# iSolveModel vs Archie

The clearest difference is price: Archie at Free against iSolveModel's $9.99. Archie also leads on update cadence (every 6 days vs every 4 months) and review sentiment (100% vs 71%). iSolveModel's advantage is in-app purchases (none vs 4) and rating (5.0 vs 4.8). On ads, device support and iOS requirement there is nothing between them.

Archie is free to download; iSolveModel costs $9.99 up front. Archie sells 4 in-app purchases, starting at $2.99 per 7 days. iSolveModel asks for nothing beyond the download.

iSolveModel holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Archie has 15 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 71% of iSolveModel's written reviews are positive against 100% of Archie's, so the app with the better star average is not the one people write more warmly about.

iSolveModel ships an update every 4 months, Archie every 6 days. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | iSolveModel | Archie |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/isolvemodel/id387627473/reviews)** | [4.8 (15 ratings)](https://appshunter.io/ios/app/archie-identify-architecture/id6503988435/reviews) |
| Number of ratings | 2 | **15** |
| Positive reviews | 71.4% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 5 MB | 77 MB |
| Requires iOS | 17.1 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [MINDTech](https://appshunter.io/developer/382887010) | [Jason Girouard](https://appshunter.io/developer/1750592219) |

## What reviewers say

### iSolveModel

[App page](https://appshunter.io/ios/app/isolvemodel/id387627473)

This app offers a powerful linear programming solver for iOS devices, utilizing the simplex algorithm and an integrated MIP solver for integer variables. It's designed for students and professionals in operations research and related fields, allowing easy model creation and sharing.

**Highlights:** Linear programming solver, Simplex algorithm, Integrated MIP solver, Sensitivity analysis, iTunes File Sharing, Email model/solution transfer, Text-based model documents

**Features:** macOS Compatibility

**In-app purchases:** none


### Archie

[App page](https://appshunter.io/ios/app/archie-identify-architecture/id6503988435)

Point your camera at any building to instantly identify its architectural style, era, and key features. Explore a curated map of notable buildings, listen to narrated histories, and build a personal library of your discoveries.

**Highlights:** AI-powered building style identification, Detailed architectural feature analysis, Curated map of notable buildings, Spoken building histories and stories, Personalized library of identified buildings, Offline analysis and map packs

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Archie Unlimited — Weekly | $2.99 | per 7 days |
| Archie Premium Monthly | $2.99 | per month |
| Archie Unlimited — Annual | $19.99 | per year |
| Archie Unlimited — Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is iSolveModel free?

iSolveModel costs $9.99, with no in-app purchases.

### Is Archie free?

Archie is free to download, with in-app purchases available.

### Which has better reviews, iSolveModel or Archie?

iSolveModel is rated higher. iSolveModel averages 5.0 out of 5 from 2 ratings, while Archie averages 4.8 from 15 ratings.

### Do iSolveModel or Archie have ads?

Neither iSolveModel nor Archie shows ads.

### Which is updated more often, iSolveModel or Archie?

iSolveModel ships an update every 4 months, and Archie every 6 days. Most recently, iSolveModel was updated on November 1, 2026 and Archie on November 4, 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.*