively.

Scorecard4 real differences · 7 level
My Lisp versus PeterJohn NumPy: the parameters behind the verdict, then further details
ParameterMy LispPeterJohn NumPy
Price$3.99 — better$9.99
Rating4.1 (17 ratings) — better—
Positive reviews68.8% of reviews—
Number of ratings17 — better—
Update frequencyEvery 6 weeksEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
Best chart rank#37 — better—
DevicesiPhone, iPad, Mac — betteriPhone, iPod
Requires iOS18.015.0 — better
Further details — not scored
Size19 MB222 MB
Age rating4+4+
DeveloperLaurent RodierYasushi Obata

In-app purchases

None

My Lisp

No in-app purchases

None

PeterJohn NumPy

No in-app purchases

Questions

Is My Lisp free?
My Lisp costs $3.99, with no in-app purchases.
Is PeterJohn NumPy free?
PeterJohn NumPy costs $9.99, with no in-app purchases.
Do My Lisp or PeterJohn NumPy have ads?
Neither My Lisp nor PeterJohn NumPy shows ads.
Which is updated more often, My Lisp or PeterJohn NumPy?
My Lisp ships an update every 6 weeks, and PeterJohn NumPy every 2 weeks. Most recently, My Lisp was updated on October 12, 2026 and PeterJohn NumPy on August 14, 2026.

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