Compare · Croner-i
Croner-i alternatives for UK accountants
Croner-i is Croner’s online library for UK tax, audit and accounting, with expert commentary, a tax and VAT advice line and Croner Intelligence, its AI assistant. If you’re weighing an alternative, compare where answers come from, how you check them, where you can use them and how you pay. Here’s how Nylon and five other options compare, and when Croner-i is still the better fit.
Nylon vs Croner-i: the short answer
As at 22 October 2026, in pounds sterling. Details and sources below.
Croner-i
Nylon
Works in
Croner-i and Croner Intelligence
Nylon, plus Claude, ChatGPT and Copilot (Adviser and Elite)
Contract
Fixed term, no early exit; renews unless 90 days’ notice
Monthly, cancel anytime
Price ex VAT
Quote only; prices not published
£39–£199 per user a month
AI answers
Croner Intelligence, from Croner’s own content, with citations
Every answer cites and links the primary source
Commentary
Croner commentary, Navigate Tax and a tax and VAT advice line
Not included: answers cite legislation, HMRC guidance and cases
Choose Nylon for cited answers from UK primary sources, in the tools you already use, billed monthly. Keep Croner-i if your work runs on its commentary and advice line, and add Nylon alongside.
Each vendor’s own website is the source for its column.
The best Croner-i 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
Simon’s, De Voil and Tolley guidance, with AI built in
Yes, with Tolley+ with Protégé
Quote-based
Blue J
AI research across UK, US and Canadian tax
Yes
£1,500 a year per user (sole practitioners); teams: quote
Accordance
Multi-agent AI for tax, audit and accounting teams
Yes
Not published
Lexis+ with Protégé
Broad legal research and drafting, with citation checks
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
Why UK accountants choose Nylon over Croner-i
Croner-i is strong on commentary, practical tools and phone support. Nylon is built for cited answers from the law itself, wherever you work.
Research inside your AI assistant
Adviser and Elite seats bring Nylon into Claude, ChatGPT and Microsoft Copilot, with every answer cited. Croner’s public pages don’t describe a connector for any of them.
No fixed term
Nylon is billed monthly and you can cancel anytime. Croner’s terms set an initial period with “no provision for early termination”. It renews for the same period unless you give 90 days’ written notice, and fees can rise by up to 10% at each renewal.
Answers from primary law
Every Nylon plan answers from UK tax legislation, HMRC manuals and guidance, and tribunal and court decisions, and links each citation to the source. Croner says Croner Intelligence is “built entirely on Croner’s verified expert-authored content”.
Per-user prices, published
Nylon publishes a per-user price for Starter, Adviser and Elite. Croner-i is sold by quote, with packages sized by number of partners, and its prices aren’t published.
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 Croner-i, weren’t tested.
Nylon vs Croner-i, side by side
As at 22 October 2026. The Croner-i column comes from Croner’s website and its own publication, Business & Accountancy Daily.
Where you use it
The Croner-i online library, and Croner Intelligence, which has its own sign-in. A connector for AI assistants isn’t described on Croner’s public pages.
Nylon on the web, and Claude, ChatGPT and Microsoft Copilot through the AI connector (Adviser and Elite).
Contract
An initial period set in your agreement, with no early termination. It renews for the same period unless either side gives 90 days’ written notice. Fees can rise by up to 10% at each renewal.
Monthly. Cancel anytime.
Price (ex VAT)
By quote. Packages for sole practitioners and firms of 2–5, 6–10 and 11+ partners, each in Essentials and Complete. Prices aren’t published.
£39, £99 or £199 per user a month. Enterprise: quote.
AI answers
Croner Intelligence answers questions and reads uploaded documents. Croner says its answers carry citations that state a tax year. AI Overview summaries in Croner-i search link to the source. Whether Croner Intelligence comes with every package isn’t described on Croner’s public pages.
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
Only Croner’s own content, “not the open internet”, which Croner says is expert-authored. The library holds commentary, tax legislation, HMRC manuals and tax cases.
Nylon’s library: UK tax legislation, HMRC manuals and guidance, and tax decisions from the tribunals and courts.
Jurisdictions
UK tax, with international add-ons such as worldwide tax treaties, a Global VAT Library and the US Master Tax Guide. Australian and New Zealand tax content isn’t described on Croner’s public pages.
UK, Australian and New Zealand tax legislation and guidance in one library.
Expert commentary
In-depth and practical commentaries on UK taxes, Quick Overview explanations and Navigate Tax’s 90+ transaction-based modules. Larger packages add UK GAAP, IFRS and audit guidance.
No editorial commentary. Nylon answers from the primary sources.
Drafting and tools
Workflows, launched in October 2026, drafts letters from 50+ templates, such as engagement letters and HMRC correspondence, and exports them to Word. Packages add disclosure software, an engagement letter toolkit and model accounts.
No calculators or templates. Nylon drafts advice letters and memos, and reviews uploaded documents.
Advice line
A tax and VAT telephone advice line in every package Croner lists, plus an HR advice line for accountancy clients at no extra cost.
Not included.
Trial
Free demo. A free trial isn’t described on Croner’s public pages.
Free 7-day trial when you sign up, or book a demo.
