Simple is an intermittent fasting and weight loss app founded on behavior change, AI coaching, and structured habit building. It pairs users with an AI coach called Avo, provides personalised fasting schedules, food tracking with nutrition scores, and exercise plans including pilates, yoga, and walking routines. The app does not require calorie counting.
Reviewers give Simple an overall score of 4 out of 5. Users report losing significant weight: testimonials include 73 lbs, 76 lbs, and 50 lbs. The free version provides core fasting tracking, AI answers, and nutrition scores. The premium version costs as little as $5 per month on an annual plan. Simple is trusted by millions of users globally and has received awards for its AI coaching experience.
This review covers how the Simple app works, what results users achieve, who it suits, what the AI coach does, how much it costs, and how it compares to other weight loss apps. By the end, you will know whether Simple is the right tool for your weight loss goals.
What Is the Simple App?
Simple is an intermittent fasting and weight loss app that combines AI-powered coaching, personalised fasting schedules, food tracking, nutrition scoring, and habit education to help users lose weight through sustainable behaviour change rather than calorie restriction or food group elimination.
The app is built around time-restricted eating, the most popular form of intermittent fasting, which involves setting a specific eating window each day and fasting for the remainder. Simple assigns an initial fasting schedule based on the user’s lifestyle and goals, with the 16-hour fast and 8-hour eating window being one of the most commonly assigned patterns.
Simple is designed for both beginners and experienced fasters. The clean interface, AI coaching, and non-restrictive approach make it accessible to users with no prior experience of structured fasting. The app does not promote fasts longer than 24 hours and focuses on achievable 12-to-16-hour fasting windows that research supports for weight loss.
How Does the Simple App Work?
Simple creates a personalised weight loss programme from day one by assigning a tailored fasting schedule, pairing the user with AI coach Avo for daily personalised check-ins and actions, enabling food tracking with automatic nutrition scoring, and delivering educational content based on logged activity.
Avo, the AI coach, generates daily actions specific to each user, sends tips and insights in real time, and adjusts guidance as the user logs food, hydration, and activity. The coaching experience adapts continuously to what the user actually tracks. Fasting reminders match the user’s schedule and logging patterns automatically.
Food tracking uses a nutrition score system rating meals from low to high based on protein, sugar, fibre, saturated fat, and calcium content. Users do not count calories. Instead, they receive a nutrition quality signal for each logged meal that guides better food choices without the cognitive burden of precise tracking.
Who Is the Simple App For?
Simple is designed for adults who want to lose weight and improve eating habits without calorie counting, food group restrictions, or rigid meal plans, and who respond well to structured habit building, AI coaching accountability, and the simplicity of time-restricted eating as the primary dietary framework.
The app suits users who have tried calorie-counting apps and found them unsustainable. Simple’s behaviour change approach teaches users to understand hunger cues, improve meal quality, stay hydrated, and build movement habits without requiring precise nutritional tracking every day.
Simple is not ideal for users who need clinically supervised weight management, those with eating disorders or complex medical conditions affecting diet, or anyone who requires calorie tracking for specific health conditions. Independent healthcare advice should be sought before starting any new weight loss programme.
Does the Simple App Actually Help You Lose Weight?
Yes. User testimonials document significant weight loss results including 73 lbs, 76 lbs, 50 lbs, and 30 lbs, achieved through consistent use of Simple’s intermittent fasting framework, AI coaching, and food tracking over periods ranging from several months to over a year.
Intermittent fasting, the foundational strategy in Simple, has research support for weight loss. Time-restricted eating creates a natural caloric deficit by narrowing the daily eating window without requiring users to measure or restrict what they eat within that window. The reduction in eating hours reduces total daily intake for most users.
Reviewers who tested the app gave it an overall score of 4 out of 5, citing the quality of the AI coaching, the clean interface, the non-restrictive approach, and the educational content as strengths. The main limitations cited are the cost barrier of the premium subscription for full AI coaching access, and difficulty contacting customer service to cancel.
How Much Weight Can You Lose With Simple?
User-reported results with Simple range from modest losses of 10-20 lbs over several months to substantial losses of 50-76 lbs over longer periods, with outcomes depending on how consistently users follow the assigned fasting schedule, engage with AI coaching, and improve food quality within the eating window.
