Psychro Chart vs Ductulator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Psychro Chart
This app simplifies complex air humidity calculations for humidification and heating needs. It allows for quick and accurate assessment of various scenarios using psychrometric or Mollier diagrams.
- Calculate air conditions
- Determine humidification/heating needs
- Perform psychrometric calculations
- Use Mollier diagrams
- Assess scenarios quickly
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The Psychro-Chart from Condair is a free app for calculating air conditions and the corresponding humidification or heating required. The generally complex air humidity calculations can be performed extremely accurately and simply, which means that a range of scenarios can be assessed quickly and straightforwardly.The Calculation can be done in a psychrometric Diagram or a Mollier-Diagram.
Ductulator
Instantly calculate HVAC duct sizes based on airflow, friction rate, or velocity. This tool provides accurate duct dimensions in seconds without needing charts, supporting various duct types and units.
- Instant duct sizing
- Friction rate or velocity calculation
- Multiple valid duct dimensions
- IP and SI units support
- Detailed sizing mode
- Rectangular, circular, and flexible ducts
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Size HVAC ducts instantly using airflow, friction or velocity. Get accurate duct dimensions in seconds — no charts required. • Get a range of suitable duct sizes based on friction rate or velocity. • Get multiple valid duct dimensions instantly. • Tap on Friction Rate or Velocity to toggle between calculation methods. • IP and SI units. • Detailed sizing mode to adjust the duct dimensions and air flow rates. • Supports rectangular, circular and flexible ducts. • Automatic friction and velocity updates. Calculations are based on standard air 0.075 lb/ft3 (1.2 kg/m3) in clean galvanized steel or non-metallic flexible ducts. Any feedback is welcome, and will be the basis for future updates.
Screenshots
Verdict
Psychro Chart and Ductulator both sit at 4.8 stars, but that hides the real split: 50% of Ductulator's written reviews are positive against 0% of Psychro Chart's. Ductulator also leads on ratings volume (353 vs 6) and update cadence (every 2 months vs every 9 months). Psychro Chart's advantage is price (Free vs $3.99) and iOS requirement (7.0 vs 18.6). On rating, ads, in-app purchases and monetization model 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
Psychro Chart is free to download; Ductulator costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.8 for Psychro Chart against 4.7 for Ductulator. That said, the two scores are not equally well evidenced: Ductulator has 353 ratings behind it against 6, so its average is the more settled of the two. Written reviews are what separate them: 0% of Psychro Chart's written reviews are positive against 50% of Ductulator's.
Psychro Chart ships an update every 9 months, Ductulator every 2 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | Psychro Chart | Ductulator |
|---|---|---|
| Price | Free — better | $3.99 |
| Rating | 4.8 (6 ratings) — better | 4.7 (353 ratings) |
| Positive reviews | 0.0% of reviews | 50.0% of reviews — better |
| Number of ratings | 6 | 353 — better |
| Update frequency | Every 9 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Best chart rank | — | #64 — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 7.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 27 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Condair GmbH | Wassim Murr |
Customer experience
Psychro Chart
Ductulator
Bugs and requests
Psychro Chart
Not enough reviews yet to summarise bugs or requests.
Ductulator
Reported bugs
4 issues- Decimal point doesn't work on calculator
- New flex option isn't working properly
- Friction rate can't be changed in the latest version
- Skips duct sizes (e.g., 24-26)
Requested features
5 requests- Ability to pick duct size and see CFM
- Include flat oval ducts
- Option to select round or square duct
- Ability to enter duct size and get CFM
- Option for flex duct
In-app purchases
Psychro Chart
No in-app purchases
Ductulator
No in-app purchases
Questions
Is Psychro Chart free?
Is Ductulator free?
Which has better reviews, Psychro Chart or Ductulator?
Do Psychro Chart or Ductulator have ads?
Which is updated more often, Psychro Chart or Ductulator?
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