Blast: Pressure Washer Calc
PSI, nozzles & soap, cited
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
The right PSI for every surface, the right nozzle for your washer, and honest never-wash verdicts — CAT Pumps, Consumer Reports & CPSC cited. Pay once. No subscription.
Pay once. No subscription, no ads, no account. Works offline.
Blast is the pressure-washer reference. Know the PSI each surface actually takes before you etch the driveway or strip the deck, pick the right tip, get the exact nozzle number your washer needs, and mix detergent without gas-station math — every figure cited to its source.
Free forever
• Surface guide — Consumer Reports pressure bands: decks 800–1,000 PSI, siding 1,200–1,500, concrete 1,500–3,000, and the honest never-wash list (roofs, and yes, cars — CR says paint nicks invite rust; foam or hand-wash instead)
• Nozzle colors — what red 0° (avoid it), yellow 15°, green 25°, white 40°, and the black soap tip are each for
• Wash Safe — CPSC-cited rules: an injection wound is a surgical emergency, GFCI for electric units, never run gas units in a garage; never spray from a ladder (CR)
Blast Pro — one-time unlock
• Nozzle size — your washer's rated PSI and GPM become the nozzle number to buy, by the CAT Pumps selection formula, plus your cleaning units (PSI × GPM)
• Soap & dilution — the label's ratio becomes ounces per gallon and a total for your mix tank
For homeowners with a driveway, a deck, siding, and a pressure washer that came with five mystery tips.
$6.99 one-time for Blast Pro. No subscription, no ads, no account.
Privacy: Blast collects nothing. No analytics, no accounts, no cloud.
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The developer, Roman Kopaliani, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
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Information
- Seller
- Roman Kopaliani
- Size
- 857.1 KB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Blast Pro $6.99
- Copyright
- © 2026 Roman Kopaliani