For Prime Contractors
Run your subcontractors with structure.Not memory.
KNTRCTR is subcontractor management software for prime contractors. Post the job, invite your crew, compare what comes back, award the work, and keep the record for next time. One place from the first invite through the last review.
Write the job once.Bids come back ready to compare.
Post a bid request with the dates, scope, requirements, and expectations your crews can actually respond to. Say what the work includes, what they have to meet, and how you want quotes broken out. Attach drawings, specs, and other documents so the request carries everything they need.
Save a request as a template, or load a saved draft, so the next post is not a blank form.
Rex Build
Attach the customer's documents, the drawings, and your budget and notes. Rex drafts the bid packages for your review. Nothing sends until you do.
Bid request
Dates
Bid deadline
Mar 12, 2027
Work window
Apr 12 to May 21, 2027
Scope
Storm drainage package for the SR-19 widening, Phase 2. Install 1,840 LF of RCP with 24 structures. Bedding and backfill included. Pavement restoration by others.
Requirements
Bid expectations
Equipment · 30-ton class excavator with thumb
Must answerMaterial · #57 stone bedding
Qty 1,200 TonPersonnel · Prevailing wage, union or open shop
Must answerScope · Dewatering
OptionalAttachments
Drop files or browse
The crews you already trust are one click away, and their bids are free.
Pull from saved lists or invite one company at a time. Invited bids are always free. If a quote arrived by email, enter it by hand so it still sits in the same comparison.
Rex fill
Did your sub email the quote instead of using KNTRCTR? Drop the file on the package.
Within seconds Rex reads it onto the scope items so it's ready to compare along with the others.
Invited companies
Private invite only
Invited bids are free.
Compare bids. Level without hiding the original.The record sits beside every bid.
Compare what came in on the Bids tab. Level line items and add adjustments without hiding the submitted number. Show Bid Details and Show Bidders Past Work sit on the same card, so you can open the quote or their past jobs without leaving the list. Beside every bid is that sub's track record.
Rex's read
Rex reads every bid, then opens the attachments. A line left out lands on the scope item it belongs to.
Bids (3)
Harbour Utilities
Maya Chen · Estimator
$168,200.00
Leveled: $180,600.00
Submitted Mar 12, 2027
Pricing
Bid Expectations
Bidders must answerOpen cut and restoration: Cover the trench and restore to existing grade.
View
Covered. Open cut and restoration included as specified.
Decision notes
None yet.
Mobilization: Separate line. Do not bury it in the watermain total.
View
Excluded: Not in the base price.
Using
$12,400.00
was $0.00
Decision notes
None yet.
Rex AI reads the field.Before you award.
What I'm Seeing sits next to your custom AI checks, field flags, and the rest of the Stage 1 read, and it updates as the field changes. Flip through each company's findings in the carousel, or ask Rex AI in the chat on the job.
Rex AI auto-fills the scan from the bids and attachments. If a sub left bid expectations blank, or emailed a quote, it can fill those answers from the document so the comparison still has a complete row.
Analysis only. The award stays yours.
See how Rex AI worksHow I'm reading this job
Deep dives 1 of 3What I'm Seeing
UpdatedHarbour Utilities came in the tightest at $168,200 while Riverside Civil is the highest bid at $189,750.
Direction is still pointing the same way after 1 of 3 deep dives completed; Harbour Utilities has not yet been reviewed.
The evidence so far still points toward Harbour Utilities as the candidate to examine first, based on lowest price at $168,200. Mobilization looks left out of that total. The completed deep dive on Riverside Civil confirms their $189,750 bid is complete and well documented, but the premium over the rest of the field is real.
Analysis
My field scan of each company, one card at a time. These stay as I first read them. Hit Dig Deeper on any of them to run Stage 2, and your deep dives sit below.
Harbour Utilities
My Read
Strong reliability history and a complete bid, but the price carries a meaningful margin over the rest of the field on every line.
Past Performance Snapshot
My Read
This is what I'm seeing here: lowest in the field at $168,200, but mobilization looks excluded from the total. The number is not the same job until that line is on the comparison.
Risk signal worth a closer look: Moderate. Check the Before You Call notes for the key clarification points.
