# BendBook - bending calculator

> Sheet-metal bending calculator: DXF, K-factor, nesting, weight calc

Canonical page: [https://chrome-stats.com/d/com.blackbox.bendbook](https://chrome-stats.com/d/com.blackbox.bendbook)

## Overview

- **ID:** `com.blackbox.bendbook`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** BlackBox Design Lab
- **Category:** TOOLS
- **Version:** 1.2.4
- **Last updated:** 2026-09-06
- **First published:** 2026-09-06
- **Publisher country:** UA
- **Size:** 11 MB
- **Data as of:** 2026-09-09
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.blackbox.bendbook)
- **Privacy policy:** [https://blackboxdesignlab.github.io/bendbook/privacy.html](https://blackboxdesignlab.github.io/bendbook/privacy.html)

## Description

BendBook is an engineering calculator for sheet-metal work: bend allowance, DXF export, sheet and bar stock nesting, and a project library - all fully offline, with no internet connection, ads, or data collection required.<br><br>WHAT IT DOES:<br>Bend Allowance &amp; Springback<br>• Calculate bend allowance and bend deduction using any K-factor or bend-allowance method<br>• Predict bend radius and tonnage from material thickness, type, and V-die opening<br>• Measure K-factor - enter results from your own test bends and get a real K-factor for your material and press, instead of relying on a generic table<br><br>Drawings &amp; Export:<br>• Build a flat-pattern layout with cutouts and features<br>• Export to DXF, PDF, or PNG with dimensions in place - ready for CNC and the shop floor<br>• 3D fold preview along bend lines before you commit<br><br>Material Nesting:<br>• Optimize sheet and bar stock layout against available blanks<br>• Per-part cycle time and cost estimate (Quote panel)<br><br>Shop Organization<br>• Project, part, and tooling (punch/die) library that persists between sessions<br>• Built-in calculator (arithmetic, fractions, arcs, unit conversion) and a part-weight calculator, both opening as floating windows without leaving your current screen<br>• PIN lock and a trash bin with undo<br><br>Built for engineers, programmers, and fabricators who calculate bends every day and need an exact answer immediately, without an internet connection or extra steps.

## Rankings

- #3,209,703 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.INTERNET`
- `android.permission.POST_NOTIFICATIONS`
- `android.permission.RECEIVE_BOOT_COMPLETED`
- `android.permission.SCHEDULE_EXACT_ALARM`
- `android.permission.VIBRATE`
- `android.permission.WAKE_LOCK`
- `com.android.vending.BILLING`
- `com.android.vending.CHECK_LICENSE`
- `com.blackbox.bendbook.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.blackbox.bendbook)