Compare · Accordance
Accordance alternatives for UK accountants
Accordance is a San Francisco AI platform for tax, audit and accounting teams, with multi-agent research that shows its reasoning and cites its sources. Its public pages describe US federal, state and local tax and international authorities. If you’re a UK firm weighing it up, compare which country’s tax law each tool answers from, how you check the answer, how the contract runs and how you pay. Here’s how Nylon and five other options compare, and when Accordance is still the better fit.
Nylon vs Accordance: the short answer
As at 22 October 2026, in pounds sterling. Details and sources below.
Accordance
Nylon
UK sources
Not described on Accordance’s public pages
UK tax legislation, HMRC guidance and tax decisions
Works in
The Accordance web app
Nylon, plus Claude, ChatGPT and Copilot (Adviser and Elite)
Contract
Set in your order form; 1 year by default, renews automatically
Monthly, cancel anytime
Price
Not published; set in your order form
£39–£199 per user a month, ex VAT
Scope
Tax, accounting and audit; US federal, state and international
Tax in Australia, New Zealand and the UK
Choose Nylon for cited answers from UK tax law, billed monthly, in the AI tools you already use. Choose Accordance if your work is mainly US federal, state and international tax, or accounting and audit research.
Each vendor’s own website is the source for its column.
The best Accordance alternatives at a glance
What each product says about itself on its own website, as at 22 October 2026. Prices exclude VAT unless stated.
Nylon
Cited AI answers from UK primary sources, in Nylon or your AI assistant
Yes, on every plan
£39, £99 or £199 per user a month
Tolley
Tolley commentary, practical guidance and HMRC manuals, with AI workflows
Yes, in Tolley+ with Protégé
Quote-based
Croner-i
Expert commentary, practice guidance and a tax and VAT advice line
Yes, from Croner’s own content
Quote-based
Blue J
AI tax research from UK sources, Tax Notes and IBFD
Yes
£1,500 a year per user (sole practitioners); teams: quote
Lexis+ with Protégé
Broad UK legal research, including Halsbury’s Laws and Tolley titles
Yes
Quote-based
ChatGPT or Claude on their own
Quick drafting where nobody needs to trace the source
Only with web search on
Free and paid plans
What Nylon does differently for UK accountants
Accordance is strong on multi-agent research across US federal, state and international tax. Nylon is built for cited answers from UK tax law, billed monthly, wherever you work.
Built on UK tax law
Nylon answers from UK tax legislation, HMRC manuals and guidance, and tax tribunal and court decisions, and links each citation to the source. Accordance describes its library as “federal, state, local, and international” authorities. UK tax sources aren’t described on its public pages, and the firms it names are US CPA firms.
Monthly, not annual
Nylon is billed monthly and you can cancel anytime. Accordance’s contract term is set in your order form. If the order form doesn’t say, its terms make it one year, renewing automatically unless you give notice 30 days before it ends.
Per-user prices, published
Nylon publishes its prices: £39, £99 or £199 per user a month, ex VAT. Accordance doesn’t publish prices; its fees are set in an order form.
Nylon inside Copilot, Claude and ChatGPT
Adviser and Elite seats bring Nylon into Microsoft Copilot, Claude and ChatGPT, with every answer cited. A connector for those assistants isn’t described on Accordance’s public pages.
1. Nylon
Nylon: cited AI answers from UK primary sources
Nylon answers UK tax questions from tax legislation, HMRC manuals and guidance, and tribunal and court decisions, and links every citation to the source.
Cited answers
Every answer comes with hyperlinked citations to the primary source.
UK tax library
UK tax legislation, HMRC manuals and guidance, and tax decisions from the tribunals and courts.
Drafting and review
Draft advice letters, research memos and tax opinions, or upload client documents and ask what matters.
In your AI tools
Adviser and Elite seats include Nylon’s AI connector for Claude, ChatGPT and Microsoft Copilot.
Pricing
Starter £39, Adviser £99 and Elite £199 per user per month, ex VAT. Billed monthly; cancel anytime. Free 7-day trial. Enterprise pricing on request.
Nylon
When does a business have to register for VAT?
You must register if your taxable turnover for the last 12 months has gone over £90,000, or you expect it to go over £90,000 in the next 30 days alone [1]. Under the 12-month test, tell HMRC within 30 days of the end of the month you went over [2].
1
Value Added Tax Act 1994, Sch 1 para 1
2
Value Added Tax Act 1994, Sch 1 para 5
Illustrative example
Benchmark · October 2026
4.68 / 5
Nylon’s composite score on 91 CPA Program Australia Taxation questions, each graded blind against an expert reference answer.
Nylon
4.68
Claude Fable 5.1
4.32
GPT-6 Astra
4.28
Australian tax, compared with five general AI models. Specialist tools, including Accordance, weren’t tested.
Nylon vs Accordance, side by side
As at 22 October 2026. The Accordance column comes from Accordance’s website, terms and trust centre.
