# Lien - Trades Calculator — Electrical / Plumbing / HVAC

> Electrical / Plumbing / HVAC (iPhone/iPad app by Mitaanshu Agarwal.)

- Source: https://appshunter.io/ios/app/lien-trades-calculator/id6772546653 (this page in markdown: same URL + `.md`)
- Developer: [Mitaanshu Agarwal](https://appshunter.io/developer/1896724075)
- Category: Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 18.0 · 4 MB
- Languages: American English
- Released: 2026-06-02
- Data updated: 2026-07-28
- User reviews in markdown: https://appshunter.io/ios/app/lien-trades-calculator/id6772546653/reviews.md

## What is Lien?

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

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Lien - Trades Calculator Pro Yearly | $59.99 | per year |
| LienTradesCalculatorMonthly | $9.99 | per month |



## Version history (last 1 release)

### 1.0 — 2026-06-03

No release notes.

## More apps by Mitaanshu Agarwal

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- [HeadshotKit: AI Headshots](https://appshunter.io/ios/app/headshotkit-ai-headshots/id6771369579)

All apps by Mitaanshu Agarwal: https://appshunter.io/developer/1896724075

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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 2026-07-28.*