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Pay as You Go

No monthly subscription required. Purchase request packs that never expire and use them at your own pace.
Perfect for: Occasional users, side projects, or supplementing your Pro plan during busy months.

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Request Packs

Purchase request credits without a monthly subscription:

100 Requests

$100$1.00 per request
  • No monthly commitment
  • Never expires
  • Use at your own pace
  • Add more anytime

500 Requests

$450$0.90 per request
  • 10% savings
  • No monthly commitment
  • Never expires
  • Best value for occasional use

1,000 Requests

$800$0.80 per request
  • 20% savings
  • No monthly commitment
  • Never expires
  • For high-volume occasional users
Top-up credits never expire! Use them over weeks, months, or even years. Perfect for variable workloads.

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What’s Included

Base Model Access

Full access to Mathcad Module and all building codes (ACI, AISC, ASCE, etc.)

Self-Learning

Agent adapts to your style over time, even without monthly subscription

Email Support

Technical support for all users (24-hour response time)

No Expiration

Request credits roll over indefinitely - use them whenever you need

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Limitations

Pay as you go does NOT include:
  • Private Knowledge Base (Pro plan only)
  • Team collaboration features
  • Usage analytics dashboard
  • Beta access to RISA 3D and SAP2000 modules
  • Priority support
For these features, upgrade to Pro plan.

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How It Works

1

Create Account

Sign up for free at app.stru.aiNo credit card required to start
2

Purchase Request Pack

Buy a request pack that fits your needs
  • 100, 500, or 1,000 requests
  • Instant activation
  • Secure payment via credit card
3

Start Using Stru AI

Use requests as you need them
  • Generate calculations
  • QC existing work
  • Code lookups
  • Migration projects
4

Add More When Needed

Purchase additional packs anytime
  • No subscription to manage
  • Credits stack and never expire
  • Volume discounts apply

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Ideal Use Cases

  • Occasional User
  • Supplementing Pro
  • Testing Before Committing
  • Project-Based Work
Profile:
  • Solo engineer or small projects
  • Use Stru AI 5-10 times per month
  • Variable workload
Recommended: Start with 100-request pack ($100)Example: Use 5 requests per month = 20 months of use

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Comparison: Pay as You Go vs Pro

FeaturePay as You GoPro Plan
Base Cost0/month</td><td>0/month</td> <td>500/month
Request Cost0.80−0.80-1.00 per request$1.00 per request (500 included)
ExpirationNeverMonthly quota resets
Private Knowledge Base❌ No✅ Yes (100 documents)
Team Sharing❌ Individual only✅ Unlimited seats
Beta Modules❌ No (RISA, SAP2000)✅ Yes
Usage DashboardBasicAdvanced analytics
SupportEmail (24hr)Email (24hr)
Best ForOccasional use, testing, variable workloadRegular use, teams, production work

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Frequently Asked Questions

No! Pay-as-you-go request credits never expire. Buy once, use whenever you need - even years later.This is different from Pro plan’s monthly quota, which resets each billing cycle.
Yes! Upgrade to Pro anytime:
  • Keep all your existing pay-as-you-go credits
  • They’ll be used after your monthly quota is exhausted
  • No credits are lost in the transition
Example: You have 200 pay-as-you-go credits. Upgrade to Pro ($500/month, 500 requests). Use 600 requests in month 1:
  • First 500 from Pro monthly quota
  • Next 100 from your pay-as-you-go credits
  • 100 pay-as-you-go credits remain for next month
No. Pay-as-you-go is for individual use only.For team collaboration:
  • Upgrade to Pro plan (unlimited seats)
  • Each team member can have their own pay-as-you-go account (not recommended)
Why Pro is better for teams:
  • Shared request pool
  • Shared Private Knowledge Base
  • Better per-person pricing
  • Centralized billing
Yes. Minimum purchase is 100 requests for $100.We don’t offer smaller packs because:
  • Payment processing fees make smaller packs uneconomical
  • 100 requests gives meaningful evaluation period
  • Most users need at least 50-100 requests to see value
Pro tip: 100 requests is enough for:
  • 20-30 simple calculations
  • 10-15 complex calculations
  • 5-10 QC reviews
Yes, within 30 days if unused.Refund policy:
  • Full refund if you haven’t used any requests
  • No refunds for partially used packs
  • Must request within 30 days of purchase
Email bhosh@stru.ai with your refund request.
When your request credits are exhausted:
  1. Agent notifies you that requests are depleted
  2. Work is paused (not lost)
  3. Purchase additional pack instantly
  4. Resume work immediately
No surprise charges - you control when to purchase more.
No. Private Knowledge Base requires Pro or Enterprise plan.This is because:
  • Knowledge base requires ongoing cloud storage costs
  • Document processing infrastructure
  • Continuous indexing and maintenance
Pay-as-you-go is request-only with no monthly infrastructure costs.

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Ready to Get Started?

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Or Upgrade to Pro

Need more features? Consider the Pro plan:

Pro Plan - $500/month

Includes 500 requests + team features
  • Unlimited team seats
  • Private Knowledge Base (100 documents)
  • Beta access to RISA 3D & SAP2000
  • Advanced usage analytics
  • Better value at $1/request with monthly quota
Learn More →

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Need Help Choosing?

Not sure if pay-as-you-go is right for you?
1

Estimate Monthly Usage

How many calculations or code lookups will you do per month?
  • < 50 requests/month: Pay as you go is cheaper
  • 50-100 requests/month: Either option works
  • > 100 requests/month: Pro plan is better value
2

Consider Team Needs

  • Solo engineer: Pay as you go works great
  • Team of 2+: Pro plan offers better value and collaboration
3

Evaluate Features

  • Need Private Knowledge Base? → Pro required
  • Want beta modules (RISA, SAP2000)? → Pro required
  • Just need calculations? → Pay as you go is fine
4

Start Small, Scale Up

When in doubt:
  1. Buy 100-request pack ($100) to test
  2. Track your usage
  3. Upgrade to Pro if you use >100 requests/month
Questions? Email bhosh@stru.ai or schedule a call to discuss your needs.