Saved plans and repetitive dives. Build a dive, keep it under a name, and reuse it. Then say that up to three saved dives came before the one you are planning, each with the surface interval before it. Every earlier dive is re-solved in full — descent, time at depth, every stop and the last six metres — and off-gassed through the interval on air, nitrogen and helium both. No published table covers repetitive decompression dives; this is the model run forward, and the app says so. A wider envelope. 15 m to 56 m. 51 m is still the stated limit and the app says so past it — deeper than that the binding constraint is gas density, not oxygen. Six bottom gases: EAN32, triox 30/30, EAN28, air, 21/35 and 18/45. And the deco bottle is yours to choose — AL80, AL50 or AL40. Which one fits depends on the deco gas rather than the depth: oxygen is breathed only from 6 m, so the same bottle buys about twice the bottom time. Pragmatic decompression, off by default. Linearises the stops between 21 m and 9 m the way the course material teaches, then re-solves the last stop from the modified tissue state. It is a simpler profile to fly, not a safer one, and the app does not claim otherwise. A plan screen with one control per number. Depth, bottom time and both cylinder fills are sliders with the standard values as ticks you can tap. The bottom gas is six chips, all of them on screen. The fill control says what it will do rather than asking you to work out a checkbox, and imperial divers get feet on the depth slider instead of converted metres. Also: bottom time is minutes at maximum depth, with the descent as its own named leg. The oxygen clock counts the last six metres and carries forward between dives at a 90-minute half-time. The longest bottom time offered is worked out from your gas, cylinders and settings rather than a flat hour. And on a long oxygen run, a line says when a break on back gas is due.