Keto App Comparison

Keto Kit vs Zero Fasting

Zero (often called Zero Fasting) is one of the most popular dedicated intermittent fasting trackers, with a strong fasting-first design and biometric integration on Premium. Keto Kit is a keto-first app that bundles macro tracking with a built-in 5-stage fasting timer, a daily Keto Score, recipes, and a Premium AI coach. The two apps overlap on fasting; the question is whether you want fasting alone, or fasting integrated with keto macro context.

Bottom line

Zero is excellent if all you need is a fasting tracker and you don't track macros separately. Keto Kit pairs fasting with macro tracking and a daily Keto Score in one app — its free fasting timer covers 5 metabolic stages, and integrating fasting with keto macros inside the same UI eliminates the need for two apps. If you do both keto and intermittent fasting (most keto users do), Keto Kit removes that friction.

Last reviewed: April 2026

Choose Keto Kit if…

Choose Keto Kit if you do both keto and intermittent fasting and want them in the same app — fasting state and macro state inform each other on the dashboard. The free tier includes 5-stage fasting and the Keto Score; Premium ($5.99/month) adds AI features and the Keto AI Coach.

Choose Zero Fasting if…

Choose Zero Fasting if you only do intermittent fasting, don't track macros separately, want best-in-class biometric tracking on Premium, or value Zero's dedicated fasting brand and content.

Pricing & free-tier coverage

What you actually get for free, what costs extra, and how aggressively each app pushes you toward a paid tier.

Keto Kit

Recommended
Free tier
Manual food search, barcode scanning against the 500,000+ database, fasting timer with 5 metabolic stages, the daily 0–100 Keto Score, gamification, restaurant guide, and basic recipe access. No credit card required.
Paid tier
AI Photo Scan, Voice Food Logging, Keto AI Coach, full recipe library access, AI Shopping Lists, Batch Barcode Scanner, AI Meal Planning, advanced analytics, ad-free experience.
Price
$5.99/month or $49.99/year (annual saves ~30%)
Paywall posture
Premium adds AI conveniences; the keto-specific tracking core (Score, fasting, gamification) stays free

Zero Fasting

Free tier
Basic fasting timer, fasting journal, fasting history, simple charts. Includes ads.
Paid tier
Multi-day fast plans, biometric tracking (heart rate, mood, sleep), advanced analytics, custom protocols, premium content.
Price
Approximately $9.99/month or $69.99/year (US App Store; varies by region)
Paywall posture
Free tier handles basic fasting; Premium adds biometrics and advanced plans

Pricing reviewed April 2026; verify in-app for current rates as both apps adjust pricing periodically.

Side-by-side: Keto Kit vs Zero Fasting

A feature-by-feature comparison of how Keto Kit and Zero Fasting stack up for ketogenic dieters.

FeatureKeto KitZero Fasting
Macro / nutrition trackingYes — full macros (carbs, protein, fat, calories)No
Intermittent fasting timerYes — 5 metabolic stages, free tierYes — core competency, multi-stage tracking
Daily Keto Score (0–100)YesNo
Net carb trackingYes — included freeNo
Recipe library1,000+ keto-only recipesNo
AI photo food recognitionYes (Premium)No
Voice meal loggingYes (Premium)No
AI coach for diet questionsYes — keto-trained (Premium)No
Biometric tracking depthApple Health, Google Fit basicsStrong — heart rate, mood, sleep on Premium
Multi-day fast plansCustom windows; up to 7-day fasts trackable manuallyYes — guided multi-day plans on Premium
GamificationYes — XP, quests, streaks (free)Limited — fasting streaks
Premium price$5.99/month or $49.99/yearApproximately $9.99/month or $69.99/year

Source: Keto Kit team analysis, April 2026. Competitor feature sets change frequently — see each app's website for the latest.

How they compare, category by category

Going beyond the feature-checklist view — the substantive differences in how each app handles the things keto dieters actually use day-to-day.

01

Fasting depth

Keto Kit

Keto Kit's fasting timer tracks five metabolic stages (Fed, Transition, Fat Burn, Ketosis, Autophagy) with presets for 12:12 through OMAD plus custom windows. Excellent for typical 12–24h daily fasts and integrates with macro state on the dashboard.

Zero Fasting

Zero's specialty is fasting itself. Premium adds advanced multi-day fasting plans and protocols beyond what Keto Kit offers natively. For users running extended fasts (48h+, regular multi-day), Zero's depth is a real advantage.

02

Macro and keto tracking

Keto Kit

Full macro tracking (net carbs, protein, fat, calories) plus a daily Keto Score combining adherence factors. The free tier covers most users' daily keto needs.

Zero Fasting

Zero doesn't track macros at all. Users who want both fasting and keto tracking need a second app — typically MyFitnessPal, Lose It!, or a dedicated keto tracker.

