Compare Two Versions of a Contract
Upload your draft and the supplier's counter-proposal to auto-detect all differences and review them as redlines.
Written by Antonio Goncalves · Updated April 2026
ProcurementLegal
Overview
This flow uploads two versions of the same contract and uses AI to automatically detect all differences, displaying them as redlines for review.
Before You Start
Use this mode when a supplier sends back a marked-up counter-proposal. For a fresh AI-driven review against your playbook, use the standard Upload mode instead.
Step 1: Go to Workspaces
Click Workspaces in the left sidebar.
Step 2: Create a new workspace
Click + New Workspace in the top-right corner.
Step 3: Switch to the Compare tab
In the New Redline Project modal, click the Compare tab.
Step 4: Upload both documents
Fill in both document slots:
Original Document: your version of the contract.
Modified Document: the supplier's counter-proposal or revised version.
Both files must be DOCX or PDF (max 10 MB each). Both files should be the same contract — the comparison works best when document structure is similar.
Step 5: Wait for analysis
Vallor compares both files paragraph by paragraph, identifies all differences, and surfaces them as redlines. The Issues List populates when complete.
Step 6: Review the differences
Changes appear as opposing-party redlines. For each one:
Accept: agree with the change.
Reject: revert to original language.
Counter: AI generates a counter-proposal based on your playbook.
Step 7: Download the output
Click Actions > Download Document to export the final DOCX with tracked changes.
Tips & Workarounds
Tip: Use Compare mode when a supplier sends back a marked-up version. Use standard Upload mode for fresh reviews against your playbook.
Known issue: The Compare feature may occasionally produce blank or incomplete results. If you get a blank result, try re-uploading the files in a new workspace. Fix targeted for 20 April 2026.
Tip: Both files should be the same contract — the comparison works best when document structure is similar.
What to do next