# Concrete & Stair Calculator — Construction, drywall, roofing

> Construction trade calculator with 3D results and AI assistant. (iPhone/iPad app by Devolim.)

- Source: https://appshunter.io/ios/app/concrete-and-stair-calculator/id6766280669 (this page in markdown: same URL + `.md`)
- Developer: [Devolim](https://appshunter.io/developer/1823631894)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 42 MB
- Languages: Dutch, German (Germany), Romanian, Swedish, European Spanish, American English, Italian, European Portuguese, Polish, French (France)
- Released: 2026-05-21
- Data updated: 2026-10-28
- Monetization: freemium
- User reviews in markdown: https://appshunter.io/ios/app/concrete-and-stair-calculator/id6766280669/reviews.md

## What is Concrete & Stair Calculator?

Blok is the calculation tool for the modern job site: over 70 trade calculations in your pocket, results drawn in 3D, and Barto, the beaver assistant who answers your job site questions.

Built for masons, concrete finishers, roofers, tile setters, drywallers, electricians, plumbers, painters and serious DIYers.

THE RIGHT NUMBER, FIRST TIME
Pick a trade, enter your measurements: concrete, cement bags, blocks, tile, paint, roof pitch, wire size… The result appears in seconds, with the quantities to order and the points to watch.

THE RESULT IN 3D
Slab, wall, stairs, roof: what you calculate is drawn in 3D, dimensions included, so you can check everything at a glance before you order.

FEET OR METERS, YOUR LOCAL RULES
Work in feet and pounds or in meters and kilos. Bag sizes, voltage, installation rules: Blok adapts to the country you choose.

BARTO, YOUR JOB SITE ASSISTANT (BLOK PRO)
A question about a mix, a slope or a wire size? Barto answers and opens the right calculation, already filled in. He needs an internet connection and can make mistakes: always double-check.

YOUR JOBS, ORGANIZED BY PROJECT
Keep every calculation for a job in one place and find any number in two taps.

THE 10 MODULES
MASONRY: concrete volume (slab, round column, stairs, wall, footing), concrete and mortar mix, cement bags, blocks per area, full slab, screed.
DRYWALL: panels, screws, tape and mud, studs and tracks, R-value, U-factor.
TILING: tile per area, waste, thinset, grout, baseboards, floating floor, vinyl flooring, diagonal layout.
PAINTING: wall and ceiling area, paint quantity, primer, wood finish.
ROOFING: pitch, rafter length, gable or hip roof area, tiles and slate, battens, lumber sizes, gutters and downspouts, underlayment.
ELECTRICAL: Ohm's law, power, wire size, voltage drop, circuit check.
PLUMBING: water heater, pipe size, drain slope, radiator and boiler output, head loss.
EARTHWORK: excavation, swell factor, tonnage, truckloads, drain slope.
GEOMETRY: areas, volumes, Pythagorean theorem and 3-4-5 squaring, trigonometry, proportions.
CONVERSIONS: length, area, volume, weight, temperature, pressure, power, feet and inches, AWG…

NO SIGNAL NEEDED, NO ADS
Calculations work offline, in a basement or out in the middle of nowhere. No account to create. No ads.

FREE OR PRO
The free version gives you 10 credits to start, then 3 more every Monday, up to 10 (one calculation = one credit). Blok Pro unlocks unlimited calculations, Barto, unlimited projects and favorites, and your calculation history. Monthly or yearly subscription: the price is shown before any purchase.

DISCLAIMER
Blok's results are indicative. They do not replace local building codes or the advice of an engineer. For any work that affects safety, consult a qualified professional.

Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel at any time in your Apple Account settings.

Terms of Use: https://blok.devolim.fr/en/legal/terms.html
Privacy: https://blok.devolim.fr/en/legal/privacy.html
Support: contact.blok@devolim.fr

Blok is published by DEVOLIM (BAUGEY MATHEO), a French sole proprietor. SIREN 948 000 757, RCS Bordeaux.

