AI Writing Tools Compared: Chinese Proofreading, Formal Writing, and English Polish
Compare Xiezuocat, Huolongguo, iFlytek Writing, Biling, Youdao Writing, Grammarly, and QuillBot across four task types — Chinese proofreading, formal documents, English polish, and marketing copy — with privacy and integrity boundaries.
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The label “AI writing tool” covers completely different products: some flag typos and grammar issues sentence by sentence, some generate formal document drafts from templates, some specialize in English grammar and academic polish, and some mass-produce marketing copy. Ranking them all on “who writes best” fails at step one — the right question is which task category yours belongs to, and who is most controllable within it.
This guide compares Xiezuocat, Huolongguo Writing, iFlytek Writing, Biling AI Writing, Youdao Writing, Grammarly, and QuillBot across four task types. Fiction and long-form creative writing are a different workflow and out of scope.
Quick Verdict
| Task | Evaluate first | Backup | What matters |
|---|---|---|---|
| Chinese proofreading and polish | Huolongguo | Xiezuocat | Suggestion-by-suggestion control, office plugin coverage |
| Formal documents and workplace writing | iFlytek Writing | Biling | Template fit; facts approved by a human |
| English grammar and business writing | Grammarly | QuillBot | Grammar accuracy, tone control, team plans |
| English learning and essay feedback | Youdao Writing | QuillBot free tier | Level-appropriate feedback; learning, not ghostwriting |
| Marketing copy at volume | General assistant + templates | Biling | Brand consistency, fact review process |
One universal rule: proofreading tools create value through “suggestions decided by a human”; generation tools create value through “fast drafts owned by a human.” Neither category removes fact-checking or authorship responsibility.
Scope and Method
This article covers five task types — Chinese proofreading, formal writing, English polish, learning feedback, and marketing copy. It does not cover fiction (a separate future topic), the writing capabilities of general assistants (see the Gemini vs ChatGPT vs Claude comparison), or plagiarism/AI-detection services.
The evaluation method is fixed-sample testing: prepare three of your own real documents per task type (not demo text), run the same drafts through each candidate, and count useful suggestions, false positives, and whether rewrites drift in meaning. Features and plans change frequently; official sites are the verification target (access verification attempted 2026-07-24, with some product statuses carried from this site’s tool-page verification of 2026-07-18), and no prices or allowances are pinned.
Chinese Proofreading: Huolongguo and Xiezuocat
Chinese proofreading is the most mature and most verifiable capability in this group: typos, confusable words, punctuation, grammar, redundancy — run your text and you know who is accurate.
Huolongguo Writing (Shannon AI) wins on workflow coverage: web, Windows/macOS/mobile clients, plus Word, WPS, PowerPoint, PDF, and browser plugins — suggestions arrive inside wherever you already write, which is decisive for office scenarios. It handles both Chinese and English, fitting daily polish of reports, emails, and paper drafts.
Xiezuocat offers the same “find issues first, accept or reject each” interaction, with a good reputation for long-form polish and style checks. Note: at July 2026 verification its site showed “system upgrading” to logged-out visitors, so plans, quotas, and team features could not be confirmed from public pages — verify the current logged-in state before purchasing.
Both share one boundary: proofreading means uploading full text. For client materials, confidential documents, and unpublished papers, check data-processing terms first and de-identify where necessary. Accepting a suggestion is an editorial judgment — in legal and medical text, one character is one liability.
Formal Documents and Workplace Writing: iFlytek and Biling
The real need here is “a competent structure from a task type, fast” — template fit beats literary quality.
iFlytek Writing (current entry point huixie.iflyrec.com, built on the Spark model) covers meeting minutes, official documents, work summaries, and press releases, with conversational writing, template writing, and material import. It is good at turning existing material into an editable draft; but templates do not know your organization’s policies. Dates, figures, and quotations in official documents must be approved item by item by the responsible person.
Biling AI Writing takes the scenario-template route with 200+ entrances across workplace, marketing, papers, and résumés — fast first drafts are a real advantage. The risk lives in the same place: complete-looking templates invite skipping the fact-finding. High-stakes templates (papers, bids, contracts) are for understanding structure only, never for direct submission; marketing claims like “AI-trace removal” or plagiarism-check results should not be read as academic-compliance guarantees.
Tencent AI Lab’s Effidit was historically an excellent research prototype in this category, but at July 2026 verification its official site returned 502 and availability could not be confirmed — do not select it currently, and do not download clients from unverified sources.
English Polish: Grammarly and QuillBot
Grammarly remains the benchmark for English grammar, spelling, punctuation, and tone suggestions: mature browser, desktop, and office-suite integrations, and its team plans (central management, style guides) are the real differentiator over free tools for business email and cross-border collaboration. Generative rewriting keeps being added, but its core value is still suggestion-by-suggestion review.
QuillBot started with paraphrasing, plus grammar checking, summarization, and citation tools; its free tier is genuinely usable, making it a common starting point for students and budget-constrained users. The inherent risk of paraphrasing tools deserves naming: rewriting academic text can shift meaning and dilute terminology precision, and using paraphrase to evade plagiarism detection is academic misconduct — the tool does not change that classification.
