Report updated Jun 22, 2026
Rebar Grid Calculator
For construction professionals and DIY builders requiring precise material estimates for concrete slab reinforcement.
Rebar Grid Calculator is an established business app that is a paid app. With a 4.7/5 rating from 13 reviews, it shows polarized user reception.
What is Rebar Grid Calculator?
Rebar Grid Calculator is a construction utility for estimating rebar requirements on concrete slabs, available as a paid app on iOS.
Users hire this app to automate material estimation for concrete projects, replacing manual calculations with a digital tool that supports both imperial and metric units.
Current Momentum
v1.0
- No updates since Feb 2021.
What makes this app unique?
What Does It Look Like?
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What Are The Key Features?
Calculates required rebar quantity based on slab dimensions, edge spacing, and grid spacing.
Supports input and output in both imperial and metric units.
Exports calculated grid requirements via text or email.
How much does it cost?
- Single purchase at $1.99 USD
Paid model at $1.99 USD per download, targeting professional and DIY construction users with a one-time utility fee.
Who Built It?
H3 Apps
Providing specialized utility calculators and interactive social tools for niche professional and recreational needs.
Portfolio
13
Apps
What other apps does H3 Apps make?
Explore the full H3 Apps report
Portfolio breakdown, audience, momentum, and every app published by H3 Apps.
What do users think recently?
Analysis in progress, available soon
View the full user-sentiment analysis
Mood gauge, ratings & review-volume history, every praise / complaint / request, and sentiment over time.
What is the competitive landscape for Rebar Grid Calculator?
Where is it available?
Localized markets (1)
How's The Business Market?
How does it evolve in the Business market?
Rebar Grid Calculator holds the #78 Paid position in the US construction category. The lack of updates since Feb 2021 relative to active competitors signals a maintenance-mode posture that risks long-term professional relevance.
Rank progression
3 active rankings tracked — 30-day window
Which niche is Rebar Grid Calculator in?
to calculate rebar requirements for concrete slabs
Explore the full Construction Estimation Calculators niche
Every app in this space — 5 tracked, the niche's live rankings, and Marlvel's editorial take on the job-to-be-done.
The rivals identified
Nemeses(1)
This app occupies the exact same niche as the target, offering a specialized toolset for rebar reinforcement calculations with a significantly larger user base.
Differentiators
- Provides a dedicated, single-purpose interface for rebar reinforcement that minimizes user cognitive load during site work.
- Maintains a high-frequency update cycle to ensure compatibility with the latest iOS hardware and OS standards.
- Focuses exclusively on the construction professional's workflow rather than general-purpose business or utility calculations.
Head to head
The target app must emphasize its superior UI/UX and dual-unit flexibility to differentiate itself from this established, reliable incumbent.
Contenders(1)
A highly established utility that covers rebar estimation as part of a broader, professional-grade construction calculator suite.
Differentiators
- Integrates rebar estimation within a comprehensive suite of construction-specific math tools for complex project management.
- Benefits from a long-standing brand reputation in the construction industry, creating a high barrier to entry.
Same space(2)
A high-volume general utility app that competes for the same 'calculator' search intent despite lacking specialized construction features.
Differentiators
- Offers a broad, general-purpose calculation interface that lacks the specialized input fields required for rebar grid layout.
- Competes on sheer volume and brand visibility rather than specific domain-expert functionality for construction professionals.
A long-running utility app that serves the construction industry, though it covers a much wider scope than simple rebar grids.
Differentiators
- Provides a vast library of construction formulas that extend far beyond the target app's specific rebar focus.
- Maintains a very long release history, suggesting a stable and mature codebase for professional construction users.
Compare Rebar Grid Calculator against every rival
All rivals in one side-by-side table — identity, store metrics, ratings & sentiment, and strategic intel — plus a head-to-head page for each.
The outtake for Rebar Grid Calculator
Strengths to defend, gaps to attack
Core Strengths
- Unified calculation flow supports imperial and metric units in one interface.
- Result sharing via text or email integrates into professional project workflows.
Critical Frictions
- No updates since Feb 2021 creates professional reliability concerns.
- Single-purpose utility lacks the formula depth of suite-based competitors.
Growth Levers
- Add advanced slab reinforcement formulas to compete with broader construction suites.
- Implement cloud-sync for project estimates to increase professional lock-in.
Market Threats
- High-frequency update cycles from Rebar Calc erode professional trust in this codebase.
- Multi-tool suites capture the same user segment with higher value-per-download.
What are the next best moves?
Ship compatibility update because the app has not been updated since Feb 2021 → restore professional trust.
The app has not been updated since Feb 2021, which is a major red flag for professional users.
Trade-off: Pause new feature development — reliability is the primary barrier to professional adoption.
A counter-intuitive read
The app's narrow focus is not a weakness but a potential moat, provided the developer pivots to a high-frequency update cadence that outpaces the feature-bloat of suite-based competitors.
Feature Gaps vs Competitors
- Comprehensive construction formula library (available in BuildCalc but absent here)
- Multi-tool suite integration (available in Material Estimator Calculator but absent here)
Key Takeaways
The app provides a clean, specialized utility for slab reinforcement, but its lack of updates since 2021 makes it a risky choice for professional users, so the PM must prioritize a maintenance refresh to restore trust.
Where Is It Heading?
Declining
The construction utility market is consolidating around suite-based tools that offer broader formula libraries and consistent OS compatibility. Rebar Grid Calculator remains exposed due to its stagnant release cadence, so revenue growth will likely stall unless the developer commits to a modern update cycle.
The lack of updates since Feb 2021 signals a maintenance-mode posture, which erodes professional trust and invites churn to more active competitors.