# Lien - Trades Calculator

> Electrical / Plumbing / HVAC

Canonical page: [https://chrome-stats.com/d/id6772546653](https://chrome-stats.com/d/id6772546653)

## Overview

- **ID:** `id6772546653`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Mitaanshu Agarwal
- **Category:** Utilities
- **Version:** 1.0
- **Last updated:** 2026-06-03
- **First published:** 2026-06-02
- **Size:** 4.28 MB
- **Data as of:** 2026-09-23
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/lien-trades-calculator/id6772546653)
- **Website:** [https://lien.uptrail.ai](https://lien.uptrail.ai/)
- **Privacy policy:** [https://lien.uptrail.ai/privacy](https://lien.uptrail.ai/privacy)

## Description

18 trade calculators — electrical, plumbing, HVAC, carpentry. Offline, with projects + PDF export.

Every trade calculation. One app. Forever offline.

Lien bundles the everyday calcs that electricians, plumbers, HVAC techs, and carpenters reach for on the truck — in a clean, fast iOS app that works without signal.

WHAT'S INSIDE (18 calculators)
- Electrical (6): wire size, voltage drop, conduit fill, box fill, motor FLA, service load.
- Plumbing (4): friction loss, fixture units, drain size, water-heater sizing.
- HVAC (4): BTU sizing, duct size, SEER cost, composite R-value.
- Carpentry (4): cut list, beam span, rafter, stairs.

MORE THAN A CALCULATOR
- Save calculations and group them into named Projects, then export a clean PDF for the inspector or the client.
- Reference tables bundled offline: NEC ampacity, conduit fill, pipe sizing, R-values, fastener guide.
- Pick your code region (US NEC, UK BS 7671, AU/NZ AS 3000); tables and formulas calibrate to it.
- 100% on-device. No accounts, no cloud, no data sync. Built dark-mode-first for job-site readability.

FREE TIER
- The full Electrical trade (6 calculators) and up to 3 saved calculations — free, forever.

LIEN PRO (auto-renewing subscription)
- Unlocks all 4 trades (18 calculators), unlimited saved calculations, and Projects with PDF export.
- $9.99/month or $59.99/year (about 3 months free on the yearly plan).
- Payment is charged to your Apple Account at purchase confirmation. The subscription renews automatically for the same price and period unless you turn off auto-renew at least 24 hours before the end of the current period. Manage or cancel anytime in Settings > Apple Account > Subscriptions.

DISCLAIMER
Lien is a calculator. Always verify results against the current local code in force (NEC, IPC, IMC, IBC, or the regional equivalent). Lien is not a licensing or certification authority.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://lien.uptrail.ai/privacy

## Rankings

- #1,796,135 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6772546653)