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52 free tools
for founders.

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

// tools.opai.one
52
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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Marketing · Free
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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Community · Free
Community Welcome Generator
Slack, Discord, or Circle. Public welcome + auto-DM + first-3-channels + a week-1 ritual — tone-tuned and platform-formatted. 30 seconds, no signup.
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Pricing · Free
Pricing Tier Generator
Type product type, ICP, price floor, and 3-5 features. Get a Starter / Pro / Enterprise structure with feature splits, pricing math, and an anchor line — paste it straight onto your pricing page.
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Marketing · Free
OG Image Description Writer
Type a page title, pick a page type and tone. Get 9 outputs — 3 alt-texts under 120 chars, 3 captions under 200, 3 OG headlines under 60. Pass the alt-text test and ship the card.
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Marketing · Free
Webinar Landing Page Generator
Type your title, speaker, date, three takeaways, and a CTA goal. Get a paste-ready HTML block, a Markdown version for Notion or your blog, and a social caption tuned to your audience.
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Compliance · Free
Refund Policy Generator
Pick your product type, refund window, proration policy, and tone. Get a paste-ready HTML block, a plain-text version for your ToS, and a Markdown version for Notion. SaaS, course, coaching, e-commerce, service, or tool.
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Compliance · Free
Privacy Policy Generator
Pick the data you collect, the processors you use, and your jurisdiction. Get a paste-ready HTML block, plain text for your ToS, and Markdown for Notion. GDPR rights block auto-included for EU/UK. Each processor links to its own privacy policy.
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SaaS · Free
SaaS LTV Calculator
Plug in monthly ARPU, gross margin, churn, and CAC. Get LTV across three methods (simple, DCF-discounted, payback-based), LTV:CAC ratio with traffic-light grading, payback period, and a 36-month cohort curve. 100% client-side — nothing leaves your browser.
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Discovery · Free
Customer Interview Question Generator
Pick product type, audience, interview goal (validate problem / solution / pricing / churn / win-loss), and call length. Get a JTBD + Mom Test-flavored question pack — warm-up, past behavior, specific story, pricing, closing — tailored to the combo. HTML, Plain text, Markdown, Notion-paste.
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SaaS · Free
SaaS Churn Cohort Analyzer
Paste 6–12 months of cohort retention data, pick your business model (B2B SaaS / B2C / Marketplace / Course / Newsletter), drop in ARPU + CAC. Get M1/M3/M6/M12 grading vs benchmark, leaky-bucket diagnosis (activation vs value-delivery vs habit), the dollar cost of every 1pp of churn, and 5 prioritized fixes. CSV export for the parsed table.
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Strategy · Free
Founder Quarterly OKR Generator
Pick stage (Pre-revenue / Pre-PMF / Post-PMF / Scale), top focus (Revenue / Retention / Activation / Distribution / Operations / Product velocity), team size, and a 1-line strategic theme. Get 3 Objectives — one Stretch, one Committed, one Hygiene — with 9 measurable Key Results templated as [fill: target] placeholders so you never publish hallucinated numbers. Markdown / Plain text / HTML output.
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Conversion · Free
Landing Page Above-Fold Audit
Paste your above-fold copy, pick audience (SaaS / E-commerce / Course / Service / Creator / B2B Enterprise) and primary goal (Demo / Signup / Sale / Email / Reply). Heuristic engine scores 8 weighted dimensions — Hook clarity, Specificity, CTA visibility, Social proof, Friction, Visual anchor, Density, Trust — with audience- and goal-aware weight lifts. Get a 0–100 grade (A–F), 4 wins, and 5 prioritized fixes with concrete rewrite suggestions, not generic advice. 100% client-side.
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Metrics · Free
Net Revenue Retention Calculator
Plug in starting MRR, expansion, contraction, and churned MRR. Get a color-coded NRR % (top decile / world-class / healthy / leaky / critical), GRR % alongside, a breakdown table showing each input as % of starting MRR, SaaS benchmarks (median ~110%, top decile >130%), and a copy-as-Markdown button that emits a board-ready snippet (“**Q3 NRR: 118%** · GRR: 96% · Expansion +$24k · Contraction −$3k · Churn −$5k · Starting MRR $180k”). Inline validation flags when contraction + churn exceed the cohort baseline. 100% client-side.
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Metrics · Free
Burn Multiple Calculator
Plug in beginning ARR, ending ARR, and net burn (Quarter or Annual). Get your Burn Multiple with color-coded band per the Sacks/Bessemer framework — Amazing (≤1.0) / Great (1.0–1.5) / Good (1.5–2.0) / Suspect (2.0–3.0) / Bad (>3.0). Side panel shows net new ARR + capital efficiency in “ARR per $1 burned” terms. Copy-as-Markdown emits a board-ready snippet. Handles ARR contraction gracefully (no division-by-zero blow-ups). 100% client-side.
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Retention · Free · NEW
Customer Health Score Calculator
Drop in your book of business. Score each account 0–100 across 5 axes — login frequency, feature adoption, support tickets, NPS, payment health. Get a ranked at-risk list, traffic-light bands (Healthy 70+ · Watch 40–69 · At-risk <40), three summary cards counting each band, and a board-ready Markdown export your CSM team can paste in the QBR. Three demo sets cycle through realistic books. 100% client-side.
