Ductulator vs Inservice
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.
Inservice
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Streamline Your Service Operations Inservice is a comprehensive service management platform designed for businesses that need efficient order tracking, repair coordination, and technician management. Built with modern technology and an intuitive Georgian interface. Key Features: Order Management • Track service requests in real-time • Manage repairs and maintenance orders • View detailed order history and status updates • Smart status badges for instant recognition Technician Coordination • Assign technicians to service calls • Track arrival times and job progress • Monitor standby mode and urgent requests • Real-time location and status updates Comprehensive Reporting • Detailed service history tracking • Last service date monitoring • Response time analytics • Performance insights Modern Interface • Beautiful dark/light theme support • Intuitive Georgian language interface • Responsive design for all devices • Professional badge system for status tracking Communication Tools • Built-in chat system for coordination • Real-time notifications • Order approval and decline workflows • Seamless team communication Perfect For: • Service companies and technicians • Maintenance teams • Field service operations • Georgian businesses requiring localized solutions Experience professional service management with Inservice - where efficiency meets innovation.
Screenshots
Verdict
The clearest difference is price: Inservice at Free against Ductulator's $3.99. Inservice also leads on update cadence (fortnightly vs every 2 months) and iOS requirement (15.1 vs 18.6). Ductulator's advantage is chart position (#35 vs unranked). On 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
Inservice is free to download; Ductulator costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Ductulator ships an update every 2 months, Inservice fortnightly. The most recent releases landed on October 26, 2026 and October 13, 2026 respectively.
| Parameter | Ductulator | Inservice |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 4.7 (353 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 353 — better | — |
| Update frequency | Every 2 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Best chart rank | #35 — better | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 1 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Wassim Murr | Inservice LLC |
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
Inservice
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Ductulator
No in-app purchases
Inservice
No in-app purchases









