linear programming vs DuelEng
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
linear programming
This app helps users set up and solve linear programming problems using the simplex method. It offers step-by-step progress tracking and in-depth analysis of results, suitable for students, researchers, and professionals.
- Simplex method implementation
- Step-by-step problem solving
- In-depth result analysis
- Model optimization
- Progress tracking
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Optimization is a modern tool that enables you to quickly set up linear programming problems based on the simplex method, progress step by step on the table, and perform in-depth analysis of the results. Students, researchers, and professionals working with data can confidently optimize the model by following every step toward the solution, whether in the classroom or on real projects.
DuelEng
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Learn English vocabulary with meanings in Turkish, German, Spanish or Russian. DuelEng combines short lessons, smart review and friendly competition in one clear learning path. Choose the language that supports you best, follow CEFR levels from A1 to C2, explore themed vocabulary packs and strengthen difficult words with mistake review. When you are ready, test yourself in ranked 1v1 matches or create private 1v1 and 2v2 rooms to play with friends. Key features: β’ English vocabulary supported by Turkish, German, Spanish and Russian meanings β’ One-minute vocabulary lessons β’ CEFR paths from A1 to C2 β’ Topic and skill-based learning packs β’ Smart review for mistakes and challenging words β’ Ranked 1v1 English duels β’ Private 1v1 and 2v2 rooms with code or link invitations β’ Daily quests, streaks, XP and badges β’ Weekly leagues and progress tracking β’ Friends and in-app chat Practice a little every day, keep your streak alive and turn new words into lasting knowledge. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: linear programming at none against DuelEng's 2. linear programming also leads on ads (none vs shown). DuelEng's advantage is update cadence (every 8 days vs every 5 months) and iOS requirement (16.6 vs 18.0). On price and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. DuelEng sells 2 in-app purchases, starting at $3.99 per month. linear programming asks for nothing beyond the download.
linear programming ships an update every 5 months, DuelEng every 8 days. The most recent releases landed on September 29, 2026 and October 9, 2026 respectively.
| Parameter | linear programming | DuelEng |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | β |
| Update frequency | Every 5 months | Every 8 days β better |
| Ads | No β better | Yes |
| In-app purchases | No β better | Yes |
| Monetization | Free | β |
| Devices | iPhone, iPad β better | iPhone |
| Requires iOS | 18.0 | 16.6 β better |
| Further details β not scored | ||
| Size | 3 MB | 28 MB |
| Age rating | 4+ | 12+ |
| Developer | MEHMET CELIK | Erdener YAVUZ |
In-app purchases
linear programming
No in-app purchases
DuelEng
- DuelEng Premium Monthly$3.991 Month
- DuelEng Premium Yearly$39.991 Year
Questions
Is linear programming free?
Is DuelEng free?
Do linear programming or DuelEng have ads?
Which is updated more often, linear programming or DuelEng?
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