# GrainPoint Psychrometric Calc — Dew point, grains & drying > Dew point, grains & drying (iPhone/iPad app by Yaniv van der Stigchel.) - Source: https://appshunter.io/ios/app/grainpoint-psychrometric-calc/id6814971905 (this page in markdown: same URL + `.md`) - Developer: [Yaniv van der Stigchel](https://appshunter.io/developer/6791340700) - Category: Utilities, Productivity - Price: $4.99 - Age rating: 4+ - Requires: iOS 17.0 · 5 MB - Languages: American English, Dutch, German (Germany), Italian, Brazilian Portuguese - Released: 2026-09-24 - Data updated: 2026-10-13 ## What is GrainPoint Psychrometric Calc? It is 7am, the building is wet, and the only question is whether to open the windows. GrainPoint answers that one. Type the inside reading and the outside reading. GrainPoint compares them on GRAINS — the actual weight of water each holds — and tells you whether ventilating would dry the place out or make the job longer. THE MISTAKE IT EXISTS TO PREVENT Outside at 85°F and 50% has a lower relative humidity than inside at 75°F and 60%. It feels drier. It is not drier: it holds about twelve more grains per pound. Open the windows on that and you have just pumped water into a building you are trying to dry. GrainPoint names that case out loud when it happens, because every instinct says the opposite. It also refuses to decide when the two readings are within a few grains of each other. A field hygrometer is commonly ±3% RH, and pretending a two-grain difference is a decision would be false precision. READ ACROSS, BOTH STATES AT ONCE Dry bulb, wet bulb, dew point, dew point depression, relative humidity, humidity ratio, enthalpy, specific volume and vapour pressure — for inside and outside side by side, which is how you actually use them. Everything comes from the ASHRAE Fundamentals formulation, the same correlations the printed psychrometric chart is a plot of, computed directly rather than interpolated off a digitised chart. Separate saturation correlations over ice and over water, so a February job is right too. CORRECTED FOR THE JOB Humidity ratio is water per pound of DRY air, and thin air weighs less. At the same temperature and humidity, a job a mile up carries more grains than one at sea level. Set the altitude and every number accounts for it — barometric pressure, not an assumption. DRYING TARGETS Four published chamber targets in grains, from an aggressive first-day differential to an occupied-comfort band, with a line on each saying what it is for. Set one and the app tells you when the chamber has reached it. Fahrenheit and grains per pound, or Celsius and grams per kilogram. Switch any time. WHAT IT IS NOT It describes the air, not the material. It does not read moisture content in wood or drywall, size a dehumidifier, assess mould, or replace metering the material itself. The ventilate-or-dehumidify verdict compares two readings you took — it does not know what the weather will do next. The app says all of this on its own Reference screen. One payment. No subscription, no account, no ads, and no network connection anywhere in it — which matters in a basement with no bars. ## Is GrainPoint Psychrometric Calc safe? Not enough ratings yet to assess GrainPoint Psychrometric Calc. ## Is GrainPoint Psychrometric Calc legit? GrainPoint Psychrometric Calc appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for GrainPoint Psychrometric Calc is 65 out of 100 points across 7 verification signals from App Store and developer data. ## Version history (last 3 releases) ### 1.1 — 2026-10-07 Drying log per job: log each visit and see how many grains are left to target, or the day it was reached, on a chart. One-page drying log PDF to share with the adjuster or the job file. Dehumidifier check: enter the exhaust reading and see how many gr/lb it is pulling. Clearer verdict with the deciding number and a grain scale with your target. Fixed: your last reading now comes back after a relaunch. ### 1.0.1 — 2026-09-28 New app icon. Small fixes and polish. ### 1.0 — 2026-09-24 No release notes. ## More apps by Yaniv van der Stigchel - [Every Angle](https://appshunter.io/ios/app/every-angle/id6791340698) - [evnt: venue agenda tracker](https://appshunter.io/ios/app/evnt-venue-agenda-tracker/id6792543254) - [DAF Speech Jammer & Fluency](https://appshunter.io/ios/app/daf-speech-jammer-and-fluency/id6809582675) - [SpeedFeed Machinist Calculator](https://appshunter.io/ios/app/speedfeed-machinist-calculator/id6809584773) - [Gift Tracker: Christmas List](https://appshunter.io/ios/app/gift-tracker-christmas-list/id6809765243) - [DuctWise HVAC Duct Calculator](https://appshunter.io/ios/app/ductwise-hvac-duct-calculator/id6814964642) All apps by Yaniv van der Stigchel: https://appshunter.io/developer/6791340700 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-13.*