ClearCalcs Alternative — Free Structural Steel Design

At $79/mo for the Essentials plan and $149/mo for the Professional suite, ClearCalcs locks structural steel design behind a subscription paywall — with only a 14-day trial before the credit card gate drops. SteelCalculator takes the opposite approach: a permanent free tier with 5 calculations per day, covering AISC 360, EN 1993, AS 4100, and CSA S16 through an 8-stage guided pipeline. No trial expiration, no forced upgrade, no credit card required — ever.

This free model is sustainable because SteelCalculator runs its 2D Direct Stiffness Method solver as client-side WebAssembly (WASM). Rather than paying for cloud infrastructure to process every analysis, the computation happens on your device. This keeps operating costs near zero and eliminates the privacy concerns that come with uploading structural models to third-party servers. For engineers who need occasional steel design checks — a beam size here, a column verification there — SteelCalculator removes the monthly subscription barrier entirely.

PRELIMINARY — NOT FOR CONSTRUCTION. All calculations are for educational and preliminary design use only. Final designs must be independently verified by a licensed Professional Engineer (PE) or Structural Engineer (SE) before use in any project.

Feature Comparison — SteelCalculator vs ClearCalcs

Pricing Comparison

SteelCalculator's free tier advantage: ClearCalcs offers only a 14-day free trial — after that, you must subscribe at $79/mo minimum to continue using the platform. SteelCalculator's free tier is permanent: 5 calculations per day, with full access to all 4 design codes and the complete 8-stage pipeline. No credit card, no trial expiration, no forced upgrade. For engineers who need occasional steel design checks without a monthly subscription commitment, SteelCalculator provides a genuine zero-cost option.

Technical Architecture — Client-Side WASM vs Cloud-Based Processing

The most significant architectural difference between SteelCalculator and ClearCalcs is where the computation happens and what that means for privacy, speed, and cost.

SteelCalculator: Client-Side WebAssembly

SteelCalculator's Rust calculation engine compiles to WebAssembly and runs directly in your browser. The architecture is:

1. Geometry input — browser-based 3D viewer with section placement
2. Section properties — client-side catalog lookup from bundled JSON database
3. Load generation — WASM computes wind, snow, seismic, and dead/live loads per code
4. Load combinations — WASM generates factored combinations per ASCE 7, EN 1990, AS/NZS 1170, or NBCC
5. FEA analysis — WASM runs a full 2D Direct Stiffness Method solver (1,224-line engine)
6. Member design — WASM checks flexure, shear, compression, LTB, and combined actions
7. Connection design — WASM designs bolted and welded connections with code-specific checks
8. Results — interactive results with pass/fail status, utilization ratios, and detailed intermediate values

Benefits: All computation happens on your device, so your structural models are never uploaded to third-party servers — a meaningful privacy advantage over cloud-based platforms. Recalculation after parameter changes is instant with no network round-trip. The tool works offline after the initial engine cache (~2-4 MB), and because there are no per-calculation cloud compute bills, SteelCalculator can maintain a genuinely permanent free tier rather than a time-limited trial.

Limitations: 2D frame analysis only (no 3D FEA). Limited to structural steel (no concrete or timber). No project management dashboard. No branded calculation reports for client submissions.

ClearCalcs: Cloud-Based Processing

ClearCalcs processes calculations on their cloud servers. You input parameters through a web interface, the server runs the analysis, and results are returned to your browser.

Benefits: Broader material support (steel, concrete, timber). Calculation reports with company branding for client submissions. Project management dashboard with calculation history. Larger section libraries across multiple regions.

Limitations: Requires internet connection for all calculations. Server latency on each solve. Design data uploaded to third-party servers. No permanent free tier — 14-day trial only, then $79/mo minimum. Higher cost for occasional or low-volume users.

Which Architecture is Right for You?

Free Tier Deep Dive

What SteelCalculator Free Includes

• All 4 design codes: AISC 360-22, EN 1993-1-1, AS 4100:2020, CSA S16:24 — no code restrictions on the free tier. Switch between codes for comparison without upgrading.
• Complete 8-stage pipeline: From geometry through to results with intermediate checkpoint validation. Every stage is available.
• No credit card: Start calculating immediately. No trial countdown. No automatic billing after expiration. Use it for as long as you need.
• Rate limit only: 5 calculations per day. The daily limit resets at UTC 00:00.
• Section library: Full AISC shapes database, ArcelorMittal European sections, and Australian ASI sections.
• Calculation trace: See intermediate values and formulas at each pipeline stage, not just final pass/fail results.

