River
Y CombinatorBacked by Y Combinator

AI Writing Tools

Each one opens on the writing task in front of you, not on a blank chat box.

Add 40 conversion optimization comments

Get 40 targeted conversion comments on your landing page or sales copy. AI adds specific optimization suggestions without rewriting. Perfect for marketers. Start free.

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Add 40 journalism comments instantly

Add 40 AP-style and clarity comments instantly. AI adds targeted journalism feedback without rewriting. Perfect for editors and writers. Start free.

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Add 40 winning comments to your proposal

Add 40 proposal-winning comments instantly. AI improves proposals without rewriting. Perfect for every freelancer. Start free.

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Add 50 technical writing comments

Add 50 technical writing comments instantly. AI adds targeted feedback without rewriting. Perfect for technical writers. Start free.

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Add fact-check comments to claims

Add fact-check comments instantly. AI web-searches claims and adds source or disputed comments. Perfect for fact-checkers. Start free.

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Add reflection to your essay

Find where your essay needs more reflection. AI marks spots missing depth and insight. For college and grad applicants. Start free.

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Add structural comments to manuscripts

AI adds inline structural feedback to manuscripts: pacing notes, transition suggestions, scene development opportunities, and narrative arc guidance.

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Add transition sentences between sections

Add smooth transition sentences instantly. AI bridges sections with natural connections. Perfect for long-form writers. Start free.

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AI Fanfiction Generator for Complete One-Shots

Free AI fanfiction generator for complete 3,000-word one-shots. Enter fandom, pairing, and prompt — get full plot, dialogue, and ending for AO3. Start free.

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AI Standard Operating Procedure Generator

Describe a process in your own words and get a standard operating procedure a new hire can follow, plus a register of the other SOPs your business needs.

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Analyze voice match between draft and client

AI analyzes how well ghostwritten content matches client's authentic voice patterns. Compares draft against reference samples with detailed feedback.

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Appeal a prior authorization denial

AI drafts complete prior authorization appeal letters addressing payer denial criteria, step therapy requirements, and clinical justification. For physicians and billing staff. Start free.

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Build complete character profiles in minutes

Build deep, believable characters instantly. AI generates complete 50-question character profiles with backstory, motivation, and arc. Perfect for novelists. Start free.

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Build complete fantasy worlds instantly

Generate complete 2,000-word world-building bibles instantly. AI creates magic systems, geography, culture from your world name and rules. Perfect for fantasy authors. Start free.

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Calculate appropriate ghostwriting rates

Calculate appropriate ghostwriting rates for books, articles, speeches. Factors in complexity, research, timeline, expertise to ensure profitable pricing.

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Catch every spelling error and typo

Find every spelling error and typo instantly. AI adds only spelling and typo comments. Perfect for all writers before submitting. Start free.

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Check for authentic voice

Check if your essay sounds like AI wrote it. Get warnings where voice feels artificial. For all applicants. Start free.

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Check spelling and Latin terms

Check spelling and Latin phrases in legal documents instantly. AI finds typos and incorrect Latin usage. Perfect for law students and attorneys. Start free.

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Check spelling and typos in pitch materials

Find and fix spelling errors and typos in startup pitch decks. AI catches mistakes that hurt credibility. Perfect for polishing pitches. Start free.

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Check voice consistency in ghostwritten manuscripts

AI checks ghostwritten manuscripts for voice consistency. Identifies sections where voice drifts from client patterns. Ensures authentic voice throughout.

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Check your essay for red flags

Scan your essay for serious issues before submitting. AI highlights clichés, vague language, and common mistakes. For all applicants. Start free.

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Check your word and character count

Check if your essay meets word and character limits. Instant count for Common App, AMCAS, and all applications. For all applicants. Start free.

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Competitor Playbook Built From Their Website

Give it a competitor's website and get a full teardown: what they sell, their pricing, customer complaints, search rankings, and specific ways to beat them.

