Technical diving gas partial-pressure blending app. Supports nitrox and - via in-app purchase upgrades - trimix and pricing/volumes used.

Baltic Blender uses the GERG-2004 real gas model to allow a SCUBA gas blender to easily and accurately use partial-pressure techniques to blend available gasses to the desired final mixture. It is not intended as a substitute for proper training and certification in the safety, handling, and blending of high pressure gasses, but rather as a tool to perform the complex math required to reach the desired mixture. In such training classes, you would learn important safety information about the handling of high-pressure gasses. SCUBA gas blending is not to be taken lightly; it is one of the only activities where a mistake may not just kill you, but also those around you, or possibly the diver you are blending the gas for.

Traditional blending techniques have two inherent errors which the blender must learn to compensate for, traditionally by adding a fudge-factor. First, traditional blending uses the simple ideal gas model, but the gasses we breathe, at SCUBA cylinder pressures, are far from ideal gasses. Baltic Blender uses the GERG-2004 real gas model which predicts how the real-world gasses behave. Second, traditional blending generally ignores the heating of the cylinder as gas is introduced, requiring the blender to either fudge or allow the cylinder to cool. Baltic Blender requires that the blender allow the temperature to stabilize, rather than cool, between each step, so that an accurate measurement of the cylinder wall temperature using a commercially available infrared thermometer reflects the temperature of the gas inside.

Supports using preblended gas for eg. using leftover trimix or for using banked mixes.

Features ;
* Nitrox
* Trimix (via in-app purchase)
* Volume consumed & Pricing (via in-app purchase)
* Blending and topping off
* Metric and imperial units.
* Simultaneous work on multiple cylinders
* Grouping of tanks and pricing
* Real Gas Law using GERG-2004
* Per cylinder configurable preblend
* Easy to access temperature adjustments
* Configurable list of default gases
* Configurable standard temperature
* Bill printing/emailing

You can enter the data for multiple cylinders at once. Cylinders can be placed in groups for billing purposes.

** Trimix, volume consumed and pricing is only available via in-app purchase upgrades. **

GERG-2004; Kunz, O.; Klimeck, R.; Wagner, W.; Jaeschke, M. (2007): The GERG-2004 Wide-Range Equation of State for Natural Gases and Other Mixtures: GERG Technical Monograph 15 (2007) and Fortschr.-Ber. VDI, Reihe 6, Nr. 557, VDI Verlag, Düsseldorf, 2007.

The partial GERG-2004 implementation used to calculate the compressibility factors of oxygen, helium, nitrogen and their mixtures in the gas phase was inspired by open source code written by David de Marneffe (daviddemarneffe[at]y a h o o . c o m) in December 2007.

What's New

Version 1.7

Further improvements to mapping adding gas back to volume. Now filling a 80 cuft 3000 psi tank from 0 to 3000 psi with air will show 80 cuft was added and not 79.6 cuft.

Ratings and Reviews

Best blending software for iOS

Kenneth Adelman

This is the best software out there for calculating partial-pressure blending of SCUBA gasses. It uses the GERG real-gas model (the most accurate of the real gas models that exist) combined with a unique approach to the temperature rise that occurs when you add each component gas to allow quick and accurate blending WITHOUT having to wait for the cylinder to cool between gasses.

Handy and accurate


This tool works perfect and the temperature parameter is splendid and works perfectly well. The volume and pricing add-in was a bit tricky, but once I got it working I quickly learned that when diving trimix, a rebreather saves you a lot of money.

Love it!


Gives you speed and accuracy when blending gas. Very accurate when you follow the directions. I use this anytime I teach blending courses now because the students hit the mark every time.


Eskil Olsen
7.1 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2012 Eskil Olsen
In-App Purchases
  1. Trimix $4.99
  2. Volumes & Pricing $4.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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