Past Performance Snapshot
How their price stacks up to the rest
Price Competitiveness
Before You Call
My Read
On budget with scope covered. Mobilization is in the total, so this number is the same job the request asked for.
Past Performance Snapshot
Estimating hands it to procurement without anyone rebuilding the file.
Bids, discussions, documents, and kickoff details live in one place. Add the people who need the picture. Run the kickoff checklist with the awarded sub before anyone hits the site.
The dashboard is home base for every job you posted. When a site or phase is more than one request, group those jobs under a Project so the package stays together.
Job kickoff after awardProjects and the dashboardKickoff Checklist
Either company can check items off.
The review you write today is sitting next to their number the next time they bid.
After the job, record how they performed. That review is waiting when their name comes up again. Share it with the sub if you want, make it public, or keep it internal. Use it as your private record, or as a chance to collaborate on the next job. This is the piece KNTRCTR hangs its hat on.
Rex remembers
When Rex runs an analysis in the future, he stacks that review up with the current bid so the lowest number is also the safest bet.
Performance review
Oak & Stone · Front St storefront package
Overall score
Completed by Jordan Hale · Estimator · Mar 18, 2027
- Quality of Work
- Timeliness
- Communication
- Safety Compliance
- Site Cleanliness
- Budget Adherence
- Problem Solving
- Team Conduct
- Scope Alignment
- Work with them againYes
Field feedback
Glass and metal went in clean, and they held the close date. Safety stayed tight the whole job. The last pour left debris on the sidewalk that the superintendent had to chase.
Office feedback
Their estimator priced the lines we sent and answered a scope question the same day. The sidewalk exclusion was in the email before award, not buried in the attachment. One revision came in after the deadline. The number was still easy to follow.
Questions from primes.
What is Rex Build?
Rex Build drafts the bid packages from the documents you already have. Attach drawings, a budget, and notes, and Rex proposes a package for each trade or crew.
Those packages sit together on the project, with the map open, so you can see who is pricing what before anyone is invited. Nothing goes out until you review the draft and send the invitations yourself.
Can Rex add a bid that arrives by email at the deadline?
Yes. Subcontractors often hold the number until the bid closes so it cannot be shopped. The PDF lands in the inbox as the package is closing, and retyping every line is how a bid gets left off the comparison.
Drop the quote on the package and paste the email beside it. Rex reads the price onto the same scope lines in seconds. You confirm the total before it is saved. That bid then sits on the form with the quotes that came in through the invitation, ready to compare.
Do I have to find new subcontractors to use KNTRCTR?
No. Most companies begin by inviting the subcontractors they already work with.
KNTRCTR strengthens existing relationships before expanding into new ones.
How can I invite my existing subcontractors to bid on a job?
You can invite existing subcontractors directly, invite from saved lists, or use mass CSV upload to bring in your current contacts first. You can also email a partner who is not on KNTRCTR yet.
When you submit the invitation, you can send it to a saved list in one click. Everyone on that list gets the request. Later job updates and messages go to those same companies.
Jobs stay private unless you choose public inside KNTRCTR. Public still means signed-in KNTRCTR users, not the open web.
On the job, that invite block is labeled Crew Control. It is who you invite to bid, not the people on your own team.
Once your network is organized, posting a job and inviting your known subcontractors takes only a few clicks.
Is KNTRCTR free to use?
Lead contractors get a 30-day free trial, then a flat monthly subscription. No hidden fees, no commissions.
Subcontractors invited to bid can respond for free. No subscription required. If they subscribe, they get Rex AI on the draft, plus past work on their profile, Network visibility, and public jobs.
What happens after a job is awarded?
All bidders are notified by email about the decision. The awarded company knows they won, and everyone else knows the job is decided.
The job stays in one workspace on KNTRCTR: scope and attachments, bids, and the job discussion thread.
After award, Job Kickoff is a dedicated space for start-of-work handoff.
The job moves through clear stages (for example awarded, in progress, completed).
When the work wraps, peer reviews and performance history stay tied to that job and that company, so your next award isn't based on memory alone.
No more relying on scattered updates when you award the next sewer, grading, or utilities contract.
One job.From the invite to the record.
KNTRCTR brings posting, bidding, award, kickoff, and performance into the same workflow. See it on a live bid request.