ClauseGuard is an AI-powered contract review platform that analyzes legal agreements for hidden risks, missing clauses, and one-sided terms in 90 seconds. It provides automatic risk scoring, clause-by-clause analysis with market-standard comparisons, and AI-generated redline suggestions in three negotiation tones.
Spellbook: Spellbook is an AI contract drafting and review tool built as a Microsoft Word add-in. It uses OpenAI GPT-4 and is aimed at law firms and legal departments. Pricing requires a demo call with no public pricing.
VERDICT
ClauseGuard wins on features and transparency
Spellbook is a capable Word add-in for lawyers, but it requires a sales call, has no public pricing, and lacks several features ClauseGuard offers out of the box: negotiation simulator, 3-tone redlines, obligation tracking, contract comparison, batch upload, portfolio dashboard, and a developer API. ClauseGuard is transparent — $99/month for Pro, $199/month for Business — and you can start in 30 seconds without talking to sales.
Choose ClauseGuard when:
- ✓You want transparent pricing without a sales call
- ✓You need a risk score and structured severity analysis, not just flagged issues
- ✓You want negotiation simulation that predicts counterparty responses
- ✓You manage multiple contracts and need portfolio-level analytics
- ✓You want obligation tracking with automated deadline alerts
- ✓You need to compare contracts side-by-side
- ✓You want API access for programmatic integration
- ✓You work with contracts in PDF format, not just Word
Choose Spellbook when:
- →You work exclusively in Microsoft Word and want inline editing without leaving the app
- →You are a law firm that drafts contracts from scratch and needs real-time suggestions while typing
- →Your organization has an enterprise budget and prefers a sales-led purchase process
Frequently asked questions
Is ClauseGuard more affordable than Spellbook?
ClauseGuard offers transparent pricing: free first analysis, $5 per contract on pay-per-use, $99/month for unlimited Pro, $199/month for Business with team and API access. Spellbook does not publish pricing and requires a sales demo. Based on industry reports, Spellbook pricing typically starts at $300-500/month per user.
Can ClauseGuard replace Spellbook?
For contract review and risk analysis, ClauseGuard offers more features at a lower price point. The main advantage Spellbook has is its native Word integration for real-time contract drafting. If your primary workflow is reviewing existing contracts (not drafting from scratch), ClauseGuard is the stronger choice.
Does ClauseGuard work with Word documents?
Yes. ClauseGuard accepts both PDF and DOCX uploads, and exports analysis results as a Word document with tracked changes that you can send directly to the counterparty. A native Word add-in is also in development.
Which tool has better AI for contract analysis?
ClauseGuard uses a multi-stage Anthropic Claude pipeline specifically calibrated for legal documents, with semantic chunking, parallel analysis, and structured output. Spellbook uses OpenAI GPT-4. Both are capable, but ClauseGuard's pipeline is purpose-built for consistent, structured contract analysis rather than general-purpose text generation.
Try ClauseGuard free
Upload any contract and get a risk score, clause-by-clause analysis, and AI-generated redlines in 90 seconds. No account required.