# Interval Weight Loss — Scientifically proven > Scientifically proven program for sustainable weight loss and metabolism reset. (iPhone/iPad app by Interval Weight Loss Pty Ltd.) - Source: https://appshunter.io/ios/app/interval-weight-loss/id1663437343 (this page in markdown: same URL + `.md`) - Developer: [Interval Weight Loss Pty Ltd](https://appshunter.io/developer/1663437345) - Category: Health & Fitness - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 15.0 · 119 MB - Languages: English - Released: 2024-01-04 - Data updated: 2026-08-14 - Monetization: subscription - User reviews in markdown: https://appshunter.io/ios/app/interval-weight-loss/id1663437343/reviews.md ## What is Interval Weight Loss? Interval Weight Loss is a scientifically developed health and weight loss program that's proven to deliver lasting results. It is currently ranked the number 1 program globally for sustainable weight loss. Developed and tested by Dr Nick Fuller from the University of Sydney, IWL takes a stepped approach to weight loss that's sustainable, resets your metabolism, and allows your body to return to a healthy weight without going into starvation mode. Unlike other programs, we’re not sexy, but we are proven - and we’re easy for everyone to follow. Download and start your weight loss journey today. FEATURES Transform yourself building healthy habits: Use our habit tracker to consistently build and maintain habits from IWL’s core principles. Integrate daily routines like balanced eating, regular exercise, and good sleep patterns for lasting health transformations. Flexible meal plans for your lifestyle: Gain access to an extensive collection of adaptable recipes that will help you enjoy a varied diet without feeling restricted. New recipes are regularly added to cater to diverse tastes and nutritional needs. Empower yourself with knowledge: Dive into videos and articles to understand the science behind IWL’s weight loss and wellness strategies, equipping you with the knowledge to make informed health decisions for lasting change. Tools to track your success: Monitor your journey and celebrate your milestones in weight loss, blood changes, waist measurements and more. See the tangible results of your long-term efforts. Your personal dietitian, just a message away: Benefit from 24/7 access to a personal IWL dietitian with the PLUS plan, offering customised dietary guidance to align your nutritional choices with your personal health goals, tailored to your unique journey with IWL. View terms here: Privacy policy: https://intervalweightloss.com/privacy-policy Terms of use: https://intervalweightloss.com/terms-and-conditions Billing Terms: https://intervalweightloss.com/billing-terms ## Key features - Habit tracker for balanced eating, exercise, and sleep - Flexible and adaptable meal plans with new recipes - Educational videos and articles on weight loss science - Tools to track weight, blood changes, and measurements - 24/7 access to a personal dietitian (PLUS plan) - Stepped approach to weight loss without starvation mode ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | IWL Essential | $40.00 | per month | | IWL Plan Quarterly | $59.00 | per 3 months | | IWL Plan Yearly | $179.00 | per year | | IWL Plus Quarterly | $129.99 | per 3 months | | IWL Plus Yearly | $399.00 | per year | | IWL Plan Quarterly (Trial) | $59.00 | per 3 months | | IWL Plus Quarterly (Trial) | $129.99 | per 3 months | | IWL Plan Yearly (Trial) | $179.00 | per year | | IWL Plus Yearly (Trial) | $399.00 | per year | | IWL Plan Monthly | $14.00 | per month | | IWL Plus Monthly | $29.00 | per month | ## Recent user reviews (5 of 5) All indexed reviews: https://appshunter.io/ios/app/interval-weight-loss/id1663437343/reviews.md ### 5/5 — Life changing *2025-10-16* This is the first eating plan that has worked for me in 10 years. The weight has fallen off and my overall health has improved. I’ve found the principles not challenging to apply. Big to small meals with no measuring and weighing and month on, month off of going hard on exercise, has been achievable for me. And I no longer feel guilt in eating. Winning **Developer response:** Thank you so much for your wonderful review! 🌟 We’re thrilled to hear that the plan has made such a positive difference for you after so many years. Knowing that the principles feel easy to follow and fit into real life - without measuring, weighing, or guilt - is exactly what we hope for every user. Congratulations on your progress, and thank you for sharing your journey with us. We’re cheering you on! 💛 — The Interval Weight Loss Team ### 5/5 — No guilt! *2025-06-22* I really am quite surprised with how I feel even after just one week. Just goes to show how bad my diet was! The guilt associated with eating is so ingrained after 25 years of trying to manage my weight. This plan is quite liberating. I know it's only Week 2, but I do feel sooo much better already. Being allowed to incorporate some champagne too is just the best! 