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Construction · head to head

Oracle Primavera Unifier vs STACK Construction Technologies

Oracle Primavera Unifier logo

Oracle Primavera Unifier

Construction

Capital programme cost, contract and facilities management for owners running multi-year portfolios

From
On request
Rated
-
Full reviewWebsite
STACK Construction Technologies logo

STACK Construction Technologies

Construction

Takeoff and estimating software for preconstruction

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only STACK Construction Technologies has a free tier, so it costs nothing to try first.
  • Each has a real cost: Oracle Primavera Unifier nothing works until it is configured, so the first useful business process is months away and usually costs more in partner services than the first year of licences; organisations that budget for software and not for implementation stall.; STACK Construction Technologies takeoff and Estimate is priced per user at $249 per user per month, so cost scales linearly with estimators
  • They diverge on capability: Oracle Primavera Unifier covers uDesigner configuration, STACK Construction Technologies covers Digital takeoff.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Oracle Primavera Unifier and STACK Construction Technologies actually diverge.

Attributes where Oracle Primavera Unifier and STACK Construction Technologies differ
AttributeOracle Primavera UnifierSTACK Construction Technologies
Starting priceOn requestFree
Pricing modelquotesubscription
Free tierNoYes
FoundedUnknown2011

Identical on both: platforms (Web, iOS, Android), user rating (Not yet rated), category (Construction).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Oracle Primavera Unifier

  • uDesigner configuration
  • Cost sheet
  • Funding management
  • Change management
  • Facilities and asset management
  • Schedule integration
  • Document management
  • Reporting and BI Publisher

Only in STACK Construction Technologies

  • Digital takeoff
  • Estimating
  • Bid management
  • Proposal generation
  • Plan storage
  • QuickBooks
  • Sage
  • Procore

What people use each for

The jobs each tool is most often brought in to do.

Oracle Primavera Unifier

  • A state transport agency tracking dozens of concurrent projects funded from separate multi-year appropriations, where the audit trail on which fund paid for which change order matters more than scheduling detailnot STACK Construction Technologies
  • A university estates office that needs one cost sheet spanning design, construction and handover, with the asset data surviving into facilities management rather than being rekeyednot STACK Construction Technologies
  • A utility that must produce regulator-facing cash flow and capitalisation reports directly from the project controls system rather than from a spreadsheet reconciled once a quarternot STACK Construction Technologies
  • An owner already committed to Primavera P6 and Aconex that wants cost and contract control in the same estate rather than adding a separate construction ERPnot STACK Construction Technologies

STACK Construction Technologies

  • Construction project estimation and biddingnot Oracle Primavera Unifier
  • Field operations and daily reportingnot Oracle Primavera Unifier
  • Construction project managementnot Oracle Primavera Unifier
  • Material and labor takeoffnot Oracle Primavera Unifier

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Oracle Primavera Unifier

  • Nothing works until it is configured, so the first useful business process is months away and usually costs more in partner services than the first year of licences; organisations that budget for software and not for implementation stall.
  • Modules are licensed separately, so an organisation that starts with Project Controls and later wants facilities and asset management faces a second negotiation at whatever list price applies then, not the rate it originally agreed.
  • Per-user licensing punishes occasional participants: a project sponsor who approves four invoices a year consumes the same licence as a full-time cost controller unless workflows are redesigned to keep them out of the system.
  • Oracle's term licence pricing is a percentage of the perpetual list rising with duration, which means a one-year term looks affordable and then the renewal maths pushes buyers into long commitments they cannot easily exit.
  • The interface is dated relative to modern construction software and field users resist it, so many implementations end up with Unifier as an office system and a separate mobile tool for site, which reintroduces the data gap it was bought to close.

STACK Construction Technologies

  • Takeoff and Estimate is priced per user at $249 per user per month, so cost scales linearly with estimators
  • The full platform combining takeoff, estimating and field management starts at $298 per user per month
  • Field and project management is sold as a separate Build and Operate product starting at $49 per user per month rather than bundled with takeoff
  • The Build and Operate product offers only a two-week free trial, with the free version limited to Takeoff and Estimate

Pricing, plan by plan

Oracle Primavera Unifier

On request
  • Unifier Project Controls$undefined/year
    • Per-user licensing
    • Cost, contract and change management
    • uDesigner business process configuration
  • Unifier Facilities and Asset Management$undefined/year
    • Separately licensed module
    • Asset register and maintenance
    • Space and portfolio management

STACK Construction Technologies

Free
  • Takeoff & Estimate$249/month
    • Quantity takeoff capabilities
    • Labor and material takeoff
    • Flexible estimates and proposals
  • Build & Operate$49/month
    • Responsive plan viewing and markup
    • Issues, punch lists, and daily reports
    • Customizable workflows
  • Full STACK Platform$298/month
    • Plan measurement and markup
    • Integrated estimating
    • Field and project management

Which should you pick?

