21 phases shipped, 25-phase roadmap

The building model
it should have always been.

Conjunction is a professional BIM platform in your browser. Place walls, analyze energy, run fire calculations, coordinate with your team — without a single plugin or install.

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Conjunction BIM — parametric 3D model visualization

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Working now

Professional BIM, fully in-browser

Everything in this list is live and functional. No betas, no coming soon. It's already yours.

⬡
Parametric 3D Model
Walls, columns, levels, doors, windows. DAG constraint solver propagates every change instantly across plan, section, and 3D views.
⚡
Energy Analysis
NYECC EN-001 through EN-008 compliance. gbXML export, IDF generation, 8,760-hour yearly simulation with animated visualization. NYC DOB EN-1 form auto-fills from your model.
🔥
Fire Protection
NFPA 13 sprinkler hydraulics, NFPA 101 egress analysis, NFPA 92 smoke control, IBC fire resistance. FDS input generation for advanced smoke simulation. FDNY FP-1 form.
🌍
Geotechnical Analysis
Bearing capacity (Terzaghi, Hansen, Meyerhof), elastic and consolidation settlement, lateral earth pressure (Rankine, Coulomb), pile capacity, slope stability. OpenSees .tcl export.
👥
Real-Time Collaboration
Shared viewport via WebRTC peer-to-peer sync. Live presence avatars. Issue pins with camera snapshots and threaded comment threads.
📐
Design Book
A-400 door/window schedules auto-populated from model. Product placeholder system (doors, windows, finishes, HVAC, structural) with approval workflows. Pella and Simpson Strong-Tie catalog integration.
📊
Year Visualization
Animated 8,760-hour energy output playback. Room temperature heatmap on 3D mini-viewport. Monthly heating/cooling bar charts. 24h HVAC load curve. MP4/WebM export.
⚑
Issue Tracker
Pinned issue tickets anchored to model elements. Camera snapshot at creation. Threaded comments. Priority and status. Built for architect-engineer coordination.

Integrations

Works with the tools you already use

Conjunction connects to visualization, rendering, and data tools — export models, sync geometry, and keep your workflow uninterrupted.

VERAS
Finch3D
Motif
Google Drive
Autodesk Forma
Polycam

Export via DXF/DWG, gbXML, IDF, OpenSees .tcl, and JSON. More integrations shipping with each phase.

Equal quality
for everyone —
not just
the firms
that can afford it.

The tools that run the built environment have been gatekept behind licensing fees most small practices can't justify. The result: half the industry uses consumer software for professional work, or goes without analysis entirely.

Conjunction is built on the premise that the quality of your tools shouldn't depend on the size of your firm. A two-person architecture office in Brooklyn deserves the same energy modeling, fire analysis, and coordination capabilities as a firm with a hundred engineers and a six-figure software budget.

The full platform — every module, every analysis engine, every feature — is available to every user. There are no feature tiers. No "professional" upsells. No modules locked behind additional payments.

Conjunction costs $30/month — less than a day of consulting time. Every module included. No seat-based pricing. No feature tiers. A small practice in any borough has the same tools as a firm with a full IT department.

Where we've been

Twenty-one phases live. Four more planned.

Here's the full build history — what shipped, what came next, and what's queued.

