SingleFile vs SixFifty: how they compare in 2026

Most of the AI serves SingleFile's own staff, not the customer. The vendor says so repeatedly: Intelligence powers our team so we can keep your entities compliant, and the published flow runs research, collect, review, file, with our experts verifying every detail. The workbench screenshot shows the vendor's own filing queue. What the customer receives is registered agent coverage, filings prepared and submitted on its behalf, and an entity platform holding records, documents, a calendar and permissions, none of which needs a model. Two features do face the customer. Org Charts builds ownership diagrams from entity data and edits them from plain instructions, and the filing readiness review writes its findings to the customer. Both sit on a platform whose value stands without them.

SixFifty's legal process page sets out how the product is made. Documents are sourced from expert lawyers, researched and drafted by SixFifty's own attorneys, and delivered through a guided question flow that asks, in SixFifty's words, the same questions a lawyer would. The legal team then monitors federal and state change and writes the updates. None of that is machine learning. Two features are. Ask SixFifty AI answers plain language questions by retrieving from the Research database and linking back to the entries it used, and an AI merge applies the legal team's written updates to documents a customer has already generated. Without both, the platform still sells a document generator built by lawyers, a maintained employment law database and a monthly update service. The AI makes an existing corpus easier to query; it does not write the law or the documents.

Accuracy is asserted throughout the marketing and never measured. The claims are firm: filings handled accurately and on time, every time, and entities kept compliant faster and more accurately than ever. No accuracy figure, test set, evaluation or error rate goes with them. Nothing says where the automated research draws state requirements from or how they are kept current, which is the live grounding question for a product that depends on knowing what each jurisdiction requires this year. What is published is a plain limitation on the AI output itself. The filing review carries a line saying it was generated by AI and may contain errors or miss issues, and that the customer should always verify their information before submitting.

Ask SixFifty AI is described as retrieval augmented generation over SixFifty's own Research database rather than the open web, and every answer carries links to the Research entries it drew on so a user can open them and cross reference. SixFifty says so in its FAQ and contrasts it with general assistants and search engines on that ground. The database is written and maintained by named attorneys and covers all 50 states plus a published list of localities, and SixFifty says the assistant always works against the current version. The links lead to SixFifty's own summaries of the law rather than to the statute or regulation, so verification stops one step short of primary authority. No accuracy figure, test set or error rate is published, and the Terms of Use disclaim accuracy entirely.

Human approval is a stated gate with a named actor and a fixed point in the workflow. Nothing files without it: the vendor's compliance specialists review every AI suggestion, verify accuracy and approve filings before they are submitted for the customer. That names who reviews, what they review and when, which goes beyond a bare human in the loop phrase. What is missing is the boundary. The published workbench shows items labeled AI Ready, Needs Review and Auto-Validation, with nothing explaining what routes an item into each, so the point where the system validates something without a person is unstated. Nothing describes what happens when a review misses an error. The customer's own oversight is not addressed either: the reviewers are the vendor's staff, and the customer sees an approved filing rather than a decision to check.

In SixFifty, documents come from a question flow the customer answers rather than from a model, the result opens in an editor where it can be changed, version history tracks what moved, and legal updates arrive as suggested redlines the customer chooses to merge rather than as silent edits. The Terms of Use state that the AI is not intended or designed to replace or override human decision making. The Privacy Notice bars a use outright: the AI features may not be used to make or substantially assist with any legal, financial or employment decision. That limit binds the customer rather than describing a behavior the product enforces. Nothing published describes a confidence threshold, a point at which the assistant declines, or what happens after an answer turns out to be wrong.

25 organizations are displayed as customers, among them DLA Piper, Wilson Sonsini and AngelList, and none is tied to an outcome. Every testimonial is stripped of attribution and identified only by role and company type, such as a Corporate Attorney at a regional law firm. The published figures are corporate totals rather than deployment results, among them 7,500 companies, 18,000 annual reports filed in the last twelve months and 84.7 percent of inquiries answered within eight hours. None states a method, and only the filing figure carries a measurement window. No named customer is joined to any figure.