Choose Oracle Primavera Unifier if

  • You need udesigner configuration.
  • You work on Web, iOS, Android.
  • You also want cost sheet.
Oracle Primavera Unifier review

Choose STACK Construction Technologies if

  • You need digital takeoff.
  • You want to start without paying.
  • You work on Web, Ios, Android.
  • You also want estimating.
STACK Construction Technologies review

Questions people ask

Is Oracle Primavera Unifier or STACK Construction Technologies better?
Neither clearly leads. Oracle Primavera Unifier starts at On request and STACK Construction Technologies at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Oracle Primavera Unifier or STACK Construction Technologies?
STACK Construction Technologies has a free tier; the other does not. Paid plans start at On request for Oracle Primavera Unifier and Free for STACK Construction Technologies.
Does Oracle Primavera Unifier or STACK Construction Technologies run on more platforms?
Oracle Primavera Unifier runs on Web, iOS, Android. STACK Construction Technologies runs on Web, Ios, Android.
Can I use STACK Construction Technologies for free?
Yes. STACK Construction Technologies has a free tier, so you can try it without paying. Oracle Primavera Unifier starts at On request.
What is Oracle Primavera Unifier best used for?
Oracle Primavera Unifier is most often used for a state transport agency tracking dozens of concurrent projects funded from separate multi-year appropriations, where the audit trail on which fund paid for which change order matters more than scheduling detail, a university estates office that needs one cost sheet spanning design, construction and handover, with the asset data surviving into facilities management rather than being rekeyed, a utility that must produce regulator-facing cash flow and capitalisation reports directly from the project controls system rather than from a spreadsheet reconciled once a quarter, an owner already committed to primavera p6 and aconex that wants cost and contract control in the same estate rather than adding a separate construction erp. Of those, a state transport agency tracking dozens of concurrent projects funded from separate multi-year appropriations, where the audit trail on which fund paid for which change order matters more than scheduling detail and a university estates office that needs one cost sheet spanning design, construction and handover, with the asset data surviving into facilities management rather than being rekeyed are not what STACK Construction Technologies is typically brought in for.
What can Oracle Primavera Unifier do that STACK Construction Technologies cannot?
Oracle Primavera Unifier covers uDesigner configuration, Cost sheet, Funding management, Change management. STACK Construction Technologies covers Digital takeoff, Estimating, Bid management, Proposal generation.

Answered from the vendors’ own pages

Oracle Primavera Unifier: Does Oracle publish Unifier pricing?

No. Unifier is quoted per user and per module through Oracle or a partner. Global price lists exist for some Primavera products but Unifier is negotiated.

STACK Construction Technologies: How much does STACK Construction cost?

STACK costs $49 to $298 per user per month depending on the plan. Build & Operate starts at $49/user/month, Takeoff & Estimate at $249/user/month, and Full STACK Platform at $298/user/month. Pricing is quoted per-user and scales with team size.

Source
Oracle Primavera Unifier: Is Unifier the same as Primavera P6?

No. P6 is scheduling. Unifier is cost, contract, change and asset management. Owners commonly run both and integrate them.

STACK Construction Technologies: Does STACK offer free options?

Yes, Takeoff & Estimate includes a free version, and Build & Operate includes a two-week free trial. Full STACK Platform offers a Build Your Price option for custom configurations.

Source
Oracle Primavera Unifier: Can we still buy a perpetual licence?

Yes, perpetual licensing remains available alongside term licences, and Oracle prices terms as a percentage of the perpetual list. Check which your quote is based on.

STACK Construction Technologies: Can I get custom pricing from STACK?

Yes, STACK offers a Build Your Price option for the Full STACK Platform and Takeoff & Estimate to accommodate specific business requirements. Custom pricing requires direct consultation with their sales team.

Source
Oracle Primavera Unifier: Who owns the data at project closeout?

The customer owns its data. Export is possible through the API and reporting layer, but configured business process records do not move cleanly into another system, so plan closeout extraction before you need it.

STACK Construction Technologies: How quickly can STACK be implemented?

STACK promises quick implementation measured in hours rather than weeks, though the exact timeframe depends on your configuration and team size.

Source
Oracle Primavera Unifier: Is it suitable for a general contractor?

Rarely. Unifier is built around the owner's funding and contract position. Contractors are usually better served by Procore or Autodesk Construction Cloud.

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