Comparison

Insterm vs Engineer's Unit Converter

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

Insterm

Features
Read full description

By specifying the host name (IP address, etc.), user name, password, and port number in the app, you can log in remotely using SSH. After logging in, you can display the terminal screen and perform command operations.

About

Engineer's Unit Converter

Features
Read full description

A unit converter built for engineering work rather than for the kitchen. Thirty-two categories, from the everyday ones to the specialist tables you normally go looking for in a handbook: AWG wire gauge, tons of refrigeration, viscosity, water hardness, radiation dose, moment of inertia. EVERY CATEGORY, ALL FREE Length, Area, Pressure/Stress, Mass/Weight, Energy/Work, Power, Force, Torque, Volume, Temperature, Time, Speed, Angle, Data, Frequency, Fuel Economy, Density, Flow, Viscosity, Acceleration, Electric Current, Voltage, Resistance, Electric Charge, Magnetic Flux Density, HVAC Cooling, Water Hardness, Radiation Activity, Radiation Dose, Radiation Equivalent Dose, Moment of Inertia, Wire Gauge. No unlocks, no ad to watch first, no timer. Every category above is open the moment you install. ENGINEERING TOOLS An expression calculator that accepts arithmetic, fractions and scientific notation, so you can type 3/8 or 1.2e-3 straight into the field. An HVAC sizing helper that turns tons of refrigeration into BTU/h, kW and rule-of-thumb airflow. Reference tables for physical constants, thermocouple types and hardness scales. BUILT FOR THE JOB Works fully offline, so it does not care about signal on site. Reads decimal commas and points the way your region writes them. Pin the units you use, hide the ones you never touch, and reorder the rest. Add your own units with a conversion factor. Every conversion is kept in a searchable history you can tap to reuse. No account, no sign-in, no data leaves the device.

Screenshots

Insterm3 screens
Engineer's Unit Converter4 screens

Verdict

The call

The clearest difference is in-app purchases: Insterm at none against Engineer's Unit Converter's 1. Engineer's Unit Converter's advantage is update cadence (monthly vs every 5 months). On price, ads, device support and iOS requirement there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Engineer's Unit Converter sells 1 one-off in-app purchase. Insterm asks for nothing beyond the download.

UpkeepUpdate frequency

Insterm ships an update every 5 months, Engineer's Unit Converter monthly. The most recent releases landed on October 6, 2026 and October 24, 2026 respectively.

Scorecard2 real differences ยท 4 level
Insterm versus Engineer's Unit Converter: the parameters behind the verdict, then further details
ParameterInstermEngineer's Unit Converter
PriceFreeFree
Update frequencyEvery 5 monthsMonthly โ€” better
AdsYesYes
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 โ€” better18.0
Further details โ€” not scored
Size10 MB7 MB
Age rating4+4+
DeveloperYusuke MoriJose Gerardo Palma Duran

In-app purchases

None

Insterm

No in-app purchases

1 purchases

Engineer's Unit Converter

One-time1
  • Remove Ads$0.99

Questions

Is Insterm free?
Insterm is free to download, with no in-app purchases.
Is Engineer's Unit Converter free?
Engineer's Unit Converter is free to download, with in-app purchases available.
Do Insterm or Engineer's Unit Converter have ads?
Both Insterm and Engineer's Unit Converter show ads.
Which is updated more often, Insterm or Engineer's Unit Converter?
Insterm ships an update every 5 months, and Engineer's Unit Converter monthly. Most recently, Insterm was updated on October 6, 2026 and Engineer's Unit Converter on October 24, 2026.

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