iSolveModel vs Archie
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iSolveModel
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.
- Linear programming solver
- Simplex algorithm
- Integrated MIP solver
- Sensitivity analysis
- iTunes File Sharing
- Email model/solution transfer
- Text-based model documents
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Looking for a mathematical model solver running on your iPad/iPhone/iPod Touch? This is iSolveModel, an easy-to-use linear programming optimizer running on iPad as well as on iPhone and using the simplex algorithm method with pivot as the main solver engine as well as an integrated MIP solver for 0-1 variables and integer numbers. The purpose of this application is to provide a linear programming solver for the iPad/iPhone/iPod Touch community as well as for students and teachers, particularly for those in Operations Research / Operations Management / Industrial Engineering or related courses (college/undergraduate students). Features: - Number of decision variables and constraints only limited by the available memory of the device - Sensitivity analysis reports on variable coefficients and right-hand side when solving pure linear models - Documents can be transferred via iTunes File Sharing - Mathematical models and solutions can be sent by email - Model documents are text files, no proprietary format - Solution documents as HTML - Supports all device orientations Benefits: - Affordable - Easy-to-use modeling, models are like the ones in textbooks - Fast learning curve
Archie
Identify architectural styles and building features. Learn about specific structures, their architects, and the neighborhood's influence on design. An AI architect acts as your virtual guide and expert.
- Identify architectural styles
- Learn about building features
- Discover architects and their designs
- Explore neighborhood architectural influence
- AI virtual tour guide
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Point your camera at any building and know what you're looking at. Archie identifies the architectural style of any building from a photo, then teaches you why. Snap a facade and get the style, the era, the visible features that give it away, and the story behind it. It's like having an architecture professor in your pocket. HOW IT WORKS • Snap a building (or import a photo from your library) • Archie's AI matches it against 100 architectural styles, from Gothic to Googie, Brutalism to Beaux-Arts • See the features that signal the style: pointed arches, corbels, tracery, each explained in plain language • Recognized landmarks get their name, architect, and history • Every result includes a note about the exact building in your photo EXPLORE YOUR NEIGHBORHOOD The Map puts 5,700+ noteworthy buildings at your feet across 135 U.S. cities: famous landmarks and hidden gems, each with photos and the story of why it matters. See what's near you, filter for hidden gems, walk over, and photograph a mapped building to collect it. More cities on the way. LISTEN AS YOU LOOK Tap play and Archie reads the story aloud: on your results and on any mapped building. It's a walking tour that starts wherever you're standing. BUILD YOUR LIFELIST Every style you identify unlocks in your LifeList: a field guide of all 100 styles to collect, with real-world examples from around the globe. Spotting styles becomes a game you play with every walk. YOUR PERSONAL LIBRARY Every save keeps the photo and its full analysis, searchable and readable offline. Vacation buildings, hometown gems: your record of everything you've learned. MADE FOR EXPLORERS • Works worldwide, on anything from cathedrals to bungalows • Offline queue: snap now, analyze when you're back online • City map packs work offline once downloaded • Share cards for your best finds • No account, no login, no ads PRIVACY FIRST Your photos and identifications stay on your device. Photos are analyzed in the cloud but never stored there. Your coordinates never leave your phone. No account, no ads in the app, and no tracking across other apps: Archie never touches your advertising identifier. FREE & PREMIUM Your first 3 identifications are free, no strings. Archie Unlimited removes the limit and unlocks every place on the map, as a one-time lifetime unlock or a monthly plan. The monthly plan auto-renews until cancelled in your App Store settings. Your Library and LifeList stay fully readable without a subscription. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://app.notion.com/p/haus-Privacy-Policy-39ea618074a28027b5fcfc2b27194434
Screenshots
Verdict
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 rating (5.0 vs 4.8). On ads, in-app purchases, device support and iOS requirement 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
Archie is free to download; iSolveModel costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
iSolveModel holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Archie has 14 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 September 12, 2026 and September 17, 2026 respectively.
| Parameter | iSolveModel | Archie |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 5.0 (2 ratings) — better | 4.8 (14 ratings) |
| Positive reviews | 71.4% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 | 14 — better |
| Update frequency | Every 4 months | Every 6 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.1 | 17.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 56 MB |
| Age rating | 4+ | 4+ |
| Developer | MINDTech | Jason Girouard |
Customer experience
iSolveModel
Archie
In-app purchases
iSolveModel
No in-app purchases
Archie
No in-app purchases









