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🎉 Early Bird launch promo · Get 30% off year 1 on annual plans with code EARLYBIRD30 · ends 31 Dec 2026
PRICING

Plans that scale
with your projects

Start free. Upgrade when you're ready. Cancel anytime — no hidden fees, no commitments. All plans include real-time calculation, EN/TH/ZH/HI interface, and global payment support.

All prices in Thai Baht (THB), VAT 7% included · Pay by Visa, Mastercard, JCB or PromptPay via Xendit

Free
Students & explorers
฿0
forever
  • 1 active project
  • Up to 3 floors / 5 rooms
  • Real-time BTU/OTTV slider
  • Multilingual UI (EN/TH/ZH/HI)
  • No PDF export
  • No save/load
  • No baseline comparison
Start Free
Starter
Solo architects · Student Pro
$19$16 ฿690฿575/mo
billed monthly$192/yr · billed yearly billed monthly฿6,900/yr · 2 months free
  • Up to 5 floors / 20 rooms
  • Save / Load 10 projects
  • Watermarked PDF export
  • Baseline comparison
  • Carbon impact report
  • Email support
  • No custom branding
Start 14-day Free Trial or buy now — pay with card / PromptPay →
⭐ Most Popular
Pro
Working professionals
$49$42 ฿1,790฿1,492/mo
billed monthly$499/yr · billed yearly billed monthly฿17,900/yr · 2 months free
  • Unlimited floors / rooms / projects
  • Custom-logo PDF export
  • Layered R-Value Calculator
  • Break-even & ROI analysis
  • Multi-direction façade optimizer
  • Priority support 24h
  • API access (read-only)
Start 14-day Free Trial or buy now — pay with card / PromptPay →
Studio
Architecture / Engineering firms
$199$169 ฿7,190฿5,992/mo
5 seats · billed monthly$1,990/yr · 5 seats · 2 months free 5 seats · billed monthly฿71,900/yr · 5 seats · 2 months free
  • Everything in Pro
  • 5 user seats (more seats on request)
  • Team project sharing
  • Firm-branded PDF reports
  • Material catalog (B2B)
  • Slack/Teams onboarding
  • Quarterly review session
Book a Demo or buy now — pay with card / PromptPay →

Enterprise / White-label / API

For developers, governments, certification bodies, and large firms. Custom climate database, SSO/SAML, dedicated success manager, 99.9% SLA.

Contact Sales Starting at $5,000/year฿180,000/year
Compare Plans

Every feature, every plan

FeatureFreeStarterProStudioEnterprise
Projects110 savedUnlimitedUnlimitedUnlimited
Floors / Rooms3 / 55 / 20UnlimitedUnlimitedUnlimited
Real-time BTU/OTTV Slider✓✓✓✓✓
Save / Load—✓✓✓✓
PDF Export—WatermarkedCustom LogoFirm BrandWhite-label
Baseline vs. Optimized—✓✓✓✓
Layered R-Value Calculator——✓✓✓
Break-even / ROI Panel——✓✓✓
Multi-direction Optimizer——✓✓✓
Carbon Impact Report—✓✓✓✓
Team Seats1115 (more on request)Custom
API Access——Read-onlyRead/WriteFull + SSO
Material Catalog (B2B)———✓✓
Custom Climate DB————✓
SupportCommunityEmail 48hPriority 24hSlack/TeamsDedicated
SLA———99.5%99.9%
Pricing FAQ

Common questions, straight answers

Can I switch plans anytime?
Yes. To upgrade, buy the new plan — it starts immediately from the payment date. To move to a smaller plan, choose it when you renew.
What happens after the 14-day trial?
Nothing automatic. No payment details are collected during the trial. We email you 3 days and 1 day before it ends; if you don't buy a plan, your account moves to the Free plan — no charges, no surprises.
Do you offer educational discounts?
Yes. Verified university students and faculty get our Educational Lifetime Free plan with full Pro features. Email hello@zerooptimize.com with your .edu/.ac.th email.
Do you offer refunds?
Yes. 14-day money-back guarantee on first-time monthly subscriptions, and 30-day for annual plans. See full refund policy.
Can I pay annually for a discount?
Yes — pay yearly and get 2 months free (12 months for the price of 10). Toggle the switch at the top of the page to see annual prices.
What currencies do you support?
Thai Baht (THB) only. Prices are shown and charged in THB with VAT 7% included, and payments are processed by Xendit (PCI-DSS Level 1) by Visa, Mastercard, JCB or PromptPay. If your card is in another currency, your bank may apply its own conversion fee.