Comparison

Roulez éveillé vs LyteFast

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

Head to head
About

Roulez éveillé

Assess your alertness before driving with a quick reaction time test. Receive personalized advice on rest and fatigue management, and access guided relaxation sessions to ensure safe journeys.

Highlights
  • Reaction time test
  • Alertness assessment
  • Fatigue management advice
  • Guided relaxation sessions
  • Test history tracking
  • Social sharing
Features
Read full description

Avant de conduire, faites le test. Roulez éveillé ! 

Roulez éveillé est une application gratuite proposée par la Fondation d’entreprise VINCI Autoroutes, qui permet aux conducteurs de tester leur niveau d’éveil avant de prendre le volant. Ce test simple et rapide repose sur la mesure du temps de réaction à l’apparition de stimuli visuels.

 Une fois le test réalisé, et en fonction de son résultat, l’utilisateur accède à des fiches conseils élaborées en partenariat avec l’Institut national du sommeil et de la vigilance (INSV) sur les bonnes pratiques pour favoriser un repos efficace avant et pendant son trajet. L’application propose également des informations sur les dangers de la somnolence et de la fatigue au volant.

 Grâce à l’historique de ses tests, l’utilisateur peut identifier les périodes où son niveau d’éveil n’est pas satisfaisant. L’application s’avère alors utile dans la programmation de son voyage en voiture. Elle embarque enfin un module audio permettant à l’utilisateur de bénéficier d’une séance de relaxation guidée par une sophrologue afin de l’aider à se détendre pendant sa pause. 

Le test du niveau d’éveil a été élaboré et expérimenté dans le cadre d’une étude scientifique réalisée par le Centre d’Investigations Neurocognitives et Neurophysiologiques (Ci2N) de l’Université de Strasbourg.


 Il est possible de participer à cette étude sur la somnolence en transmettant de façon anonyme ses données des tests au Ci2N de Strasbourg. Enfin l’application permet le partage sur les réseaux sociaux. Déroulement du test

 : - Lorsque le stimulus visuel apparaît, l’utilisateur doit appuyer le plus rapidement possible n’importe où sur l’écran.
 - Les stimuli se succèdent à des intervalles définis de manière aléatoire, pendant une durée de 30 secondes. - Le programme enregistre l’ensemble des temps de réaction de l’utilisateur et les compare à son temps de réaction de référence, préalablement établi à travers un 1er test (niveau de référence). 

- Si la moyenne des temps de réaction, mais également leur variabilité, sont significativement différentes du niveau de référence, l’utilisateur est averti de son état potentiel de fatigue ou de somnolence.

