PlansFree; from $20/mo Monthly or annual USD plans

Basic: Free; Limited writing assistance, four monthly credits, and read-only file proofreading results.
Premium Monthly: $20/month; Billed monthly; full writing assistance, editable file proofreading, and ten monthly credits.
Premium Annual: $80/year; Regular annual list price; displayed 40% promotion is $48/year. Ten monthly credits.
Premium Plus: $125/year; Twenty monthly credits and higher AI-writing allowances; the current monthly selector does not offer this plan.
Confidential Data: $500/year; Regular annual list price; displayed 40% promotion is $300/year. Fifty monthly credits and offline grammar checker; team eligibility applies.

Premium is $20/month or regular $80/year; Premium Plus is $125/year. Confidential Data lists regular $500/year with team eligibility. The annual page currently discounts Premium and Confidential Data by 40%.

View current plans

AI & setupAI includedFree Basic plan

Basic includes 5,000 words of writing assistance monthly, four monthly credits, five AI-writing requests, and read-only file edits.

Where it worksWeb, Windows, Browser extensions, Microsoft WordWeb, Windows, browser extensions, Word

Paid Word or LaTeX proofreading can return editable files with tracked changes.

Usage & termsOne file-proofread credit per 5K wordsBasic file results are read-only

Premium supports up to 120 editable proofread files/year; Premium Plus 240, and Confidential Data 600. Credits and AI-writing request limits vary by plan.

The Confidential Data card says unlimited AI writing, while the comparison table lists 3,000 requests/month. The profile follows the table allowance and retains the conflict.

Privacy differs by plan: the table places its no-training commitment on paid plans and real-time deletion on Confidential Data.

Trinka homepage with “Everything You Need to Write Better,” three cards for writing assistance, confidential data, and academic integrity; a cookie-choice panel remains visible at lower left. — Trinka homepage screenshot · captured 3 October 2026 Visit Trinka (opens in a new tab)

Revise prose with its subject in view

Grammar and language checks cover sentence structure, word choice, technical spelling, and formal style. Domain dictionaries recognize terminology in areas such as medicine, engineering, economics, and the social sciences. Subject and document settings, US or UK English, and paid academic style-guide options can make the suggestions more relevant to the manuscript being prepared.

Lite focuses on basic corrections; paid Power Mode adds more substantial grammar and style improvements. These editing modes are documented for English.

Bring recurring forms into agreement

Consistency Check groups variations in spelling, hyphens and dashes, written-out numbers, symbols, spacing, accented characters, and figure or table labels. It also checks statistical notation such as p-values. An author chooses the form to retain, giving a technical or research-heavy book a practical way to address small discrepancies that accumulate across chapters.

The feature page places Consistency Check in the Cloud editor and says it does not consume credits.

Return the edit as a file to review

Proofread File accepts Word and LaTeX manuscripts and supplies a report of language revisions. Paid plans provide an editable file with tracked changes and explanatory comments, so corrections can be accepted or rejected in a compatible word processor. LaTeX processing also provides a Word version showing the edits.

Basic results are read-only. File proofreading uses one credit for every 5,000 words, so a book can require several credits even when writing assistance is unrestricted.

Paraphrasing, citations, and technical checks

Compare wording and examine an argument

Paraphraser supplies multiple alternatives and shows the changes made to the original. The optional AI-assisted writing tools can continue supplied text, draft from notes, rewrite a passage, or analyze an argument's assumptions. These provide another level of revision for an explanation's wording and reasoning.

Standard paraphrasing is available on Basic; other modes and AI-writing request allowances depend on the plan.

Inspect the references behind the prose

Citation Quality Check flags issues such as retracted studies, duplicate references, entries it cannot verify, and possible overuse of one journal. For a research-based nonfiction project, this can direct attention to references that deserve another look. A flagged or older source still needs an author's judgment about its role and relevance.

Add research-submission checks when they apply

Technical Checks reviews research-manuscript elements such as headings, length, references, figures and tables, authorship details, and required declarations. It also offers journal-scope matching. This is a specialized supporting tool for authors preparing scholarly papers alongside a book; its report is a checklist to compare with the publication's actual requirements.

Each report consumes one credit and stays in Trinka Cloud; the feature FAQ says the report cannot currently be downloaded.

Feature details & official sources

Purpose and capability information checked 3 October 2026.

Platform and pricing reference: 24 October 2026.

Recorded requirements and limits

Basic writing assistance is limited to 5,000 words monthly, Lite grammar checking, and Standard paraphrasing; it includes four monthly credits and five AI writing requests.
Proofread File uses one credit per 5,000 words. Basic results are read-only; editable files with tracked changes require a paid plan.
Unused free monthly credits expire; purchased credit packs do not. Reports and file processing can consume credits separately from writing-assistance access.
Power and Lite editing modes are documented for English. Available languages and features differ between tools.
Privacy terms depend on the plan. The pricing table reserves its no-training commitment for paid plans, and its offline grammar checker for Confidential Data.

Information may be inaccurate. Confirm details on the official website. Report errors to [email protected].