iSolveWaiting vs VirtualKim
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iSolveWaiting
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This is iSolveWaiting, a waiting line calculator app to get queueing theory statistics and probabilities. A waiting line system is represented by units randomly arriving and trying to be serviced by one or more resources; however a queue line (or waiting line) is going to occur if those units arrive more rapidly than the capacity of the system. Queueing theory is studied in the field of operational research and statistics and probabilities are analytically determined. Usual statistics are utilization rate of the system, length of queue, length of system, time waiting in queue, time spent in the system. There are probabilities such as the probability of how busy the system is or not, the probability of an arrival having to wait or not, etc. Those performance measures are important as issues or problems caused by queueing situations are often related to customer dissatisfaction with service or may be the root cause of economic losses in a business. Analysis of the relevant queueing models allows the cause of queueing issues to be identified and the impact of proposed changes to be assessed. This version is universal: iPad and iPhone under 15 or later as well as on Apple Silicon Mac.
VirtualKim
Experience the 6502 microprocessor, the heart of 1970s home computers. This app emulates the 8-bit processor with an assembler and programming puzzles. Learn to code on a minimalist interface and discover how early computing was done.
- 6502 CPU emulation
- Built-in assembler
- Programming puzzles
- Minimalist UI with LEDs and buttons
- Monitor program for memory editing
- Debug and run applications
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The 6502 microprocessor changed the world. Released in the 1970’s, it was the reason that home computers were within the reach of many hobbyists. This app re-creates the 6502 CPU and some of the hardware that used it. This isn't a game (although games are included), this is an emulation of the 8-bit processor, complete with an assembler and some programming puzzles to solve. Start with the most basic user interface you can imagine - six 7-segment LEDs and some buttons - to enter, debug and run your applications. Then upgrade to a display and keyboard, and use the built-in monitor program to dump memory, makes edits and execute your code. Can you run BASIC? Maybe. FORTH? Perhaps. Assembler? Definitely! Don't think of this as a something "fun" or "enjoyable" in the traditional sense. Think of it as a puzzle: how on earth did those folks in the 1970's manage to do ANYTHING when computers were this basic? Documentation is provided, but to get the most of out of this app you'll need to do your own research. Just like in the 1970s. Features - KIM-1 keypad/LED mode simulator. - KIM-1 serial terminal mode simulator. - Apple 1 serial terminal mode simulator. - Multiple programs including Life, Mastermind, word games, Trek, and more. - Working 6502 Assembler with single-step, memory and register view. - A comprehensive 6502 tutorial system with interactive lessons and reference material. - Shareware! All features are always available without a purchase.
Screenshots
Verdict
The clearest difference is price: VirtualKim at Free against iSolveWaiting's $2.99. VirtualKim also leads on update cadence (weekly vs every 14 months). iSolveWaiting's advantage is in-app purchases (none vs 1) and iOS requirement (15.0 vs 17.0). 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
VirtualKim is free to download; iSolveWaiting costs $2.99 up front. VirtualKim sells 1 one-off in-app purchase. iSolveWaiting asks for nothing beyond the download.
iSolveWaiting ships an update every 14 months, VirtualKim weekly. The most recent releases landed on December 8, 2025 and September 9, 2026 respectively.
| Parameter | iSolveWaiting | VirtualKim |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | — | 4.8 (29 ratings) — better |
| Positive reviews | — | 84.6% of reviews |
| Number of ratings | — | 29 — better |
| Update frequency | Every 14 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 3 MB | 72 MB |
| Age rating | 4+ | 4+ |
| Developer | MINDTech | John Kennedy |
In-app purchases
iSolveWaiting
No in-app purchases
VirtualKim
- Buy Me a Coffee$0.99









