the spike blog
Guides, honest comparisons, and glucose science for people who wear a CGM and want answers, not just a line chart.
The best CGM apps in 2026
spike, Levels, Nutrisense, Signos, January AI, and the sensor makers' own apps, compared honestly on price and what you actually learn.
GuideWhat app should you use with Dexcom Stelo?
Every app that works with Stelo, how the Apple Health sync behaves, and which pairing turns two weeks of wear into real answers.
GuideIs a CGM worth it without diabetes?
What healthy people actually learn in two weeks, what the skeptics get right, and how to run the whole experiment for around $120.
Buying guideStelo vs Lingo vs Libre: which CGM to buy?
The over-the-counter sensors compared on wear time, cost, app philosophy, and Apple Health support.
ScienceHow to lower glucose spikes: 9 tactics that work
Meal order, carb pairing, post-meal walks, and six more evidence-backed tactics, plus how to verify each one on your own sensor.
ScienceUnderstanding your glucose curve
Baseline, peak, rise, and recovery: the four readable parts of every meal response, and what healthy curves look like.
ExplainerWhy Stelo data is 3 hours behind in Apple Health
The delay is deliberate. Here's why Dexcom built it that way, how to tell it apart from real sync problems, and why meal analysis doesn't care.
Comparisonspike vs Levels
A small BYO-CGM subscription with per-meal curves vs an annual membership with metabolic scores. Which model fits you?
Comparisonspike vs Nutrisense
Do you need a several-hundred-dollar monthly program, or just your own sensor plus the analysis layer? When each answer is right.
Comparisonspike vs Signos
Glucose-guided weight-loss program vs per-meal understanding from the sensor you already own.