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Subscriptions & Pricing

DiveToolbox uses a freemium model. All tools are accessible to free users with limited quotas, while a Premium lifetime purchase unlocks unlimited access forever.

Free Tools (unlimited)​

The following tools are available to everyone with no limits:

  • Conversions — Convert between metric and imperial units for depth, pressure, volume, and temperature
  • MOD / EAD / END — Calculate Maximum Operating Depth, Equivalent Air Depth, and Equivalent Narcotic Depth
  • Gradient Factors — Visualize and understand gradient factor settings
  • Rock Bottom — Minimum gas reserve calculations
  • Gas Density — Breathing gas density at depth (Anthony 2018 / DAN limits)
  • ICD Calculator — Isobaric counter-diffusion check for gas switches (Doolette 1:5 rule)
  • Weather — Marine conditions and dive forecasts (2 favorite spots for free users)

Free Tools (with quotas)​

These tools are free to use but limited to a set number of calculations per free account:

  • Dive Planner — 5 calculations
  • Gas Blending — 5 calculations
  • Successive Dives — 5 calculations
  • SAC Calculator — Unlimited calculations, 3 saved results

Once a quota is reached, a Premium purchase is required for continued use.

Premium — Lifetime Access​

A one-time Premium purchase removes all quotas and unlocks:

  • Unlimited access to all tools (Dive Planner, Gas Blending, Successive Dives, SAC Calculator)
  • Unlimited SAC history — Save as many SAC calculations as you need
  • Up to 100 favorite dive spots — Save your most visited weather locations
  • Unlimited dive plans — Save and organize as many dive plans as you need

Pricing​

Premium is available as a one-time lifetime purchase — pay once, use forever. No subscription, no recurring fees. Pricing is available in multiple currencies (EUR, USD, GBP, CHF, and more).

You can purchase Premium from the Pricing page, from the pricing cards on the landing page, or from your Account settings if you already have an account.

Mobile purchases

On Android and iOS, Premium is available as a one-time in-app purchase through the respective app store (Google Play or App Store). Your purchase is linked to your DiveToolbox account and works across all platforms.