03

Biometric integration

Keto Kit

Apple Health and Google Fit sync for weight, steps, and exercise. Biometric depth is more limited than Zero's Premium tier.

Zero Fasting

Zero Premium has stronger biometric tracking — heart rate, mood, sleep, and other markers are integrated into the fasting view. For users prioritizing biometric correlation with fasting, Zero Premium remains a real differentiator.

04

One app vs two

Keto Kit

For users doing both keto and fasting, Keto Kit eliminates the friction of two apps. Fasting state, macros, ketosis estimates, and the Keto Score all live on the same dashboard.

Zero Fasting

Zero pairs naturally with a separate macro tracker. Some users prefer this — best-in-class fasting from a dedicated app, plus a separate tracker for nutrition. The trade-off is double-logging and no integration between fasting and macro data.

Pros & cons

Where each app shines and where it falls short — straightforward, no marketing spin.

Keto Kit

Pros

  • Keto + fasting in one app — no double-logging
  • Daily Keto Score combines fasting and macros into one signal
  • 5-stage metabolic fasting timer included free
  • Full macro tracking on the free tier
  • 1,000+ keto-only recipes
  • Keto-trained AI coach (Premium)
  • Lower paid price ($49.99/yr vs $69.99/yr Zero Premium)

Cons

  • Less fasting-specific depth than Zero on advanced multi-day protocols
  • Fewer biometric integrations than Zero Premium
  • No founder-led fasting research content

Zero Fasting

Pros

  • Best-in-class dedicated fasting product
  • Strong biometric tracking on Premium
  • Established brand with research-leaning content
  • Advanced multi-day fasting plans
  • Large active fasting community

Cons

  • No macro or nutrition tracking at any tier
  • No keto-specific scoring or signal
  • Requires a second app for nutrition tracking
  • More expensive Premium ($69.99/year vs $49.99/year Keto Kit Premium)
Migration tips

Switching from Zero Fasting to Keto Kit

A practical checklist for moving your data, habits, and baseline tracking over without losing momentum.

  1. 1

    Set up your usual fasting protocol in Keto Kit (16:8 default; custom windows available).

  2. 2

    Note your typical fast window from Zero's history and replicate it in Keto Kit.

  3. 3

    If you used Zero's biometric features, decide whether to keep Zero alongside Keto Kit (biometrics) or rely on Keto Kit's Apple Health sync alone.

  4. 4

    Add your keto macro targets in Keto Kit if you weren't tracking macros in Zero.

  5. 5

    Run both apps for a few days if you want to verify your fasting log carries over correctly.

Frequently asked questions

Common questions about choosing between Keto Kit and Zero Fasting.

Is Zero a good app for keto?

Zero is a fasting tracker, not a keto tracker — it doesn't track macros, net carbs, or ketosis adherence. Many keto users pair Zero with a separate macro tracker. Keto Kit combines both in one app, which is usually less friction for keto + fasting users.

Can I do intermittent fasting in Keto Kit?

Yes. Keto Kit's free tier includes a 5-stage fasting timer (Fed, Transition, Fat Burn, Ketosis, Autophagy) with presets for 12:12, 16:8, 18:6, 20:4, OMAD, plus custom windows. Fasting state is visible on the dashboard alongside macros.

Does Keto Kit track metabolic stages like Zero?

Yes — Keto Kit tracks five metabolic stages (Fed, Transition, Fat Burn, Ketosis, Autophagy). Zero's stage tracking is similar in intent. For typical daily fasts (12–24h), the depth is comparable. For extended multi-day fasts, Zero Premium has more advanced guided protocols.

Should I use both Zero and Keto Kit?

Most users find one app sufficient once they consolidate. If you specifically want Zero's biometric integration on Premium or its multi-day protocol library, running both can make sense. For typical 16:8 daily fasting plus keto, Keto Kit alone covers it.

Is Zero Premium worth it if I'm on keto?

Zero Premium (~$69.99/year) is worth it if you specifically want advanced biometric tracking and multi-day fast plans. For keto + standard intermittent fasting, Keto Kit Premium ($49.99/year) covers the same fasting needs plus full keto tracking — better per-dollar value for typical keto users.

Which has better fasting analytics?

Zero's analytics are more fasting-focused (streaks, longest fasts, biometric correlation on Premium). Keto Kit's analytics integrate fasting with macros and the Keto Score, which is more useful if you care about how fasting affects your keto adherence specifically. Different lenses on the same data.

The verdict

Zero Fasting is excellent at fasting alone — its Premium tier remains one of the strongest dedicated fasting products on the market. Keto Kit's value is integration: fasting + macros + Keto Score in one app, with the free tier covering 5-stage fasting at no cost. For users doing keto + intermittent fasting (the typical keto user), Keto Kit removes the need to keep two apps in sync. For users doing only intermittent fasting without keto, Zero remains the better-fit specialist tool.

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