Powered by OPAI

25 free tools
for founders.

Twenty-five single-purpose tools. No signups. No paywalls. Each one solves one specific problem in 30 seconds.

// tools.opai.one
26
Tools
0
Signups required
~30s
Avg time-to-result
100%
Free, forever
Copywriting · Free
Headline Score Checker
Paste any headline. Get an instant 0–100 score across 5 dimensions, plus rewrite tips.
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Workforce · Free
Hire Cost Calculator
AI employee vs human hire. Real US salary data, role by role. See breakeven in seconds.
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Money · Free
Money Personality Quiz
5 questions, 60 seconds. Find your money archetype + the one move that changes everything.
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AI Tools · Free
AI Stack Audit
Pick the AI tools you use. See gaps, overlaps, and what to fix first.
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AI Cost · Free
AI Cost Calculator
Plug in prompt volume + model. See your real monthly bill across Claude, GPT, and Gemini.
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Productivity · Free
Founder Standup Generator
Type yesterday's wins, blockers, and today's plan. Get a clean Slack/email/text update.
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Personal Brand · Free
Bio Optimizer
Paste your LinkedIn or X bio. Get 3 rewrites — Authority, Story, Contrarian — tuned for the platform's char limit.
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Conversion · Free
Pricing Page Roast
Paste your pricing page text. Get a 0–100 score, 3 wins, 5 issues, and specific fixes.
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Email · Free
Subject Line Tester
Score your subject across 6 dimensions. See the inbox preview before you hit send.
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Naming · Free
Domain Name Scorer
Paste 5 candidate domains + your niche. Get a 0–100 score across length, memorability, niche fit, TLD, brandability, and competition.
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Career · Free
Resume Tailor
Paste your resume + the job description. Get a match score, missing keywords, and 5 weak bullets rewritten with action verbs.
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Career · Free
Cover Letter Forge
Paste a JD + your wins. Pick a voice — Direct, Story, or Specialist. Get a cover letter that doesn't sound like ChatGPT wrote it.
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Billing · Free
Quick Invoice
Send a clean invoice in 60 seconds. No signup. Auto-numbered, multi-currency, real PDF download with your logo.
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PR · Free
Press Release Forge
Funding, launch, or partnership? Get an AP-format press release in 90 seconds. Fluff filter strips clichés. Copy or download.
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Hiring · Free
Job Post Optimizer
Paste your job posting. Score it across 8 dimensions. Get a rewritten, magnetic, ATS-friendly version that actually attracts candidates.
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Lifecycle · Free
Onboarding Sequence Gen
Paste your product, audience, and goal. Get a 5-email onboarding sequence — welcome, quick-win, proof, friction-fix, upgrade-nudge. Subject, body, CTA, send-day for each.
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SEO · Free
GEO Visibility Scorer
Score how citable your page is to ChatGPT, Perplexity, and Gemini. 6 GEO dimensions, A+/F grade, concrete fixes.
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Outreach · Free
Cold Email Grader
Score subject + hook + CTA + spam risk before you hit send. 7 dimensions, top-3 issues with quoted text + fix.
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Conversion · Free
Offer Clarity Scorer
Paste your offer/hero/lede. Score 5 axes — specificity, audience fit, urgency, uniqueness — strip clichés.
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AI · Free
AI Prompt Grader
Score your ChatGPT/Claude prompt across 6 dimensions. Get model-aware upgrade suggestions with copy-paste examples.
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Pricing · Free
Freelance Rate Calculator
Calculate your real minimum hourly rate at 4 margin levels — survival, sustainable, healthy, premium. Stop underpricing.
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Email · Free
Subject Line A/B Predictor
Paste 2-5 cold-email subject lines. Get the predicted winner with concrete why, and a rewrite for the weakest. 6 dimensions.
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Founder · Free
Monthly Investor Update Generator
Type 5 KPIs, 3 wins, 2 risks, 1 ask. Get a clean update — markdown + plain text — sorted by impact, ready to paste into Gmail or Pulse.
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Outreach · Free
Cold Email Template Generator
Tell us your industry, role, value prop, pain, and CTA. Get a 5-touch sequence — Day 0, 3, 7, 12, 25 — with subject + body + send-timing + the reasoning behind each touch.
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SEO · Free · NEW
SaaS Comparison Page Generator
Type your product, your competitor, and 5 dimensions. Get a comparison table, verdict paragraph, three switching-cost bullets, and an SEO meta description — in steel-man, honest, or aggressive tone. Copy as HTML or Markdown.
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// new tools every month

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No marketing fluff — just one email per new tool, plus the occasional founder-tactical breakdown of what we built and why.