Health, fitness & wellbeing
Nearly a quarter of UK adults who use generative AI, 24.7% in the government's public attitudes survey, have used it for health, fitness or mental health. The tools here mostly add an AI chat or photo feature to an existing tracker, and the chat is often the weakest part, with Oura, WHOOP and Google Health owners reporting invented trends in 2026. None of them is a substitute for a GP, and the mental-health chatbot reviewed here is not recommended.
Updated monthly.
Kenning's picks
Ranked by Kenning score out of 25. Tools scoring 12 or less are marked not recommended.
Flo
Flo predicts periods and fertile days from logged cycles and is free for basic tracking, with a Premium tier that adds a 24/7 Health Assistant. Mozilla scored it 7 out of 10 for privacy in July 2026 and found no symptom or pregnancy data going to ad partners, but Flo paid $8M in a 2026 US settlement over data it shared with Facebook and Google before 2019. Anonymous Mode removes the name and email from the account for anyone who wants extra distance.
Best for Tracking periods and fertile days on a phone
Google Health (formerly Fitbit) with Health Coach
Basic step, sleep and heart tracking stays free with a Fitbit or Pixel Watch, and the Gemini coach costs £7.99 a month on top. Tech Advisor called the coach the biggest shake-up in fitness apps in years, while a July 2026 user thread was mostly people switching it off. Google says coach chats are not used to train its models unless a user opts into research.
Best for Fitbit and Pixel Watch owners who want workout plans in a chat
Cal AI
Cal AI turns a meal photo into a calorie and macro estimate in seconds, which makes logging far less tedious than typing in every ingredient. An NIH test of four photo apps including Cal AI found they all undercounted calories and fat, and its own site says it is about 80% accurate. There is no free tier beyond a 3-day trial.
Best for People who want rough calorie logging with almost no effort
Oura
Reviewers at the Guardian, PCMag and TechRadar rate the Oura Ring 5 among the best sleep trackers sold, though it costs £399 and most data sits behind a £5.99 monthly membership. The Advisor chatbot is the weak part, with 2026 user threads reporting it making up trends and giving wrong instructions about the app itself. A US class action filed in August 2026 disputes how accurate its sleep-stage figures are.
Best for People who want sleep and recovery tracking without wearing a watch
WHOOP
WHOOP's band and app get good marks from reviewers for sleep and recovery tracking, and the 14-day battery is a real plus. The AI coach is the weak part, with user reviews owners in 2026 reporting it mixing up dates, inventing data and giving advice that contradicts the rest of the app. There is no way to buy the band outright, so the cheapest route is £169 a year.
Best for People who train hard and want daily recovery and sleep scores
Wysa
Wysa is free to chat with, has been trialled in NHS Talking Therapies waiting lists, and says plainly it is not for crises and not a medical device. A 2026 NHS-linked trial found no evidence it treated depression, and Common Sense Media rated the consumer app Unacceptable for teens in May 2026 after it flirted with and played adult games with a 13-year-old test account. It is not suitable for anyone under 18 or in distress.
Best for Adults wanting structured self-help exercises between other support
More tools
Ada
AI symptom checker that asks questions and suggests possible causes and where to seek care.
Bevel: AI Health Coach
iPhone app that turns Apple Watch data into recovery, strain and sleep scores with an AI coach.
Calo: AI Food Calorie Counter
Photo calorie counter that competes with Cal AI.
Clue
Berlin-based period tracker that Mozilla rated 8/10 for privacy in 2026.
Docus
AI health assistant that explains lab results and answers health questions, with tools for doctors and labs
Earkick
Mood and anxiety tracker with a cartoon panda chatbot, breathing exercises and habit suggestions.
Empirical Health
US heart health service that pairs a 100-biomarker blood test with an app for risk scores, nutrition and care.
Fit Senpai
Builds a personal workout plan and matching meal plan with recipes and a shopping list.
Fitbod
Gym app that builds weight-training workouts from past sessions.
Foodvisor
French photo-based calorie and nutrition tracker.
freddy
Connects wearables, glucose monitors and gym apps to Claude, ChatGPT and other AI chats for questions about personal health data.
Garmin Connect+ (Active Intelligence)
Paid tier of Garmin's free app that adds AI training insights.
Headspace (Ebb)
Meditation and sleep app with Ebb, an AI companion for check-ins.
Health in ChatGPT
A separate health space in ChatGPT that can read connected medical records and fitness apps
Life Note
A journaling app where AI mentors styled on famous thinkers reply to diary entries.
Mindsera
An AI journal that asks prompts, spots patterns in mood and thinking, and suggests reflections.
MyFitnessPal (Meal Scan)
Long-running calorie counter with photo Meal Scan logging; owner of Cal AI since 2026.
Runna
Running-plan app that adapts training to each runner; owned by Strava.
Sonia: AI for Mental Health
AI mental health app for talking through stress and worries by voice or text, with support plans
StressWatch: AI Stress Monitor
Apple Watch app that estimates stress levels from heart data.
Vital
Creates personalised guided meditations and sleep stories on demand from a word or sentence typed into the app.