Simple does not publish average weight loss statistics from its user base. Results are reported through testimonials rather than clinical trial data. Teresa lost 73 lbs, Joelle lost 76 lbs, James lost 50 lbs, and Lori lost 30 lbs. These represent motivated, consistent users and may not reflect typical outcomes.
The app’s own positioning emphasises that results depend on honesty in logging, engagement with Coach Avo, and adherence to the fasting schedule. Users who engage fully with all features consistently report better outcomes than those using only the fasting timer without the coaching and food tracking elements.
How Quickly Does Weight Loss Start?
Most Simple users notice reduced appetite and improved eating awareness within the first 1-2 weeks of starting the fasting schedule, with measurable weight loss typically becoming apparent within the first 4-6 weeks of consistent use alongside genuine engagement with Coach Avo’s daily actions.
Intermittent fasting produces an initial rapid drop in weight during the first 1-2 weeks as the body depletes glycogen stores and reduces water retention. This is followed by slower, more sustainable fat loss as the caloric deficit compounds through consistent fasting windows and improved food choices.
Users who do not see progress within the first 4-6 weeks are advised to use the food logging feature to assess whether the eating window is expanding unintentionally, whether meal quality is suboptimal, and whether hydration targets are being met. Coach Avo can identify these patterns and suggest adjustments.
What Are the Best Features of Simple?
Simple’s standout features are Coach Avo (the personalised AI coach delivering daily tailored actions and real-time insights), nutrition scoring for logged meals, photo and voice food tracking, integrated pilates, yoga and walking plans, and a fasting timer with smart reminder customisation based on individual schedules.
Coach Avo is the feature that differentiates Simple from basic fasting timer apps. Avo creates actions specific to each user’s progress, not generic advice. Users describe Avo as providing ‘human warmth’ in its communication style, reducing the isolation that commonly leads to app abandonment in the first weeks of a new routine.
The nutrition scoring system teaches users to recognise high and low-quality meals without calorie arithmetic. Protein, fibre, and sugar content are weighted into a single score per meal. Over time, users develop intuitive pattern recognition for meal quality that persists even when not actively using the app.
Simple App Key Features:
- Coach Avo: personalised AI coach with daily check-ins and actions
- Fasting timer with customisable start and stop times
- Photo and voice food tracking
- Nutrition scores rating meal quality (low to high)
- Pilates, yoga, and walking exercise plans
- Hydration and weight tracking with reminders
- Educational content library on food, habits, and health
Does Coach Avo Actually Help?
Yes. Users consistently credit Coach Avo with providing the accountability and personalised guidance that sustains engagement beyond the initial weeks, delivering daily actions and timely insights based on what each user actually logs rather than generic weight loss advice.
One tested user described Avo as an ‘essential part of the daily routine,’ providing guidance and support whenever needed. Another highlighted how the AI system helped with mindful meal planning in a way that changed their relationship with food over months of use.
Avo’s effectiveness depends on honest logging. Users who track food accurately receive more relevant feedback and better-calibrated daily actions than those who log inconsistently. The system is as good as the data it receives. Consistent input produces consistently useful coaching output.
What Are the Side Effects or Downsides of Simple?
Intermittent fasting through Simple can cause headaches, fatigue, irritability, and hunger during the initial adaptation period, typically lasting 1-2 weeks, as the body adjusts to the new eating window and the brain adapts to receiving energy at different times than it is accustomed to.
Some users experience difficulty sleeping if their eating window closes too early in the evening, or if they begin fasting before the body has adequately fuelled overnight. Simple allows users to adjust fasting window start and finish times, which resolves most timing-related side effects.
Intermittent fasting is not appropriate for everyone. Pregnant or breastfeeding women, individuals with a history of disordered eating, those with type 1 diabetes, and anyone on medications requiring food intake at specific times should consult a healthcare provider before using Simple or any fasting-based approach.
Is Simple Easy to Cancel?
The Simple app allows users to request cancellation within 30 days of signing up or before automatic subscription renewal, though multiple reviews indicate that contacting customer service to complete the cancellation can be slower and more difficult than typical subscription apps, which is a noted limitation of the service.
Users who want to trial Simple without commitment risk should use the free version first before purchasing a premium subscription. The free version provides core fasting tracking, AI answers from Coach Avo, and nutrition scores, which is sufficient to evaluate whether the app’s approach suits their lifestyle.
