Vilter Select Lite vs DuctPro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Vilter Select Lite
Access your projects and compressor ratings offline with this utility app. Seamlessly sync files between your device and the cloud when an internet connection is available.
- Offline project access
- Compressor ratings
- Cloud file syncing
- On-the-go project management
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Vilter Select Lite provides current Vilter Select users to access their projects on-the-go and provide an offline solution to those users who need compressor ratings but do not have an internet connection for periods of time. When internet connection is available, users will be able to move files between their device and the cloud.
DuctPro
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DuctPro is the professional HVAC duct sizing calculator built for field technicians and MEP engineers. Get engineering-grade results in seconds — offline, no subscription. RESULTS IN 3 TAPS Enter airflow, select duct type, get the size. Round, rectangular, flat oval, and flexible ducts. Size by friction rate or air velocity. A color-coded performance badge tells you instantly if your duct is optimal, too fast, too slow, or at risk. ENGINEERING-GRADE ENGINE Calculations use the Darcy-Weisbach friction equation with Colebrook-White solver — the industry-standard method for duct design. Nine material types with published roughness values: galvanized steel (spiral & rectangular), flexible duct (metallic & non-metallic), fiberglass duct board, fibrous glass liner, PVC, aluminum, and concrete. FITTINGS & PRESSURE DROP Calculate total system pressure drop including straight run and all fittings. Ten fitting types with industry-standard loss coefficients: 90° and 45° elbows (round and rectangular), mitered elbow, tee branch and straight-through, concentric reduction, enlargement, and butterfly damper. PRO MODE Unlock full 2D lookup tables for rectangular elbows and concentric reductions, plus A/B ratio selector for flat oval ducts. Bilinear interpolation for accurate results at any H/W or area-ratio geometry. ORGANIZE YOUR WORK Save calculations with a custom name and notes. Group them into color-coded projects. Export individual calculations as text or PDF, and full projects as CSV. Search your entire history in one tap. IMPERIAL & METRIC Switch between I-P and SI units at any time. All inputs and outputs update instantly across every screen. I-P: CFM · in · ft/min · inWC/100ft SI: L/s · mm · m/s · Pa/m 6 LANGUAGES English · Français · Español · Português · Deutsch · Italiano — 100% offline. No account. No subscription. —
Screenshots
Verdict
The clearest difference is update cadence: DuctPro at weekly against Vilter Select Lite's every 9 months. Vilter Select Lite's advantage is iOS requirement (10.0 vs 17.0). On price, ads, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Vilter Select Lite ships an update every 9 months, DuctPro weekly. The most recent releases landed on October 6, 2026 and September 19, 2026 respectively.
| Parameter | Vilter Select Lite | DuctPro |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 9 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 10.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 60 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Copeland LP | High Intent Labs |
In-app purchases
Vilter Select Lite
No in-app purchases
DuctPro
No in-app purchases
