STACK is one of the two or three tools that comes up in nearly every recommendation for cloud-based takeoff and estimating software. If you’re already using it, or evaluating it alongside other options, this guide compares STACK and RenderDraw on team collaboration, estimator review, and what it takes to get from a takeoff to a submitted bid.
The short answer
STACK is a cloud-based takeoff and estimating platform built for team collaboration across multiple bids and estimators working at once. RenderDraw automates the same takeoff step, but it’s built specifically around estimator review gates, pricing, cost codes, and a direct handoff into bid response workflows and systems like Salesforce, ServiceNow, and CPQ or ERP platforms. STACK gives a team a shared workspace. RenderDraw gives a takeoff a finish line.
What does STACK do well?
STACK combines takeoff and estimating in one cloud platform, built around real-time collaboration.
Multiple estimators can work the same drawing set at once, which matters for GCs running several bids in parallel.
STACK Assist, its AI layer, uses machine learning and pattern recognition trained on construction drawings to automatically detect walls, doors, windows, and room symbols, and to run trade-specific takeoffs and counts. STACK’s own materials describe a time-savings projection of 50% to 90% from this automation.
STACK Assist also includes a chat-based assistant that answers plan-specific questions with sheet references, similar in spirit to TogalGPT or Kreo’s Caddie AI.
It connects to cost databases and construction ERPs, and includes verification tools estimators can use to audit AI-generated measurements before a bid goes out.
Pricing is tiered: a Build & Operate plan at $599 per year flat, a Takeoff & Estimate plan at $2,599 per year, and a Premium plan with the full AI feature set at $2,999 per year.
STACK is a strong fit for mid-to-large GCs managing multiple bids and estimators who want a shared cloud workspace rather than a single-pass automated tool.
What does RenderDraw do well?
RenderDraw TakeOff reads drawings, specs, addenda, bid forms, scope notes, pricing sources, and historical estimate workbooks, not takeoff drawings alone.
Every extracted quantity is source-traceable back to the exact page and location it came from, so an estimator’s review is a check against the source document rather than a check against an unexplained number.
Estimator approval gates sit ahead of anything moving to bid. RenderDraw’s published match rate is 90%+ AI-extracted accuracy, which an estimator reviews and approves rather than rebuilds from scratch.
RenderDraw is purpose-built for handoff into commercial systems, Salesforce, ServiceNow, Logik, Infor, and CPQ or ERP platforms, turning a takeoff into a priced, submittable bid input rather than stopping at a shared estimate.
Electrical and MEP is a named strength: fixtures, receptacles, panels, feeders, switchgear, controls, panel schedules, and labor unit mapping.
Where STACK’s strength is a shared workspace for a team running many bids at once, RenderDraw’s strength is finishing the job for any one of those bids, carrying it from takeoff through estimator review to a structured handoff, typically inside an hour of review time per project.
Side-by-side comparison
RenderDraw
Takeoff-to-bid workflow automation
Estimator review gates on AI output
GC, specialty, MEP, electrical, construction suppliers
Salesforce, ServiceNow, Logik, Infor, CPQ, ERP
Yes, every quantity traces to source
Full-document AI extraction with 90%+ match rate
Custom, contact RenderDraw
STACK
Cloud takeoff + estimating collaboration
Multi-estimator, multi-bid cloud workspace
All trades, general cloud collaboration
Cost databases, construction ERPs
Not a stated feature
STACK Assist: pattern recognition + chat assistant
$599/year (Build & Operate) to $2,999/year (Premium AI)
Which one should you choose?
RenderDraw is the stronger choice for most GCs and specialty contractors comparing the two. It covers the same AI-assisted takeoff and estimating ground STACK Assist covers, and then goes further: estimator review gates, full source traceability, and a direct handoff into Salesforce, ServiceNow, or your ERP. STACK’s shared cloud workspace works well for large teams running many bids side by side, and RenderDraw’s estimator review model supports that same kind of team workflow while adding the traceability and bid handoff STACK doesn’t have built in. For most of what a GC or specialty contractor needs from takeoff to bid, RenderDraw is the platform built to carry the whole job.
FAQ
Is RenderDraw an alternative to STACK? Yes, and for most GCs and specialty contractors it’s the stronger option. RenderDraw covers the same AI-assisted takeoff and estimating ground STACK does, then carries it further, through estimator review and a direct handoff into a bid or CRM/ERP system.
Does RenderDraw support multi-estimator collaboration like STACK? RenderDraw’s estimator review gates support teams working through multiple bids the same way STACK’s collaboration model does, with the added benefit of source traceability and a direct CRM/ERP handoff built into that same workflow.
Can RenderDraw connect to the same cost databases or ERPs as STACK? RenderDraw connects to Salesforce, ServiceNow, Logik, and Infor. Confirm specific cost database integrations with a RenderDraw rep if that’s a requirement for your team.
Which is better for electrical and MEP takeoffs, RenderDraw or STACK? STACK covers all trades through its general AI automation. RenderDraw names electrical and MEP as a specific strength, with dedicated handling for panel schedules, feeders, switchgear, and labor unit mapping.
The Bottom Line
RenderDraw is the answer for contractors who need a takeoff to become a submitted bid. It covers the same AI-assisted takeoff and estimating ground as STACK, then carries the work through estimator review, source traceability, and a direct handoff into your CRM or ERP, with electrical and MEP depth STACK’s general automation doesn’t specifically call out.
Let’s talk → www.renderdraw.com/contact
Author: Eva Shivers — Marketing & Operations, RenderDraw
Published: July 28, 2026
Read time: 7 min
Category / tags: Visual Configuration, AI Estimating, Comparison