Stilta
Agentic AI that runs invalidity, infringement, and freedom-to-operate patent analyses with word-for-word source citations.
Stilta aims straight at the failure mode that makes general LLMs unusable in patent work: invented citations. Word-for-word excerpts with one-click jumps into the highlighted passage, plus a reported 100% prior-art recall on its own PTAB IPR benchmark of the latest 40 institution decisions (versus ~18% for general LLMs), are the concrete reasons to shortlist it. The module split — Infringement, Invalidity, FTO — matches how matters actually arrive, and portfolio mode is the piece that separates it from per-matter search tools. It amplifies attorneys rather than replacing them: you define the objective and audit the output. Budget for a demo-led enterprise evaluation, and treat the recall
Verified 4d ago · liveness 59/100 · cite: rightaichoice.com/tools/stilta
- Patent attorneys needing auditable prior art and infringement evidence
- IP litigation teams preparing PTAB IPR proceedings
- Corporate IP departments running portfolio-wide FTO and clearance work
- Patent portfolio managers analyzing thousands of assets without outside search firm costs
- Non-legal professionals wanting casual patent keyword searches
- Teams wanting a fully automated answer with no attorney review step
- Matters where a flat ranked reference list is all you need
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Skip Stilta if you want a casual patent keyword search or a fully automated answer you can file without an attorney reviewing and auditing the evidence first.
Stilta's pricing fits teams whose volume aligns with the published tiers. Compare against the alternatives listed below for stage-specific value.
In short
Stilta — Agentic AI that runs invalidity, infringement, and freedom-to-operate patent analyses with word-for-word source citations. Best for Patent attorneys needing auditable prior art and infringement evidence, IP litigation teams preparing PTAB IPR proceedings, Corporate IP departments running portfolio-wide FTO and clearance work. Contact Sales pricing.
What people actually say about Stilta — is it worth it?
We ran a structured research pass across product reviews, community discussions, and post-purchase forum threads to surface the patterns vendors won't publish themselves. Below: the recurring strengths, the hidden costs people mention most, and the cohort that consistently regrets adopting this tool.
19 mentions across 1 source (YouTube) · researched Sep 1, 2026.
Average across the 1 source that answered — each source counts once, not each post.
- +Purpose-built for patent attorneys, not generic LLMs. (claim)
- +Claims 100% prior-art recall on PTAB IPR benchmarks. (claim)
- +Source-cited evidence with one-click links to original passages. (claimed feature)
- +Reads full-text patents, not just abstracts, reducing hallucination risk. (claimed feature)
- +Enterprise security: SOC 2, ISO 27001, per-tenant isolation, zero training on user data. (claimed feature)
- −Zero community reviews or independent tests to verify claims.
- −Brand-name collision with Stila Cosmetics dominates YouTube search results.
- −No public pricing, no free trial, hard to evaluate ROI.
- −No user forums or community support visible.
- −All positive features are claimed, not confirmed by real users.
- • Unknown implementation or onboarding fees
- • May require annual contracts without a way to test first
- • Potential overage charges for large portfolio analyses
Viability Score
How well maintained and how widely used is Stilta? Built from what the vendor actually publishes (docs, changelog, tutorials, integrations, pricing), whether the site is live, and how much real users discuss it. How we calculate this
Last calculated: October 2026
How we score →Key Features
- Invalidity analysis across 180M+ patents in 100+ jurisdictions
- Infringement analysis with element-by-element claim mapping
- Freedom-to-operate analysis with feature decomposition and risk scoring
- Steerable prior art search attorneys can direct, not a flat reference list
- Portfolio mode analyzing thousands of patents at once
- Single-patent mode for one matter at a time
- Source-cited evidence with one-click jumps to highlighted passages in the original
- Domain agents read full-text patents, not just titles and abstracts
- Scientific literature search covering 250M+ publications
- Internet Archive search back to the 1990s
- Live patent index refreshed daily
- Defensible first draft in about 17 minutes median runtime
- Risk ranking per feature from cleared to high-risk
- Zero AI training on customer data with per-tenant isolation
- SAML SSO, audit logs, encryption in transit and at rest
About Stilta