Boise State University is SixFifty's most detailed case: a named Associate General Counsel, the only member of her legal team working on employment law, managing documents for more than 4,000 employees across almost 40 states, with the handbook and employment agreements named as what she uses. FloQast is named with its own account of rebuilding an all US handbook in 2021 and moving to a rip and replace approach on the monthly updates, quoted by a named VP of Human Resources. Hatch appears with a cost comparison for new employee contracts. Customer logos run to a dozen recognizable companies, and a dedicated universities page carries the Boise State story again. No before and after figure, time saved or method is published, and the case pages are undated. The home page's claim of more than 500,000 businesses using SixFifty is published with no basis.

Confidentiality commitments in the current published agreement are substantive, and privilege is not addressed. Section 17 makes all Content and Entity Data the customer's confidential information, defining Entity Data to include company records, officer and beneficial owner details, organizational and financing documents and ownership relationships. SingleFile is bound to at least reasonable care, may not use the information for any purpose outside the agreement, and may share it only with personnel and providers who need it and carry obligations at least as protective. It commits to safeguards against unauthorized access and states that it will not sell Content or Entity Data or use Entity Data for any party's independent commercial benefit, except in aggregated form that identifies no one. Section 17(e) adds return or destruction on request, with certification. Privilege and work product are not treated anywhere.

OpenAI is the model provider, and prompts users submit are stored in a secure internal environment for quality assurance and misuse detection. Those stored prompts are not used to train or improve any model and are not shared with the provider for that purpose, personal information will not be used to train generative models without consent, and SixFifty says it does not use personal information for automated decision making or profiling. The published agreement is a website terms of use with no confidentiality clause, no data processing terms, no retention or deletion commitment, and nothing on segregation between accounts, though HR consultants and PEOs run many client companies through the same platform. Attorney client privilege and work product are not mentioned. The Terms defer to a separate signed agreement that is not published.

The advice line is drawn in published terms more than once and tied to specific outputs. Section 4(h) is headed no legal, tax or compliance advice. It provides that the entity management services and any reports, charts, alerts, calculations or other output from them are for convenience and information only, and are not legal, tax, accounting or compliance advice or a substitute for qualified professionals. The customer remains solely responsible for its own legal, regulatory and corporate governance compliance. Section 18(c) repeats that information provided through the services is not legal advice and is not guaranteed correct, complete or current. Section 18(d) adds that SingleFile does not guarantee that use of the services will enable compliance with applicable law. Together these set out where the product stops. No professional conduct position is published for the law firms that run client entity work through the platform.

Information provided through the sites does not constitute formal legal advice, the Terms of Use of 17 November 2025 state in capitals, and use forms no attorney client relationship, with a separate legal disclaimer incorporated. The AI FAQ says the assistant provides legal information only and is not a substitute for legal advice. The pricing FAQ says the team does not serve as the customer's personal legal counsel and recommends consulting their own attorney. The Privacy Notice bars use of the AI features to make or substantially assist with any legal, financial or employment decision. Jurisdiction coverage is published state by state and locality by locality. The marketing says the opposite in places: manage compliance like an employment lawyer without being one, be your own employment law expert, law firm quality documents, and a page arguing the product against hiring a law firm. Nothing addresses the supervision question that raises.

No governance position of any kind is published. There is no responsible AI page, principles statement, named owner, testing regime before release, management system or certification such as ISO 42001. The Intelligence page describes what the AI does and not how it is governed, and nothing addresses uneven output. The site navigation and footer were inventoried in full on 4 September 2026, and the only policy documents published are the terms of service, the privacy policy and a cookie policy.

The AI features are described as assistive technologies not designed to replace or override human decision making, in both the Privacy Notice and the Terms of Use. SixFifty says it does not use personal information for automated decision making or profiling, prompts are stored for quality assurance, usage monitoring and misuse detection, and the customer is responsible for validating the accuracy and appropriateness of any output. That is a disclosure about data handling and responsibility rather than governance of model behavior. Nobody is named as accountable, and nothing is published about what is tested before a change to the AI features ships. Nothing says whether output differs across jurisdictions, employer types or the protected characteristics that employment law largely concerns. The legal content is maintained by named attorneys; no one is named for the model.

