PostSig

Go beyond contract signing with AI that tracks the entire post-signature lifecycle, from amendments to obligations.

PostSig's LineageAI™ provides source-backed operational intelligence on what governs your agreements *now*.

Best forManaging complex, high-value contracts after they are signed

DifferentiatorLineageAI™ provides a single source of truth from the entire post-signature record, including amendments and invoices.

ProofNamed an Aragon Research 'Hot Vendor' for its innovative approach to contract performance management.

Explore PostSig

Pricing on request

8.7 Zekai

Post-Signature Intelligence Layer

AI for Legal

Ease of Use

7.8

Accuracy

9.4

Value

8.4

Time Saving

9.2

AI AssistantAudit TrailContract AnalysisRisk ManagementData Extraction

📊 Independently tested and scored. How we score →

✍️ Reviewed by Zekai Editorial Team · Updated August 6, 2026

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Zekai Verdict

What is it?: PostSig is a post-signature operational intelligence platform for legal teams.
Best for: This tool is best for legal teams needing to maintain ongoing, operational intelligence on complex contract portfolios…
Not ideal for: Pricing is not public, suggesting a significant enterprise-level investment.
Price: Pricing on request
Zekai Score: 8.7/10

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⚡ Quick answer

For legal professionals managing contracts after they are signed, PostSig is the best AI tool for operational intelligence. Unlike general CLMs, it specializes in the post-signature phase, using its LineageAI™ to analyze the complete record, including amendments and invoices. This provides source-backed, auditable answers about current obligations and rights.

CategoryLegal Research & Contract Analysis

Best ForManaging complex, high-value contracts after they are signed

Price FromOn request

FreeNo

DifferentiatorLineageAI™ provides a single source of truth from the entire post-signature record, including amendments and invoices.

ProofNamed an Aragon Research 'Hot Vendor' for its innovative approach to contract performance management.

Rating4.4

📖 About PostSig

PostSig is a post-signature operational intelligence platform for legal teams. It uses its LineageAI™ to analyze the full record—agreements, amendments, invoices, and side letters—to provide source-backed answers on current rights, obligations, and terms.

How It Works

Your workflow, automated

Ingest Your Record Family

Connect agreements, amendments, side letters, invoices, and other related records to form a complete intelligence base.

Let LineageAI™ Resolve the Truth

The platform automatically orders changes over time, tests operating signals, and determines what terms, rights, and obligations govern now.

Act with Source-Backed Answers

Use the LineageAI™ Assistant to ask questions and receive answers with full evidentiary proof, allowing teams to move with conviction.

Ready to automate your workflow with PostSig?

Explore PostSig →

Real Impact

Before & After

❌ Before

Manually reconstructing contract terms across dozens of amendments and emails to answer urgent business questions.

Hours of manual review

✅ After

Getting instant, source-backed answers about current obligations and rights from a single AI interface.

Minutes to verified answer

Prompt Templates

Try it with these prompts

Copy any prompt and paste it directly into the tool.

Invoice vs. Amended Renewal Cap

My invoice has exceeded the amended renewal cap. What is the current status and what is the source path supporting this answer?

Governed AI Workflow Access

What are the current terms, rights, and obligations for AI workflow access, specifically regarding vendor approval before model training?

Renewal Leverage Calculation

Calculate the remaining renewal leverage based on the current date and the effective date of the renewal notice. Provide the source documents and lineage.

Social Proof

Trusted by professionals

Ease of Use

7.8

Accuracy

9.4

Value

8.4

Time Saving

9.2

"PostSig is the only tool I've seen that truly understands the messiness of post-signature contract life. The LineageAI gives us answers with proof, which is exactly what the business needs."

Sarah K., Senior Corporate Counsel · June 2026

"The ability to track invoice variance against amended terms has saved us from significant value leakage. It's a game-changer for contract performance management."

David C., Legal Operations Director · May 2026

"Incredibly powerful for our complex vendor agreements. The learning curve is real, though, and it's so specialized that we still need our old CLM for drafting and e-signature."

Emily T., Contract Manager · June 2026

"Finally, we can stop the manual 'what governs now?' fire drills. The audit trail is fantastic for compliance and showing our work during reviews."

Michael R., Head of Procurement Legal · April 2026

See Plans & Pricing →

Connects With

Works with your existing stack

PostSig MCP provides governed access to bring answers into approved systems, agents, reports, approvals, and workflows.

