What's in the offline version
Same scientifically-sourced data as the free calculator (USDA Forest Products Lab, EPA, EIA). Adds the tools you need when you're estimating multiple trees a day, in the field, with no signal.
Works completely offline
Single HTML file. Open it on any phone, tablet, or laptop — even with no signal. Everything runs locally in your browser.
Save unlimited estimates
Keep a history of every tree you've estimated. Named, dated, and stored on your device. Re-open and edit any time.
Side-by-side comparison
Compare two trees (or two estimates) at once. Useful when a customer asks "what about that one too?"
Clean PDF export
One tap exports a printable, client-ready estimate report. Looks professional. No Apical branding — yours or theirs.
White-label ready
No "Powered by Apical" footer. Brand it with your own company name if you're a professional using it for client work.
Lifetime updates
When new species data or fuel prices are released, you'll get a free download link. One purchase covers every future version.
Free vs. offline
| Free (web) | $5 Offline | |
|---|---|---|
| Core calculator (yield, BTU, fuel equivalents, CO₂) | ✓ | ✓ |
| Removal savings estimate | ✓ | ✓ |
| Works offline | After first load only | Always |
| Save estimates for later | — | Unlimited, named |
| Side-by-side comparison mode | — | ✓ |
| Print / PDF export | Basic | Professional report |
| White-label (your brand) | — | ✓ |
| Apical branding | Yes (it's free — helps them grow) | None |
| Lifetime updates | — | ✓ |
| Price | Free | $5 one-time |
Get the offline version — $5
One-time purchase. No account. No subscription. Pay once, use forever.
Buy for $5Secure checkout via Stripe · Instant download · Works on iOS, Android, Mac, Windows, Linux
Frequently asked
How do I get the file after I pay?
After checkout, you'll see a download link on the confirmation page AND get it emailed to you. The file is a single HTML document. Save it to your device, open it in Chrome/Safari/Firefox, and it works forever.
Does it really work without internet?
Yes. Everything (data, math, styles) is in the single HTML file. No external requests, no service worker needed. You can be in the woods with no signal and it still works.
Can I put my own company name on it?
Yes. The offline version has no Apical branding. Edit the file in any text editor to add your company name, logo (as base64), or phone number in the header.
What if I buy it and don't like it?
Email [email protected] within 30 days for a full refund. No questions asked.
Why $5?
Low enough that anyone can afford it, high enough to fund ongoing data updates. Not a subscription — one purchase covers every future version.
About the offline version
The offline version is a static HTML file. It does not phone home, collect analytics, track usage, or send any data anywhere. All estimates are calculated on your device.
Data sources are identical to the free version: USDA Forest Products Laboratory FPL-GTR-190, EPA Greenhouse Gas Equivalencies Calculator, and US Energy Information Administration. See SOURCES.md in the free version.
Refund policy: 30-day money-back guarantee. Email [email protected].