Compare / Spellbook
Sandstone vs Spellbook: Drafting Inside Word, or Running the Whole Function?
Spellbook is contract AI built to work inside Microsoft Word — drafting, redlining in tracked changes, clause benchmarking, and playbook checks, for lawyers who spend their week in documents. Sandstone covers the work that never reaches a document: the request in Slack, the question from procurement, the review that arrives as an email forward.
Sandstone vs Spellbook
| Capability | Sandstone |  Spellbook |
|---|---|---|
| Primary focus | AI-native operating system for in-house legal work | AI contract drafting and review inside Microsoft Word |
| Scope of work covered | Every request that reaches legal, contracts included | Contract drafting, review, and redlining |
| Where the work happens | Slack, email, Word, and existing business systems | Microsoft Word |
| Intake and triage | Structured intake with agents that interpret intent and route with context | Review begins in the open document |
| Business context | Counterparty history, prior decisions, and relationships surfaced before work starts, alongside clause benchmarking against market data | Document context plus clause benchmarking across market data |
| Playbooks | Built from your existing contracts and precedent, applied across workflows | Custom negotiating playbooks applied during review |
| Permissions across systems | Permissions mapped across every connected integration | Word add-in permissions |
| Internal collaboration | Legal works a request together in the app or the plugins, with comments and drafts staying behind the scenes until you choose otherwise | Collaboration within the document |
| Best fit for | Teams whose bottleneck is the volume and variety of inbound legal work | Lawyers whose week is drafting and reviewing contracts in Word |
Based on publicly available information as of September 2026. Names and trademarks belong to their respective owners. If anything here is inaccurate or out of date, contact us and we'll update it.
Frequently asked questions
Yes — Sandstone works through plugins in the tools already in place rather than asking anyone to move. The difference is that the request that produced the document, the history behind the counterparty, and the record of how it was resolved all live in the same system rather than being lost once the document closes.
Sandstone redlines against playbooks built from your own contracts, with the attorney in control. If drafting and reviewing in Word genuinely is your whole week, a dedicated Word tool is a reasonable purchase and may be enough on its own. Ask yourself what share of the week that actually is.
Everything around the document. Where the request came from, who asked, what was agreed with that counterparty last time, whether it needed an approval, and how long it took — all held in the same system as the document itself, so the context survives after the file is closed.
Yes. Sandstone benchmarks clauses against external market data as well as against your own precedent and prior positions, so a redline can be argued from both what the market does and what your team has accepted before.