Stilta is an agentic AI platform for patent attorneys, IP litigation teams, and in-house IP departments working under deadline on high-stakes matters. You bring the patent, the target product, the portfolio, or the matter context; domain agents scope the work, search patents, scientific literature, file wrappers, and archived web pages in parallel, then map evidence element-by-element to each claim element. Output is a claim chart, FTO opinion, or infringement read you can open, audit, and defend. Three featured modules cover the main jobs: Infringement Analysis (single-patent or portfolio mode, mapping product specifications, manuals, marketing materials, press releases and regulatory filings against your claims), Invalidity Analysis (steerable prior art search you direct rather than accept as a flat reference list, spanning 180M+ patents across 100+ jurisdictions, journals and standards, and Internet Archive pages back to the 1990s), and Freedom to Operate (agent-driven feature decomposition with each feature scored from cleared to high-risk and traceable evidence attached). Stilta reports word-for-word source excerpts with one click to the highlighted passage in the original, a median runtime of about 17 minutes to a first draft, and 100% prior-art recall on its own PTAB IPR benchmark across the latest 40 institution decisions, against roughly 18% for general LLMs. On May 19, 2026 Stilta announced a $10.5M round led by Andreessen Horowitz, with Microsoft and Y Combinator backing, and says it is trusted by 50+ IP teams including KUKA, Bergenstråhle, Mannheimer Swartling and ex-Spotify IP leadership. The difference from ChatGPT or Claude is domain agents plus legal-grade security: per-tenant isolation, zero AI training on your data, US or EU data residency, SAML SSO, audit logs, encryption in transit and at rest, SOC 2 Type II, ISO 27001, GDPR, and EU AI Act alignment.
Behind the Verdict
Where Stilta earns its keep is evidence traceability. Every excerpt is word-for-word from the source with one click to the highlighted passage in the original document, and agents read full-text patents rather than titles and abstracts — that combination is what makes output defensible in an invalidity contention or an FTO opinion instead of merely suggestive. The three modules are shaped by the job rather than by data source: Invalidity Analysis is steerable, so you can direct hypotheses instead of accepting a flat reference list; Infringement Analysis maps product specifications, manuals, marketing materials, press releases and regulatory filings element-by-element against your claims, in single-patent or portfolio mode; Freedom to Operate decomposes your product or planned launch into features and scores each one from cleared to high-risk with evidence attached. Coverage is broad on paper — 180M+ patents across 100+ jurisdictions on a live index refreshed daily, plus 250M+ scientific publications and archived web content back to 1995 — and the archived-web layer is the part that catches evidence most tools never reach. Reported throughput is a defensible first draft in about 17 minutes, with customers citing evidence on more than two patents in a single day (Per Wendin, ex-Head of IP at Spotify). KUKA's Head of IP & Legal R&D says the major parts of IP management were integrated within a few months and the team generates competitor and infringement reports across teams. The honest limits: attorneys must still define objectives and audit outputs, portfolio mode is where the value concentrates so single-matter users get less leverage, and the recall claim comes from Stilta's own benchmark study, not a neutral third party. Enterprise controls are in place for regulated buyers — per-tenant isolation, zero training on your data, US or EU data residency, SAML SSO, audit logs, encryption in transit and at rest, SOC 2 Type II, ISO 27001, GDPR, EU AI Act alignment — which is the gate most legal departments will apply first. With $10.5M led by a16z and Microsoft and Y Combinator backing announced May 19, 2026, the company has runway to keep expanding the index and the agent set. If your team runs validity, infringement, or clearance work at volume, this belongs on the shortlist next to incumbent patent search providers; if you need a casual keyword lookup, it is the wrong shape entirely.
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Real-world workflow fit
Concrete scenarios for the personas Stilta actually fits — and what changes day-one when you adopt it.
You paste the patent and the matter context into Invalidity Analysis, steer the agent toward the prior art hypotheses you already suspect, and let it search patents, journals, file wrappers and archived web in parallel. It maps each claim element to word-for-word excerpts with one-click links to the highlighted passages.
Outcome: You get a cited invalidity draft in about 17 minutes instead of days of searching, and you spend your time deciding which references actually carry the argument rather than hunting for them.
You describe the planned launch in Freedom to Operate, which decomposes it into features and surfaces potentially infringed patents ranked by risk, attaching traceable evidence per feature.
Outcome: You walk into the go/no-go meeting with each feature labelled from cleared to high-risk and a source behind every flag, so design-around decisions get made before launch rather than after a letter arrives.
