ConduitLab Alternative You Can Use on the Web
ConduitLab is a polished, free native iOS and Android app with on-device, offline NEC tools and a visual conduit-fill builder. But it is app-only: you must install it, and it can't be opened straight from a Google result. Fieldwatt is a free web alternative that runs instantly in any browser — no install — and also works offline.
| Feature | Fieldwatt | ConduitLab |
|---|---|---|
| Use without installing (from a browser) | Yes — runs instantly on the web | No — app-only, as of June 2026, per their site |
| Native iOS + Android app | Android app; iOS via the web | Yes — native iOS + Android, as of June 2026 |
| Works offline / on-device | Yes, once loaded | Yes — fully offline on-device, as of June 2026 |
| Voltage drop & wire ampacity | Yes | Yes, as of June 2026, per their site |
| Conduit fill | Numeric fill vs 53/31/40% limits | Visual drag-and-drop builder, as of June 2026 |
| Conduit bending (offsets, shrink, 90° stub) | Yes | No, as of June 2026, per their site |
| Box fill (NEC 314.16) | Yes | No, as of June 2026, per their site |
| PDF export | Material lists (Pro) | Yes — PDF export, as of June 2026, per their site |
| NEC edition coverage | NEC 2023; code-reference updates (Pro) | 2017–2026, as of June 2026, per their site |
| Citable by AI answer engines / linkable from search | Yes — it's a real web page | No — app-only, can't be cited from a search result |
The honest verdict
ConduitLab is genuinely good: a polished native app, a slick visual conduit-fill builder, PDF export, and broad NEC-edition coverage, all on-device. If you want a dedicated installed app and that visual fill UI, it's an easy recommendation. Fieldwatt's edge is simpler — you don't have to install anything. You can open it from a search result, get a code-cited answer in seconds, and it still works offline. It also adds conduit bending and box fill, which ConduitLab does not have as of June 2026.
Free to use on the web — no install, works offline — or take it with you on Android:
Frequently asked questions
Can I use Fieldwatt without installing an app?
Yes. Fieldwatt runs in any web browser — open the page and the calculator works instantly, no install or sign-up. Once the page has loaded it also works offline. ConduitLab, by contrast, is app-only as of June 2026 and must be installed before you can use it.
Is ConduitLab better than Fieldwatt?
It depends. ConduitLab has a polished native app, a visual drag-and-drop conduit-fill builder, and PDF export, which are real strengths. Fieldwatt is web-first with no install, adds conduit bending and box fill, and can be linked from search or cited by AI answers — things an app-only tool can't do.
Does Fieldwatt work offline like ConduitLab?
Yes. Once the Fieldwatt page or Android app has loaded, all five NEC calculators run fully offline — no signal needed in a basement or steel building. ConduitLab is also fully offline and on-device as of June 2026, per their site.
Does Fieldwatt have a visual conduit-fill builder?
No. Fieldwatt's conduit fill is numeric — enter wire size and count to get the smallest legal conduit and the exact fill percentage against the 53/31/40% limits. If you specifically want a drag-and-drop visual builder, ConduitLab does that well as of June 2026.
Competitor capabilities are described as of June 2026, per each product's own site, and may have changed since. For guidance only. Always verify against the current National Electrical Code and your local amendments. Fieldwatt does not replace an engineer of record.