Biosense Breath Ketone Monitor Review: No More Finger Pricks

Biosense is the most accurate consumer breath ketone meter. Here’s the full review.

For glucose CGM tracking, see: Best CGM for Non-Diabetics.

Quick Specs

Specification	Biosense
Price	$299
Consumables	None
Measures	Breath acetone
Scale	ACEs (0-40)
App	Yes (free)

How It Works

1. Turn on device
2. Follow breathing prompts (deep breath sequence)
3. Exhale into mouthpiece
4. Get ACE reading in seconds
5. Sync to app

ACE = Acetone Equivalent. Higher = deeper ketosis.

ACE Level	Ketosis State
0-2	Not in ketosis
3-8	Light ketosis
9-20	Optimal ketosis
20+	Deep ketosis

Accuracy Discussion

Biosense has correlation with blood BHB, but it’s not identical:

• Studies show ~0.85 correlation coefficient
• Best for tracking trends over time
• Less precise for absolute values

Good for: Confirming ketosis, tracking patterns, motivation.

Not good for: Clinical precision, therapeutic ketosis protocols.

Biosense vs Keto-Mojo

Feature	Biosense	Keto-Mojo
Method	Breath (no pricks)	Blood (finger prick)
Upfront cost	$299	$50
Ongoing cost	$0	$1/test
Accuracy	Good (indirect)	Gold standard
Convenience	High	Moderate

Break-Even Analysis

At $1/strip, Biosense breaks even at 299 tests (~10 months at 1/day).

If you test 2x/day, break-even is ~5 months. After that, Biosense is “free.”

Who Should Buy Biosense

• ✅ Hate finger pricks
• ✅ Plan to test frequently
• ✅ Want trend tracking over time
• ✅ Comfortable with directional (not absolute) data

Who Should Choose Keto-Mojo

• ❌ Need clinical precision
• ❌ Test infrequently (cheaper with strips)
• ❌ Want exact BHB values

Verdict

Biosense is the best breath ketone monitor. No pricks, no ongoing costs, and accurate enough for
tracking patterns.

The $299 upfront pays off quickly if you test regularly. For occasional testing, Keto-Mojo is more economical.

For glucose CGM tracking, see: Best CGM for Non-Diabetics.