You point the portfolio mode at thousands of assets at once and have agents read full-text patents across jurisdictions plus scientific literature and archived web pages back to 1995.
Outcome: You get a ranked, source-cited view across the portfolio — the kind of sweep that previously meant outside search firm spend and weeks of calendar time.
Use Cases
- Run an invalidity search to defend against an infringement letter.
- Map a competitor's product specifications and public disclosures against your claims.
- Assess freedom to operate before launching a new product or product line.
- Audit portfolio strength using prior art from patents, literature and archived web.
- Prepare claim charts with source citations for PTAB IPR proceedings.
- Run portfolio-wide FTO clearance checks across a product line.
- Generate competitor and infringement reports across teams, as KUKA does.
- Test a specific prior art hypothesis by steering the agent's search direction.
Limitations
- Stilta requires attorneys to define the objective and audit every output; it augments professional judgment rather than replacing it.
- The reported 100% prior-art recall figure comes from Stilta's own PTAB IPR benchmark across the latest 40 institution decisions, not from an independent study, so treat it as vendor-published.
- Value concentrates in portfolio mode and multi-matter workflows, which means single-matter users get less leverage from the agent stack.
- The product is delivered as a web application reached through a browser with login.
- Output still needs a qualified attorney to review before it is filed or relied on in a matter.
as of 2026-10-03
Verification history
We have re-verified Stilta 8 times since . Each pass re-reads the vendor's own pages and re-checks every listed field against that evidence; passes where nothing had changed are marked as such.
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-checked, vendor evidence unchanged
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-checked, vendor evidence unchanged
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
Showing the 6 most recent of 8 verification passes.
Free to cite with attribution — this page re-verifies continuously.
Where the pricing makes sense
The company stage and team size where Stilta's pricing actually pencils out — and where peers do it cheaper.
Stilta's pricing fits teams whose volume aligns with the published tiers. Compare against the alternatives listed below for stage-specific value.
Setup time & first value
How long it actually takes to get something useful out of Stilta — broken out by persona, not the marketing-page minute.
Setup time varies by use case. Solo users typically reach first value within an hour; teams should budget half a day for shared setup including integrations and access controls.
Resources & Guides
Tutorials & Learning
YouTube returned 6 videos for “Stilta”, and we withheld 6: 6 could not be judged, because “Stilta” is a single word that other videos use for other things. We are showing none, because we could not prove any of them are about Stilta.
Official links
Tools that pair well with Stilta
Common stack mates teams adopt alongside Stilta, with the specific reason each pairing earns its keep.
&AI (YC S24)
AI workspace for patent litigation: prior art search, claim charts, invalidity analysis, and infringement detection
Patent Watch
Source-backed AI claim charting, SEP mapping, and prior-art and validity review for patent and IP teams.
Litmas AI
Litmas AI reads your full case file, maps facts to claim elements, and drafts court-ready motions with source-linked citations.
Featured Head-to-Head Comparisons
Semantic Scholar vs Stilta
Don't let the 'AI search' label fool you — Stilta and Semantic Scholar serve completely different jobs. If you're a patent attorney needing defensible invalidity or infringement analysis, Stilta's agentic search with 100% prior-art recall is essential (but costs enterprise money). If you're a researcher or student exploring 236M+ papers, Semantic Scholar is unbeatable at free. Pick the tool that matches your workflow, not the category.
Stilta vs Surge Ai
Choose Stilta if you're a patent attorney needing rapid, defensible prior art with guaranteed high recall. Choose Surge AI if you're an AI lab or safety team requiring expert human feedback to align frontier models. They serve entirely different jobs—one automates patent search, the other provides human judgment for AI training.
Stilta vs Praktika
Praktika and Stilta serve completely different needs—one is a mobile app for language speaking practice, the other an enterprise AI platform for patent law. There's no direct competition. Choose based on your domain: if you're an intermediate learner wanting fluent conversation, pick Praktika; if you're a patent attorney needing rapid, defensible prior art searches, choose Stilta.
Alternatives to Stilta
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&AI (YC S24)
AI workspace for patent litigation: prior art search, claim charts, invalidity analysis, and infringement detection
Patent Watch
Source-backed AI claim charting, SEP mapping, and prior-art and validity review for patent and IP teams.
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