Name: Ratio iDive Free
Brand: Ratio
Rating: 2.2 (1 reviews)

Ratio iDive Free

A freediving-focused watch computer with Taravana and hemoptysis-risk guidance, plus basic scuba mode.

Cable sync only (libdivecomputer)

Third-party apps can read it, but only over a USB/serial cable, not wirelessly.

2.2Comparison Score

Released	—
Max depth rating	220m
Algorithm	Bühlmann ZHL-16B (scuba mode)
Air integration	none
Wireless	—
Display	80x80 pixel matrix display, sapphire crystal
Battery	rechargeable
Digital compass	Yes
Gas types	air, nitrox
Gas switches	1
CCR capable	No

"Gas switches" is how many different mixes this computer can be programmed to switch between mid-dive, mostly relevant for technical/staged-decompression diving. It doesn't tell you which gas types (air, nitrox, trimix) are supported. See Gas types and the product description above for that.

Pros

Monitors recovery time between freedive runs to help manage Taravana risk
Guides progressively deeper repeat dives to reduce hemoptysis risk in a session
Corrosion-resistant 316L stainless steel case, 3D compass, barometer, and weather forecast

Cons

Freediving-first design, basic single-gas scuba mode only, no multi-gas support
No single authoritative USD price found, a single Amazon listing (as SalviMar iDive Free) showed ~$567 but was out of stock, no confirmed official US price
Smaller support network in North America than major dive-computer brands

Diver community sentiment

Mixed opinions

Divers on freediving-focused forums acknowledge the iDive Free packs an unusually sophisticated feature set for the price, including dual freediving/scuba capability, a Taravana surface-interval algorithm, a machined stainless steel case with sapphire crystal, and a USB-rechargeable battery, but usability complaints recur. Multiple posters describe the menu and button navigation as clunky or "prototype-like," and ask for softer, glove-friendly buttons. On Scubaboard, a more experienced freediver questioned whether Ratio's algorithm has solid scientific backing and said most serious deep freedivers they know default to Suunto instead, though another called it one of the more advanced computers on the market for combining scuba and freediving modes.

Scubaboard: Best Freedive computers discussion DeeperBlue: iDive Free launch thread DeeperBlue: Best Freediving Computer, 2017 update

Summarized from public forum discussion (Scubaboard, Reddit, and similar), not a survey we ran ourselves. See the linked threads for the original conversations.

The iDive Free is Ratio’s freediving-first entry in the iDive watch line, built around Taravana and hemoptysis-risk monitoring between dive runs, with a basic air/single-nitrox scuba mode included.