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AETHYRO CLOUD · ONLINE  ·  Claude Opus 5  ·  No install required

Your AI assistant.
Powered by
Claude Opus 5.

Aethyro is a cloud AI assistant powered by Claude Opus 5 — Anthropic's most capable model. Ask it to write code, research your documents, review a contract, or plan your next move. No install. No subscription. Opens in your browser in seconds.

200 free credits on signup  ·  no credit card  ·  your data never sold
Start Free — No Card → See Pricing →
// 200 free credits on signup · or try right now below with no account
Try Aethyro Cloud right now — no signup
3 free messages/day · runs in Aethyro Cloud on our servers, not on your device
Opus5Model tier
200Free credits
PayAs you go
0Data sold
Aethyro · cloud assistant
Summarize the risk clauses in this NDA.
Aethyro3 risks: uncapped indemnity (§4.2), auto-renew with only 30-day notice (§9), governing law conflict (CA vs. DE). Full breakdown below.
Draft a reply pushing back on §4.2.
AethyroDraft ready — indemnity capped at 12 months' fees, mutual carve-outs for gross negligence, redlines attached.
Message Aethyro…
cloud · Claude Opus 5 · streaming
How it works

Up and running in
60 seconds.

No downloads, no API keys, no credit card. Just sign up and start asking.

01

Sign up free

Create an account in 10 seconds. 200 free credits land instantly — no card, no commitment.

02

Ask anything

Code, research, contracts, writing, planning — just describe what you need. Claude Opus 5 handles the rest.

03

Top up when ready

Buy credit packs as you go. They never expire. No monthly pressure, no subscription anxiety.

Try it free — 200 credits →
Why Aethyro

One assistant.
Zero BS.

No six subscriptions. No monthly pressure. No surprise bills. No data sold. Just Claude Opus 5, ready when you are.

🔒

Your data, never sold

Your queries go to Anthropic's Claude API to generate your response only. Aethyro never sells your data and Anthropic has a strict no-training policy on API inputs.

💬

One assistant, every job

Code, document research, contract review, documentation, strategy — one place to ask, instead of juggling six different tools and subscriptions.

💳

Credits that never expire

Buy a credit pack, use it whenever. No monthly pressure, no surprise invoices. Start free with 200 credits — no card required.

⚡

State-of-the-art model

Powered by Claude Opus 5 — Anthropic's most capable model. Not a cost-cutting tier. No install, no GPU, no setup. Works in any browser.

What it handles

Ask it anything.
One conversation.

Aethyro is a single intelligent assistant powered by Claude Opus 5. There's nothing to configure — just describe what you need and it gets to work.

Start free →
💻
Code & Engineering
Write, review, debug, and document code. Python, JavaScript, TypeScript, SQL, and more. Security reviews against OWASP Top 10 included.
📄
Documents & Research
Summarize contracts, extract key clauses, compare documents, and answer questions about your files — with citations.
✍️
Writing & Drafting
Emails, proposals, reports, SOPs, marketing copy, legal correspondence drafts — clear and ready to edit.
🎯
Strategy & Planning
Go-to-market plans, pricing strategy, competitive analysis, 90-day roadmaps. Structured and direct, not generic.
🔢
Analysis & Data
Interpret spreadsheets, financial statements, research data, and survey results. Explain the numbers, not just repeat them.
🗂️
Workflows & Processes
Break complex tasks into clear steps. Build SOPs, checklists, project plans, and intake forms for any business process.

// powered by Claude Opus 5 · one conversation handles all of it

See it work

What Aethyro actually does.

Pick a role — see real example tasks and the kind of output you get back. Powered by Claude Opus 5 in your browser.