## Key features

- 70+ trade calculations
- 3D result visualizations
- AI job site assistant (Pro)
- Offline calculations
- Project organization
- Unit and rule adaptation

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Blok Pro Monthly | $2.99 | per month |
| Blok Pro Yearly | $17.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Blok Pro Lifetime | $29.99 | one-time |


## Is Concrete & Stair Calculator safe?

Not enough ratings yet to assess Concrete & Stair Calculator.

## Is Concrete & Stair Calculator legit?

Concrete & Stair Calculator appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Concrete & Stair Calculator is 65 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/concrete-and-stair-calculator/id6766280669/reviews.md

### 5/5 — Superbe, application

*2026-10-09*

Je recommande. Merci bien

### 5/5 — au top

*2026-06-04*

nouveau entrepreneur btp, cette app m’a changé la vie

### 5/5 — Bon appli

*2026-06-04*

👍

### 5/5 — Superbe application !

*2026-05-21*

Dans le bâtiment depuis de nombreuses années, je suis stupéfait de l’efficacité de cette application ! 
Elle est vraiment complète et très simple à utiliser. 
Le gain de temps est très appréciable, en quelques secondes le calcul est fait. 
J’ai personnellement opté pour la formule Blok Pro à vie qui est pour la plus rentable. 
Un conseil, foncez, vous ne serez vraiment pas déçu.

## Frequently asked questions about Concrete & Stair Calculator

### What trades does Concrete & Stair Calculator support?

Concrete & Stair Calculator supports over 70 trade calculations across masonry, drywall, tiling, painting, roofing, electrical, plumbing, earthwork, geometry, and conversions. This comprehensive coverage aims to assist a wide range of construction professionals.

### Does Concrete & Stair Calculator work offline?

Yes, Concrete & Stair Calculator works offline, allowing you to perform calculations even without an internet connection. This feature is beneficial for job sites with limited or no signal.

### What is Barto, the AI assistant in Concrete & Stair Calculator?

Barto is an AI job site assistant available in the Pro version of Concrete & Stair Calculator. He can answer job site questions and open relevant calculations, though users are advised to double-check his responses as he can make mistakes.

### How does the free version of Concrete & Stair Calculator work?

The free version of Concrete & Stair Calculator provides 10 starting credits, with 3 additional credits granted each Monday, up to a maximum of 10. Each calculation typically consumes one credit.

### What features are included in Concrete & Stair Calculator Pro?

Concrete & Stair Calculator Pro unlocks unlimited calculations, access to Barto, unlimited projects, favorites, and your calculation history. It is available via monthly or yearly subscription.

### Can I manage my Concrete & Stair Calculator subscription?

Yes, subscriptions for Concrete & Stair Calculator can be managed or canceled at any time through your Apple Account settings. Subscriptions automatically renew unless canceled at least 24 hours before the current period ends.

### Does Concrete & Stair Calculator have ads?

No, Concrete & Stair Calculator is ad-free. The app explicitly states that it contains no advertisements, providing an uninterrupted user experience.

### Is Concrete & Stair Calculator suitable for international use?

Yes, Concrete & Stair Calculator supports both feet and meters, and adapts to local rules for bag sizes, voltage, and installation based on the country selected. This makes it versatile for users worldwide.

## Version history (last 4 releases)

### 2.0.0 — 2026-10-16

Blok 2.0 is here.
- A brand-new design, clearer for everyday work on site.
- Barto, the AI job-site assistant, answers your questions (Blok Pro).
- 3D rendering arrives in the app.
- No more ads.

### 1.2.0 — 2026-07-28

• New, more reliable billing engine
• Explainer screen before the ad tracking request
• Redesigned settings with clearer selectors
• Fixed price display (local currency everywhere)
• Full update of internal components

### 1.1.0 — 2026-06-26

Thanks for using our app! This update brings performance improvements and bug fixes for a smoother, more reliable experience.

### 1.0 — 2026-05-21

No release notes.

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*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 2026-10-28.*