Phase 1–3
BIM Foundation
Live
Three.js viewer, parametric walls/columns, multi-level floor system, DAG constraint propagation, real-time constraint solver, plan/section/3D sync.
Phase 4–6
Doors, Windows & Catalog
Live
Revit-style family system — doors and windows placed on wall faces, auto-cut wall geometry, wall/door/window type catalog with width/height/material/fire rating.
Phase 7
A-400 Schedules
Live
Door and window schedules auto-populate from placed families. A-400 format ready for DOB filing. Exportable table view.
Phase 8
Real-Time Collaboration
Live
WebSocket server, live presence avatars, shared viewport rooms via WebRTC peer-to-peer sync, cursor positions, session management.
Phase 9
Issue Tracker
Live
Issue tickets anchored to model elements, camera snapshot at creation, threaded comment threads, priority/status, assignee. Built for architect–engineer coordination.
Phase 10
EN-1 Workbook
Live
Native NYC DOB EN-1 form UI. Auto-fills from BIM model (U-values, WWR, LPD, floor area). Live WWR calculation with ASHRAE 90.1 CZ 4A pass/fail. SheetJS .xlsm export with formula-ready layout.
Phase 11
Anonymous Registration + Matching
Live
UUID anonymous sessions, 3-step magic link signup, skill-based team matching with match scoring, projects with team invites, support ticket system.
Phase 12
AI Rendering
Live
AI-generated renders from any camera viewpoint — photorealistic, watercolor, blueprint, sketch, and night modes. Render gallery with camera data persistence.
Phase 13
Energy Simulation
Live
gbXML export from BIM geometry, IDF generation for EnergyPlus, JS-based ASHRAE simulation engine, EN-001 through EN-008 compliance checks. Heating/cooling load outputs.
Phase 14
Geotechnical + OpenSees
Live
Bearing capacity (Terzaghi/Hansen/Meyerhof), elastic/consolidation settlement, lateral earth pressure (Rankine/Coulomb), pile capacity (Alpha method, t-z/p-y/Q-z curves), slope stability (Fellenius/Bishop). OpenSees .tcl export. Three.js borehole cross-section.
Phase 15
Fire Protection
Live
NFPA 13 sprinkler hydraulics (Hazen-Williams, density-area curves), NFPA 101 egress (occupant load, travel distance, exit widths), NFPA 92 smoke control (stairwell pressurization, fan sizing), IBC fire resistance, FDNY FP-1 form. Animated canvas visualizations.
Phase 15 REDO
FDS Integration
Live
NIST FDS 6.x .fds input file generator from BIM geometry. Client-side fire simulation (t² HRR curves, NFPA 92B smoke layer height, RTI sprinkler activation, FED/STHC tenability). Three.js animated 3D fire visualization. Timeline playback with spacebar.
Phase 16
Design Book
Live
7-tab document system — cover, sheets, schedules, placeholders, products, procurement, export. DOB filing sequence A-000→EN-002. Product catalog with Pella windows, Simpson Strong-Tie connectors. CSV export and contractor package JSON.
Phase 17
Materials Procurement
Live
Materials procurement schedule auto-built from design book. Cost totals, lead times, order status tracking. Exportable for contractor handoff.
Phase 18
AI Collaboration Agent
Live
AI agent that understands your BIM model — can answer questions about the building, suggest improvements, identify coordination issues. Context-aware across your model and documents.
Phase 19
Year Energy Visualization
Live
Animated 8,760-hour EnergyPlus output visualization. Timeline player (hour/day scrub). Room temperature heatmap on 3D mini-viewport (blue=cold → red=hot). Monthly stacked heating/cooling bar charts. 24h HVAC load curve SVG. Peak load, total EUI, worst zone dashboard. MP4/WebM export.
Phase 20
Landing + Access Control
Live
Professional landing page with full roadmap. Role-based access control — admin gets full tool, non-admin users land in app with feature gates and clear "coming soon" state. No subscription UI yet.
Phase 21
Subscription System
Live
Stripe-powered subscription billing — $30/mo or $330/yr (1 month free). 30-day free trial. Equal access for all users (admin and non-admin). Self-serve account dashboard: invoice history, change plan, cancel. 1-button cancellation with 1-year read-only hold before account deletion.
Phase 22
MEP Systems
Planned
HVAC duct layout, plumbing risers, electrical conduit routing. Load calculations per system. Clash detection between BIM elements and MEP runs. Priority-based scheduling for construction.
Phase 23
Cost Estimation
Planned
RSMeans-based cost estimation from BIM model. Element-level and whole-project cost summaries. Cash flow scheduling. Quantity take-off from placed elements.
Phase 24
Phasing & Construction
Planned
Phasing overlays on the 3D model. Construction sequence planning. Temporary condition modeling. Site logistics visualization. 4D scheduling (3D + time) integration.
Phase 25
PDF Export & DOB Filing
Planned
One-click PDF export for all filing documents — DOB PW-1, EN-1, A-400, Design Book, fire analysis reports. Print-ready layout. Direct filing workflow with DOB NOW API integration where available.

Pricing

Professional BIM.
Fair price.

Below SketchUp. Above everything else. Every feature included — no tier gates, no upgrade popups.

Monthly
$30/mo
Billed monthly. Cancel anytime.
30-day free trial
All modules included
Unlimited projects
Real-time collaboration
No feature gates
BEST VALUE
Yearly
$330/yr
Save $30 vs monthly — 1 month free
30-day free trial
All modules included
Priority support
Unlimited projects
No feature gates

30-day free trial on any plan. No credit card required to start. Stripe powers billing — your card details never touch our servers.

FAQ

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