InvenTree vs Ductalator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
InvenTree
Manage your inventory and stock control with this mobile application. It offers powerful, lightning-fast inventory knowledge in your pocket through tightly integrated barcode scanning.
- Inventory management
- Stock control database integration
- Barcode scanning
- Pocket inventory knowledge
- Native iOS integration
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This iOS app integrates natively with the InvenTree open source inventory management and stock control database. With tightly integrated barcode scanning functionality, the app provides powerful, lightning fast inventory knowledge in your pocket.
Ductalator
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Have you ever used the quintessential Trane Ductulator for your HVAC duct size calculations. Well here is a super easy to use Ductalator App that simplifies duct sizing calculations with the spin of a wheel. Simply enter two of the four parameters (Flow rate, Pressure drop, Velocity of Duct size) and the other values are calculated automatically for you. If you are involved in designing HVAC systems from small toilet exhaust through to multi-roomed variable air volume systems, this is the app for you. Download it and give it a free try. "Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/" "Privacy Policy: http://www.azitechgames.com/ductalator.html"
Screenshots
Verdict
The clearest difference is price: Ductalator at Free against InvenTree's $7.99. InvenTree's advantage is in-app purchases (none vs 2) and chart position (#148 vs unranked). On update cadence, ads, 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
Ductalator is free to download; InvenTree costs $7.99 up front. Ductalator sells 2 in-app purchases, starting at $1.99 per month. InvenTree asks for nothing beyond the download.
InvenTree ships an update weekly, Ductalator every 10 days. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.
| Parameter | InvenTree | Ductalator |
|---|---|---|
| Price | $7.99 | Free — better |
| Rating | 3.7 (3 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Weekly — better | Every 10 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Best chart rank | #148 — better | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 16.0 |
| Further details — not scored | ||
| Size | 58 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Oliver Walters | David Mepham |
In-app purchases
InvenTree
No in-app purchases
Ductalator
- Monthly Subscription$1.991 Month
- Annual Subscription1 Month trial$6.991 Year
Questions
Is InvenTree free?
Is Ductalator free?
Do InvenTree or Ductalator have ads?
Which is updated more often, InvenTree or Ductalator?
Other comparisons
