# My Lisp vs PeterJohn NumPy

The clearest difference is price: My Lisp at $3.99 against PeterJohn NumPy's $9.99. My Lisp also leads on chart position (#38 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.

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.

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.

## The numbers

| Metric | My Lisp | PeterJohn NumPy |
| --- | --- | --- |
| Price | **$3.99** | $9.99 |
| Rating | **[4.1 (17 ratings)](https://appshunter.io/ios/app/my-lisp/id1245341806/reviews)** | — |
| Number of ratings | **17** | — |
| Positive reviews | 68.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Monetization | Paid | — |
| Best chart rank | **#38** | — |
| Size | 19 MB | 222 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Laurent Rodier](https://appshunter.io/developer/697920086) | [Yasushi Obata](https://appshunter.io/developer/899977114) |

## What reviewers say

### My Lisp

[App page](https://appshunter.io/ios/app/my-lisp/id1245341806)

**Currently charting:** #38 Top Paid · Developer Tools (US App Store)

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:** Vision Pro support

**In-app purchases:** none


### PeterJohn NumPy

[App page](https://appshunter.io/ios/app/peterjohn-numpy/id1662896316)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*