AI-Powered Signing
AI Word Add-in
Spellbook is an excellent tool for AI contract drafting and review inside Microsoft Word. Zignature is the AI-native platform that handles everything else: AI field detection, legally binding signatures, CRM automation, and post-signing workflows.
Spellbook helps you write. Zignature helps you sign. Here is how they compare across the full document lifecycle.
| Capability | ![]() |
Spellbook |
|---|---|---|
| Drafting & Review | ||
| AI Clause Review | ✓ Included | ✓ Primary Focus |
| Native Word Add-in | Browser-based builder | |
| Signing & Automation | ||
| Legally Binding E-Signatures | ||
| AI Field Detection (Auto-Mapping) | ||
| CRM Automation Rules | ||
| Enterprise & Pricing | ||
| Free Plan Available | Yes (Unlimited docs) | Paid only |
| Starting Price | $0 / month | $49 / user / month |
Spellbook and Zignature often live in the same tech stack. Here is when Zignature is the right tool for the job.
Spellbook assists in the drafting phase, but it does not collect signatures. Zignature provides the court-admissible audit trail, digital certificates, and secure signing environment required for legal execution.
While Spellbook lives in Word, Zignature lives in your CRM. With our Chrome extension, you can sign and send contracts directly from Salesforce, HubSpot, or Pipedrive without ever leaving the deal page.
Zignature's AI doesn't just review text; it automates your business. Trigger Slack notifications, update CRM fields, or send follow-up emails automatically as soon as a document is signed.
Imagine a legal team at a fast-growing tech company. They receive a 40-page master service agreement (MSA) from a major enterprise client. The legal counsel opens the document in Microsoft Word and uses Spellbook to instantly flag high-risk indemnity clauses and suggest language that aligns with their company's risk profile. Within 15 minutes, the redlining is done—a task that previously would have taken hours of manual review.
Once the negotiations are finalized, the operational side of the business takes over. The sales ops manager uploads the final Word document to Zignature. Instantly, Zignature's AI field detection identifies every place where a signature, date, or title is required, mapping them to the correct recipients. Instead of manually dragging and dropping 20 different fields, the manager clicks "Send" in seconds.
As soon as the client signs, Zignature triggers an automation rule that updates the "Contract Status" field in Salesforce to "Signed," moves the deal to "Closed-Won," and posts a celebratory message in the sales Slack channel. The signed PDF, complete with a secure audit trail, is automatically filed in the company's cloud storage. By using Spellbook for the "writing" and Zignature for the "signing," the team has created a 100% AI-powered document lifecycle.
If you're currently using Spellbook for drafting but still relying on expensive, legacy e-signature tools like DocuSign or Adobe Sign, you are overpaying for basic execution.
Starter
Templates & Reminders
$12
/mo
Professional
API & CRM Integration
$29
/mo
Business
SSO & White-label
$79
/mo
Join thousands of teams using Zignature to combine the power of AI with the efficiency of modern e-signatures.