At the fill panel
The cylinder has been analysed. The Gas Analyzer shows ppO₂, MOD, END and density – and whether the gas suits the planned profile.
All solutions
Apps & Community
Kraken Tools
The digital toolbox for divers.
Dive planning, gas calculation, decompression, safety and CCR tools, logbook, map and colour correction for underwater images.
Store listings linked
Who it's for
Ambitious recreational and technical divers
Diving deeper, longer or with several gases means a lot of maths: MOD, gas requirements, deco stops, turn pressure. These calculations are often scattered across tables, websites and notes. Kraken Tools brings them together in one app – each with use case, formula note and practical tip.
What Kraken Tools takes off your hands.
- 01
Plan decompression
Decompression plans based on Bühlmann ZH-L16C with gradient factors, lost-gas scenarios and side-by-side GF comparison.
- 02
Understand and blend gases
Analyse nitrox and trimix, back-calculate the right mix, check gas density and get the correct fill sequence at the panel.
- 03
Safety before the dive
Determine your personal consumption, set minimum gas and turn pressure, track oxygen exposure over several days.
- 04
Planning at the dive site
Quick planning for recreational divers, best- and worst-case scenarios compared and compact wetnotes for your slate.
- 05
Logbook, map and images
Log dives, pin dive sites on the map and correct colour casts in underwater photos and videos.
All tools
The complete toolbox.
Decompression
Plans, failure scenarios and comparisons for decompression dives.
- Decompression planner
- Decompression plan based on Bühlmann ZH-L16C with configurable gradient factors. Multi-level and multi-gas profiles with stop table, gas use per stop, CNS/OTU tracking and depth profile chart.
- Bühlmann ZH-L16C · GF · CNS/OTU
- Lost Gas Planner
- Simulates losing a deco gas and calculates an alternative ascent profile with the remaining gases.
- Contingency · Deco gas loss
- GF Compare
- Compares up to three GF settings on an identical dive profile – as a table and overlaid depth profile.
- GF low/high · Comparison
Gas calculation
From nitrox to trimix: analyse, back-calculate, blend and check.
- Nitrox planner
- Nitrox analysis for any O₂ fraction from EAN21 to EAN100: ppO₂, MOD, EAD and best-mix suggestions.
- ppO₂ · MOD · EAD
- Trimix calculator
- Trimix analysis (O₂/He/N₂) with MOD, ppO₂, EAD, END and gas density.
- END · He · MOD
- Best Mix
- Back-calculates the right O₂/He mix from target depth, ppO₂ limit and desired END.
- Optimal mix
- Gas Analyzer
- Overall assessment of a mix: ppO₂ traffic light, MOD, END, density and CNS rate – with reasoning whether it fits the profile.
- Gas analysis · Assessment
- Gas blender
- Partial-pressure blending and top-up with fill sequence and intermediate pressure for each step.
- PP blending · Fill panel
- Gas Switch / MOD check
- Gas switch planner with MOD validation: sorts available gases by switch depth and flags danger zones.
- Gas switch · MOD
- Stage Planner
- Cylinder and stage configuration with usable volume and range at a given SAC rate.
- Cylinders · Stages
- Gas Density
- Gas density in g/l for any mix and depth, with a traffic light based on common recommendations.
- Density · Work of breathing
- EAD / EADD
- Equivalent air depth and equivalent air decompression depth of a nitrox mix.
- EAD · Nitrox
- END calculator
- Equivalent narcotic depth of a trimix, with or without helium counted as narcotic.
- END · Narcosis
- ENP calculator
- Compares a trimix's nitrogen partial pressure with air at an equivalent depth.
- ENP · pN₂
Safety
Set reserves, turn points and oxygen exposure before the dive.
- SAC / RMV calculator
- Determines your personal surface and respiratory minute volume from pressure used, depth and time.
- SAC · RMV
- Rock Bottom / Minimum Gas
- Calculates the reserve that gets two divers to the surface together – including problem solving, ascent and safety stop.
- Reserve · Stress
- Turn Pressure
- Turn pressure by rule of thirds, sixths, halves or custom, with remaining pressure after return.
- Turn pressure
- O₂ exposure (CNS)
- CNS oxygen exposure per dive and cumulatively over the day based on the NOAA table.
- CNS · NOAA
- OTU tracking
- Pulmonary oxygen exposure over several days, e.g. on expeditions.
