Ductulator vs EraSpark AI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
EraSpark AI
An intelligent assistant offering three distinct modes: Past, Present, and Future. It helps users explore historical context, get real-time assistance, and discover forward-looking insights. Supports AI conversations, image and PDF analysis, and voice input.
- Past Mode for historical context
- Present Mode for real-time assistance
- Future Mode for forward-looking insights
- AI-powered conversations
- Image and PDF analysis
- Voice input support
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EraSpark AI is an intelligent assistant designed to help users explore ideas, learn, create, and solve problems through three unique perspectives: Past, Present, and Future. Key Features: • Past Mode – Explore historical context, lessons, and perspectives from the past. • Present Mode – Receive practical, real-time assistance for everyday questions and tasks. • Future Mode – Discover forward-looking insights, possibilities, and innovative ideas. Additional Features: • AI-powered conversations • Image analysis and understanding • PDF document analysis • Voice input support • Personalized interactions • Secure account access Whether you're studying, researching, brainstorming, or exploring new ideas, EraSpark AI helps you view information from different perspectives and make more informed decisions. Privacy Policy: https://docs.google.com/document/d/11NV1kQ-8CnyTgVPIFkvV8di-B4zz-78XurnLveFTvc8/edit?usp=sharing Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is price: EraSpark AI at Free against Ductulator's $3.99. EraSpark AI also leads on rating (5.0 vs 4.7) and iOS requirement (15.6 vs 18.6). Ductulator's advantage is in-app purchases (none vs 1) and ratings volume (353 vs 1). On update cadence, ads 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
EraSpark AI is free to download; Ductulator costs $3.99 up front. EraSpark AI sells 1 in-app purchase, starting at $9.99 per month. Ductulator asks for nothing beyond the download.
EraSpark AI holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Ductulator has 353 ratings behind it against 1, so its average is the more settled of the two.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 25, 2026 and October 1, 2026 respectively.
| Parameter | Ductulator | EraSpark AI |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 4.7 (353 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 353 — better | 1 |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Best chart rank | #86 — better | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.6 | 15.6 — better |
| Further details — not scored | ||
| Size | 1 MB | 63 MB |
| Age rating | 4+ | 4+ |
| Developer | Wassim Murr | Richardson Medor |
Customer experience
Ductulator
EraSpark AI
Bugs and 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
EraSpark AI
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Ductulator
No in-app purchases
EraSpark AI
- EraSpark Pro7 Days trial$9.991 Month
Questions
Is Ductulator free?
Is EraSpark AI free?
Which has better reviews, Ductulator or EraSpark AI?
Do Ductulator or EraSpark AI have ads?
Which is updated more often, Ductulator or EraSpark AI?
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