Spellbook vs Robin AI vs Ironclad: Real AI Contract Review Cost
Short answer
The most important fact in this comparison isn't a price — it's that one of the three vendors named in it doesn't really operate as an independent going concern anymore, though the details of exactly what happened to it are worth getting right rather than oversimplifying. Robin AI, once a well-funded UK legal AI startup, went through a distressed sale in late 2025/early 2026. Its managed-services business was acquired by Scissero in December 2025; separately, in January 2026, Microsoft hired a group of Robin AI's engineers to help build legal AI features into Word — described in reporting as an acqui-hire of talent, not a purchase of the company or its software. Robin AI's standalone contract-review-and-drafting software product itself was reportedly not part of either transaction, and public reporting does not confirm who currently operates or supports it — though one financial-data aggregator's record of the events differs from the more detailed narrative reporting, a discrepancy addressed below. Spellbook and Ironclad are both still active, but both are also fully quote-only — neither publishes a rate card, and every dollar figure available for either comes from reported deals and third-party pricing trackers, not an official price list.
What actually happened to Robin AI, and is its software still usable?
The most reliable, detailed reporting on Robin AI's wind-down describes two separate transactions, neither of which was a straightforward company acquisition. In December 2025, Scissero — a UK legal services provider — acquired Robin AI's managed-services business specifically, bringing over roughly 75 staff including its VP of legal and global head of legal. In January 2026, Microsoft separately hired a number of Robin AI's engineers and AI specialists, reported as a talent acqui-hire intended to strengthen legal AI capability inside Microsoft Word, with Microsoft stating it had no plans to acquire Robin AI or its remaining software as a company purchase. Multiple sources specifically note that Robin AI's contract-review-and-drafting software — the actual product a buyer would be comparing against Spellbook or Ironclad — was not part of either deal.
A genuine discrepancy worth flagging rather than picking a side on: at least one financial-data aggregator's company-profile record describes the outcome differently, logging a full acquisition of Robin AI by Microsoft on a specific date in early 2026. This conflicts with the more detailed, narrative reporting from legal-industry trade press, which consistently describes Microsoft's involvement as a hiring decision rather than a company or software acquisition. This article has not resolved that discrepancy — it's presented here so a reader relying on either source knows the other account exists.
What this means practically: available public reporting does not identify a current operator providing ongoing updates, support, or data protection for Robin AI's standalone software product specifically. Whether that means the software has been fully discontinued, is running unsupported, or is being quietly maintained by some party not covered in available reporting could not be established with confidence — the available evidence does not support a definitive "no owner" or "discontinued" conclusion. For reference, Robin AI's last publicly known pricing structure offered a free tier (one user, up to 10 messages/day) and a Pro tier that required a 5-user minimum even for a solo practitioner working alone — but this describes a structure that predates the wind-down and should not be assumed still purchasable. If Robin AI's approach or price point is what appealed to you, treat this article's mention of it as a snapshot of a company in transition, and verify its current status directly before relying on it.
Pricing at a glance (Spellbook and Ironclad — both quote-only)
| Spellbook | Ironclad | |
|---|---|---|
| Public rate card | None — sales-gated, no dollar figure on its own pricing page | None — quote required |
| Reported per-seat price | ~$500/user/month is the figure most third-party benchmarks converge on, though this comes with real caveats (see below) | Not typically quoted per-seat; reported as a total contract range instead |
| Reported total contract range | Median reported contract: ~$25,470/year, based on a small sample of buyer-reported purchases | ~$30,000–250,000+/year total, reported |
| AI-specific add-on | Not applicable — Spellbook's AI drafting/redlining/benchmarking features are included in the base seat price, not sold as a separate module | AI Contract Analysis is a separate paid module, reportedly adding another $50,000–100,000/year on top of the base platform cost |
| Billing cadence | Annual is standard; monthly billing reportedly available at roughly a 20% uplift | Not specified in available sources |
| What it actually is | A Microsoft Word add-in for AI-assisted drafting, redlining, and clause benchmarking — not a full contract-lifecycle platform | A full contract-lifecycle management (CLM) platform — intake, approvals, e-signature, repository — with AI layered on as an add-on, not the core product |
A real caveat on that $500/seat Spellbook figure: it's the number one detailed pricing analysis settled on after finding that some other third-party trackers publish materially lower tiered estimates, which that analysis treated as lower-confidence and set aside. Other benchmarks report a lower median (the ~$25,470/year figure above, based on a handful of buyer reports) that doesn't cleanly divide into a $500/seat number unless the license covers relatively few seats. These two reported figures don't fully reconcile with each other, and neither is confirmed by Spellbook directly.
What Spellbook and Ironclad are actually solving — and why comparing them head-to-head on price alone is misleading
Spellbook and Ironclad aren't really competing products. Spellbook lives inside Microsoft Word and is built for drafting-heavy, redlining-heavy work by people actively writing and negotiating contract language. Ironclad manages the full contract lifecycle — intake, routing, approvals, e-signature, and the repository afterward — with AI as one module layered on top of a much bigger workflow platform. A team evaluating "which is cheaper" without first deciding which job it actually needs done is likely to end up with the wrong tool regardless of price.
Hidden costs
- Ironclad's AI Contract Analysis module is priced and sold separately from the base CLM platform — the reported $30,000–250,000+/year range for Ironclad overall does not automatically include AI capability; the reported $50,000–100,000/year AI add-on is on top of that base range, not inside it.
