Comparison

T4U for Tesla vs Impôts

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

Head to head
About

T4U for Tesla

Track and monitor your Tesla vehicle in real-time. View battery range, efficiency, and statistics by trip or period. Access a global map of charging points and participate in eco-driving challenges.

Highlights
  • Real-time consumption and range indicators
  • Vehicle statistics by trip or period
  • Schedule controls panel
  • Global charging point map
  • Eco-driver challenges
  • In-car browser access
Features
Read full description

Finally know the real condition of your Tesla's battery. Not the charge percentage. Not a figure inferred from displayed range. State of Health — how much capacity your pack has left compared to the day it left the factory. T4U is built by MyBatteryHealth, Europe's reference network for electric vehicle battery diagnostics. Over 70,000 batteries certified. MEASURED, NOT ESTIMATED Your car continuously reports the energy actually left in its pack. T4U reads that figure and derives your battery health from it. The vehicle's own computer does the measuring; we only translate. This works with the car parked and locked. You get a fresh reading every day without anything ever disturbing your vehicle. WHAT YOU GET - State of Health as a percentage, with an MBH grade from A to E - Current pack capacity in kWh, against its original capacity - Real-world range, calculated from your own data - Twelve-month degradation curve - Manufacturer warranty tracking: years, mileage, minimum State of Health - Battery chemistry, cell supplier, recommended charge limits - Maximum charging power and Supercharger compatibility - Live charge level, range and lock status - Home screen widget, current even while the car sleeps ADVANCED PACK DIAGNOSTICS Where a consumer app stops at a percentage, T4U goes down to cell level: - Voltage spread between the highest and lowest brick groups — the indicator that degrades before you lose any range - Thermal spread between modules, and the position of the hottest sensor - Internal pack resistance, measured while driving - Open-circuit voltage, and voltage per cell - Real cycle count, derived from lifetime energy consumed Each of these identifies a weak point by its number inside the pack. That is what lets you document a fault with a professional. YOUR BATTERY CARD Generate your score and share it. A social-ready card carrying your grade, your battery health, your mileage and the MyBatteryHealth certification. THE OFFICIAL MBH REPORT Issue a digitally signed battery health certificate, verifiable by QR code. A document recognised by automotive professionals, leasing companies and used car buyers — and the strongest argument you have when defending your Tesla's price at resale. WHAT T4U DOES NOT DO T4U has no permission to command your vehicle, and never asks for one. It will not wake it, unlock it or move it. No location data is collected. Distance is reconstructed from the odometer. Every figure on screen states where it came from and when it was measured. A number you cannot explain is worth nothing. T4U PREMIUM The subscription unlocks full cell-level diagnostics, weak point localisation inside the pack, twelve months of history, driving performance and unlimited sharing of your battery card. €1.99 per month or €14.99 per year. Terms of use: https://tesla-4u.com/en/privacy-legal/ Privacy policy: https://tesla-4u.com/en/rgpd/ T4U is an independent app published by VIA SAS. It is not affiliated with, endorsed by or sponsored by Tesla, Inc. Tesla, Model S, Model 3, Model X and Model Y are trademarks of Tesla, Inc.

About

Impôts

Easily calculate your income tax with this application. Input your net taxable income, and it will compute your total tax liability and breakdown for each tax bracket. The simulator uses tax brackets set by the Ministry of Economy.

Highlights
  • Calculate income tax
  • Tax bracket breakdown
  • Based on Ministry of Economy data
  • Simulates tax liability
Features
Read full description

Grâce à l'application Impôts, calculez facilement votre impôt sur le revenu. Saisissez votre revenu net imposable et nous calculons votre impôt sur le revenu total et pour chaque tranche imposable. Le simulateur d'impôt sur le revenu est basé sur les tranches d'imposition fixées par le Ministère de l'Économie. Cette application n'est pas une application officielle et les chiffres ne sont qu'à titre indicatifs.

Screenshots

T4U for Tesla4 screens
Impôts3 screens

Verdict

The call

The clearest difference is in-app purchases: Impôts at none against T4U for Tesla's 3. Impôts also leads on iOS requirement (11.0 vs 17.7). T4U for Tesla's advantage is update cadence (every 4 days vs every 4 months). On price, review sentiment, ads and monetization model 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. T4U for Tesla sells 3 in-app purchases, starting at $3.99 per month. Impôts asks for nothing beyond the download.

UpkeepUpdate frequency

T4U for Tesla ships an update every 4 days, Impôts every 4 months. Both last shipped on October 24, 2026.

Scorecard3 real differences · 5 level
T4U for Tesla versus Impôts: the parameters behind the verdict, then further details
ParameterT4U for TeslaImpôts
PriceFreeFree
Positive reviews43.5% of reviews50.0% of reviews — better
Update frequencyEvery 4 days — betterEvery 4 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.711.0 — better
Further details — not scored
Size4 MB14 MB
Age rating4+4+
DeveloperVIA - Vehicle Information applicationJulien Kermarec

Customer experience

T4U for Tesla

Written reviews85 reviews
Positive43.5%
Neutral14.1%
Negative42.4%

Impôts

Written reviews6 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

3 purchases

T4U for Tesla

Subscriptions2
  • abonnement mensuel$3.991 Month
  • abonnement annuel$39.991 Year
One-time1
  • Rapport MBH T4U$22.99
None

Impôts

No in-app purchases

Questions

Is T4U for Tesla free?
T4U for Tesla is free to download, with in-app purchases available.
Is Impôts free?
Impôts is free to download, with no in-app purchases.
Do T4U for Tesla or Impôts have ads?
Neither T4U for Tesla nor Impôts shows ads.
Which is updated more often, T4U for Tesla or Impôts?
T4U for Tesla ships an update every 4 days, and Impôts every 4 months. Most recently, T4U for Tesla was updated on October 24, 2026 and Impôts on October 24, 2026.

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