Comparison

Key for Tesla vs SundialEV

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

Head to head
About

Key for Tesla

Control your Tesla vehicle directly from your Apple Watch or iPhone. Unlock, lock, start, and manage climate settings with a single tap or voice command. Monitor battery status and charging progress conveniently.

Highlights
  • Unlock and start Tesla with one tap
  • Lock car with a tap
  • Today extension for quick access
  • Siri support for commands
  • Apple Watch climate control
  • Check battery status and charging
  • Watch Complications for quick info
Features
Read full description

Key for Tesla allows you to forget about your key and leave it at home. If you feel like you want to impress your friends try the Siri extension on the Apple Watch or iPhone! Note: Supported vehicles: pre 2021 S/X This app focus on Apple Watch functionality and Siri. Features on iPhone: 1) Unlock and start your Tesla with one tap using the Touch ID or Face ID 2) Lock the car just by tapping the lock button 3) A convenient Today extension. You can unlock and start your Tesla in less than 5 seconds 4) Siri support 5) Additional Siri Shortcuts for common commands 6) Login with password auto fill Features on Apple Watch: 1) Open and close the car 2) Start and Stop the climate 3) Check your battery status, range, charging power, added energy, added range and time remaining to complete charging 4) Watch Complication to check battery level (updates every 30 minutes and pauses between 00:00 and 08:00, can be configured in the iPhone app) 5) Watch Complication to Start and Stop the climate. 6) Watch Complication to Start and Stop max defrost. 7) Siri support 8) Additional Siri Shortcuts for common commands Siri commands: Lock my car Unlock my car Is my car locked? Additional Siri Shortcuts: Start and Stop Climate Start and Stop Max defrost Vent and Close roof Open and Close Rear Lift-gate with and without confirmation Open Frunk Open Charge Port Lock and Unlock without confirmation The original Tesla iPhone App takes you 2 taps and a loading to unlock and start. This app is just one tap away for the same functionality. Note: This app stores your authentication token and your password, if given, using iOS secure Keychain. The app uses Tesla's MFA authentication to create an access token. You will be redirected to Tesla's page to authenticate. The app never has access to your credentials. Supported devices: iPhone 5S or newer with Touch ID, iPhone X and newer with Face ID. Apple Watches 2 and above Supported vehicles: pre 2021 S/X model 3/Y and 2021+ S/X support are not supported but it might come in the future

About

SundialEV

This app intelligently directs surplus solar energy to charge your electric vehicle instead of sending it back to the grid. It helps users save money by avoiding high electricity buy-back rates and utilizing cheaper off-peak charging times. The system is designed for a set-and-forget experience, integrating with existing EV and solar hardware.

Highlights
  • Charges EV with surplus solar
  • Avoids grid export for low rates
  • Set charging floor and battery reserve
  • Works with all Tesla models
  • Coordinates with Powerwall
  • Utilizes off-peak charging
Features
Read full description

Your rooftop solar is worth far more in your car than sold back to the grid. SundialEV automatically charges your EV from surplus solar instead of exporting it for pennies — set it once and forget it. Under "Net billing" electric plans (like NEM 3.0), utilities pay you a few cents for the solar you export, then charge you full price for the same energy at night. Sundial closes that gap: when your panels make more than your home needs, it sends the surplus to your car instead of the grid, saving most users on their electricity bills. • Set-and-forget — pick a charging floor and a battery reserve once; Sundial does the rest • Works with every Tesla model — and with any EV brand via an OCPP smart wall charger, like the Wallbox Pulsar Plus • Reads your production from Tesla, SolarEdge, Enphase solar systems (+ more now) • Coordinates with your Powerwall — you choose how full it gets before the car charges • Tops up on cheap off-peak power on your schedule, and avoids peak-rate windows when solar isn't available • Need range right now? One tap starts a full-speed charge — solar takes back over when it's done • No new hardware — works with the solar, battery, car, and charger you already own

Screenshots

Key for Tesla3 screens
SundialEV4 screens

Verdict

The call

The clearest difference is price: SundialEV at Free against Key for Tesla's $1.99. SundialEV also leads on review sentiment (100% vs 55%) and rating (5.0 vs 2.9). Key for Tesla's advantage is device support (3 vs 1). On ratings volume, ads, in-app purchases 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

SundialEV is free to download; Key for Tesla costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

SundialEV holds the better App Store score, 5.0 against 2.9. Both are backed by a comparable volume of ratings — 14 and 11 respectively. Written reviews point the same way: 55% of Key for Tesla's written reviews are positive against 100% of SundialEV's.

UpkeepUpdate frequency

Key for Tesla ships an update every 5 weeks, SundialEV every 6 days. Both last shipped on October 24, 2026.

Scorecard6 real differences · 4 level
Key for Tesla versus SundialEV: the parameters behind the verdict, then further details
ParameterKey for TeslaSundialEV
Price$1.99Free — better
Rating2.9 (14 ratings)5.0 (11 ratings) — better
Positive reviews55.0% of reviews100.0% of reviews — better
Number of ratings14 — better11
Update frequencyEvery 5 weeksEvery 6 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPod, Apple Watch — betteriPhone
Requires iOS15.0 — better16.4
Further details — not scored
Size10 MB42 MB
Age rating4+4+
DeveloperJoao NunesAppAhead

Customer experience

Key for Tesla

All ratings13 ratings
Positive53.8%
Neutral0.0%
Negative46.2%
Written reviews20 reviews
Positive55.0%
Neutral0.0%
Negative45.0%

SundialEV

All ratings11 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews6 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Key for Tesla

No in-app purchases

None

SundialEV

No in-app purchases

Questions

Is Key for Tesla free?
Key for Tesla costs $1.99, with no in-app purchases.
Is SundialEV free?
SundialEV is free to download, with no in-app purchases.
Which has better reviews, Key for Tesla or SundialEV?
SundialEV is rated higher. Key for Tesla averages 2.9 out of 5 from 14 ratings, while SundialEV averages 5.0 from 11 ratings.
Do Key for Tesla or SundialEV have ads?
Neither Key for Tesla nor SundialEV shows ads.
Which is updated more often, Key for Tesla or SundialEV?
Key for Tesla ships an update every 5 weeks, and SundialEV every 6 days. Most recently, Key for Tesla was updated on October 24, 2026 and SundialEV on October 24, 2026.

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