Both are overseas SaaS; access and payment conditions vary by environment. Users who prefer Chinese interfaces and local payment can cover learning scenarios with Youdao Writing first and evaluate Grammarly for business English.
English Learning and Essay Feedback: Youdao Writing
Youdao Writing (NetEase Youdao) targets Chinese English learners: graded feedback for primary through postgraduate exam levels, photo upload of handwritten essays via the Youdao Dictionary app, and an Edge extension with spelling, grammar, and word-level suggestions. The right usage is the learning loop — find errors, understand suggestions, rewrite yourself — not generating submittable essays. Student names, schools, and essay images are educational data; follow school policy and de-identify before uploading.
Marketing Copy: Build the Process First
The bottleneck in marketing copy is usually not generation but brand consistency and fact review. For volume drafts, use a general assistant (ChatGPT/Claude with your own prompt templates) or Biling’s new-media templates; for overseas campaigns, evaluate dedicated platforms like Jasper and Copy.ai for brand voice and collaboration features.
Whichever route, three supports are required: a brand-voice document (fixed context fed to the tool), a fact sheet (prices, specs, and promises only from authoritative internal sources), and human final review (no tool replaces the responsible person for advertising-compliance wording).
Privacy and Academic Integrity Boundaries
Two red lines deserve their own section:
- Data boundary: proofreading and rewriting mean full-text upload. Before uploading client contracts, unreleased financials, unpublished research, or personal data, read the current privacy terms — training use, retention, deletion; enterprises should prefer plans with data-processing agreements.
- Academic integrity: feedback and polish tools cannot certify originality; disclose AI-generated or heavily rewritten content per your institution’s and journal’s policies; “AIGC-rate reduction” services do not change a text’s actual provenance. The named author answers for the full text — no tool changes that.
Access and Account Requirements
Huolongguo, iFlytek Writing, Biling, and Youdao Writing are domestic Chinese products with complete phone-registration, payment, and invoicing flows. Grammarly and QuillBot are overseas SaaS requiring international payment, with access stability varying by network environment. For team procurement of domestic products, run the registration/payment/API/invoicing checklist in the China-accessible AI tools guide.
FAQ
Which Chinese proofreader is most accurate?
No universal answer, and model updates change results. Test three of your own real documents and count useful suggestions versus false positives — half a day yields more reliable results than any review. Office-plugin coverage is the second criterion; Huolongguo currently has the broadest.
Can general assistants (ChatGPT/Claude) replace these specialized tools?
They replace part of the generation and rewriting work, but not two things: the controllable proofreading interaction (specialized tools let you accept/reject each suggestion) and the office-software-embedded workflow. Conversely, specialized tools trail general assistants at free-form composition. The sensible setup for most people is one general assistant plus one proofreading tool.
Grammarly or QuillBot?
Grammar checking and business writing first — Grammarly. Paraphrasing focus and tight budget — QuillBot. In academic settings both only polish language; methods and citations remain your responsibility.
Is AI polish on a paper academic misconduct?
Language polish is acceptable under most institutional policies with disclosure requirements; having AI generate content, fabricate citations, or paraphrase to evade plagiarism checks is clear misconduct. Follow your institution’s and target journal’s current policy; when unsure, disclose.
Can official documents be AI-generated directly?
Use AI for structure and first drafts, but facts, figures, policy citations, and wording in official documents must be approved item by item before issuance. AI-generated dates and numbers fail often enough that such errors in official documents are incidents, not typos.
Is the free tier enough?
For light proofreading and learning, usually yes. Pay when three signals appear: daily limits actually interrupt work, you need office plugins or team collaboration, or you need commercial licensing and invoices. Run two weeks of real documents on the free tier first.
Official Sources and Verification
- Huolongguo Writing: official site and client download pages, access verification attempted 2026-07-24.
- Xiezuocat: official site (logged-out visitors see “system upgrading”; status carried from 2026-07-18 verification), access verification attempted 2026-07-24.
- iFlytek Writing: current entry huixie.iflyrec.com, access verification attempted 2026-07-24.
- Biling AI Writing: ibiling.cn, access verification attempted 2026-07-24.
- Youdao Writing: official site and Edge extension page, access verification attempted 2026-07-24.
- Grammarly: grammarly.com, access verification attempted 2026-07-24.
- QuillBot: quillbot.com, access verification attempted 2026-07-24.
Features, plans, and data terms change frequently; this article pins no prices or allowances. Before purchasing or uploading sensitive material, the official pages and terms of that day govern.
Bottom Line
Sort by task first: Huolongguo and Xiezuocat for Chinese proofreading, iFlytek and Biling for formal workplace writing, Grammarly for business English, QuillBot for paraphrasing on a budget, Youdao Writing for English learners, and process-before-tools for marketing copy. Half a day of fixed-sample testing with your own documents beats any leaderboard. And keep the two invariants: check data terms before uploading sensitive material, and the named author answers for the full text — no tool carries either burden for you.