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TL;DR: Discovery has two sides, and most "best AI" lists only think about one. Propounding interrogatories (the questions you send out) is a different job than answering the ones that land on your desk, and the tools below don't all do both. ProPlaintiff is our pick for the best AI for creating interrogatories at plaintiff and PI firms, since its document generator and AI paralegal work straight from the case file on both sides of that exchange. Eve and EvenUp cover similar ground for plaintiff practices. Briefpoint is the one true discovery specialist here, built for firms of any stripe that live and die by written discovery volume. CoCounsel Legal helps you plan discovery and dig through case documents, though it stops short of drafting the interrogatories themselves. Whatever drafts the first pass, a lawyer still checks relevance, privilege, objections, and jurisdictional limits before anything gets served.
Written discovery is repetitive in structure and stubborn in substance. The format barely changes case to case; the facts behind it change every time. A generic interrogatory bank saves you nothing once you factor in the rewriting. Responding is worse: someone has to comb the file, chase the client for what isn't there yet, draft objections that will actually hold up, and keep every answer consistent with the complaint, the medical records, and whatever's already been said in a deposition.
That's the job AI is being sold to fix. How well six platforms actually do it, split by whether they send discovery, answer it, or both, is what the rest of this piece walks through. If you've already read our breakdowns of AI pleading software or AI motion drafting tools, the evaluation logic will feel familiar; the products that pass the bar here aren't always the same ones.
It's software that uses case-specific information to help a legal team write interrogatories, respond to them, or both. Interrogatories are written questions served during discovery; the party that receives them has to answer in writing, under oath, usually within a set window.
Two different jobs hide under one word:
A platform that's good at one isn't automatically good at the other, and plenty of general legal-drafting tools aren't built for either. Writing a solid demand letter and running a structured discovery workflow are not the same skill, no matter how a sales page frames it.
The bar isn't "produces interrogatories." Standard sets exist everywhere for free. The bar is whether the tool builds questions around this case: the allegations, the injuries, the insurance picture, the named witnesses, the specific defense raised. Anything less is a form with your client's name typed in.
Some platforms only propound. Others only respond. The strongest workflow covers the full loop: send, receive, search the file, draft an answer. Eve, EvenUp, Briefpoint, and CoCounsel each describe capability somewhere in that loop; how much of it, and how well, is where they actually separate from each other.
For responses especially, a tool needs to pull from pleadings, medical records, incident reports, prior discovery, and client correspondence, not just the interrogatory text itself. ProPlaintiff's paralegal, Tiff, is a useful example of what this looks like done well: it searches connected case files and cites the exact source behind each answer, so nothing is asserted without something to point to.
A handful of platforms surface potential objections (relevance, overbreadth, privilege, undue burden) for the attorney to weigh. None of them get to decide an objection is valid. That call depends on the jurisdiction, the judge, and the record, and it stays with the lawyer.
This might be the single most useful feature in the category: separating what's already sitting in the case file from what genuinely has to come from the client. A tool that can't tell the difference will either invent an answer or leave a blank where a real one belongs.
Someone still has to ask the client for the missing pieces. Briefpoint's Bridge workflow is the clearest example of a platform solving this directly: it sends plain-language questions to the client, collects what comes back, and drops it into the draft.
Interrogatories rarely travel alone. If a platform handles written discovery well, it usually handles requests for admission and requests for production in the same breath.
Discovery responses often mean uploading medical records, correspondence, and other material a client would not want mishandled. Ask directly about retention, encryption, and whether your data trains anyone's model, and don't take a badge on a marketing page at face value. Our HIPAA-compliant legal AI and SOC 2-compliant legal software guides walk through what to actually confirm.
Six names show up when people search for the best AI for creating interrogatories: ProPlaintiff, Eve, EvenUp, Briefpoint, CoCounsel Legal, and Harvey. Short version: ProPlaintiff, Eve, and EvenUp all grew up inside plaintiff practice, so this exact job is what they're for. Briefpoint is the specialist that does written discovery and nothing but. CoCounsel and Harvey are broader litigation platforms where discovery is one piece of a much bigger product, not the reason to buy.
Fits: Plaintiff and PI firms that want interrogatories and discovery responses tied to the same case file they already use for everything else.
ProPlaintiff's document generator lists interrogatories by name, described on-site as "standard and custom discovery questions tailored to your case type," alongside pleadings and discovery requests. The heavier lift happens through its AI paralegal, Tiff, which searches your connected case files and answers with citations back to the source, described on-site as grounded "in your case files, not hallucinated facts." One of its listed draft prompts is close to verbatim what a paralegal would type: "write a response to this interrogatory using case facts."
What it does well: the drafting and the response work pull from the same case record your firm uses for demands and medical chronologies, so nothing lives in a separate silo.
Where it's thinner: if written discovery volume is your firm's whole bottleneck, a dedicated specialist like Briefpoint is worth comparing directly.
Pick it when: you want interrogatory drafting and responses running off the same case data as the rest of the file, not a bolted-on discovery app.
Ask Tiff to draft a response using the facts already sitting in the case, then decide what to send. See the workflow.
