Simple, Transparent Pricing
All calculators are free forever. Upgrade for a better experience and extra power.
Free
Everything you need to get started with RF engineering calculations.
- ✓All 232 calculators
- ✓Educational content
- ✓Shareable URLs
- ✓Embeddable widgets
- ✓Mobile + offline (PWA)
- ✓API access — 5 calls/month
- ✓1 API key
Pro
For engineers who want a distraction-free experience and cloud sync.
- ✓Everything in Free
- ✓No advertisements
- ✓Save calculations to cloud
- ✓Export results as CSV
- ✓Priority support
- ✓New calculators first
- ✓API access — 100 calls/month
- ✓3 API keys
Subscribing accepts our Terms of Use and Privacy Policy. Billing is handled by Lemon Squeezy as merchant of record.
API
Integrate RF calculations directly into your own apps and workflows.
- ✓Everything in Pro
- ✓10,000 API calls/month
- ✓5 API keys
- ✓Batch endpoint (up to 50 calculations)
- ✓OpenAPI / Swagger docs
- ✓API key management dashboard
- ✓Usage analytics
Subscribing accepts our Terms of Use and Privacy Policy. Billing is handled by Lemon Squeezy as merchant of record.
Frequently Asked Questions
Can I cancel anytime?
Yes, cancel from your Lemon Squeezy dashboard — no questions asked. Your Pro access continues until the end of the billing period.
What payment methods are accepted?
Lemon Squeezy accepts all major credit/debit cards, PayPal, and regional payment methods. No account registration required to purchase.
Is there a free trial?
There's no time-limited trial, but the Free tier gives you full access to all calculators. Upgrade to Pro when you need the additional features.
How does the API work?
Every signed-in user gets API access — Free (5 calls/mo), Pro (100 calls/mo), and API (10,000 calls/mo). POST to https://rftools.io/api/py/v1/calculate with your API key in the X-API-Key header. Quotas reset on the 1st of each month. Full documentation is available in your dashboard.
What happens to my API keys if I downgrade?
Your keys stay active — only the monthly quota adjusts to your new plan. No surprise revocations.
Do you offer team or site licenses?
Contact us at api@rftools.io for volume pricing on API access.
Payments are processed securely by Lemon Squeezy. Questions? Email api@rftools.io