- Ironclad has reportedly been raising renewal rates materially — a detail worth pressing on directly during any negotiation, and worth asking for a contractual renewal cap up front rather than discovering the increase at renewal time.
- Spellbook's core product only covers work done inside Microsoft Word. A team that needs AI contract capability outside Word — in a browser-based repository, in a procurement workflow, in a full CLM — needs a different product (Spellbook's own materials point toward Ironclad, Bind, or similar full-CLM platforms for that use case) rather than expecting Spellbook to expand to cover it.
- Both vendors' standard contracts are annual, with month-to-month options, where available, carrying a real premium (reportedly around 20% for Spellbook specifically).
Worked scenarios
Every figure below is a reported or third-party-estimated range, not an official quote — treat these as a starting point for your own negotiation, not a number to expect unchanged.
Founder reviewing 20 contracts/month
At this volume, a single Spellbook seat is the most directly relevant option of the two active vendors — Ironclad's full-CLM approach, with its reported $30,000+/year floor, is generally overbuilt and overpriced for a single person's contract review workload. Using the reported ~$500/month per-seat figure: roughly $6,000/year for one Spellbook seat, though the lower reported median contract figure (~$25,470/year, likely reflecting multi-seat accounts in that sample) suggests actual single-seat pricing could differ meaningfully from a simple $500 × 12 calculation. A direct quote is the only way to know for sure at this scale.
5-person legal team
| Estimated annual cost | |
|---|---|
| Spellbook (reported ~$500/seat/month) | 5 × $500 × 12 = $30,000/year (reported estimate) |
| Ironclad (reported total-contract range, lower end) | $30,000/year or more, before the separate AI module |
At this team size, the reported numbers for Spellbook and Ironclad's base platform happen to land in a similar range — but they're buying fundamentally different things for that money: Spellbook buys five Word-based drafting seats, while Ironclad's reported floor buys a full contract-lifecycle platform without AI analysis included. Adding Ironclad's reported AI module ($50,000–100,000/year) would push Ironclad's total well above Spellbook's reported cost at this team size.
50-person legal/procurement team
| Estimated annual cost | |
|---|---|
| Spellbook (reported ~$500/seat/month) | 50 × $500 × 12 = $300,000/year (reported estimate) — though per-seat pricing is reported to compress somewhat at higher seat counts, so the true figure may be lower |
| Ironclad (reported total-contract range, higher end, plus AI module) | Up to $250,000+/year platform, plus $50,000–100,000/year AI module = potentially $300,000–350,000+/year |
At this scale, both vendors land in a broadly similar six-figure range in reported figures — though Ironclad's number reflects a full-CLM platform covering intake-through-signature for a much larger workflow than Spellbook's drafting-focused seat, which makes a pure dollar comparison somewhat misleading without also weighing what each platform actually does for a 50-person team's full contract lifecycle versus just the drafting stage of it.
Break-even and crossover
There isn't a clean, calculable crossover here the way there is in categories with published rate cards — both vendors are quote-only, and the reported figures for each come from different sample sizes and methodologies that don't reconcile precisely with each other. The more useful framing than a dollar crossover: Spellbook makes sense when the job is specifically drafting and redlining inside Word; Ironclad makes sense when the job is managing a full contract lifecycle with many stakeholders and approval steps. A team trying to solve the second problem with Spellbook, or the first with Ironclad's heavier full-CLM approach, is likely to overpay relative to what it actually needs, regardless of which vendor's reported price looks lower on paper.
Who pays more, and when
- A solo practitioner or very small team doing primarily drafting and redlining work should look at Spellbook, not Ironclad — Ironclad's reported pricing floor and full-CLM feature set are built for a scale and workflow this segment doesn't have.
- A team specifically needing full contract-lifecycle management (intake, multi-party approvals, e-signature, repository) needs Ironclad or a similar full-CLM platform regardless of price, since Spellbook doesn't attempt to cover that workflow at all.
- A team evaluating Ironclad specifically for its AI capability should ask for AI Contract Analysis pricing separately and up front — it's reportedly a substantial additional cost on top of the base platform, not something bundled into the headline contract-value range.
- Anyone who was specifically drawn to Robin AI's low historical price point should treat that option as no longer available and evaluate Spellbook, Ironclad, or another active platform on its own current merits instead.
Limitations and uncertainty
Every dollar figure for Spellbook and Ironclad in this article is reported or third-party-estimated — neither vendor publishes pricing, and this article has not resolved the disagreement between competing third-party estimates (for instance, Spellbook's ~$500/seat/month figure versus its ~$25,470/year median-contract figure, which don't cleanly reconcile). Robin AI's current corporate and product status is presented here as accurately as available public information allows, but given the company is mid-wind-down, its exact status may continue to change. Anyone evaluating any of these three options should get a current, written quote rather than relying on the figures here.
Official sources
Spellbook and Ironclad do not publish pricing; the figures in this article are drawn from multiple independent third-party pricing benchmarks and buyer-reported data, none of which individually constitutes an official vendor source. Robin AI's status is drawn from legal-industry trade press reporting on its December 2025 managed-services sale to Scissero and its January 2026 engineering-team acqui-hire by Microsoft, alongside one conflicting financial-data-aggregator record described above.