Code
You askWrite a Python HTTP GET with retries + exponential backoff.
Aethyro returnsdef get_with_retry(url, retries=4, base=0.5): for i in range(retries): try: r = requests.get(url, timeout=10) r.raise_for_status(); return r except requests.RequestException: if i == retries - 1: raise time.sleep(base * 2 ** i)
// example output · Claude Opus 5
Security review
You askReview this login handler for vulnerabilities.
Aethyro returnsHIGH — SQL injection (CWE-89) user input concatenated into query. Fix: parameterized query / ORM binding. MEDIUM — no rate limit on /login (OWASP A07) Fix: lockout after N attempts.
// references OWASP Top 10 + CWE
Documentation
You askDocument this module as a README.
Aethyro returns# payments Idempotent Stripe checkout + webhook. ## Usage create_checkout(plan="cpa") ## Webhook events - checkout.session.completed → mark active - subscription.deleted → revoke
// markdown, with examples
Tax research
You askIs a home-office deduction allowed for a W-2 employee in 2025?
Aethyro returnsGenerally no. TCJA suspended unreimbursed employee expenses (incl. home office) through 2025 under IRC §67(g). Exceptions: certain reservists, performing artists, fee-basis officials. Self-employed (Sch. C) still qualify.
// grounded in IRC/regs · Claude Opus 5
IRS correspondence
You askDraft an IRS penalty-abatement request (first-time).
Aethyro returnsRe: Request for First-Time Abate, TY2024 Taxpayer has a clean 3-yr compliance history and filed/paid in good faith... [full letter]
// editable draft · client data never leaves the office
Document Q&A
You askWhat's the depreciation method in this client's prior return?
Aethyro returnsMACRS, 7-yr, half-year convention (source: 2023 return, Form 4562, line 19c).
// answers from your files, with citations
Contract research
You askSummarize the key risks across these 40 contracts.
Aethyro returns3 themes: (1) uncapped indemnity in 11 docs, (2) auto-renew w/ 90-day notice in 18, (3) governing law split CA/NY/DE. Each w/ doc + clause citation.
// multi-doc research with citations
Workflow planning
You askBuild me a diligence workflow for this data room.
Aethyro returns1 extract + classify docs 2 flag risk clauses 3 assemble memo deps mapped, runs in sequence.
// routes the work internally
Go-to-market strategy
You askGive me a 90-day GTM plan for a new SaaS product targeting small businesses.
Aethyro returnsKickoff — pick 1 vertical (accounting firms) Align — "saves 5 hrs/week" message Implement— free trial → paid funnel live Refine — 5 design-partner calls Optimize — double down on best channel Scale — case studies → paid ads
// structured, actionable plan
Pricing strategy
You askShould I price per-seat or flat?
Aethyro returnsCredit packs win. Buyers fear monthly AI bills; pay-as-you-go lowers friction. Add a subscription tier only when usage patterns are well established.
// reasoned recommendation
Try it

Ask it anything.

A taste of your private assistant. Tap a question — or chat for real in Aethyro Cloud →

Aethyro · private assistant cloud · Claude Opus 5
AethyroAsk me about strategy, pricing, security, or going to market. Tap a question below.
// scripted preview · the real product streams from Claude Opus 5 in Aethyro Cloud
Skip the script — chat for real, free →
// Aethyro Cloud · 200 free credits, no card required
Pricing

Simple credit packs.
No subscriptions needed.

Buy credits, use them when you need them. Credits never expire. Start free with 200 credits.

Full comparison & FAQ →
Starter
// try it out
$4/pack
  • ✓ 200 credits
  • ✓ Claude Opus 5
  • ✓ Never expire
Buy credits →
Value
// regular users
$10/pack
  • ✓ 600 credits
  • ✓ Claude Opus 5
  • ✓ Never expire
Buy credits →
Best value
Power
// heavy users
$30/pack
  • ✓ 2 000 credits
  • ✓ Claude Opus 5
  • ✓ Never expire
Buy credits →
Pro
// teams & professionals
$90/pack
  • ✓ 7 000 credits
  • ✓ Claude Opus 5
  • ✓ Never expire
Buy credits →

// 200 free credits on signup · no credit card · credits never expire

Start Free

Sign up and get 200 credits instantly — no credit card needed. Chat with Claude Opus 5 right in your browser, then top up whenever you need more.

Get started free →
Why us

How we compare.

