Gear Design vs Nitrox by Envivia
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Gear Design
Design involute gears with a CAD interface, allowing visual assessment through touch gestures. Generate and export STL data for 3D printing and perform tooth bending strength analysis with PDF sharing.
- Involute gear design
- CAD interface
- Touch gesture controls (zoom, rotate)
- STL data generation
- Email export
- Tooth bending strength analysis
- PDF sharing
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Gear Design is great in designing involute gears from scratch. Application includes a CAD interface in front end where users can assess designed gears visually with their finger gestures (zoom, rotate, twist etc.). Users can easily generate STL data of the CAD model and export them via Email (Two step action: first generate data and then export via Email). Tooth bending strength analysis calculator is included with multiple sharing options, including a pdf file.
Nitrox by Envivia
This app is a premium digital guide for Nitrox diving, offering educational content and calculation tools to optimize dives. It helps divers understand oxygen limits, plan dives using gradient factors, and prepare for certification.
- Calculate MOD (Maximum Operating Depth)
- Manage oxygen partial pressure (PPO₂)
- Optimize Nitrox dive planning
- Understand oxygen-related physiological limits
- Prepare for Nitrox certification
- Multilingual support
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[Master Nitrox] Nitrox is a premium digital guide dedicated to Nitrox diving (EANx). Designed to support divers in their training and progression, the app combines clear educational content, technical expertise, and reliable calculation tools to optimize every dive. [What Nitrox Allows You To Do] • Accurately calculate your MOD (Maximum Operating Depth) • Manage oxygen partial pressure (PPO₂) • Optimize your Nitrox dive planning using gradient factors • Understand oxygen-related physiological limits • Effectively prepare for your Nitrox certification [A True Educational Companion] Nitrox is designed for: Divers preparing for a Nitrox certification Recreational divers looking to improve their safety Experienced divers seeking to deepen their knowledge Instructors looking for a structured and reliable support tool The app is more than just a calculator: it helps you understand, anticipate, and adapt your dive parameters. [Important] Nitrox is an educational aid for dive planning. It does not replace recognised training, your training agency’s procedures, or a dive computer. Every dive plan must be adapted to actual conditions, the divers’ experience, and the dive team’s agreed procedures. This is not a medical device. [Multilingual] Available in French, English, Spanish, Italian, and German. [About Nitrox Premium] • Payment will be charged to your iTunes account at confirmation of purchase. • The subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period. • Your account will be charged for renewal within 24 hours prior to the end of the current period. • Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription. • Subscriptions may be managed by the user, and auto-renewal may be turned off in the iTunes account settings after purchase. Privacy Policy https://envivia.fr/policy/nitrox/privacy/ Terms of Use – EULA https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is review sentiment: Nitrox by Envivia at 100% against Gear Design's 0%. Nitrox by Envivia also leads on price (Free vs $2.99) and rating (5.0 vs 1.5). Gear Design's advantage is in-app purchases (none vs 4) and iOS requirement (9.3 vs 15.6). On ratings volume and ads 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
Nitrox by Envivia is free to download; Gear Design costs $2.99 up front. Nitrox by Envivia sells 4 in-app purchases, starting at $9.99 per year. Gear Design asks for nothing beyond the download.
Nitrox by Envivia holds the better App Store score, 5.0 against 1.5. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews point the same way: 0% of Gear Design's written reviews are positive against 100% of Nitrox by Envivia's.
Gear Design ships an update every 12 months, Nitrox by Envivia every 6 weeks. The most recent releases landed on October 9, 2026 and October 23, 2026 respectively.
| Parameter | Gear Design | Nitrox by Envivia |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 1.5 (2 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 12 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 9.3 — better | 15.6 |
| Further details — not scored | ||
| Size | 38 MB | 72 MB |
| Age rating | 4+ | 12+ |
| Developer | DRH YAZILIM VE MUHENDISLIK HIZMETLERI LTD STI | ENVIVIA |
Customer experience
Gear Design
Nitrox by Envivia
In-app purchases
Gear Design
No in-app purchases
Nitrox by Envivia
- Premium$9.991 Year
- Thank you$1.99
- Popular$9.99
- Generous$49.99
Questions
Is Gear Design free?
Is Nitrox by Envivia free?
Which has better reviews, Gear Design or Nitrox by Envivia?
Do Gear Design or Nitrox by Envivia have ads?
Which is updated more often, Gear Design or Nitrox by Envivia?
Other comparisons