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Strategy · Free
ICE Score Calculator
Type your idea list. Score each by Impact, Confidence, Ease (1–10). Get a ranked winner card with the score gap to #2, gold/silver/bronze rank pills, the “biggest axis” reason it won, and a Markdown export your team can paste into the meeting notes. Tied scores tiebreak on Ease so cheap-to-ship wins ties. Includes a 60-second “Why ICE” explainer (Sean Ellis framework, RICE relationship). Demo button cycles 3 example sets (growth team, startup founder, enterprise PM). 100% client-side. No signup.
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Email · Free
Cold Email Subject Line A/B Tester
Drop in two cold-email subject lines. We score each across 6 dimensions — length, curiosity-gap, specificity, personalization, spam-safety, and action-clarity — weight them, and pick a winner. You get a winner card with a one-paragraph “why this wins” justification, the score gap, the canonical 30-word spam-trigger detector w/ inline flags, char-count meta with mobile-truncation warnings, and a concrete fix for the loser (e.g. “loser’s biggest gap is specificity — replace ‘Quick question’ with the exact topic”). Demo button cycles 4 distinct example pairs. Copy as Markdown export. 100% client-side.
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Email · Free
Customer Onboarding Email Sequence Generator
Drop in product name, customer pain, trial-vs-paid, and audience. Get a 5-email onboarding sequence — Day 0 Welcome (warm-and-direct, one activation step), Day 1 Quick-win (5-minute activation push), Day 3 Customer story (synthetic-but-plausible quote shaped to your audience, marked as “replace with real customer”), Day 5 Feature deep-dive (the compounding feature for your audience), Day 14 Trial-end nudge or Expansion ask (branches on type). Each email ships w/ subject + 80–120 word body + CTA. Copy as Markdown or table-based responsive HTML email markup w/ inline styles. 100% client-side.
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Conversion · Free
SaaS Pricing Page Headline Generator
Drop in product, audience, positioning, and primary CTA goal. Get 9 pricing-page headlines across 3 voices — Specificity (concrete claim w/ audience + win), Contrarian (reject the norm, pick a fight w/ the alternative), Outcome-led (lead with the result). Each headline ships w/ a subhead and 3 CTA button-copy options matched to your CTA goal (Start-trial / Book-call / Buy-now / Watch-demo). Markdown + JSON exports. 100% client-side.
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Strategy · Free
ICP Definition Worksheet Generator
Drop in your product, target company size, industry, buyer title, budget signal, trigger event, and disqualifier. Get a structured ICP doc — one-paragraph summary, firmographics with industry-specific tech-stack signals, separated buying-trigger and disqualifier panels, and a curated “where to find them” list per industry (Product Hunt, /r/SaaS, EdSurge, HIMSS, Klaviyo Slacks — whichever fits). Copy as Markdown for the team doc, or as JSON for CRM import. 100% client-side.
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Outreach · Free
Cold DM Opener Generator
Pick a platform (LinkedIn, Twitter/X, Instagram, Email), drop in their recent post, name your offer. Get 9 platform-respecting openers across 3 hook angles — question, observation, value-drop — with character limits enforced. Never invents facts about the recipient.
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Content · Free
Founder LinkedIn Post Generator
Pick an angle (lesson learned, behind-the-scenes ship, customer story, hot take, build-in-public), drop your real number, get 3 LinkedIn posts under 1200 chars with different opening hooks. Strips em-dashes, "thoughts?" CTA, and "Hot take:" leads — the four AI tells that kill engagement. Never extrapolates your number.
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Fundraising · Free
Investor Update Email Generator
Type a headline metric, 3 wins, 1-2 lowlights, and one specific ask. Get a paste-ready monthly investor email — subject + TL;DR + highlights + lowlights + by-the-numbers + ask. Tone-calibrated (Confident / Candid-in-trouble / Steady-state). Anti-AI-tell scrubber strips the dead giveaways.
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Fundraising · Free
Founder Pitch Deck Outline Generator
Pick stage (Pre-seed → Series B+) and business model (SaaS / Marketplace / DTC / Hardware / Service / OSS). Get a 12-slide outline — Title, Problem, Solution, Why Now, Market, Product, Traction, Business Model, Competition, Team, Ask, Vision — each with 3 talking points, an investor-lens line, and a stage-tuned tip. Copy as Markdown, HTML, or talking-points only.
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Onboarding · Free
Slack New Hire Welcome Generator
Type the new hire's name, role, start date, and your top-3 channels. Get three Slack-ready welcome messages — warm, professional, playful — each ≤2000 chars, anti-AI-tell scrubbed (no em-dashes, no "I'm excited to share", no "leverage"). Copy and paste.
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Outreach · Free
Cold DM Hook Generator
Pick a platform (LinkedIn / Twitter / Instagram) and a hook style — Question, Compliment-pivot, Specific-observation, Mutual-connection, or Pattern-interrupt. Get five cold DMs under the platform char limit, anti-AI-tell scrubbed, single-question close. Never a pitch in the first message.
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Onboarding · Free
Welcome Email Sequence Generator
Pick a tone (Founder-Direct, Brand-Polished, Casual-Friendly), describe your product and ICP. Get a 5-touch onboarding sequence — Day 0 / 2 / 5 / 9 / 14 — with subject, preheader, and body for each. Anti-AI-tell scrubbed, character-metered, drops into any ESP. Never the generic "thanks for signing up" template.
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