What ClearCalcs Offers (and Costs)

• 14-day free trial: Full platform access for 14 days, then requires a paid subscription. Credit card required to start the trial.
• Essentials plan ($79/mo): Basic steel, concrete, and timber modules. Limited to essential calculation types.
• Professional plan ($149/mo): Full module access, branded reports, priority support.
• Business plan (custom pricing): Multi-user accounts, admin controls, dedicated support.
• No permanent free option: Once the trial expires, all access is blocked until a subscription is active. There is no way to use ClearCalcs for free on an ongoing basis.

When to Choose Each Platform

Choose SteelCalculator (free) when:

• You need quick steel member or connection checks without a monthly subscription
• You work across multiple design codes and want free cross-code comparison
• Data privacy matters — your designs stay on your device
• You work in the field or on sites with unreliable internet
• You are a student or early-career engineer learning steel design
• You need a guided workflow that ensures you do not skip limit states
• Budget is a concern — you cannot justify $79+/mo for occasional use

Choose ClearCalcs when:

• You need concrete or timber design alongside structural steel
• Your firm requires branded calculation reports for client submissions
• You want a project management dashboard to track calculation history
• You need BS 5950 (UK) steel design code support
• Budget allows $79-149/mo for a multi-material design platform
• Your workflow benefits from cloud-based collaboration and calculation storage

Design Code Coverage

SteelCalculator's code coverage is focused and deep for structural steel:

ClearCalcs adds BS 5950 for steel design and extends to concrete (ACI 318) and timber (NDS). For structural steel engineers working internationally, both platforms cover the four dominant design frameworks. SteelCalculator differentiates with its guided 8-stage pipeline wizard — a feature ClearCalcs does not offer — which walks engineers through each design stage sequentially and ensures no limit state checks are missed.

What SteelCalculator Does NOT Do (and Should Not)

To be transparent about limitations — SteelCalculator is not a full ClearCalcs replacement for every use case:

• No concrete design: Steel only. No ACI 318, no AS 3600, no EN 1992.
• No timber design: Steel only. No NDS, no AS 1720.1, no EN 1995.
• No 3D FEA: Analysis is limited to 2D planar frames. No space frames, no plate bending, no shell elements.
• No dynamic analysis: No modal analysis, response spectrum, or time history. Wind and seismic loads are applied as equivalent static forces.
• No branded reports: PDF exports (Pro tier) are basic calculation summaries. No company logo, no custom headers, no professional report formatting for client submissions.
• No project dashboard: No calculation history browser, no project organization, no multi-file management.
• No API: All interaction is through the browser UI. No programmatic access for automation or scripting.
• No BS 5950 support: No British Standard steel design code. UK engineers requiring BS 5950 should consider ClearCalcs or SkyCiv.

These limitations are intentional. SteelCalculator focuses on doing one thing well — structural steel member and connection design across four major codes — rather than being a general-purpose multi-material structural design platform with project management features.

Pricing Deep Dive: The Real Cost of ClearCalcs

For engineers and firms evaluating both platforms, the cost difference is substantial:

ClearCalcs' pricing is per-user. A small engineering firm with three engineers on the Professional plan pays $447/mo ($5,364/yr). Three engineers on SteelCalculator Pro Plus pay $104.97/mo ($1,259.64/yr) — an annual saving of over $4,100. For steel-only design work, this cost difference is significant without sacrificing code coverage.

Important caveat: ClearCalcs' higher price reflects its broader material support (concrete, timber), branded reporting, and project management features. If your work requires these capabilities, the ClearCalcs subscription may be justified. The comparison is most favorable to SteelCalculator for engineers whose work is predominantly or exclusively structural steel.