Fits: Plaintiff firms that want one platform for both sending and answering written discovery.
Eve splits this cleanly into two products. On the propounding side, it drafts "interrogatories aimed at uncovering the crucial facts," plus requests for admission and document requests, from whatever's been uploaded. On the response side, it pulls answers from "medical records, intake notes, police reports," drafts the response, and flags objection opportunities directly in the draft. Eve's own framing: what's normally a multi-day task takes about 45 minutes.
What it does well: genuinely two-sided, with objection flagging built into the response side rather than tacked on.
Where it's thinner: it's part of a much wider litigation platform, so confirm current scope and terms directly since Eve doesn't publish pricing.
Pick it when: your firm wants discovery handled inside the same system as the rest of its plaintiff litigation work, not a standalone app.
Fits: PI firms that want outbound and inbound discovery split into purpose-built products rather than one blended tool.
EvenUp's Discovery product generates interrogatories, RFAs, and RFPs "aligned to case facts," applies firm-standard objections automatically, and validates responses against the record. Its separate AI Drafts product, run on EvenUp's Piai model, handles the response side specifically: interrogatory responses, RFA responses, and RFP responses, built from selected case files.
What it does well: clean separation between the outbound tool and the response tool, both anchored to the case record rather than a template.
Where it's thinner: confirm which product covers which half of your workflow before assuming one tool does everything; the propounding side and response side aren't the same product.
Pick it when: discovery drafting needs to sit inside a broader PI case-document platform rather than stand alone.
Fits: Any firm, plaintiff or defense, whose real bottleneck is written discovery volume.
Briefpoint doesn't do medical chronologies or demand letters. It does interrogatories, RFAs, and RFPs, in both request and response format, and treats that as the whole job rather than a feature. The platform can generate more than 70 targeted requests from a set of allegations, applies firm-specific objection strategies through what it calls Discovery Playbooks, and formats output for all 50 states plus federal court. Its Bridge workflow sends plain-language questions to clients and folds their answers back into the draft, complete with page-level citations. Pricing is public: a flat $150 per attorney, per month, billed annually, with no per-case fees.
What it does well: depth. Nothing else on this list is built this specifically around one task.
Where it's thinner: it's discovery and only discovery. If your firm wants one platform for demands, chronologies, and pleadings too, this isn't that.
Pick it when: written discovery is the bottleneck itself, not a side task inside a bigger case-management need.
Fits: Litigation teams already inside Thomson Reuters' research ecosystem who want help scoping discovery, not drafting interrogatories directly.
Here's where honesty matters more than the sales pitch: CoCounsel's civil litigation product builds "targeted discovery plans from pleadings" by pulling claims, defenses, key issues, custodians, and time frames out of uploaded complaints and answers. That's discovery planning. We found no confirmed feature that drafts interrogatories, RFAs, RFPs, or discovery responses, despite what some comparisons assume. What is confirmed: motion practice support, deposition-outline drafting, and citation verification through its Litigation Document Analyzer.
What it does well: turning pleadings into a structured discovery plan, inside a research environment your team may already trust.
Where it's thinner: it doesn't currently draft the interrogatories themselves, at least not in any way Thomson Reuters documents publicly. Confirm this directly before assuming otherwise.
Pick it when: you need discovery scoping and legal research in the same platform, and you're prepared to draft the actual interrogatories elsewhere.
Fits: Large or multi-practice litigation teams who want one AI platform across research, drafting, and document review, not a discovery-request generator.
Harvey's discovery functionality, as documented on its own site, is document review and organization: sorting large document sets, analyzing depositions and expert material, organizing what's already there. That's a real and useful capability. It is not interrogatory drafting, and we found nothing on Harvey's site claiming otherwise.
What it does well: heavyweight document review across huge discovery sets, inside a platform that also handles research and general litigation drafting.
Where it's thinner: don't buy Harvey expecting it to write your interrogatories. Nothing we found supports that specific claim.
Pick it when: your firm needs enterprise-scale litigation AI broadly, and discovery-request drafting was never the deciding feature to begin with.
Tool | Best Fit | Plaintiff-Specific | Drafts Interrogatories (Outbound) | Drafts Responses (Inbound) | Objection Support | RFAs / RFPs |
ProPlaintiff | Plaintiff & PI firms | Yes | Yes | Yes | Case-by-case | Via document library |
Eve | Plaintiff, both directions | Yes | Yes | Yes | Yes | Yes |
EvenUp | Plaintiff, split by product | Yes | Yes (Discovery) | Yes (AI Drafts) | Yes | Yes |
Briefpoint | Discovery specialist, any side | No | Yes | Yes | Yes | Yes |
CoCounsel Legal | Discovery planning + research | No | Not confirmed | Not confirmed | Not confirmed | Not confirmed |
Harvey | Enterprise document review | No | No | Document review only | No | No |
If you're a plaintiff firm, start with ProPlaintiff, Eve, and EvenUp side by side. If written discovery volume alone is the problem, put Briefpoint on the shortlist regardless of which side of the case you sit on. CoCounsel and Harvey earn a look only if broader research or document-review scale matters more to you than interrogatory drafting itself. Either way, this table is the fastest way to see which platform actually qualifies as AI for creating interrogatories versus one that just touches discovery in passing.
