OpenConstructionERP vs STACK

OpenConstructionERP9.4Visit STACK9.0Visit

Higher score OpenConstructionERP #1 in Construction Estimating Software 9.4/10 Free plan Free plan✓ 4 of 5 features Visit site

vs

STACK #4 in Construction Estimating Software 9.0/10 Free plan · 7-day trial Free planFree trial✓ 0 of 5 features Visit STACK

• OpenConstructionERP fits best

  Open-source teams needing full estimating depth

• STACK fits best

  Estimators needing takeoff and many integrations

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Side by side

Feature	OpenConstructionERP 9.4/10 Visit ↗	STACK 9.0/10 Visit ↗
At a glance
Editor score	9.4	9.0
Ranking	#1 in Construction Estimating Software	#4 in Construction Estimating Software
Best for	Open-source teams needing full estimating depth	Estimators needing takeoff and many integrations
Pricing model	Free	Free plan + paid
Starting price	Free plan	—
Free plan	✓	✓
Free trial	—	7 days
Deployment	Self-hosted, Desktop	Cloud, Desktop, Mobile
Platforms	Web, Windows, macOS, Linux	Web, Windows, iOS, Android
Support	Email, Community, Docs	Email, Live chat, Phone, Community, Docs
Integrations	6 integrations	17 integrations
Built for	Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features OpenConstructionERP 4/5 · STACK 0/5
Digital takeoff	✓ (best)	Not checked yet
Assembly library	✓ (best)	Not checked yet
Labor and material costs	✓ (best)	Not checked yet
Bid management	✓ (best)	Not checked yet
Accounting integrations	—	Not checked yet
Specs
Estimate limit	Not checked yet	Not checked yet
Platform	Hybrid	Not checked yet
Our review
Pros	BOQ, cost databases, assemblies, and hierarchical estimate management CAD/BIM and PDF takeoff across major construction file formats Free AGPL-3.0 model with web, desktop, API, and self-hosted options	Digital takeoff supports area, linear, count, and other measurements AI takeoffs, drawing comparison, reports, and estimate dashboards Integrations span accounting, ERP, CRM, and construction systems
Cons	Accounting integrations are not included The broad feature set may exceed the needs of simple estimating teams AI-assisted workflows require connections to external LLM providers	The Free plan limits access to core takeoff and plan-markup tools ERP connectors are available only as a Pro add-on Premium and Pro subscriptions use 12-month terms
Our verdict	OpenConstructionERP is an open-source, self-hosted construction ERP for companies managing estimating and project workflows. Its core scope covers bills of quantities, hierarchical cost estimates, construction cost databases, resource… Read the review →	STACK is a cloud-based construction preconstruction platform for specialty contractors, general contractors, suppliers, manufacturers, owners, and developers. Its Takeoff & Estimate product combines digital plan upload, viewing, markup,… Read the review →

Strengths and trade-offs

• OpenConstructionERP — where it wins

  • BOQ, cost databases, assemblies, and hierarchical estimate management
  • CAD/BIM and PDF takeoff across major construction file formats
  • Free AGPL-3.0 model with web, desktop, API, and self-hosted options

  Where it doesn't

  • Accounting integrations are not included
  • The broad feature set may exceed the needs of simple estimating teams
  • AI-assisted workflows require connections to external LLM providers

• STACK — where it wins

  • Digital takeoff supports area, linear, count, and other measurements
  • AI takeoffs, drawing comparison, reports, and estimate dashboards
  • Integrations span accounting, ERP, CRM, and construction systems

  Where it doesn't

  • The Free plan limits access to core takeoff and plan-markup tools
  • ERP connectors are available only as a Pro add-on
  • Premium and Pro subscriptions use 12-month terms

• OpenConstructionERP9.4/10 · Free plan

  A free, open-source estimating platform with unusually broad takeoff, modeling, and tendering coverage.

  Visit siteFull verdict →
• STACK9.0/10 · Free plan · 7-day trial

  STACK combines digital takeoff, estimating, AI tools, and construction integrations.

  Visit STACKFull verdict →