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Construction Punch List Generator From Notes

Turn walkthrough notes into an organized punch list, sorted by room and trade, with a trackable spreadsheet and a summary for the owner or lender.

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Contractor vs Employee Classification Check

Answer eight questions about how someone works and get a written classification analysis against the federal tests and your state's rules, plus what to fix.

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Convert jargon to plain language

Convert nonprofit jargon to donor-friendly language. AI rewrites complex terms in plain language. For fundraising & communications. Free.

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Create a Complete Employee Handbook in 20 Minutes

Create a professional employee handbook in 20 minutes. AI writes all 15 sections: policies, benefits, code of conduct, and compliance. Used by 1,000+ companies.

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Create a full 30-day content calendar

Generate complete 30-day content calendar with titles and descriptions. AI creates full month of content ideas organized by day. Perfect for social and newsletter planners. Start free.

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Create a patient education handout

AI writes 2-page patient education handouts in plain language. Enter condition, get professional handout instantly. For nurses and health coaches. Start free.

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Create a value proposition canvas

AI writes complete value proposition canvases. Enter product details, get 1-page canvas with customer pains and gains instantly. For product marketers. Start free.

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Create allergy and medication reconciliation tables

AI creates organized tables for allergies and medication reconciliation. For nurses and pharmacists. Start free.

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Create an Investor One-Pager in 5 Minutes

Create a professional investor one-pager in 5 minutes. AI asks about your startup, then writes a scannable summary investors actually read. Used by 2,000+ founders.

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Create competitive landscape table

Create competitive comparison table from your competitors. AI builds perfect competitive analysis for pitch deck. Perfect for all founders. Start free.

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Create medication list table

AI creates organized medication list tables with dose, route, frequency. For nurses and pharmacists. Start free.

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Create partnership outreach email and one-pager

AI writes partnership outreach emails and one-pagers. Enter partner details and win-win, get email plus one-pager instantly. For founders and sales. Start free.

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Create professional ghostwriting style guides

Create professional style guides documenting client voice, vocabulary, sentence patterns, and writing preferences. Essential tool for voice consistency.

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Create treatment plan with SMART goals

AI writes complete treatment plans with SMART goals. Enter diagnosis, get comprehensive plan instantly. For therapists and psychiatrists. Start free.

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Create your annual impact report

Generate complete nonprofit annual reports with impact stories and statistics. AI writes 10-page reports showcasing your year. For executive directors. Free.

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Create your case for support

Generate complete case for support documents for fundraising campaigns. AI writes campaign one-pagers with compelling case statements. For fundraising teams.

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Create your donor cultivation series

Generate complete major donor cultivation email series. AI writes 3-letter sequence for donor stewardship. For development staff. Start free.

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Create your program impact report

Generate complete program impact reports with metrics and stories. AI writes 8-page reports with data visualization text. For program managers. Free.

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Create your program one-pager

Generate 1-page program summaries for any nonprofit program. AI writes complete one-pagers. For program managers. Free.

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Create your volunteer training manual

Generate complete volunteer training manuals for any role. AI writes 15-page manuals with procedures and guidelines. For volunteer coordinators. Free.

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Decode denials and draft appeals

AI analyzes insurance denials and EOBs, explains denial reasons, and drafts appeal letters. For medical billers and physicians. Start free.

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Document family meeting summary

AI writes complete family meeting summaries documenting goals of care discussions. For palliative care and physicians. Start free.

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Draft a medical insurance appeal letter

AI drafts medical necessity appeal letters, prior auth appeals, and claim denial responses. For physicians and medical billers. Start free.

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Draft prior auth letters and LMNs

AI drafts letters of medical necessity, prior auth narratives, and payer portal answers. For physicians and clinical staff. Start free.

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Eliminate jargon and buzzwords from pitch materials

Find and eliminate jargon and buzzwords in startup pitch decks. AI highlights vague terms that hurt clarity. Perfect for all founders. Start free.

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