Data has a fixed end point, with a sixty day window to retrieve it after termination and a separate route to return or destroy it on request. Section 17 ties access to the purpose of the service, commits to administrative, physical and technical safeguards and rules out selling Content or Entity Data. Who else touches the data is not disclosed: outside providers are acknowledged repeatedly in the terms and not one is named, no subprocessor list exists, and no commitment to tell the customer about a breach is published in the terms. SingleFile also publishes a privacy policy.

Prompts typed into the AI may be stored in a secure internal environment for quality assurance, usage monitoring and misuse detection, the Privacy Notice says, and they are not used to train or develop models or shared with the model provider for that purpose. Security is described as reasonable efforts and administrative, technological and physical safeguards, with no controls named. No retention period is stated for prompts, generated documents or account data, and no deletion commitment appears. There is no subprocessor list for the service, no incident response practice, no breach notification commitment and no access control description. The named third parties are analytics and advertising partners, plus OpenAI for the models, rather than a list of who holds customer content.

A remedy aimed at the product's actual failure mode sits in section 18(d). Where a filing is late or inaccurate solely because of a mistake by SingleFile or another cause within its reasonable control, SingleFile agrees to pay the relevant late fees, the cost of resubmitting and other out of pocket costs directly resulting, on supporting documentation. For a compliance filing product that is the loss that matters, and it is committed rather than disclaimed. Section 21 adds infringement remedies ending in termination and a pro rata refund, and section 24(g) refunds prepaid unused fees where a service is discontinued. Otherwise the services are provided as is with warranties disclaimed, and aggregate liability is capped at fees paid in the preceding twelve months. Indemnity under section 20 runs one way from the customer, and liability for trial and beta features is capped at fifty dollars. Nothing warrants the AI output itself, and no insurance position is published.

Liability for damages of any kind, under any legal theory, arising from use of the sites or anything obtained through them, direct and indirect alike, is excluded by the Terms of Use of 17 November 2025, and the exclusion is not tied to a cap based on fees. The AI clause repeats the point: all AI is provided as is, with no warranty of any kind, and all liability for the AI, its output and the use of that output is disclaimed. The customer is solely responsible for relying on AI output, including its accuracy, applicability, reasonableness and bias. Indemnity runs one way, from the customer to SixFifty. Claims must be brought within one year, through binding arbitration under consumer rules with a class waiver. No indemnity, warranty or insurance covers a document or an answer that turns out not to comply.

A comparison chart on the home page lists API access for integrations against traditional providers, and a developers section sits in the site navigation. Section 13(c) of the terms contemplates tools that export content to third party providers. Outside the developers page, no document management, matter management, CLM, billing or accounting system and no integration partner is named, and nothing says what data moves, in which direction or on what trigger.

No integration with the systems this work already lives in is named. No HRIS, payroll system, document management system or contract repository appears in SixFifty's navigation, product pages or footer. Sharing and electronic signature are built into the platform rather than connected to anything outside it. A finished document is generated, edited in SixFifty's own editor and sent for signature from there, and legal updates arrive as suggested redlines against documents the platform holds. The Partnerships page describes a reseller arrangement for HR consultants and PEOs rather than a technical integration, and no developer documentation or API is published.

Delivery is cloud only, and neither tenancy nor residency is stated. The service runs in a browser at a named application subdomain behind an account, and no option to run it on the customer's own servers is offered. Nothing read says whether customers share infrastructure, and no dedicated or isolated option appears; the segregated client workspaces offered to law firms are a permission boundary inside one account, not a tenancy model. No region is named for storage or processing and no cloud provider is identified. The only geographic statement is a restriction on use: section 26(l) says the services are intended for visitors located within the United States and makes no representation about availability elsewhere. That says who may use the product, not where the data sits.

SixFifty's Privacy Notice states that the services are hosted in the United States and are intended for visitors located within the United States, and tells a user outside the country that using the platform means transferring their information to the US for storage and processing. It also says SixFifty may transfer data from the US to other countries or regions in connection with storage, processing and operating the services, without naming which. Nothing is published about the tenancy model, whether accounts share infrastructure or sit apart, though HR consultants and PEOs run many client companies through one subscription. No single tenant, private or regional option is offered, no cloud provider is named, and the model provider's processing location is not addressed.

