Mental-health apps fall into three groups: meditation and sleep, mood and habit tracking, and on-demand therapy. These picks either have clinical evidence, licensed-clinician involvement, or unusually transparent privacy practices. None replaces therapy or psychiatric care for moderate-to-severe conditions.
Crisis lines are not on this list. If you are in crisis, contact a national hotline now - not an app:
- US / Canada: 988 (Suicide and Crisis Lifeline, calls and texts)
- UK / Ireland: 116 123 (Samaritans, free, 24/7)
- South Africa: 0800 567 567 (SADAG Suicide Crisis Line)
- Australia: 13 11 14 (Lifeline Australia)
- Worldwide directory: findahelpline.com
TL;DR - app comparison table
| App | Type | Free tier | Clinical evidence | Privacy notes |
|---|---|---|---|---|
| Headspace | Meditation / sleep | 10-day Basics | 100+ peer-reviewed papers | Subscription content |
| Calm | Meditation / sleep stories | Limited | Some studies | Subscription gated |
| Woebot | CBT chatbot | Fully free | Multiple RCTs | No ads, free |
| BetterHelp | Therapy marketplace | None | n/a (human therapists) | 2023 FTC settlement on data; check current policy |
| Talkspace | Therapy + psychiatry | None | n/a | Some US insurance covers |
| Insight Timer | Meditation library | Large free library | Limited app-specific studies | Free tier is usable |
| Daylio | Mood / habit tracker | Fully functional | n/a (it is a tool) | Local storage by default |
| How We Feel | Emotion granularity | Fully free | Linked to Yale CEI research | Nonprofit, transparent |
| Smiling Mind | Mindfulness for kids/teens | Fully free | Used in schools | Nonprofit |
| PTSD Coach | Trauma adjunct tool | Fully free | VA / DoD developed | US government privacy policy |
What mattered in the review
The review favours published clinical evidence, licensed-clinician involvement in therapy services, App Store and Google Play privacy labels, free-tier usefulness, and whether basic safety features are locked behind subscriptions.
This is editorial guidance, not medical advice. Apps complement professional care; they do not replace it for moderate-to-severe mental-health conditions. For any specific condition, talk to a clinician.
1. Headspace - polished beginner meditation, deepest research catalogue
Headspace has one of the most polished beginner meditation onboardings and a substantial published clinical-research catalogue (over 100 peer-reviewed publications across stress, sleep, focus). Free 10-day Basics course; paid tier unlocks the full library.
This is strongest for meditation beginners, stress practice, and sleep-routine support. The subscription is the catch, since most content is paid. Read the Headspace Privacy Center.
2. Calm - sleep stories and breathwork
Calm’s sleep stories (read by Matthew McConaughey, Stephen Fry, and others) are the feature that built the brand. Strong meditation, breathwork, and music library alongside. Annual cost is comparable to Headspace; the differentiator is the celebrity narration and night-mode emphasis.
Calm is best suited to sleep-onset trouble and evening wind-down routines. Most useful content is subscription-gated. Read the Calm Privacy Policy.
3. Woebot - CBT chatbot with published RCTs
Woebot is an AI-driven CBT chatbot developed by a team led by clinical psychologist Alison Darcy. Multiple published RCTs show modest improvements in depression and anxiety symptoms after 2-week use. Free, no ads.
Woebot suits people curious about CBT skills without committing to therapy. A chatbot has clear limits and is not appropriate for moderate-to-severe symptoms. Read Woebot Privacy.
4. BetterHelp - at-scale therapy access (read the FTC history)
BetterHelp connects you with a licensed therapist for text, audio, or video sessions, typically at lower cost than in-person therapy. Therapists are licensed clinicians. Note: BetterHelp settled a 2023 FTC case over health-data sharing - they say their practices have changed, but it is part of the record and you should read the current privacy policy carefully before connecting health data.
BetterHelp can help when local in-person therapy is scarce and speed matters. Therapist quality varies, so check credentials, fit, and the data-sharing history. Read BetterHelp Privacy carefully given the prior FTC action.
5. Talkspace - similar marketplace, US insurance coverage
Talkspace operates similarly to BetterHelp - licensed therapists via app. Covered by some US insurance plans, which is rare among on-demand therapy. Psychiatry (medication management) is offered alongside therapy in the US.
Talkspace is most relevant for people with US insurance coverage or those needing both therapy and medication management. Quality-control concerns are similar to any at-scale therapy marketplace. Read Talkspace Privacy.
6. Insight Timer - the largest free meditation library
Insight Timer has the largest free meditation library of any app, with over 200,000 free guided sessions from teachers. The paid tier exists, but the free tier is usable in a way many “freemium” wellness apps are not.