Where you use it
The Accordance web app. Accordance says integrations connect through a sign-in connector to tools you authorise; which tools isn’t described. A connector for Claude, ChatGPT or Microsoft Copilot isn’t described on Accordance’s public pages.
Nylon on the web, and Claude, ChatGPT and Microsoft Copilot through the AI connector (Adviser and Elite).
Contract
Set in your order form. If the order form doesn’t say, the term is one year and renews automatically unless you give notice 30 days before it ends. Its standard terms provide for early termination only for cause, and fees paid aren’t refunded unless agreed in writing.
Monthly. Cancel anytime.
Price
Not published. Fees are set in your order form, and Accordance may change prices from your next renewal term, with reasonable notice.
£39, £99 or £199 per user a month, ex VAT. Enterprise: quote.
AI answers
A multi-agent system runs each research step (facts, issues, authority, weighing, recommendations) with dedicated agents. Accordance says it cites primary sources inline and shows its reasoning so you can audit it.
Fast and research modes on every plan, plus deep research on Adviser and Elite. Every answer links each citation to the primary source.
What answers draw on
“Federal, state, local, and international” authorities, Accordance says: tax statutes, accounting standards, court precedents, tax treaties and state and local rules.
Nylon’s library: UK tax legislation, HMRC manuals and guidance, and tax decisions from the tribunals and courts.
Jurisdictions
US federal, state and local tax, plus international tax and treaties. UK tax sources aren’t described on Accordance’s public pages.
Australian, New Zealand and UK tax legislation and guidance in one library.
Scope
Tax, accounting and audit. Its case studies show audit teams using it to interpret accounting standards.
Tax. No editorial commentary, calculators or templates: Nylon answers from the primary sources.
Drafting and review
Structured drafts for clients and authorities, such as memos, emails and rebuttal letters. Summaries and analysis of uploaded documents. Projects keep the facts and record of a matter together.
Nylon drafts advice letters, research memos and tax opinions, and reviews uploaded client documents.
Security and data
SOC 2 Type II (security, availability and confidentiality). Never trained on customer data. Hosted on Microsoft Azure, with customer data stored in the United States only. Its data processing agreement includes the UK International Data Transfer Addendum.
Nylon is SOC 2 Type I and Type II audited, and ISO 27001 and ISO 42001 certified. All data that passes through Nylon is encrypted in transit and at rest.
Trial
Its terms provide for trials on approval, with the length set by Accordance. Demos on request.
Free 7-day trial when you sign up, or book a demo.
What you gain with Nylon
Answers from UK tax legislation, HMRC manuals and guidance, and tax decisions
Monthly billing, with published per-user prices
Nylon inside Microsoft Copilot, Claude and ChatGPT (Adviser and Elite)
SOC 2 Type I and Type II audited, and ISO 27001 and ISO 42001 certified
What you give up
US federal, state and local tax research, plus international treaties
Accounting and audit research, including accounting standards
Multi-agent projects that show each step of the reasoning
Test Nylon on your own Accordance questions
Bring three UK tax questions you’d put to Accordance. In the demo, we’ll answer them in Nylon with every source linked.
Other Accordance alternatives
Each summary comes from the product’s own website, as at 22 October 2026.
2
Tolley
LexisNexis’s UK tax platform. Tolley+ with Protégé (renamed from Tolley+ AI in 2026) adds AI workflows, drafting and answers that link to Tolley research, practical guidance, and current and historic HMRC manuals.
Best for
Firms that want Tolley’s commentary, including Simon’s and De Voil, with AI on top.
Pricing
Quote-based.
Consider it if
You want expert-written guidance, worked examples and templates alongside AI answers.
3
Croner-i
Croner’s tax, audit and accounting resource. Its AI assistant, Croner Intelligence, answers only from Croner’s expert-written content and now drafts letters. The Small Firm service adds legislation, tax cases, HMRC manuals and a tax and VAT advice line.
Best for
Firms that want commentary, practice guidance and phone support.
Pricing
Quote-based.
Consider it if
You want a telephone advice line and audit and accounting guidance as well as tax.
4
Blue J
An AI tax research platform with a UK edition. Its UK answers draw on legislation, HMRC publications and commentary, and since June 2025 on curated case law from the First-tier Tribunal to the Supreme Court.
Best for
Firms that want AI tax research backed by Tax Notes and IBFD content.
Pricing
£1,500 a year per user for sole practitioners (VAT not stated); teams by quote. 7-day free trial, no card needed.
Consider it if
You work in Legora, where Blue J’s tax research is now available.
5
Lexis+ with Protégé
LexisNexis’s UK legal platform, renamed from Lexis+ AI. Protégé, its AI assistant, works across Legal Research and Practical Guidance, with Halsbury’s Laws, Tolley titles and 600,000+ cases, and drafts in Word through Create+.
Best for
Legal professionals doing broad UK legal research.
