TrueFill: Conduit Fill
TrueFill: Conduit Fill is a utility app for electrical professionals that calculates conduit fill and raceway sizes with detailed math traces on iOS.
The App DNA
What makes this app unique?
The app removes the cognitive friction of manual NEC code-compliance checks by providing a transparent, line-by-line breakdown of conductor area and assumptions.
For Qualified electrical professionals and contractors who require code-compliant conduit fill calculations for field work.
What does it look like?
Key features
Calculates smallest passing trade size and fill percentage based on user-inputted conductor counts and raceway types.
Provides a line-by-line breakdown of conductor area, assumptions, and NEC source references for every calculation.
Allows users to save and reopen specific calculation revisions for later reference.
How much does it cost?
The app is provided as a free calculation aid to support the developer's primary business as a licensed electrical contractor.
Velocity
Maintenance developmentUX improvementsShow more...
TrueFill: Conduit Fill currently operates at a maintenance cadence, with only one release shipped in the last 82 days. Development is focused on UX improvements, specifically targeting field usability through a high-contrast dark theme and refined navigation. The latest version maintains the core deterministic math engine while modernizing the visual interface. Given the current release frequency, the app is in a stable maintenance phase rather than active development.
Who built it?
User Sentiment
What do users think recently?
How are ratings & reviews evolving?
Not enough recent reviews to extract reliable themes yet.
Read the full review analysisCompetition
Competitive landscape for TrueFill: Conduit Fill
How's the Utilities market?
TrueFill: Conduit Fill operates as a specialized utility in the Utilities category, focusing on technical transparency rather than mass-market scale. The free-to-use model acts as a brand-authority mechanism for 509 Electric, differentiating it from paid engineering software.
Read the market outlookThe rivals identified
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Access the full report for freeThe Analyst's Read
Key takeaways for TrueFill: Conduit Fill
Where is it heading?
The electrical utility market is consolidating around tools that offer both speed and verifiable code-compliance. TrueFill: Conduit Fill is well-positioned to defend its niche if it maintains its focus on transparency, but the current update velocity suggests the developer is prioritizing other business lines over feature expansion.
- The latest release introduced a high-contrast dark theme, but the 83-day update gap suggests a shift toward maintenance-only status.
- Focusing on math-trace transparency creates a defensible technical authority that generic calculators cannot replicate, securing the app's niche position.
The SWOT
- Math-trace transparency establishes technical authority for 509 Electric.
- Mobile-first design optimizes field-ready workflow.
- Offline-first export functionality would increase utility in low-connectivity field environments.
- Expanding templates to include more complex raceway configurations would increase habitual use.
Next best moves
Ship offline-first export functionality because field work often occurs in low-connectivity areas → increase utility
+ 1 more prioritized moveThe counter-intuitive read
The lack of monetization is not a weakness but a deliberate brand-moat strategy…
Read the full takeBottom line
TrueFill: Conduit Fill successfully uses technical transparency to build professional trust, but the current maintenance-mode cadence limits its ability to capture more of the field-utility market. Prioritizing offline-first export would unlock higher utility for the core professional audience.
Unlock 2 critical frictions, 2 market threats, 1 more prioritized move and the analyst’s take.
Access the full report for freeFAQ
Is TrueFill: Conduit Fill suitable for final project bids?
How does TrueFill: Conduit Fill differ from standard calculators?
Is TrueFill: Conduit Fill safe for professional electrical work?
Sources
- [1] App Store
- [2] Developer website, source
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