Comparison

ThunDroid AI vs EYEON

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ThunDroid AI

This app offers AI-powered mental wellness support, integrating CBT, DBT, and ACT therapy frameworks. It features guided breathing exercises, an intelligent journal, and a live voice mode for real-time interaction, all designed to help manage stress and emotions.

Highlights
  • AI-powered CBT, DBT, ACT therapy frameworks
  • Stanford-validated cyclic sighing stress reset
  • 13 guided breathing techniques
  • Live voice mode for AI interaction
  • Intelligent journal with 15 templates
  • On-device AES-256 encryption for privacy
Features
Read full description

ThunDroid AI is your personal intelligence. It is an AI companion for feelings and ordinary days: talk when you need someone, write when you need to see a pattern, and breathe when your body is ahead of you. TALK Speak in Live Voice, or type. ThunDroid draws on CBT, DBT, and ACT, three approaches used in therapy, and stays with what you have already said. It is a companion for the moments between sessions. It does not replace a clinician. JOURNAL Fifteen guided templates, including a CBT thought record, a DBT diary card, gratitude, sleep, and goals, plus mood, streaks, and history. Journal entries are encrypted on your device with AES-256-GCM. BREATHE Thirteen guided techniques, including cyclic sighing, the exercise a Stanford study found reduced anxiety faster than mindfulness meditation, plus box breathing, 4-7-8, resonance, alternate nostril, and the Wim Hof method. Visual guides and haptic cues. Breathing works offline. PRIVACY Chat is sent over a secure connection to ThunDroid’s servers so the companion can respond. Your journal is different: it stays on your device, protected with AES-256-GCM. ThunDroid does not sell your journal or your conversations. Start with 3 days free. Full access. Cancel anytime. Privacy Policy: https://aetherrax.com/privacy-policy-aetherrax-technologies/ Terms of Use: https://aetherrax.com/terms-of-service-aetherrax-technologies/

About

EYEON

Features
Read full description

WHO IT IS FOR: EYEON is for people who have had cataract surgery and wonder what to do next. It is also for anyone who wants gentle, structured exercises for their eyes. WHY EYEON EXISTS: The founder, Tomáš, had cataract surgery. He could see, but nobody told him what came next or whether eyes can be trained at all. So he started reading scientific studies. He found research on perceptual learning: the brain can be trained to process what the eye sees better, including contrast, tracking and peripheral vision. He built the app on those studies, first just for himself. Now he shares it with you. WHAT THE STUDIES FOUND: • Polat et al. (2004, PNAS): adults with amblyopia who trained with contrast patterns roughly doubled their contrast sensitivity. • Deveau, Ozer & Seitz (2014, Current Biology): UC Riverside baseball players improved visual acuity by 31% on average after 30 training sessions, some reaching 20/7.5. • Kaymak et al. (2008): in 16 patients with multifocal intraocular lenses, the trained eye improved faster, and the difference lasted 6 months. • OPTIcTRAIN (Piñero et al., 2023): randomized trial, 60 patients with trifocal lenses, 20 sessions of 30 minutes. Contrast sensitivity improved compared with placebo; acuity was unchanged. Participants were adults with amblyopia, athletes and patients with lens implants. The results describe those groups. HOW THE EXERCISES FOLLOW THE STUDIES: The exercises in EYEON stand on the same principles. Contrast Training uses faint patterns and adapts its difficulty to you, as in the contrast studies. Convergence Training draws on the same idea as the CITT trial, where 73% of children aged 9 to 17 with convergence insufficiency were successful or improved with office-based therapy. THREE TRAINING MODES: HEALTHY EYES: A balanced routine of eye-movement, contrast, focus and attention exercises. POST-CATARACT: A structured routine of gentle exercises to practise alongside your regular care. Always follow your surgeon's instructions. FLOATERS: Gentle guided eye movements. EYEON does not remove floaters. New floaters or flashes of light need an eye doctor's attention. 13 EXERCISES: Moving Point, Contrast Training, Saccadic Exercise, Peripheral Reaction, Near-Far Focus, Convergence Training, Pattern Memory, Relaxation, Floater Eye Movement. NEW IN 1.6: Go/No-Go, Hand-Eye Coordination, Color Discrimination, Visual Crowding. SYMPTOM DIARY AND PDF REPORT FOR YOUR EYE DOCTOR: Rate everyday eye symptoms and answer a short yes/no check-in about warning signs. The check-in is informational only and always points you to an eye professional. Turn your diary and training statistics into a PDF and share it only if you choose to, through the system share sheet. KEY FEATURES: • Difficulty adapts to your performance • Eye comfort rating after each session • Private: all data stays on your device • Personal insights on your training, calculated on your device • No account, no tracking, no ads IMPORTANT NOTICE: EYEON is an exercise and self-tracking tool. It is not a medical device, it does not replace an eye exam, and it does not promise any improvement in your vision. The improvements described above belong to study participants. If you see double or feel discomfort, stop exercising. If you have eye pain, new floaters, flashes of light, a curtain over your vision or a sudden change in vision, contact an eye doctor immediately.

Screenshots

ThunDroid AI4 screens
EYEON4 screens

Verdict

The call

The clearest difference is price: ThunDroid AI at Free against EYEON's $8.99. EYEON's advantage is in-app purchases (none vs 1) and update cadence (every 6 days vs every 2 weeks). On ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

ThunDroid AI is free to download; EYEON costs $8.99 up front. ThunDroid AI sells 1 in-app purchase, starting at $12.99 per month. EYEON asks for nothing beyond the download.

UpkeepUpdate frequency

ThunDroid AI ships an update every 2 weeks, EYEON every 6 days. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

Scorecard3 real differences · 6 level
ThunDroid AI versus EYEON: the parameters behind the verdict, then further details
ParameterThunDroid AIEYEON
PriceFree — better$8.99
Rating1.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 2 weeksEvery 6 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhoneiPhone, iPad — better
Requires iOS17.6 — better18.2
Further details — not scored
Size32 MB5 MB
Age rating17+12+
DeveloperAetherrax TechnologiesTomas Pflanzer

In-app purchases

1 purchases

ThunDroid AI

Subscriptions1
  • ThunDroid Membership3 Days trial$12.991 Month
None

EYEON

No in-app purchases

Questions

Is ThunDroid AI free?
ThunDroid AI is free to download, with in-app purchases available.
Is EYEON free?
EYEON costs $8.99, with no in-app purchases.
Do ThunDroid AI or EYEON have ads?
Neither ThunDroid AI nor EYEON shows ads.
Which is updated more often, ThunDroid AI or EYEON?
ThunDroid AI ships an update every 2 weeks, and EYEON every 6 days. Most recently, ThunDroid AI was updated on October 28, 2026 and EYEON on October 25, 2026.

Other comparisons