About

LyteFast

Features
Read full description

Log your weight for free, sync your scale and fitness tracker, and see where you're heading. Core logging is free; the weight forecast, AI Muscle Rating, AI Body Preview and other premium features require a subscription (see below). NEW: AI Body Preview (requires AI Add-On subscription) Pick a photo and the AI generates a goal-physique visualization to help you imagine where your efforts could lead. Share the before/after to Instagram or TikTok. Results are AI-generated artistic renderings for motivational purposes only — not predictions, clinical assessments, or representations of your actual future appearance. NEW: AI Muscle Rating (requires AI Add-On subscription) Snap a photo and get an instant 1-100 score for each of 8 muscle groups (pectorals, shoulders, biceps, triceps, forearms, legs, abs, back), plus an overall rating and a gamified rank — Wood, Bronze, Silver, Gold, Platinum, Diamond, Champion, Titan, Olympian. See where you stand on the bell curve, get a comment per muscle, and share your card. Scores are AI-generated estimates, not clinical measurements. What also makes LyteFast different Auto-Zoom chart that focuses on the most relevant slice of your journey, smooths daily noise, and projects a near-term weight forecast (subscription required): Am I on track? When is the next milestone? Budget-based calories — subscription required (simple "spend vs. budget"): - AI Food Scanner recognizes common foods and portions (requires AI Add-On subscription). - Barcode Scanner pulls verified nutrition for packaged items (requires AI Add-On subscription). - Instant budget status (on/near/over) plus remaining calories and friendly guidance. Fasting, made actionable (subscription required) Log fasting windows and see their measurable impact. An animated %-to-goal gauge shows where you stand, and the Auto-Zoom chart shows where you're headed. Sustainability & sensitivities (subscription required) Each meal scan includes estimated CO₂e (carbon footprint) so you can see environmental impact over days and weeks. Packaged items can display a gluten status indicator for quick screening. Insights inform—never judge. Always know what to do next (subscription required) A clear, always-visible calorie deficit view translates energy balance into plain language: how far you are from goal, what's driving the current trend (intake, activity, fasting), and the smallest effective changes to close the gap. On-budget notifications help you course-correct early. Syncs when you do—works even if you don't Fitness tracker & scale sync: steps, workouts, and weigh-ins automatically. No tracker? Manual entry. Choose from 60 activity types to estimate calories burned. Fast logging without scanning Use the Calorie Estimator with 60 predefined foods to compute intake quickly. Each item includes a simple carbon-footprint range (low / medium / high) and gluten status. What's free vs. subscription Free: manual weight and step logging, calorie estimator, fitness tracker & scale sync, basic charts. Base Access subscription: weight forecast, calorie deficit tracking, fasting log & insights, CO₂e footprint, gluten status indicator. AI Add-On subscription: AI Food Scanner, Barcode Scanner, AI Body Preview, AI Muscle Rating. Subscriptions are available as weekly, monthly, or yearly plans and are managed through your Apple ID. Payment is charged to your Apple ID account at confirmation of purchase. Subscriptions automatically renew unless cancelled at least 24 hours before the end of the current period. You can manage or cancel subscriptions in your Apple ID account settings at any time. All features are estimates and do not replace medical, nutritional, or fitness advice. AI Body Preview generates artistic visualizations for motivational purposes only — not predictions and not representations of your actual future appearance. AI Muscle Rating scores are AI-generated estimates, not clinical measurements.

Screenshots

Roulez éveillé4 screens
LyteFast4 screens

Verdict

The call

The clearest difference is in-app purchases: Roulez éveillé at none against LyteFast's 6. Roulez éveillé also leads on iOS requirement (9.0 vs 18.0). LyteFast's advantage is update cadence (every 2 months vs every 12 months). On price, ads and device support 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

Both are free to download. LyteFast sells 6 in-app purchases, starting at $0.99 per 7 days. Roulez éveillé asks for nothing beyond the download.

UpkeepUpdate frequency

Roulez éveillé ships an update every 12 months, LyteFast every 2 months. Both last shipped on October 24, 2026.

Scorecard3 real differences · 5 level
Roulez éveillé versus LyteFast: the parameters behind the verdict, then further details
ParameterRoulez éveilléLyteFast
PriceFreeFree
Positive reviews37.8% of reviews—
Update frequencyEvery 12 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad, Apple Watch — better
Requires iOS9.0 — better18.0
Further details — not scored
Size48 MB68 MB
Age rating4+4+
DeveloperVINCI.AutoroutesStephane Sprauer

In-app purchases

None

Roulez éveillé

No in-app purchases

6 purchases

LyteFast

Subscriptions6
  • Weekly premium access3 Days trial$0.997 Days
  • Monthly premium access$2.991 Month
  • Weekly LyteFast AI Add-On$4.997 Days
Show 3 more
  • Monthly LyteFast AI Add-On$14.991 Month
  • Yearly premium access$23.991 Year
  • Yearly LyteFast AI Add-On$149.991 Year

Questions

Is Roulez éveillé free?
Roulez éveillé is free to download, with no in-app purchases.
Is LyteFast free?
LyteFast is free to download, with in-app purchases available.
Do Roulez éveillé or LyteFast have ads?
Neither Roulez éveillé nor LyteFast shows ads.
Which is updated more often, Roulez éveillé or LyteFast?
Roulez éveillé ships an update every 12 months, and LyteFast every 2 months. Most recently, Roulez éveillé was updated on October 24, 2026 and LyteFast on October 24, 2026.

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