Premium subscribers who encounter cancellation difficulty should use the in-app support channel or official email rather than attempting to cancel through app store settings alone, as some users report that the most reliable cancellation route is direct contact with the Simple customer service team.
How Much Does Simple Cost?
Simple’s premium subscription costs $15 per month on a monthly plan, $9.99 per month on a three-month plan, and less than $5 per month on an annual plan. This places Simple among the most affordable AI-coaching weight loss apps available, significantly cheaper than human nutritionists or dietitian services.
Simple App Pricing:
| Plan | Monthly Cost | Total Cost |
|---|---|---|
| Free | $0 | $0 |
| Monthly premium | $15/month | $15/month |
| 3-month premium | ~$9.99/month | ~$29.97 |
| Annual premium | Under $5/month | Under $60/year |
The free version provides basic fasting tracking, real-time Coach Avo answers, nutrition scores for logged meals, and all wellness habit trackers. This is a substantial free offering. Premium unlocks daily personalised check-ins, the full educational content library, and deeper AI coaching customisation.
Is Simple Worth the Price?
Yes. At under $5 per month on an annual plan, Simple delivers AI coaching, personalised fasting schedules, nutrition guidance, and exercise plans at a price point that represents exceptional value compared to human health coaches, dietitian consultations, or other premium weight loss app subscriptions.
The app is particularly good value for users who respond well to accountability tools and coaching-style guidance. For those who simply need a fasting timer, the free version is sufficient. For those who benefit from daily personalised actions and educational content, premium is cost-justified at annual pricing.
Simple does not replace medical weight management for users who need clinical intervention. For users who are healthy and motivated but need structure and accountability to sustain a dietary change, Simple provides a high-quality, evidence-aligned framework at an accessible price point.
How Does Simple Compare to Other Weight Loss Apps?
Simple scores 4 out of 5 in independent testing, placing it among the highest-rated intermittent fasting apps, with advantages over basic fasting timer apps in AI coaching quality and educational depth, while differing from calorie-counting apps by prioritising behaviour change and meal quality over numerical tracking.
Compared to apps like MyFitnessPal or Lose It, Simple requires less daily effort and removes calorie arithmetic from the process. This lower friction is both a strength and a limitation. Users who need precise calorie tracking for health reasons will find Simple’s nutrition scoring too approximate. Users who find calorie counting unsustainable will find Simple’s approach more maintainable.
Compared to medication-based weight loss programmes, Simple produces results more slowly with lower average weight loss. Users seeking GLP-1 medication-level results (15-22% body weight reduction) will not achieve those outcomes through intermittent fasting alone. Simple is a lifestyle tool, not a medical intervention.
Should You Try Eat Proteins Alongside Simple?
Eat Proteins provides protein-focused nutrition coaching that directly enhances the Simple app’s intermittent fasting framework, helping users maximise fat loss, preserve lean muscle, and build the dietary habits that sustain results long after the fasting structure itself becomes second nature.
The most common limitation of intermittent fasting for weight loss is inadequate protein intake during the eating window. When total daily food intake drops through fasting, protein is frequently the first macronutrient to fall short. Insufficient protein during caloric restriction accelerates muscle loss and reduces metabolic rate over time.
Eat Proteins coaches teach Simple users to structure their eating window around protein-first meals that deliver 1.2-1.6 g per kg (0.55-0.73 g per lb) of body weight daily. This preserves lean muscle, sustains satiety through the fasting period, and produces a better body composition outcome than intermittent fasting focused on restriction alone.
Why Do Our Experts at Eat Proteins Recommend Protein-First Fasting?
Our coaches at Eat Proteins consistently find that users who combine intermittent fasting with adequate daily protein achieve better fat loss, less muscle loss, and stronger long-term weight maintenance than those who fast without deliberate protein planning, regardless of which fasting app they use.
Protein is the key variable that separates effective intermittent fasting from counterproductive caloric restriction. An eating window full of low-protein, high-carbohydrate meals does not produce the body composition improvements that protein-optimised fasting achieves. Simple teaches when to eat. Eat Proteins teaches what to prioritise when the window opens.
Users who add Eat Proteins coaching to their Simple routine build the nutritional foundation that makes their results last. Fasting schedules can be maintained indefinitely. Here’s the bottom line: Simple gives you the structure. Eat Proteins fills it with the right fuel.