Pricing
Quote-based.
Consider it if
Your work is mostly legal rather than tax.
6
ChatGPT or Claude on their own
General AI assistants that answer from their training data and, when it’s on, web search. OpenAI’s help centre warns that ChatGPT’s citations can be incomplete, outdated or incorrect.
Best for
Quick drafting and orientation where nobody needs to trace the answer.
Pricing
Free and paid plans.
Consider it if
You add Nylon’s AI connector, so they search Nylon’s library and cite the source.
Which should you choose?
Match the tool to the work you do most.
If you want cited answers on UK tax
Nylon
Monthly per-user plans, in Nylon or in Copilot, Claude and ChatGPT.
If your work is mainly US tax
Accordance
US federal, state and international tax, with multi-agent research that shows its reasoning.
If your work runs on Tolley’s guidance
Tolley
Simon’s, De Voil and practical guidance, with AI workflows.
If you want a phone advice line
Croner-i
Commentary, practice guidance and a tax and VAT advice line.
If you want Tax Notes and IBFD behind answers
Blue J
AI tax research from UK sources and its publishing partners.
If your work is mostly legal
Lexis+ with Protégé
Broad UK legal research with Halsbury’s Laws.
Security your firm can check
Nylon is SOC 2 Type I and Type II audited, and ISO 27001 and ISO 42001 certified.
Independently audited
SOC 2 Type I and Type II reports are available, and Nylon holds ISO 27001 and ISO 42001 certification.
Encrypted
All data that passes through Nylon is encrypted in transit and at rest.
Not used for training
Your questions and Nylon’s answers aren’t shared, and your inputs are never used to train AI models.
Admin controls
Every plan includes advanced organisational controls.
Baqir Hussein, FCCA · Founder & Director, Finex Chartered Certified Accountants
Accordance alternatives: frequently asked questions
Questions about switching? Book a demo or email support@usenylon.com.
What is the best alternative to Accordance?
If you want cited AI answers from UK tax legislation, HMRC guidance and tax decisions, billed monthly, Nylon: it links every answer to the source and works inside Copilot, Claude and ChatGPT (Adviser and Elite). If your work runs on expert commentary and practical guidance, Tolley or Croner-i. For AI research backed by Tax Notes and IBFD, Blue J. For broad legal research, Lexis+ with Protégé.
Does Accordance cover UK tax?
As at 22 October 2026, Accordance’s public pages describe “federal, state, local, and international” authorities, and the firms it names are US CPA firms. UK tax legislation, HMRC guidance and UK tax decisions aren’t described on its public pages, so ask Accordance what it covers. Its data processing agreement includes the UK International Data Transfer Addendum for UK customers.
How does Accordance work?
As at 22 October 2026, Accordance describes a multi-agent system: dedicated agents extract the facts, identify the issues, find and weigh the authority, and recommend a position with the risks declared. It cites primary sources inline and shows its reasoning. Projects keep a matter’s facts and research together. Accordance was founded in San Francisco in 2024.
How does Accordance pricing compare with Nylon?
As at 22 October 2026, Accordance doesn’t publish prices, so there’s no like-for-like figure to compare. Its fees are set in an order form, and if the order form doesn’t set a term, it’s one year, renewing automatically unless you give 30 days’ notice. Nylon costs £39, £99 or £199 per user a month, ex VAT, billed monthly, and you can cancel anytime.
Does Nylon cover UK tax?
Yes. Nylon’s library covers UK tax legislation, HMRC manuals and guidance, and tax decisions from the tribunals and courts, alongside Australian and New Zealand tax. It covers UK tax, not general UK law.
Does Nylon have a free trial?
Yes. Start a free 7-day trial when you sign up, or book a demo to see Nylon on your own questions. Plans are monthly and you can cancel anytime. Accordance’s terms provide for trials on approval; it doesn’t publish their length.
Can I use Nylon in ChatGPT, Claude or Copilot?
Yes, with an Adviser or Elite seat. Nylon’s AI connector lets those assistants search Nylon’s library and cite the source.
Is Nylon secure enough for client work?
Nylon is SOC 2 Type I and Type II audited, and ISO 27001 and ISO 42001 certified. Data is encrypted in transit and at rest, and your inputs are never used to train AI models.
Keep exploring
Nylon for accountants
Research, drafting and review for accounting firms.
Tax research benchmark
91 Australian tax questions, six systems, graded blind.
AI connectors
Nylon in Claude, ChatGPT and Copilot.
Plans
Starter, Adviser and Elite, billed monthly.
Information about other products comes from their own websites as at 22 October 2026 and can change. Prices are in pounds sterling. Accordance is a trade mark of Agnetic Labs Inc. Other product names belong to their owners. Nylon isn’t affiliated with or endorsed by any of them. Nylon’s October 2026 benchmark compared general AI models, not the other products on this page. Spotted something out of date? Email support@usenylon.com.