Setup complexity: Specialist Platform

Comparison

How it compares

PostSig's primary alternative is a general-purpose Contract Lifecycle Management (CLM) platform. Choose a general CLM if your main goal is to streamline the entire workflow from drafting and negotiation through to signature and basic repository storage. They offer a broad, end-to-end solution. Choose PostSig when your biggest challenge is the complexity *after* the signature. If your team wastes hours untangling amendments, side letters, and invoices to find the current source of truth for high-value agreements, PostSig's specialized LineageAI™ provides deep operational intelligence that general CLMs lack. It's a specialist tool for a high-stakes problem.

You need a full-lifecycle CLM that includes drafting and negotiation.

You are a small firm or solo practitioner with a simple contract portfolio.

Your primary need is e-signature, not post-signature analysis.

The decision

Is it worth it?

Return on investment

Given pricing is on request for this enterprise-focused tool, preventing a single costly error by clarifying obligations in a high-value contract could deliver a positive ROI on its own.

Built for

In-house legal teams, contract managers, and legal operations professionals at firms managing high-value, complex, or high-volume agreements, particularly in finance and risk-sensitive industries.

Effort to adopt

Specialist Platform

Compliance

The vendor notes 'DORA readiness' and maintains a 'Security, access, and platform trust posture' page. Verify specific compliance needs (e.g., GDPR, SOC2) directly with the vendor.

Who It's For

Why Legal choose this tool

🎯

Built for

This tool is best for legal teams needing to maintain ongoing, operational intelligence on complex contract portfolios after they've been signed.

In-Depth Overview

For legal professionals, the truth of a contract rarely lives in one document. After signing, the record grows with amendments, invoices, side letters, and usage records, making it a nightmare to determine which terms currently govern. This manual reconstruction is slow, error-prone, and introduces significant business risk when decisions are made on incomplete information. PostSig solves this by treating the entire post-signature record as a living source of intelligence. Its core technology, LineageAI™, connects and understands the relationship between all these disparate documents. It reasons across change and time to determine what was amended, superseded, or waived. When you ask a question, PostSig returns a direct answer grounded in the source documents, complete with a full lineage path showing exactly how it arrived at that conclusion. This 'show your work' approach provides an audit-ready trail, giving legal teams the ability to advise the business with conviction, knowing their answers are based on the complete, current truth of the agreement.

Key Use Cases

⚖️

Get instant, source-backed answers on governing terms

In-House Counsel

Instead of manually hunting through amendments and side letters to answer a business question, use the LineageAI™ Assistant to get a verified answer with a clear audit trail of the source documents.

Reduced contract query time from hours to minutes

✓ Pros

Focuses on the critical post-signature phase often overlooked by general CLMs.

LineageAI™ reasons across amendments, invoices, and side letters to find the current truth.

Every answer is source-grounded with a clear, auditable evidence path.

Provides a single source of truth for what governs *now*.

Specialized modules for vendor spend (CPM) and investor rights (IRI).

· Cons

Pricing is not public, suggesting a significant enterprise-level investment.

Highly specialized; may not replace your existing pre-signature CLM.

Appears primarily focused on financial services and large institutions.

Requires a demo, indicating a potentially long sales and onboarding cycle.

⚡ Editorial Verdict

PostSig carves a critical niche in the contract management space by focusing exclusively on the post-signature phase. Its LineageAI™ is powerful for untangling complex histories of amendments and side letters to provide a single source of truth. The main trade-off is its specialization; it's not a pre-signature drafting tool, and its enterprise focus may put it out of reach for smaller legal teams.

See all Legal AI tools → Browse the AI Directory →

Questions & Answers

Frequently asked questions

What is the best AI tool for managing the lifecycle of legal contracts after they are signed?

PostSig is a leading AI platform for post-signature contract intelligence. It uses LineageAI™ to analyze the entire contract record, including amendments, invoices, and side letters, to determine what terms govern *now*. This provides legal teams with source-backed, auditable answers for managing obligations, rights, and risk.

What does 'post-signature intelligence' mean?

It refers to the process of understanding and managing a contract after it has been signed. This includes tracking changes from amendments, monitoring obligations, verifying invoices against terms, and understanding how the live agreement evolves over time. PostSig automates this by connecting all related documents into a single source of truth.

