Simple has carved out a position as the friendly, approachable intermittent fasting app. Where other fasting apps feel clinical or intimidating, Simple uses a warm, encouraging tone and an AI coach that guides you through your fasting journey with empathy and patience. The app makes fasting accessible to people who might otherwise find the concept overwhelming.
But here is the fundamental issue with any fasting app, no matter how friendly: fasting is one behavior within one dimension of metabolic health. You can have a perfect fasting schedule while sleeping five hours a night, never exercising, eating processed food during your eating window, and carrying chronic stress. The timer shows a beautiful streak. Your health tells a different story.
This comparison looks at what Simple does well, where the fasting-first approach reaches its limits, and how ooddle addresses metabolic wellness as part of a complete system. If you are weighing several timers, see how the major fasting apps compare.
Making fasting simple is a good start. Making wellness simple is the real goal.
Quick Summary
- Choose Simple if you want a friendly, guided introduction to intermittent fasting with coaching support and a non-intimidating approach.
- Choose ooddle if you want a complete wellness system where meal timing is one component alongside nutrition quality, movement, mental health, recovery, and daily optimization.
What does Simple do well?
Simple does onboarding well. Its warm tone, AI coach, food logging, and fasting education make intermittent fasting approachable for newcomers.
Approachable Fasting Experience
Simple strips away the complexity that intimidates fasting newcomers. The interface is warm, the language is encouraging, and the app gently guides you through your first fasts without making it feel extreme. For people curious about fasting but hesitant to start, this low-friction entry point is genuinely valuable.
AI Coaching
The in-app AI coach answers questions about fasting, provides encouragement during difficult fasting periods, and offers tips for making fasting more sustainable. This conversational support reduces the feeling of doing something unfamiliar alone.
Meal Logging Integration
Simple includes basic food logging alongside fasting tracking, which connects what you eat to when you eat. This is more holistic than pure fasting timers that ignore food quality entirely.
Educational Content
The app includes articles and tips about fasting science, common mistakes, and how to adjust your approach based on your experience. For newcomers, this educational layer builds confidence and understanding.
Where does Simple fall short?
Simple falls short on scope. It centers on the fast timer and leaves movement, sleep, mental health, and broader metabolic factors out of the system.
Fasting-Centric Identity
Simple is fundamentally a fasting app. Everything in the experience revolves around when you eat. While food logging adds some nutritional context, the app's identity and architecture center on the fast timer. If fasting is not the right tool for your goals, Simple has nothing else to offer. The same ceiling shows up in another fasting-first app.
No Exercise or Movement System
Physical activity profoundly impacts metabolic health, insulin sensitivity, and body composition. Simple does not include any movement guidance. Your fasting schedule exists in complete isolation from your physical activity, which limits the metabolic benefits you could achieve.
No Recovery or Sleep Support
Sleep deprivation increases insulin resistance and hunger hormones, undermining the metabolic benefits fasting might provide. Simple does not address sleep or recovery. You could have a perfect fasting schedule while chronic poor sleep cancels out every benefit.
No Mental Health Component
Fasting can be stressful, especially for people with a complicated relationship with food. Simple does not include tools for managing the psychological aspects of restricted eating. For some users, fasting creates anxiety rather than reducing it, and the app has no way to detect or address that outcome.
Limited Metabolic Scope
Metabolic health involves dozens of factors: sleep quality, stress levels, movement patterns, food quality, hydration, circadian rhythm alignment, and more. Simple addresses one factor, meal timing, and presents it as the primary lever. This is a significant oversimplification of metabolic health.
What does ooddle do differently?
ooddle treats meal timing as one input inside a five-pillar system spanning Metabolic, Movement, Mind, Recovery, and Optimize, so fasting supports metabolic health instead of standing in for it.
Metabolic Pillar Covers the Whole Picture
ooddle's Metabolic pillar goes far beyond meal timing. Your daily protocol includes hydration targets, protein goals, food quality guidance, and meal timing suggestions when appropriate. Fasting can be part of the picture, but it is never presented as the whole picture. That is broader than a dedicated hydration tracker.
Movement That Drives Metabolic Health
ooddle's Movement pillar includes exercise that directly improves metabolic function. Post-meal walks for glucose management, strength training for insulin sensitivity, and daily activity targets that keep your metabolism active. Your movement and your metabolism work together in the same system.
Recovery for Metabolic Function
ooddle's Recovery pillar ensures that your sleep and rest support your metabolic health. Sleep optimization tasks, stress reduction protocols, and recovery-day guidance all contribute to the hormonal balance that determines how your body processes food and energy.
Mind Pillar for Eating Behaviors
The Mind pillar addresses the psychological aspects of eating and fasting. Stress management tools, mindfulness around food, and cognitive techniques for maintaining a healthy relationship with eating. Your mental state around food matters as much as the food itself. Slow, structured breathing is one such tool. A 2023 Scientific Reports meta-analysis of 12 randomized trials with 785 adults found breathwork produced a small-to-medium reduction in self-reported stress (Hedges g = -0.35) versus control conditions.
Personalized and Adaptive
ooddle adapts your daily protocol based on your feedback, your energy levels, and your patterns. If fasting works for you, it can be part of your Metabolic approach. If it does not, the system adjusts to alternative strategies. The goal is your metabolic health, not adherence to any single approach.
How do Simple and ooddle pricing compare?
Both offer a free tier and a paid upgrade. Simple charges for fasting coaching, while ooddle Core charges for personalized protocols across all five pillars.
- Simple Free: Basic fasting timer and limited features.
- Simple Premium: Approximately $59.99/year or $14.99/month. AI coaching, meal logging, and full content library.
- ooddle Explorer: Free. Core features and basic daily protocols across all five pillars.
- ooddle Core: $12/month. Full AI-personalized protocols covering metabolic, movement, mind, recovery, and optimization.
- ooddle Pass: $39/month (coming soon). Premium tier with advanced features.
Simple Premium is moderately priced for a fasting app with coaching. ooddle Core costs more but addresses metabolic health through five pillars rather than through meal timing alone. If your metabolic goals extend beyond fasting, ooddle provides the broader system. The category is enormous. Sensor Tower's 2025 State of Mobile Health and Fitness report counted 3.6 billion global health and fitness app downloads in 2024, up 6 percent year over year, with in-app purchase revenue hitting a record 385 million dollars in January 2025.
The Bottom Line
Simple is a well-designed fasting app that makes intermittent fasting accessible to newcomers. If you are curious about fasting and want a gentle, guided introduction, Simple provides that with warmth and clarity. Newcomers can also scan the best intermittent fasting apps first.
But if your goal is metabolic health rather than just a fasting streak, meal timing alone is not enough. How you sleep, move, manage stress, and nourish your body all matter as much or more than when you eat. A fasting app simplifies one behavior. A wellness system simplifies your entire approach to health. Streaks also fade for many users. In a 2019 Journal of Medical Internet Research randomized trial of a physical activity app among 301 Australian adults, 31.9 percent of gamified and 39.4 percent of basic app users lapsed into 30 days of nonuse.
We built ooddle because we think the goal should not be "make fasting simple." The goal should be "make wellness simple." That is a much bigger and more valuable problem to solve.
Comparisons reflect publicly available product information as of April 2026. Features, pricing, and policies change frequently. We update articles when we spot changes. Found something out of date? Let us know.