# SparkFast — Track fasting & biomarkers > Track fasting & biomarkers (iPhone/iPad app by SparkFast Technologies LLC.) - Source: https://appshunter.io/ios/app/sparkfast/id6755233574 (this page in markdown: same URL + `.md`) - Developer: [SparkFast Technologies LLC](https://appshunter.io/developer/1852736867) - Category: Health & Fitness - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 14.0 · 95 MB - Languages: American English - Released: 2026-01-15 - Data updated: 2026-09-17 - User reviews in markdown: https://appshunter.io/ios/app/sparkfast/id6755233574/reviews.md ## What is SparkFast? Most fasting apps count hours. SparkFast shows you what those hours might mean — estimated biological milestones that give you a reason to keep going. THE SPARK CHART Your fasting hours aren't just numbers. The SPARK Chart visualizes five estimated biological processes — from early insulin changes to deep cellular recycling — based on published research. It transforms a blank timer into a roadmap of what you're working toward. GUIDED REFEEDING Breaking a prolonged fast matters as much as the fast itself. SparkFast provides step-by-step refeeding protocols tailored to your fast duration and dietary preference. No more Googling "how to break a 72-hour fast" mid-fast. AI-POWERED PERSONALIZATION Tell SparkFast about your goals, experience, dietary preferences, and schedule. Our AI creates a custom fasting plan built around your life — not a one-size-fits-all template. CHALLENGES THAT BUILD HABITS Built-in challenges — from a beginner-friendly 5-day start to a 72-hour deep fast — give you structure and milestones to work toward. Track progress, earn achievements, and build consistency. BIOMARKER TRACKING (OPTIONAL) For users who track glucose, ketones, GKI, or Dr. Boz Ratio: log readings manually or sync from Keto-Mojo and Apple Health. See how your metabolic data trends alongside your fasting practice. Most users start without this — it's there when you're ready. ALSO INCLUDES - Intermittent and prolonged fasting schedules (16:8, 18:6, OMAD, 36h, 48h, 72h+) - Apple Health integration for weight, sleep, steps, and heart rate - Motivational notifications at key fasting milestones - Eating window and hydration tracking - Stool tracking for gut health awareness - Custom trackers for anything you want to monitor BUILT FROM EXPERIENCE SparkFast was born when co-founder Veronica — who went from a BMI of 32 to a normal BMI through fasting — realized she kept printing charts of estimated biological milestones and sticking them on her kitchen wall to stay motivated during 72-hour fasts. That piece of paper became this app. IMPORTANT The SPARK Chart shows estimated timelines based on published fasting research. Actual metabolic responses vary between individuals based on diet history, metabolic health, and other factors. SparkFast is a motivational and educational tool, not a medical device. YOUR PRIVACY SparkFast does not sell personal data. All information is stored securely and encrypted. SUBSCRIPTION SparkFast requires a subscription for full access. Options include monthly and yearly plans, both with a free trial. Payment is charged to your Apple ID at purchase and renews automatically unless cancelled at least 24 hours before the end of the current period. Manage subscriptions in App Store settings. Terms of Service: https://www.sparkfast.app/terms-of-service Privacy Policy: https://www.sparkfast.app/privacy-policy ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | SparkFast Monthly | $6.99 | per month | | SparkFast Yearly | $64.99 | per year | | SparkFast Annual | $57.00 | per year | | SparkFast Annual | $54.00 | per year | | SparkFast Annual | $48.00 | per year | | SparkFast Annual | $51.00 | per year | ## Version history (last 5 releases) ### 1.0.51(74) — 2026-09-16 • A cleaner dashboard and a redesigned Settings • Your personalised plan, now short and to the point • Refeeding: a live countdown to your next step, with reminders that follow it • Fix a water or electrolyte tap with the new − button • Keto-Mojo syncs on its own; new metabolic charts and steps • Send feedback with a screenshot, or delete your account in Settings • Smoother sign-in and many fixes ### 1.0.49(72) — 2026-09-02 - Clearer, more accurate companion messages and reminders - Small fixes and improvements ### 1.0.48(71) — 2026-08-06 This update keeps SparkFast running smoothly: • Updated security and performance libraries • Clearer messaging when your subscription expires, so you always know your account status • Improved error handling and general stability fixes ### 1.0.47(70) — 2026-04-23 Bug fixes and performance improvements. Fixed an issue where subscription status could display incorrectly for promotional users. Improved data sync reliability for Keto-Mojo integrations. ### 1.0.46(69) — 2026-04-19 - Flutter SDK upgraded to 3.41.6 — improved performance, stability, and latest Dart 3.11.4 runtime - Firebase suite upgraded to latest — Firestore 6.x, Auth 6.x, Analytics 12.x, Crashlytics 5.x, Messaging 16.x, and all other Firebase packages updated to current major versions - AI Companion Messaging — evidence-based motivational messages during fasts, powered by a knowledge base from published fasting research - Insight Cards — contextual tips and fasting facts displayed during active sessions - Medical Supervision Banner — safety reminders for prolonged fasts - Abandoned Fast Detection — smart detection of forgotten fasts with a "Still Fasting?" prompt - Dependency health improvements — updated icons, device info, and underlying platform libraries ## Apps similar to SparkFast | App | Rating | Price | Category | | --- | --- | --- | --- | | [FastFlex Fasting Tracker](https://appshunter.io/ios/app/fastflex-fasting-tracker/id6756032313) | 5.0 (2) | Free | Health & Fitness | | [SkinSlay - AI Skincare Scanner](https://appshunter.io/ios/app/skinslay-ai-skincare-scanner/id6754167912) | — | Free | Health & Fitness | | [Intermit - Fasting Timer](https://appshunter.io/ios/app/intermit-fasting-timer/id6758806511) | — | Free | Health & Fitness | | [Fasting Tracker & Plan: Faylo](https://appshunter.io/ios/app/fasting-tracker-and-plan-faylo/id6745752898) | — | Free | Health & Fitness | | [MonPosture](https://appshunter.io/ios/app/monposture/id6444593917) | 5.0 (4) | Free | Health & Fitness | | [Coachman Pilates](https://appshunter.io/ios/app/coachman-pilates/id6463220176) | — | Free | Health & Fitness | --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-17.*