What you gain with Nylon
Nylon inside Claude, ChatGPT and Microsoft Copilot (Adviser and Elite)
Monthly billing, with no fixed term or 90-day notice period
AI answers that cite and link the primary source, on every plan
Published per-user prices, from £39 a month (ex VAT)
What you give up
Croner commentary, Quick Overviews and Navigate Tax modules
Croner’s tax and VAT telephone advice line
Letter drafting from 50+ templates, disclosure software and model accounts
UK GAAP, IFRS and audit guidance in the larger packages
Test Nylon on your own Croner-i questions
Bring three questions you researched in Croner-i this month. In the demo, we’ll answer them in Nylon with every source linked.
Other Croner-i alternatives
Each summary comes from the product’s own website, as at 22 October 2026.
2
Tolley
LexisNexis’s UK tax research and guidance. Tolley+ with Protégé, renamed from Tolley+ AI in 2026, gives citation-backed AI answers grounded in Tolley research and guidance, including Simon’s and De Voil, plus guided workflows and drafting.
Best for
Firms that want Tolley’s commentary and practical guidance with AI built in.
Pricing
Quote-based.
Consider it if
You rely on Simon’s Taxes or De Voil and want AI on top of them.
3
Blue J
AI tax research with in-line citations. Its UK coverage includes legislation, HMRC manuals and guidance, VAT notices, and tax tribunal and court decisions, plus Tax Notes commentary and IBFD international content. It also covers US and Canadian tax.
Best for
Firms researching UK, US and Canadian tax, or cross-border questions.
Pricing
£1,500 a year per user for sole practitioners (VAT not stated); teams by quote. 7-day free trial.
Consider it if
Your clients have US or Canadian tax affairs as well as UK ones.
4
Accordance
A San Francisco multi-agent AI platform for tax, audit and accounting teams, founded by researchers from Stanford AI Lab. It shows its reasoning and a source list, and holds SOC 2 Type II certification.
Best for
Firms that want one AI across tax, audit and accounting work.
Pricing
Not published; book a demo.
Consider it if
You want agentic AI across your practice. UK tax coverage isn’t described on Accordance’s public pages.
5
Lexis+ with Protégé
LexisNexis’s legal AI for drafting, research and analysis, renamed from Lexis+ AI. It grounds work in LexisNexis primary law, secondary sources and practical guidance, checks citations with case signals, and connects to iManage, SharePoint and NetDocuments.
Best for
Law firms and legal teams doing broad legal research and drafting.
Pricing
Quote-based.
Consider it if
Your work is mostly legal rather than tax. For tax, LexisNexis sells Tolley+ with Protégé.
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 from the law itself
Nylon
In Nylon or in Claude, ChatGPT and Copilot, billed monthly.
If your work runs on Croner’s commentary and advice line
Keep Croner-i, add Nylon
Keep its commentary, advice line and letter templates, and use Nylon for cited answers. Nylon is billed monthly, so you can add it mid-contract.
If you rely on Simon’s Taxes or De Voil
Tolley
LexisNexis’s UK tax commentary, with AI built in.
If your clients have US or Canadian tax affairs
Blue J
UK, US and Canadian tax in one AI research tool.
If you want AI across tax, audit and accounting
Accordance
Multi-agent AI for the whole practice.
If your work is mostly legal
Lexis+ with Protégé
Broad UK legal research and drafting.
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
Croner-i alternatives: frequently asked questions
Questions about switching? Book a demo or email support@usenylon.com.
What is the best alternative to Croner-i?
If you want cited AI answers from UK primary sources, Nylon: it links every answer to the source, works inside Claude, ChatGPT and Copilot, and is billed monthly. If you want Simon’s Taxes and De Voil with AI built in, Tolley. For UK, US and Canadian tax in one tool, Blue J. For broad legal research, Lexis+ with Protégé.
Does Croner-i have AI?
Yes. As at 22 October 2026, Croner offers Croner Intelligence, an AI assistant for tax professionals that answers questions, reads uploaded documents and, since October 2026, drafts letters from 50+ templates. Croner says it draws only on Croner’s own content, not the open internet, and that its answers carry citations. Croner-i search also has AI Overview summaries that link to the source material.
How does Croner-i pricing compare with Nylon?
As at 22 October 2026, Croner doesn’t publish Croner-i prices: you request a quote, and packages are sized for sole practitioners and firms of 2–5, 6–10 and 11+ partners. Croner’s terms set an initial period with no early termination, renew it automatically unless you give 90 days’ notice, and allow fee rises of up to 10% at renewal. Nylon costs £39, £99 or £199 per user a month, ex VAT, billed monthly.
Does Nylon include Croner’s commentary or advice line?
No. The commentary, Navigate Tax modules and tax and VAT advice line are Croner’s own. Nylon answers from primary sources: UK tax legislation, HMRC manuals and guidance, and tribunal and court decisions. You can keep Croner-i for its commentary and use Nylon for cited answers.
Can I use Nylon alongside Croner-i?
Yes. Nylon is billed monthly, so you can add it during a Croner-i contract and compare them on your own questions.
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. Croner offers free demos; a free trial of Croner-i isn’t described on Croner’s public pages.
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. Croner-i and Croner Intelligence are trade marks of Croner Limited. 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.