Honest breakdown. We're not the right fit for everyone — but for most people, the math is pretty clear.

Aethyro ChatGPT Plus Claude.ai Pro
Model quality Claude Opus 5 GPT-4o Claude Opus 5
Monthly subscription ✓ None $20/mo $20/mo
Credits that never expire ✓ Yes ✗ ✗
Pay only when you use it ✓ Yes ✗ Always charged ✗ Always charged
No data used for training ✓ Guaranteed Opt-out required ✓ Guaranteed
No install required ✓ Browser only ✓ ✓
Free credits on signup ✓ 200 credits ✗ Limited trial
Cost calculator

What would you actually pay?

Move the slider — see your real monthly cost vs a $20 subscription. No tricks.

I have about 12 conversations per week  ·  ~52 / month
Aethyro
—
ChatGPT Plus
$20
Claude.ai Pro
$20

// ~10 credits per conversation · Value pack rate ($0.0167/cr) · actual cost varies by message length

Start Free — 200 credits, no card →
Zero data training
Your queries generate your response only. Anthropic has a strict no-training policy on API inputs.
Credits never expire
Buy once, use whenever. No monthly pressure. Top up only when you need more.
State-of-the-art model
Powered by Claude Opus 5 — Anthropic's most capable model, not a smaller cost-cutting tier.
Browser-based
Nothing to install, update, or configure. Open it, type, done. Works on any device.
What people say

Real users.
Real results.

★★★★★
"I threw a 90-page vendor contract at it and asked for the top risk clauses. It came back in under a minute with accurate citations. That would have taken my paralegal two hours."
MR
Marcus R.
// Startup Founder
★★★★★
"The credits never expire thing is huge. I use it in bursts — intensive research for a week, then nothing for a month. ChatGPT was billing me $20/mo while I wasn't even logging in."
SL
Sophia L.
// Independent Consultant
★★★★★
"I asked it to review my Python repo for security vulnerabilities. It found three real issues with code suggestions to fix them. One of them was a subtle SQL injection I'd missed for months."
DK
Dev K.
// Senior Engineer
The Aethyro Dispatch

AI that actually works,
every week.

Real talk on AI tools, model updates, what's worth your time (and what's overhyped), and practical workflows you can steal. Free. No spam. No corporate fluff.

Read the Dispatch →
// Issue #1 live now · new issues every 1–2 weeks
Community

Build with AI together.

Join other Aethyro users to share setups, get help, and stay ahead of what's working in private AI.

Join the Discord →

// early community · be a founding member

FAQ

Common questions.

Aethyro is a cloud AI assistant powered by Claude Opus 5, running in your browser. No install, no subscription. You get 200 free credits on signup, then buy more as you need them — they never expire. One assistant handles code, research, writing, contract review, and strategy.
Your queries go to Anthropic's Claude API only to generate your response. Aethyro never sells your data. Anthropic has a strict no-training policy on API inputs — your conversations are never used to train future models.
Credits are consumed per message. A typical conversation uses roughly 1–5 credits per exchange depending on length. You start with 200 free credits. When you need more, buy a pack — Starter (200cr/$4), Value (600cr/$10), Power (2000cr/$30), or Pro (7000cr/$90). Credits never expire.
Nothing. Aethyro runs entirely in your browser — Chrome, Firefox, Safari, Edge. No app, no extension, no API key setup. Works on desktop and mobile.
Claude.ai and ChatGPT charge a flat $20/month whether you use them or not. Aethyro uses a credit model — you only pay for what you use, and credits never expire. If you're a light or bursty user, you'll pay a fraction of what you would on a subscription. You still get Claude Opus 5 — the same top-tier model.
Yes. There's no restriction on commercial use. Many users use Aethyro for client work, code review, contract analysis, and business writing. For team access or enterprise pricing, email [email protected].
Get Started

Private AI in
your browser. Start free.

Sign up and get 200 free credits — no credit card. Start chatting with Claude Opus 5 in seconds.

Start for Free → Talk to us

// no card required · 200 free credits · response within 24 hours