CCR Mixer

Sudo Ezekiel

About this app

CCR Mixer is a gas blending and dive planning calculator for closed-circuit
rebreather (CCR) and open-circuit mixed-gas diving. It runs entirely on your
device, with no account, no ads, and no tracking.

CALCULATORS

- Optimal CCR mix: the best diluent for a target depth and PO2 setpoint.
- Gas blending: nitrox, trimix, heliair, topping up a partially filled tank,
and what-if checks before you open a valve.
- Depth limits: MOD, END, EAD and EADD for any mix, in salt or fresh water.
- Oxygen exposure: CNS percentage and OTU.

OTHER FEATURES

- Save and recall your mixes, with each one's MOD shown at a glance.
- Metric or imperial units (m and bar, or ft and psi).
- Salt or fresh water pressure model.
- Set your own default PO2 setpoint and maximum PO2.
- A validation screen that runs the calculator against published reference
values (NOAA, TDI/SDI, and open-source dive tools) so you can confirm the
maths against sources yourself.
- Works fully offline.

SAFETY

CCR Mixer is a planning aid for trained, certified mixed-gas and rebreather
divers. Mixing or planning errors can be fatal. Always analyse your final mix
with a calibrated analyser before diving, and follow your training and your
equipment manufacturer's guidance. This app is an information aid, not a
medical device, and it does not replace proper training, your tables, or your
own checks.

What’s new

New in 0.2.0:

• Top-up rescue: when a target mix cannot be reached by adding gas, the app now computes the minimum drain (bleed down to X bar, then fill) instead of only reporting it as impossible.

• High-pressure trimix plans now warn that the finished mix can read a few percent low on helium versus the ideal-gas numbers.

• New first-launch safety notice, plus Terms of Use and Privacy Policy in Settings.

Always verify every mix with a calibrated analyser before diving.