Comparison

P/T Manager vs HydroTech Pocket Engineer

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

Head to head
About

P/T Manager

Features
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The new Pressure and Time app is an essential management tool to have for any non-renewable gas resource. Pressure, bars, hectopascals and other metrics used to measure pressure all require additional calculations in the operational use of any gas. Time is a universal metric understood by virtually anyone in the world and does not require translation or conversion to understand quantity and consumption. Cylinder size, Flow rate and pressure quantity amount (PSI, BARA, KPA, etc) are all that are needed to arrive at a duration (time remaining). The Pressure and Time app will count down numerically in hours, minutes and seconds. An outside color ring is also another indication of time remaining. If the ring is Green there is more than :45 minutes of the gas remaining. If the ring is yellow then there is less than :45 minutes of gas remaining and if the ring is red there is less than :15 minutes of gas remaining. The Pressure and Time app is currently designed for oxygen cylinders whose normal oxygen capacity is 1850 psi when full, but the user can enter as high as 2000 psi for gas expansion. Additional gases will be added in the future. If you have a specific gas you would like to have available please contact us at www.adsopp.com. The Pressure in Time (P/T) Manager comes with a 30 day free trial period where the user can cancel at any time by deselecting the buy option (or whatever you are using to turn the subscription on/off) anytime before the end of the 29th day. After this you will be charged $3.99 USD for a one year (365 day) subscription. The subscription will end at midnight on the 365th day after the day of purchase. β€’ Auto-renewable subscription- The subscription will renew itself automatically at the end of the 365 day period unless the auto-renew option is turned off as described below. β€’ 30 day - Free trial period, no obligation and can cancel anytime during that period. After 30 days the user will get charged $3.99 for an annual subscription. β€’ Your subscription will be charged to your iTunes account at confirmation of purchase and will automatically renew itself at the end of 365 days unless auto-renew is turned off at least 24 hours before the end of the current period. β€’ Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your iTunes Account Settings after purchase. β€’ Privacy policy:https://adsopp.com/eops/terms

About

HydroTech Pocket Engineer

Features
Read full description

HydroTech Pocket Engineer gives field operators and engineers instant access to essential pipeline and nitrogen calculators directly from their phone. Built for real-world jobsite conditions, Pocket Engineer is designed to deliver fast, accurate results when timing, safety, and precision matter most. Whether you’re planning a job, verifying calculations in the field, or making quick decisions under pressure, this tool puts HydroTech’s proven calculation methods in your pocket. Key Features β€’ Pipeline volume calculations for fast job planning β€’ Nitrogen calculations for purging and testing β€’ Clean, mobile-friendly interface built for field use β€’ Instant access with no complicated setup β€’ Always up to date with the latest HydroTech tools Built for the Field Pocket Engineer is designed for operators, technicians, and engineers working in pipeline testing, pre-commissioning, and field operations. It eliminates the need for manual calculations and reduces the risk of error in critical workflows. Powered by HydroTech Developed by HydroTech Testing, this app extends the same tools and methodologies used on active job sites into a simple, mobile-first experience.

Screenshots

P/T Manager3 screens
HydroTech Pocket Engineer3 screens

Verdict

The call

The clearest difference is in-app purchases: HydroTech Pocket Engineer at none against P/T Manager's 1. HydroTech Pocket Engineer also leads on update cadence (monthly vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. P/T Manager sells 1 in-app purchase, starting at $3.99 per year. HydroTech Pocket Engineer asks for nothing beyond the download.

UpkeepUpdate frequency

P/T Manager ships an update every 4 months, HydroTech Pocket Engineer monthly. The most recent releases landed on October 5, 2026 and October 1, 2026 respectively.

Scorecard2 real differences Β· 4 level
P/T Manager versus HydroTech Pocket Engineer: the parameters behind the verdict, then further details
ParameterP/T ManagerHydroTech Pocket Engineer
PriceFreeFree
Update frequencyEvery 4 monthsMonthly β€” better
AdsNoNo
In-app purchasesYesNo β€” better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details β€” not scored
Size1 MB3 MB
Age rating4+17+
DeveloperAeronautical Data Systems Inc.michael schricker

In-app purchases

1 purchases

P/T Manager

Subscriptions1
  • Free 30 days trial1 Month trial$3.991 Year
None

HydroTech Pocket Engineer

No in-app purchases

Questions

Is P/T Manager free?
P/T Manager is free to download, with in-app purchases available.
Is HydroTech Pocket Engineer free?
HydroTech Pocket Engineer is free to download, with no in-app purchases.
Do P/T Manager or HydroTech Pocket Engineer have ads?
Neither P/T Manager nor HydroTech Pocket Engineer shows ads.
Which is updated more often, P/T Manager or HydroTech Pocket Engineer?
P/T Manager ships an update every 4 months, and HydroTech Pocket Engineer monthly. Most recently, P/T Manager was updated on October 5, 2026 and HydroTech Pocket Engineer on October 1, 2026.

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