Insight Timer fits people who do not want to pay and experienced meditators who want variety. Quality varies between teachers, and there is no structured curriculum like Headspace. Read Insight Timer Privacy.
7. Daylio - no-account mood tracker
Daylio is a no-account-required mood and habit tracker. Two taps per day records mood + activities; long-term graphs help spot patterns. Free version is fully functional; paid version adds backup and themes. Stores data locally by default, which is unusual and welcome.
Daylio is useful for spotting mood patterns or sharing between-session data with a therapist. It is a tracker, not an intervention or advice source. The privacy advantage is local storage by default and limited data sharing.
8. How We Feel - emotion granularity, nonprofit
Built by a nonprofit team including researcher Marc Brackett (Yale Center for Emotional Intelligence) and Ben Silbermann (Pinterest co-founder). Helps you name emotions more precisely than “good/bad”. Free, no ads, no subscription.
How We Feel suits kids, teens, and adults building emotional vocabulary. It is extremely simple by design. The How We Feel team is nonprofit and publishes transparent policies.
9. Smiling Mind - free mindfulness for kids and teens
Australian nonprofit; offers structured mindfulness programs for kids (ages 7+), teens, and adults. Fully free, no subscription, no ads. Used in many Australian schools.
Smiling Mind works for parents introducing mindfulness to children and teachers using it in classrooms. The UI is less polished than Calm or Headspace, but the app is free and nonprofit. Read Smiling Mind Privacy.
10. PTSD Coach - VA-developed trauma adjunct
PTSD Coach is a free app developed by the US Department of Veterans Affairs and the Department of Defense, intended for adults with PTSD or in trauma recovery. Includes coping tools, education, and links to professional help. Evidence-based. Designed as an adjunct to professional treatment, not a replacement.
PTSD Coach is for trauma survivors using it alongside professional treatment. Trauma treatment generally requires a clinician; this is an adjunct. The VA publishes its privacy policy in the App Store listing.
Safety checks before installing
- Apps are adjuncts. For moderate-severe mental-health concerns, see a clinician.
- Read the App Store / Google Play privacy label before connecting any health data.
- Try the free tier for two weeks before subscribing.
- If using a therapy app, verify your therapist’s licence in your jurisdiction.
- Crisis lines are not apps. Save your local crisis number in your phone now - the numbers at the top of this article are a start.
Mental health app questions
Can mental health apps replace therapy?
No. Apps are useful adjuncts for mild symptoms, skill practice, and self-monitoring - not replacements for professional care for moderate or severe conditions. Woebot and PTSD Coach are explicitly designed as between-session supplements to professional treatment. If symptoms are significantly affecting your functioning, an app is not sufficient; a qualified clinician is the starting point.
Are mental health apps safe with my personal data?
It varies significantly by app. Daylio stores data locally by default, which is the most privacy-protective approach. Headspace and Insight Timer have fairly standard subscription-service privacy policies. BetterHelp settled an FTC case in 2023 over health-data sharing with advertisers - read their current privacy policy carefully before connecting sensitive health information. Always check the App Store privacy label before installing any health app.
What’s the difference between Headspace and Calm - which should I choose?
Both are strong meditation apps. Headspace is better for structured beginner learning - it has a more systematic curriculum and a larger published research base. Calm is better for sleep-onset - the sleep stories and the night-mode emphasis are its strongest features. If sleep is your main concern, Calm. If building a general meditation practice, Headspace. If cost is the concern, Insight Timer’s free library is substantial enough to avoid paying for either.
Is online therapy through BetterHelp or Talkspace as effective as in-person therapy?
Research suggests video-based therapy is broadly comparable in effectiveness to in-person therapy for many common presentations - anxiety, depression, relationship issues. The practical advantage is access and speed: online platforms can often match you to a therapist in days rather than weeks. The quality control concern is real on any at-scale marketplace - read your therapist’s credentials and ask about their training and approach before committing.
More health and privacy guides
- Top 10 Evidence-Backed Fitness Trends Worth Trying
- Top 10 Evidence-Backed Health Benefits of Yoga
- Top 10 Low-Cost Ways to Improve Daily Focus
Sources and care caveats
The app market for mental health is growing faster than the evidence base. Some apps with strong marketing have weak clinical support; some apps with poor marketing have surprisingly strong evidence. Treat any “wellness” claim cautiously and read the App Store privacy label before installing.
- APA on choosing a mental-health app - American Psychological Association consumer guidance.
- Mind UK on mental-health apps - UK mental-health charity reviews.
- 988 Suicide & Crisis Lifeline - US 24/7 crisis line.
- SADAG South African Depression and Anxiety Group - 0800 567 567 for ZA crisis support.
- findahelpline.com - global crisis-line directory.