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Head-to-head · HVAC Estimating Software

STACK vs OneEstimate

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score STACK #3 in HVAC Estimating Software 7.8/10 Free plan · 7-day trial Free planFree trial✓ 0 of 6 features Visit STACK
OneEstimate #5 in HVAC Estimating Software 7.7/10 Free plan Free plan✓ 4 of 6 features Visit OneEstimate

STACK leads on 0 checks, OneEstimate on 0, and 5 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreSTACK · 7.8/10
  • Free planboth
  • Free trialonly STACK
  • Most featuresOneEstimate · 4 of 6

STACK scores higher on our rubric for hvac estimating software: 7.8 against 7.7 out of 10; our editors rank them #3 and #5.

STACK is the better fit for teams needing broad takeoff and estimating workflows. OneEstimate is the better fit for small HVAC teams wanting low-cost takeoff and proposals.

  • STACK fits best

    Teams needing broad takeoff and estimating workflows

  • OneEstimate fits best

    Small HVAC teams wanting low-cost takeoff and proposals

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature STACK 7.8/10 Visit ↗ OneEstimate 7.7/10 Visit ↗
At a glance
Editor score 7.8 7.7
Ranking #3 in HVAC Estimating Software #5 in HVAC Estimating Software
Best for Teams needing broad takeoff and estimating workflows Small HVAC teams wanting low-cost takeoff and proposals
Pricing model Free plan + paid Free plan + paid
Starting price — $19/mo
Free plan ✓ ✓
Free trial 7 days —
Deployment Cloud, Desktop, Mobile Cloud
Platforms Web, Windows, iOS, Android Web
Integrations 17 integrations 1 integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market
Features STACK 0/6 · OneEstimate 4/6
HVAC cost database Not checked yet ✓ (best)
Labor-rate database Not checked yet ✓ (best)
HVAC takeoff tools Not checked yet ✓ (best)
Proposal builder Not checked yet ✓ (best)
Job costing Not checked yet Not checked yet
QuickBooks sync Not checked yet Not checked yet
Specs
Mobile apps Not checked yet Not checked yet
Our review
Pros
  • Digital measurements, markups, overlays, and drawing comparisons
  • Labor, material, item, and assembly estimating worksheets
  • Web, desktop, mobile access with accounting and ERP integrations
  • HVAC assemblies cover equipment, ductwork, insulation, and refrigerant
  • On-screen takeoff measures duct runs and counts fixtures or equipment
  • Branded PDF proposals and Excel exports support client-ready estimates
Cons
  • Workflows are construction-wide rather than HVAC-specific
  • ERP connectors are available only as a Pro add-on
  • Free plan focuses on viewing, markup, and core takeoff tools
  • Free and START plans limit takeoff to one per project
  • The product is available through the web only
  • Business-level BIM support is limited to IFC import
Our verdict

STACK is a cloud-based construction preconstruction platform for specialty contractors, general contractors, suppliers, manufacturers, owners, and developers. Its Takeoff & Estimate product lets HVAC teams upload digital plans, mark up…

Read the review →

OneEstimate is browser-based estimating software tailored to HVAC contractors and small construction teams. Its assemblies cover equipment, ductwork, insulation, refrigerant, diffusers, and grilles, while plan takeoff converts measured…

Read the review →
  1. STACKHVAC Estimating Software 7.8Free plan · 7-day trial
  2. OneEstimateHVAC Estimating Software 7.7Free plan

Strengths and trade-offs

  • STACK — where it wins

    • Digital measurements, markups, overlays, and drawing comparisons
    • Labor, material, item, and assembly estimating worksheets
    • Web, desktop, mobile access with accounting and ERP integrations

    Where it doesn't

    • Workflows are construction-wide rather than HVAC-specific
    • ERP connectors are available only as a Pro add-on
    • Free plan focuses on viewing, markup, and core takeoff tools

  • OneEstimate — where it wins

    • HVAC assemblies cover equipment, ductwork, insulation, and refrigerant
    • On-screen takeoff measures duct runs and counts fixtures or equipment
    • Branded PDF proposals and Excel exports support client-ready estimates

    Where it doesn't

    • Free and START plans limit takeoff to one per project
    • The product is available through the web only
    • Business-level BIM support is limited to IFC import
  • STACK7.8/10 · Free plan · 7-day trial

    Broad digital takeoff and estimating for HVAC teams that need construction-wide workflows.

    Visit STACKFull verdict →
  • OneEstimate7.7/10 · Free plan

    HVAC-focused takeoff and proposals with a permanent free tier and web delivery.

    Visit OneEstimateFull verdict →

More comparisons

All HVAC estimating software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update