Slab — Support

Need help with Slab — the concrete & masonry material estimator? We’re happy to help.

Contact us

Email: jonghyuk.park1105@gmail.com — we usually reply within 1–2 business days.

Quick answers

• Paid once, everything included: Slab is a paid app. Every material, dollar cost quotes, saved projects and PDF/text export are included. There is no in-app purchase and no subscription.
• New iPhone or reinstall: download Slab again from the App Store with the same Apple ID; you are not charged twice. Your projects stay on the device where you created them.
• Works offline: Slab needs no account and no internet — it runs fully in airplane mode.
• Units: type feet-inch-fractions like 12' 6 1/2" or switch to metric in the calculator; set the default units in Settings.
• Accuracy: bag counts always round up to full bags; material yields follow published Quikrete / Sakrete and CRSI values.

Thanks for using Slab.