Sending discovery starts before any software opens.
Answering discovery is where the real time sink usually lives, and it splits into its own sequence.
Import the requests. The system separates the discovery document into individual interrogatories it can work against one at a time.
Search everything. Intake records, medical files, employment documents, correspondence, prior statements: the wider the search, the fewer blanks left over.
Draft what's answerable. Where the file already has the fact, a decent tool produces a usable first answer.
Flag what isn't. This is the feature that actually saves hours: knowing which questions still need a call to the client, instead of guessing or leaving a gap someone finds later.
Surface possible objections. The system proposes; the attorney decides whether an objection actually holds up under the applicable rules.
Check for contradictions. Cross-reference the draft against the complaint, the medical chronology, prior discovery, and anything said in a deposition. This is exactly the kind of pattern-matching AI tends to be good at across a large file.
Route it back through the client and the attorney. Some answers need client sign-off before they go out. All of them need the lawyer's sign-off regardless.
Purpose-Built Discovery AI | General Chatbot | |
Reads your actual case file | Usually, by design | Only what you paste in |
Drafts both directions | In some tools | Manually, prompt by prompt |
Flags missing client info | A few tools do this well | No |
Suggests objections | Available in several tools | Only if you ask, and only as good as your prompt |
Client-response collection | Built in on some platforms | Not built for this |
Jurisdiction-specific formatting | Common in discovery-specific tools | Manual |
A general chatbot is fine for brainstorming a question or cleaning up a sentence. Once the job involves searching an actual case file, tracking what's missing, drafting objections, and repeating that process across dozens of matters, the gap between a chatbot and a purpose-built discovery tool stops being subtle.
Even the best AI for creating interrogatories can produce a draft that reads well and still causes a problem down the line. Here's where to keep your guard up.
Questions that sound sharp but don't advance anything. AI can produce plausible-looking interrogatories that don't actually move the case theory forward. Rule 26 exists precisely to keep discovery tied to what's relevant and proportional, not just what's possible to ask.
A case-specific issue the model never surfaces. A generic set of questions can miss the one fact pattern unique to your case. AI supports the search; it doesn't replace judgment about what's actually worth chasing.
An objection that doesn't hold up. A generated objection can be plausible and still wrong for the jurisdiction or the specific request. Rule 33 requires grounds to be stated with specificity, and a vague or boilerplate objection risks being waived entirely.
A drafted answer built on a misread file. Every AI-assisted response needs a line-by-line check against the source document it claims to be based on.
Answers that contradict each other later. A response that looks fine in isolation can conflict with something already said in a deposition or a prior discovery response. That gap tends to surface at the worst possible time, usually in front of a judge.
Confidential material handled carelessly. Interrogatory responses often mean uploading medical records, client communications, and other sensitive material. The ABA's guidance on generative AI is direct about this: informed client consent matters before that information goes into a tool, particularly one that learns from what it's given.
There's no single best AI for creating interrogatories across every firm; there's a best fit for what your firm actually struggles with. Run any candidate through this list before you sign anything:
Plaintiff and PI firms: start with ProPlaintiff, then compare Eve and EvenUp.
Written discovery is the whole problem: Briefpoint.
Research and discovery planning matter more than drafting: CoCounsel Legal.
Enterprise scale across many practice areas: Harvey.
For plaintiff and PI firms specifically, we think so. ProPlaintiff's document tools list interrogatories by name, and its AI paralegal can search the case file and draft a response with a citation attached to every fact it uses. That keeps discovery inside the same system your firm already runs demands, chronologies, and pleadings through, instead of a separate app your team has to learn and re-upload files into.
If written discovery volume is the actual bottleneck rather than one piece of a bigger caseload, Briefpoint deserves a serious look. Eve and EvenUp are the closer plaintiff-side comparisons if ProPlaintiff isn't quite the right fit.
See what Tiff can do with a real case file. Book a demo.
ProPlaintiff, for plaintiff and PI firms, since drafting and case-file search live in the same platform. Briefpoint is the stronger pick if written discovery alone is the bottleneck.
Yes. ProPlaintiff, Eve, EvenUp, and Briefpoint all generate case-specific interrogatories today, not just generic templates.
Yes. The same four tools, plus CoCounsel for discovery planning specifically, support some part of the response side. Coverage varies, so check what each one actually claims before assuming.
It can suggest them. Eve, EvenUp, and Briefpoint all surface possible objections in a draft. Whether an objection holds up is still the attorney's call.
In the tools built for discovery, yes. Eve, EvenUp, and Briefpoint all cover requests for admission and production alongside interrogatories.
ProPlaintiff, Eve, and EvenUp, since all three are built around plaintiff and PI workflows rather than general litigation.
For brainstorming a question, sure. For a real discovery workload with case-file search, objection flagging, and repeatable formatting, a purpose-built tool earns its cost fast.
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