KNTRCTR review

KNTRCTR ranks sixth as a focused bid tool for primes, especially in heavy civil. You post private or public jobs, invite the companies you already work with and set bid expectations so every quote answers the same lines, then compare, level, message and award from the Bids tab. Rex AI is included in the seat: Rex Build drafts packages from drawings, a budget and notes, quotes that arrive by email are read onto the same lines, and AI checks flag outliers, missing answers and past reviews before award. Reviews and kickoff records stay with the job for the next bid. Invited subs bid free with a Free Bidder account. The first seat costs $250 a month and each extra person $50, month to month, after a 30-day free trial. The network is smaller than the big bid platforms, so it works best when you already have the subs you want to invite.

Who it is for

Prime contractors who want a month-to-month bid tool with AI leveling help and free bidding for invited subs.

Price

$250 a month for the first seat, $50 for each additional seat, month to month.

First seat Billed monthly $ 250 USD $ 330 CAD Additional seats Each extra person, monthly $ 50 USD
Quoted from the vendor pricing page on November 10, 2026.

Key features

• Post private or public jobs and invite the companies you work with
• Bid expectations so every quote answers the same lines
• Compare, level, message and award from the Bids tab
• Rex Build drafts bid packages from drawings, a budget and notes
• Emailed quotes read onto the same lines, plus AI checks for outliers and missing answers

Strengths and weaknesses

• Strength: Month to month with no annual contract
• Strength: Invited subcontractors bid for free
• Strength: Rex AI is included in the seat price
• Weakness: Smaller network than BuildingConnected or PlanHub
• Weakness: Focused on heavy civil and general contractors
• Weakness: First seat costs more than entry plans elsewhere

Key facts

• Price: $250 a month first seat, $50 each additional seat
• Contract: Month to month, no annual contract
• Free trial: 30 days
• Invited bidders: Free Bidder account to open the job, ask questions and submit a bid

Where it ranks

KNTRCTR is No. 5 in our Best Construction Bidding Software verdict.