Instrument Toolbox vs GasUnits
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Instrument Toolbox
A professional calculator designed for industrial control, automation, and instrumentation engineers. It offers quick conversions and calculations for gas concentration, units, steam properties, flange levels, and pipeline flow. Ideal for both field debugging and engineering design.
- PPM to mg/m³ conversion with compensation
- Industrial unit conversion (pressure, volume, temp, etc.)
- Saturated steam pressure and density calculator
- Flange level migration calculations
- Pipeline flow and velocity calculator
- Real-time calculation results
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Industrial Control & Instrumentation Toolbox - Your Smart Industrial Calculator A professional calculation toolbox designed for industrial control, automation, and instrumentation engineers. Whether for field debugging or engineering design, it helps you quickly complete various professional calculations. Core Features: PPM to mg/m³ Converter: Gas concentration unit conversion, supports custom molecular weight, built-in quick selection of common gas molecular weights, with environmental temperature and pressure compensation Unit Converter: Covers easy conversion of industrial measurement units including: Pressure (8 units including MPa, kPa, bar, psi, etc.) Volume Temperature Length Mass Saturated Steam Calculator: Input temperature to obtain saturated steam pressure, or input pressure to calculate saturated steam density, meeting steam system design requirements Flange Level Migration: Supports single/dual flange level calculations, with inputs for medium density, flange distance, and other parameters for precise level measurement calibration Pipeline Flow & Velocity Calculator: Applicable for both gas and liquid media, integrates velocity calculation, flow calculation, and diameter calculation, incorporating temperature, pressure, and other operating conditions Key Features: Clean and intuitive interface, easy operation Real-time calculation results Supports standard and operating condition conversions Built-in reference values like standard atmospheric pressure Suitable for both field engineering and design office scenarios This app is an essential professional tool for industrial automation, significantly improving engineering calculation efficiency. Target Users: Automation Engineers, Instrumentation Engineers, Process Engineers, Equipment Engineers, and other industrial control professionals.
GasUnits
This app simplifies complex natural gas and LNG unit conversions for industry professionals. It accurately converts over 90 volume, rate, and price units, offering precise results and composition-based estimates. Easily copy formatted results for reports and models.
- Converts 90+ gas volume, rate, and price units
- Supports three standard gas heating values
- Calculates barrels of oil equivalent
- Provides composition-based estimates
- Fast, intuitive, and error-proof design
- Copy results for reports and models
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GasUnits by Gulfstream LNG is the industry’s most versatile universal gas‑unit converter — purpose‑built for professionals who work with natural gas and LNG. Our sector deals in billions, trillions, and even giga‑ and peta‑scale units, where a single miscalculation can derail a deal, distort a forecast, or undermine a technical analysis. GasUnits removes that risk. Created by Vivek Chandra, a seasoned LNG and gas entrepreneur, GasUnits is a free public‑service app designed to simplify the complex. It converts 90+ gas volume, rate, and price units with precision, delivering exact results where possible and smart, composition‑based estimates where required. Choose from three standard gas heating values (1000, 1036, or 952 Btu/ft³), switch between gas volume, gas rate, and gas price calculators, and even compute barrels of oil equivalent using either 6,000 ft³ or 5,800 ft³ per boe. Every result is cleanly formatted and can be copied instantly into your reports, emails, or models. Designed to be fast, easy to use, intuitive, and error‑proof, GasUnits helps traders, engineers, analysts, and commercial teams move with confidence — whether you’re validating a calculation, checking a contract number, confirming a conversion on the go, or aligning stakeholders around a single defensible figure. GasUnits by Gulfstream LNG — simplifying the world’s most complex gas conversions, one calculation at a time. A public service by Gulfstream LNG is an independent LNG export project under development in Louisiana, USA. Disclaimer: Conversions use industry-standard factors. Verify any critical conversions against authoritative sources. GasUnits by Gulfstream LNG is provided for reference only; GasUnits and its creators and supporters (including Vivek Chandra and Gulfstream LNG Development, LLC) accept no responsibility or liability. Do not rely on this tool for commercial, financial, technical, or other decisions. Feed back should be sent to Vivek Chandra at vc@GulfstreamLNG.com
Screenshots
Verdict
The clearest difference is price: GasUnits at Free against Instrument Toolbox's $1.99. Instrument Toolbox's advantage is iOS requirement (13.0 vs 15.1). On update cadence, 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
GasUnits is free to download; Instrument Toolbox costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Instrument Toolbox ships an update weekly, GasUnits every 10 days. The most recent releases landed on October 9, 2026 and October 7, 2026 respectively.
| Parameter | Instrument Toolbox | GasUnits |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | — | 1 — better |
| Update frequency | Weekly — better | Every 10 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 8 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | 立娜 王 | Vivek Chandra |
In-app purchases
Instrument Toolbox
No in-app purchases
GasUnits
No in-app purchases
Questions
Is Instrument Toolbox free?
Is GasUnits free?
Do Instrument Toolbox or GasUnits have ads?
Which is updated more often, Instrument Toolbox or GasUnits?
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