A SOC 2 Type II attestation is claimed and nothing behind it is published. The footer of every page carries a SOC 2 Type II badge reading achieved, linked to the AICPA, and the comparison table lists SOC 2 Type II as an independent security audit against varies for traditional providers. A Type II report is an examination by an independent firm over a defined period against a defined system boundary. None of that is published here: no auditing firm, examination period, scope or system description is given, and no report or bridge letter is offered. There was no trust center, portal or request route anywhere on the site, so which systems were examined, and when, cannot be established. No other certification is claimed.

No independent security attestation is published, and SixFifty does not claim one. There is no security page and no trust center in the navigation or the footer, no SOC 2, ISO or penetration test reference in the Terms of Use or the Privacy Notice, and no badge on the site. The Privacy Notice offers a statement of effort instead: reasonable efforts using administrative, technological and physical safeguards, followed by an acknowledgment that no information system can be completely secure. No report, scope or audit period is offered. This is a record of what is published, not a finding about SixFifty's actual security.

A distinct, named AI layer is described and nothing underneath it is identified. Intelligence is presented as a capability that researches requirements, fills forms, maps structures and reviews filings, and the marketing speaks of AI suggestions and automatic validation. No model, version, provider or hosting arrangement is named, and no commitment to notify customers of a model change is published. The terms acknowledge outside providers without naming one. The question carries weight here because the system handles beneficial ownership records, officer personal data and government identifiers, and no published source says whose model reads them.

Integrations with hosted third party models from OpenAI power all AI features in the SixFifty platform, according to the Privacy Notice, which commits that stored prompts are not shared with the model provider for training, improvement or development. The Terms of Use separately acknowledge that a customer may be using AI provided by SixFifty or by third parties. No model or version is identified, nothing says where model calls are processed or under what commercial terms, and no retention position for the provider is stated beyond the training exclusion. Nothing commits to telling customers if the provider or model changes, though everything runs on one provider.

No figure is published at any level, and the marketing claims a transparency the site does not deliver. The terms set out the structure in section 16, with one time filing fees, annual subscriptions and state fees charged on top. The shape of an invoice can therefore be described before contacting the company, but not its size. Section 16(a) sends customers to onboarding and a fee schedule available on request for fees and refunds, so the schedule exists and is held back. The home page comparison table, meanwhile, advertises transparent service based pricing against fees charged per entity. That claim sits on a site whose every commercial route is a contact or demo request.

SixFifty's pricing page states the basis directly: pricing is set by how many employees a company has and how many states they are located in, so that a buyer pays for the footprint they actually have. It adds that all subscriptions except marketplace purchases allow unlimited users, and that access to document templates varies by subscription plan. Every route to a figure runs through a quote form; no rate, tier name or starting price appears, and no implementation or onboarding charge is stated. Support is described as included, with a dedicated customer success manager meeting quarterly and chat in the app. SixFifty's cost argument is comparative rather than numeric, that the documents cost less than commissioning them from a law firm, and one named customer calls the price immaterial against what the firm gets. The basis of the charge is published; the amount is not.

Three audiences have their own pages and definitions: law firms managing client entities, investment organizations such as private equity and venture capital firms, and corporate legal and compliance teams. Jurisdictional coverage is stated precisely and often as all fifty states plus the District of Columbia and Puerto Rico, with registered office services in five further global markets listed separately. The service list reaches specialized work such as placing independent directors and springing members for special purpose entities. One limit is published in the vendor's own site summary: it specializes in US business entity compliance rather than international entities or general corporate legal services. Firm size, the entity volume the platform suits and the edges of its US entity work are not stated.

Four buyer groups are named, each with what it gets: HR teams, consultants and PEOs serving several client companies, General Counsel offloading routine drafting and statutory monitoring, and startups. Public sector use is evidenced through a universities page and a named state university customer. Practice coverage is employment law across all 50 states at federal, state and local levels. The pricing page publishes locality coverage, naming the California, Illinois and Minnesota cities and counties covered for paid sick leave and the policies covered in San Francisco, Chicago, New York City, Westchester County, Philadelphia, Seattle and Oakland. Two adjacent lines, privacy documents and routine business documents, are named. No company size boundary is stated, and a home page figure of more than 500,000 businesses has no basis behind it.