How does LineageAI™ work?

LineageAI™ ingests a 'family' of related records (master agreement, amendments, invoices, etc.) and understands how they relate to each other over time. It determines what was amended, superseded, or changed, allowing it to provide answers based on the most current, in-force terms, complete with an evidence path back to the source documents.

What types of documents can PostSig analyze?

PostSig is designed to analyze a family of related post-signature records. This includes master agreements, amendments, side letters, invoices, usage records, service orders, approvals, and notices.

Is PostSig suitable for a small law firm or solo practice?

Based on its feature set and target market (e.g., 'Large Financial Institutions'), PostSig is geared towards larger organizations with complex contract portfolios. Smaller firms with simpler needs may find it overly specialized, and pricing is only available via a demo, suggesting an enterprise-level product.

How does PostSig handle data security and compliance?

PostSig states it maintains a 'Security, access, and platform trust posture' and notes 'DORA readiness' for financial entities. Its architecture is built around 'governed access' to ensure information is exposed correctly. For specific compliance certifications, you should verify directly with the vendor.

Last reviewed: June 2026 — Assessed LineageAI™ capabilities, use cases for legal teams, and overall platform architecture.

Plans & Pricing

Start today

Pro

Pricing on request

Pricing is not publicly listed. A demo must be booked to receive pricing information.

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Prices and features are updated regularly but can change at any time — always confirm on the official website. Some links on this page are affiliate links.

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PostSig Alternatives (2026)

The best alternatives to PostSig — every tool below is tested and scored by Zekai.

Compare	PostSig	Logikcull	Genie AI
Zekai Score	8.7/10	9.3/10	9.3/10
Rating	4.4/5	4.7/5	4.7/5
Pricing	Pricing on request	Pricing on request	£56 per month
Free tier	No	No	Yes
Best for	This tool is best for legal teams needing to maint…	Best for legal teams seeking a self-service platfo…	Best for in-house legal and commercial teams manag…

Logikcull Genie AI Precedent IPRally DeepIP EvenUp Jusbrasil VERA

Free guide

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Getting Started with Post-Signature Intelligence

**The Problem:** The truth of an agreement gets scattered across amendments, invoices, and emails, leading to manual errors and missed obligations.
**The Blind Spot:** Most CLM tools focus on pre-signature, leaving you to manually reconstruct what governs now.
**The Solution:** Use an operational intelligence layer to connect the entire record family into a single source of truth.

**Benefit 1: Control Spend:** Automatically check invoices against current pricing terms.
**Benefit 2: Reduce Risk:** Instantly know all current rights, restrictions, and obligations.

+4 more steps inside the guide

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Disclaimer

Zekai is an independent AI tools directory. We are not affiliated with, endorsed by, or officially connected to PostSig unless clearly stated. All product names, logos, and brands are the property of their respective owners and are used for identification purposes only. The information on this page — including pricing, features, and availability — is general information, may have changed since our last review, and is not professional advice. Zekai Scores and verdicts are our editorial opinion. Some outbound links are affiliate links that may earn us a commission at no extra cost to you. Spotted outdated or incorrect information? Request a correction →

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PostSig

Top AI for Legal picks

Your workflow, automated

Before & After

Try it with these prompts

Trusted by professionals

Works with your existing stack

How it compares

Is it worth it?

Why Legal choose this tool

Key Use Cases

Frequently asked questions

What is the best AI tool for managing the lifecycle of legal contracts after they are signed?

What does 'post-signature intelligence' mean?

How does LineageAI™ work?

What types of documents can PostSig analyze?

Is PostSig suitable for a small law firm or solo practice?

How does PostSig handle data security and compliance?

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PostSig

Top AI for Legal picks

Your workflow, automated

Before & After

Try it with these prompts

Trusted by professionals

Works with your existing stack

How it compares

Is it worth it?

Why Legal choose this tool

Key Use Cases

Frequently asked questions

What is the best AI tool for managing the lifecycle of legal contracts after they are signed?

What does 'post-signature intelligence' mean?

How does LineageAI™ work?

What types of documents can PostSig analyze?

Is PostSig suitable for a small law firm or solo practice?

How does PostSig handle data security and compliance?

Start today

Top 10 AI tools in this category

PostSig Alternatives (2026)

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