😉 **Developer response:** Thank you for your kind words and lovely review. Yes, it might be early days but it only gets easier with time. We are now the Number 1 program for sustainable weight loss with real healthcare professionals to help you every step of the way. Keep up the great progress and make sure to reach out to the IWL team at any stage of your journey. In health, the IWL team. ### 5/5 — Different approach *2025-04-14* Science backed eating focused on developing good and sustainable habits and avoiding rebound weight gain. App helps you track your weight and other health related metrics. Recommended. **Developer response:** Thank you for your kind words and recommendation for the IWL program. We are very glad to hear of your experience with the app as well. The IWL healthcare professional team is here to help you every step of the way. ### 2/5 — Sadly poor customer service *2024-05-09* I love the book, and I love the program, the science makes sense and the app works, I’m enjoying it so far and will continue with it. Unfortunately the customer service I received was robotic and didn’t solve the basic problem I approached them with nor address my complaint or apologise. I accidentally signed up for a quarter instead of monthly, I asked for a refund as I hadn’t budgeted for the large sum of money, I wanted to pay monthly and immediately on cancelling the quarter payment signed up to pay monthly assuming I’d be able to be refunded, but that was refused in return for credit (which is no different to paying quarterly), and the person I spoke to by email was unhelpful and very short. It’s a shame as as I said I really get the program I think it’s great. So I’ll keep going with it and just remind myself not to email in! ### 1/5 — Currently not working *2024-03-16* App keeps refreshing several times a second, making it impossible to use. Have updated and re-downloaded but issue remains. **Developer response:** We are sorry to hear you are experiencing difficulties. This has not been evident with any of our other members using the app. We also offer a current 30-day free trial of the IWL program so if any problems, please make sure to get in touch with our team at iwl@intervalweightloss.com.au We are real healthcare professionals working with people on their long-term health and weight loss journey so we want to make sure we can help you too. ## Frequently asked questions about Interval Weight Loss ### What is the core principle of Interval Weight Loss? Interval Weight Loss follows a scientifically developed, stepped approach designed to reset your metabolism and achieve sustainable weight loss without entering starvation mode. It focuses on building healthy habits like balanced eating, regular exercise, and good sleep patterns. ### Does Interval Weight Loss offer personalized guidance? Yes, the IWL Plus plan provides 24/7 access to an accredited dietitian who offers customized dietary guidance tailored to your personal health goals and unique journey with IWL. ### What kind of tracking tools are available in Interval Weight Loss? The app includes tools to monitor your progress in weight loss, blood changes, and waist measurements, allowing you to see the tangible results of your long-term efforts and celebrate milestones. ### How does Interval Weight Loss differ from other weight loss programs? Unlike programs that might be perceived as 'sexy,' Interval Weight Loss emphasizes being proven and easy to follow. It focuses on sustainable changes and metabolism resetting rather than restrictive dieting. ### What are the subscription options for Interval Weight Loss? Interval Weight Loss offers weekly (via website) and quarterly subscriptions. Specific monthly and quarterly plans are available, including an IWL Plus option for dietitian access. Some plans may offer a free trial period. ### Can I cancel my Interval Weight Loss subscription? Yes, you can cancel your subscription at least 24 hours before the end of the current billing period to prevent automatic renewal. However, all subscription payments are final and non-refundable, and you will retain access until the end of your paid period. ### Is Interval Weight Loss suitable for all ages? Interval Weight Loss has an age rating of 4+, indicating it is suitable for a broad audience. The program's focus on healthy habits and scientific principles makes it adaptable for various users. ### How often is Interval Weight Loss updated? The application was last updated on March 18, 2026, with version 1.1.10. This indicates a commitment to ongoing development and improvements to the program. ## Version history (last 5 releases) ### 1.0.12 — 2026-08-08 Fixed bugs and improved app performance ### 1.1.11 — 2026-07-15 Remove in-app purchase ### 1.1.10 — 2026-03-18 bug fixes and performance improvements ### 1.1.9 — 2026-03-11 bug fixes and performance improvements ### 1.1.8 — 2026-02-06 bug fixes and performance improvements ## Apps similar to Interval Weight Loss | App | Rating | Price | Category | | --- | --- | --- | --- | | [Deliciously Ella: Feel Better](https://appshunter.io/ios/app/deliciously-ella-feel-better/id1445510165) | 4.9 (7,436) | Free | Health & Fitness | | [Jillian Michaels \| Fitness App](https://appshunter.io/ios/app/jillian-michaels-fitness-app/id1190148494) | 4.7 (5,616) | Free | Health & Fitness | | [Clear Minds - Hypnotherapy](https://appshunter.io/ios/app/clear-minds-hypnotherapy/id1600470480) | 4.8 (1,699) | Free | Health & Fitness | | [Walking Yoga](https://appshunter.io/ios/app/walking-yoga/id6636476252) | 4.2 (2,218) | Free | Health & Fitness | | [Hava – Lose weight, feel full](https://appshunter.io/ios/app/hava-lose-weight-feel-full/id6450675042) | 4.6 (1,420) | Free | Health & Fitness | | [WOWBODY: Home Workout Women](https://appshunter.io/ios/app/wowbody-home-workout-women/id1561735630) | 4.9 (506) | 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 2026-08-14.*