Fasting App Pricing & Subscription Plans

FAQ

What is the SPARK chart and how does it track my fasting progress?

The SPARK chart is SparkFast's signature progress tracker that visualizes the cellular benefits happening inside your body in real time as you fast. SPARK stands for the five metabolic stages you progress through: Stem Cells (cellular regeneration), Peak HGH (human growth hormone surge), Autophagy (cellular cleanup and renewal), Reduced Insulin (improved insulin sensitivity), and Ketogenesis (fat burning mode). No other fasting app shows you exactly when these science-backed benefits activate during your fast.

How does SparkFast motivate me?

SparkFast keeps you motivated through real-time SPARK phase tracking, fasting milestone notifications, achievement badges from Bronze to Diamond rarity, structured challenges across beginner to advanced levels, and personalized motivational messages based on your progress. The app celebrates every milestone — from your first 24-hour fast to your thousandth fasting hour.

Does SparkFast support prolonged fasting (36h, 48h, 72h, 96h)?

Yes, SparkFast fully supports prolonged fasting with built-in protocols including The Autophagy Spark (36h), Peak Repair (48h), The Regenerator (72h), and Sustained Renewal (96h). Each prolonged fast includes a guided refeed protocol so you know exactly what to eat and when to safely break your fast. You can also create custom fasts of any duration.

Will this app work for Intermittent Fasting (16:8)?

Yes, SparkFast supports all popular intermittent fasting schedules including 12:12, 16:8, 18:6, 20:4, and 23:1 (OMAD). You can also create a custom intermittent fasting schedule with your own eating window times. The app sends eating window notifications to help you stay on track — one hour before your window opens, when it opens, and one hour before it closes.

How is the Refeed Protocol different from other apps?

SparkFast is the only fasting app that includes structured, step-by-step refeed protocols tailored to your fast duration. After completing a prolonged fast, the app guides you through exactly what to eat and when, helping you avoid digestive discomfort and safely reintroduce food. You can use the default protocols or customize them to match your dietary preferences.

Can I track glucose, ketones, and GKI with SparkFast?

Yes, SparkFast tracks blood glucose, blood ketones, GKI (Glucose Ketone Index), and the Dr. Boz Ratio — all in one app. Log readings manually or sync automatically from Apple Health, Google Fit, or your Keto-Mojo meter. SparkFast pairs your glucose and ketone readings to calculate your metabolic ratio in real time, showing you exactly how deep into ketosis and fat-burning your fast has taken you.

What data does the app sync from Apple Health?

SparkFast syncs weight, blood glucose readings, blood ketone readings, and sleep data (duration, light, deep, and REM stages) from Apple Health on iOS. On Android, the app syncs the same data types through Google Fit via Health Connect. SparkFast also integrates directly with Keto-Mojo meters for automatic glucose and ketone reading sync.

Is there a free trial? How does the pricing work?

SparkFast offers a 7-day free trial so you can explore all features before committing. After the trial, you can continue with a monthly or yearly subscription plan. You can also apply a promo code during signup for special access.

What happens to my data if I delete the app?

Your fasting history, health readings, achievements, and preferences are securely stored in your account on our servers. If you delete the app and reinstall it later, simply sign in with your original account and all your data will be restored. If you want to permanently delete your data, you can do so from your profile settings.

Stop Guessing.Start Fasting with Confidence Today.

FAQ