- OTU
- ICD Risk Check
- Checks the isobaric counter-diffusion risk on gas switches and warns about critical transitions.
- ICD · Gas switch
- Lift bag calculator
- Required lift bag size from weight, material density and water type.
- Buoyancy · Recovery
Planning
Quick at the dive site or thorough at the briefing.
- Dive planner
- Quick planner for recreational divers: no-deco limit, nitrox check, MOD, gas requirement and safety stop on one screen.
- NDL · Nitrox
- Scenario planner
- Compares best- and worst-case scenarios side by side – varying depth, bottom time, gases and GF.
- What if
- Wetnotes
- Turns the deco plan into a compact runtime table for your slate.
- Runtime slate
CCR / Rebreather
Tools for rebreather divers.
- Bailout Planner
- Bailout gas planning: open-circuit gas needed to ascend from any depth including deco stops.
- CCR · Bailout
- Scrubber calculator
- Remaining duration of the CO₂ absorbent considering temperature, depth, respiratory minute volume and sorb type.
- Scrubber · CO₂
Logbook, map & media
Document, locate and correct images.
- Logbook
- Digital dive logbook with photos, GPS pin, buddies, depth profile, conditions, notes and tags – including dive computer import.
- Logbook · Import · GPS
- Dive Map
- World map of all logged dive sites; one tap opens the log entry.
- Map
- Projects
- Group related dives – wreck search, cave survey, photo series or liveaboard.
- Grouping
- Diver profile
- Certifications, experience, your own consumption defaults and buddy list.
- Profile
- UW Color Fix (photo)
- Colour correction for underwater photos: restore red, remove blue cast, white balance, zone editing and depth presets.
- Colour correction
- UW Video Color Fix
- The same correction for underwater videos, frame by frame, with audio preserved.
- Video
Comfort & workflow
Small things that save time every day.
- Saved calculations
- Save any calculation with a name and call it up again later.
- Save
- Sharing
- Share calculations, log entries and profiles via common messengers and email.
- Share
- Unit switch
- Global switch between metric and imperial units.
- Metric · Imperial
Important: Kraken Tools supports planning and calculation. Its results replace neither sound dive training nor your own checks nor a dive computer.
Inside the app.
Real screens. Tap to enlarge.
What it looks like in practice.
At the briefing
The team plans a wreck dive. Scenario planner and wetnotes produce a shared plan including reserve and turn point.
Questions about Kraken Tools
More from Apps & Community
All solutions →
AppsFreeBuddySystem PROYour whole operation in one workflow.For Dive schools, dive centres and professional operators See what's insideApps & CommunityBuddySystem PROFreeWhat you getCustomers and courses togetherWho booked which course, who is still missing from the group, which documents are in? Customer data and course planning work hand in hand instead of being maintained twice.Bookings at a glanceEnquiries, confirmed dates and open spots are visible in one place – for the whole team, not just whoever answered the phone.Plan the teamInstructors, guides and helpers can be assigned to days and courses, so staffing gaps show up early.Equipment and fill stationRental gear and fills are part of daily business. They become part of the same workflow rather than a separate list.Learn more 
AppsFreeDiveBuddy PRODiscover and record the world of diving.For Divers – from the first course to the dive trip See what's insideApps & CommunityDiveBuddy PROFreeWhat you getLog your divesRecord what you experienced underwater so it lives on beyond memory – and stays traceable.Discover dive sitesFind new spots and see what others experienced there before you get in the water.Find operatorsDiscover dive schools and centres and get to know their offers.Organise trips and experiencesFrom the first idea to the dive holiday: planning and memories in one place.Learn more 
AppsFreeWaidlotseYour hunt. Your hunting ground. Everything in view.For Hunters, estate leaseholders, hunting teams and people documenting wildlife observations See what's insideApps & CommunityWaidlotseFreeWhat you getGive your estate structureRecord facilities with names, categories and coordinates and find them on the estate map. Everyone refers to the same place.Plan an outing, confirm attendanceReserve a facility and time slot. Check in deliberately on site and end your attendance afterwards. A booking is not a check-in.Keep observations traceableRecord sightings, harvests and found game with species, count, time and notes. Attached private photographs and videos complement the journal.Tasks instead of forgotten arrangementsRecord fieldwork with descriptions and dates, review open tasks and mark completion.Learn more