Comparison
CostKit vs STACK: which one fits your work?
Both are construction estimating tools but they're built for different jobs. Here's an honest side-by-side — pricing, what each does well, where each falls short, and the contractor profile each one is actually for.
STACK has built a strong reputation in commercial-trade estimating. The cloud-based architecture means an estimator in the office and a project manager in the field can both pull up the same takeoff in real time. STACK's assembly-based estimating is its strongest differentiator — instead of building costs line by line, you apply pre-built assemblies (e.g., 'standard duplex outlet rough') to areas of a drawing and the quantities cascade automatically.
CostKit takes a fundamentally different approach: instead of measuring drawings, you describe the project. The two tools serve different customers — STACK for commercial trade estimators who live in PDF plans, CostKit for residential and light-commercial contractors who price work from project descriptions.
At a glance
CostKit
AI-generated phase-by-phase estimates in under 60 seconds. Built for contractors who bid 5–30 jobs a month and want a professional PDF without spending hours in spreadsheets. $0–$179/mo.
STACK
Cloud-based takeoff and estimating software with strong support for assembly-based estimating. Used heavily by trade contractors on commercial projects. Free tier available; paid plans range roughly $2,999/yr to $5,000+/yr.
Pricing comparison
STACK pricing is approximate and may not be publicly listed in all cases. Always confirm with their sales team for current numbers.
Feature-by-feature
When to choose STACK
- You're a commercial trade contractor (electrical, mechanical, roofing, painting) bidding work from PDF drawings.
- You estimate jobs valued $50K–$5M+ where takeoff precision affects margin meaningfully.
- You have multiple estimators or PMs who need to collaborate on the same takeoff in real time.
- You've built or want to build a library of assemblies specific to your trade and reuse them across many jobs.
- You can absorb the $2,999+/yr cost and have 5+ days for training and assembly setup.
When to choose CostKit
- You bid residential or light-commercial work where projects come with a verbal scope, not architectural drawings.
- You bid 5–30 jobs a month and your bottleneck is estimating speed, not measurement precision.
- You're a solo contractor or small trade firm (1–10 people) and the $3,000+/yr STACK cost is hard to justify against the volume of bids you do.
- You want predictable monthly pricing ($0–$179/mo) instead of an annual contract starting at $2,999.
- You need to be productive on day one without weeks of assembly setup.
STACK pros and cons
Pros
- Best-in-class assembly-based estimating
- Cloud-native architecture, multi-user collaboration
- Strong commercial-trade community and templates
- Decent free tier for trying it out
- Robust takeoff capabilities from PDF plans
Cons
- Paid tiers start at $2,999/yr — high commitment for small contractors
- Pricing is sales-quoted (not transparent on the website)
- Steep learning curve, especially the assembly system
- Requires PDF drawings — useless for description-based residential bidding
- Assembly maintenance becomes a job in itself as supplier prices change
Verdict
STACK is the right pick for commercial trade contractors who bid from drawings, work in teams, and need assembly-based estimating to maintain margin across many similar bids. CostKit is the right pick for residential and light-commercial contractors who bid from descriptions, work solo or in small teams, and want AI to handle the work that STACK requires assemblies to do. The two tools rarely overlap on the same customer — pick based on whether your input is drawings or descriptions.
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