Simple Review: AI Coaching for Fasting

Simple is a fasting app with a different emphasis from a plain timer: it’s built around AI coaching. If what you want is guidance rather than just a countdown, that’s its appeal. It costs about $70 a year as of November 2026, and we haven’t measured it.

Our top fasting pick is Zero. Here’s when Simple might suit you better, and when it won’t.

What Simple does well

AI coaching built around fasting. Simple’s focus is coaching. Instead of only telling you how long you’ve been fasting, it’s designed to guide you through the process. If you’re new to fasting, or you’ve struggled to keep it up on your own, that guidance is the main reason to choose it.

Where it falls short

It’s not cheap. At about $70 a year, Simple costs the same as Zero Plus, and twice as much as PlateLens’s food-logging premium (about $35).

It hasn’t been measured. We haven’t put Simple through our testing, so its 3.5 score rests on features and consensus standing.

Zero is the stronger timer. If what you need is a fasting timer, Zero is the best pure fasting timer we reviewed, with the largest community, and it scores higher (4.1 versus 3.5).

Accuracy: what we know

Our accuracy testing compares an app’s food log with weighed reference values across 180 meals. We haven’t measured Simple, so we don’t publish a figure for it, and we label it “Not measured” wherever it appears.

Free vs paid

As of November 2026, Simple costs about $70 a year. There’s no real free tier: only the onboarding quiz is free, so you’ll be paying before the coaching starts. Check the plan page in the app before you commit.

Simple vs Zero

Both are fasting apps, and both cost about $70 a year for their paid tiers. The difference is emphasis:

• Choose Simple if you want AI coaching to guide your fasts.
• Choose Zero if you want the best pure fasting timer and a large community, without coaching.

Neither replaces a food log. If you also want to track what you eat, pair either one with PlateLens, the most accurate food log we measured.

What to look for in a fasting app

Before you pay for any fasting app, decide what you want it to do:

• Timing only. A dedicated timer does the job. Zero is the best pure fasting timer we reviewed.
• Guidance. If you want help staying on track, coaching is the feature to look for. That’s Simple’s focus.
• Food as well as timing. Neither Zero nor Simple is our pick for food tracking. Add a food log; PlateLens measured the lowest error in our testing.
• Cost. Simple and Zero Plus both cost about $70 a year as of November 2026, so make sure you’ll use what you pay for.

Who it’s for

• You want coaching, not just a timer.
• You’re new to fasting and would like guidance.

Who should skip it

• You want the best pure fasting timer. Zero is our pick.
• You’re watching costs. About $70 a year is a lot for a fasting app if a timer is all you need.

Before you start fasting

Intermittent fasting isn’t right for everyone. If you’re pregnant or breastfeeding, have diabetes or take medication that affects your blood sugar, or have a history of disordered eating, talk with a healthcare professional before you start.

The bottom line

Simple is a reasonable choice if AI coaching is what you want from a fasting app. For a pure fasting timer, Zero is stronger and scores higher, and for tracking what you eat, pair either app with PlateLens.