Getting Started with SteelCalculator

1. Visit steelcalculator.app — no sign-up, no download, no credit card
2. Select your design code from the region picker (AISC 360, EN 1993, AS 4100, or CSA S16)
3. Use the free beam calculator for single-member checks, or start a full pipeline from the Designer Hub
4. Enter geometry and section properties, or select from the built-in section library
5. The WASM engine computes loads, combinations, analysis, and design checks
6. Review utilization ratios, intermediate calculation trace, and export results (Pro tier)

For engineers transitioning from ClearCalcs: SteelCalculator uses the same underlying design code provisions. A 310UB40.4 checked per AS 4100:2020 in SteelCalculator uses the identical alpha_b (member section constant) from Table 5.6.2, phi=0.90 capacity factor, and Clause 5.2.2 member capacity check as the same member in ClearCalcs. The difference is delivery — instant, local, and free vs. cloud-processed under a $79+/mo subscription.

Frequently Asked Questions

Is SteelCalculator accurate compared to ClearCalcs?

Both platforms implement the same design code provisions. SteelCalculator's Rust WASM engine applies identical formulas to those in the published standards (AISC 360, EN 1993, AS 4100, CSA S16). The 2D Direct Stiffness Method solver produces frame analysis results consistent with textbook solutions and commercial software for planar frames. However, SteelCalculator's analysis is limited to 2D — it cannot capture 3D effects like torsional warping of open sections or bi-axial bending from out-of-plane loads. ClearCalcs' cloud-based solver handles a broader range of structural configurations.

Can I trust SteelCalculator for professional design work?

All results are marked PRELIMINARY — NOT FOR CONSTRUCTION. SteelCalculator is an educational and preliminary design tool. While the underlying engineering formulas are correct, the software has not undergone independent verification and validation to the level required for production structural engineering software. Professional designs must be independently verified by a licensed engineer using validated software appropriate for the jurisdiction and project type.

Why is ClearCalcs more expensive than SteelCalculator?

ClearCalcs' higher pricing ($79-149/mo) reflects its broader scope: it is a multi-material platform (steel, concrete, timber), offers branded calculation reports suitable for client submissions, and includes a project management dashboard for organizing multiple calculations. The cloud infrastructure, broader development scope, and commercial support model require higher subscription fees. SteelCalculator's narrower steel-only focus, client-side WASM architecture, and absence of branded reporting and project management features allow it to operate at a much lower cost — including a permanent free tier.

Does SteelCalculator support Australian standards?

Yes. SteelCalculator fully supports AS 4100:2020 for steel design with AS/NZS 1170 load combinations — the same Australian standard ClearCalcs uses (ClearCalcs was originally developed by Australian engineers and has strong AS 4100 support). Australian engineers can use SteelCalculator's free tier for AS 4100 member and connection checks with zero cost. The Australian section library (ASI sections) is included.

How does the 8-stage pipeline wizard work?

The pipeline wizard guides you sequentially through: (1) Building Geometry — define your frame layout and member positions, (2) Section Properties — select from the catalog or enter custom properties, (3) Load Generation — the WASM engine computes wind, snow, seismic, dead, and live loads per your selected code, (4) Load Combinations — factored combinations are auto-generated per ASCE 7, EN 1990, AS/NZS 1170, or NBCC, (5) FEA Analysis — a 2D Direct Stiffness Method solver computes member forces and deflections, (6) Member Design — each member is checked for all applicable limit states, (7) Connection Design — bolted and welded connections are designed per code, and (8) Results — interactive results with pass/fail status, utilization ratios, and detailed calculation trace. Each stage validates intermediate results via server checkpoints, ensuring calculation integrity. ClearCalcs uses a module-based approach without a guided sequential pipeline.

Will SteelCalculator ever support concrete or timber design?

Per the current product roadmap, SteelCalculator is focused exclusively on structural steel. Expansion to concrete or timber would require new calculation engines, material databases, and design code implementations comparable in scope to the existing steel pipeline. There are no immediate plans for multi-material support.

This page is for educational and informational purposes. SteelCalculator is a preliminary design tool — all results must be independently verified by a licensed Professional Engineer (PE) or Structural Engineer (SE) before use in any construction project. ClearCalcs is a trademark of ClearCalcs Pty Ltd. SteelCalculator is not affiliated with, endorsed by, or connected to ClearCalcs Pty Ltd. Feature and pricing comparisons are based on publicly available information as of May 2026 and may change.

Disclaimer: This content is for educational purposes only. Results must be verified by a licensed professional engineer. Steel Calculator provides preliminary design tools — NOT a substitute for professional engineering judgment.