Comparison

Stardater vs OpenOBD

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

Head to head
About

Stardater

Features
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What if time had a number that was uniquely yours? Stardate reimagines how you experience time by anchoring it to the most meaningful moment in your personal history: your birth. Enter your date of birth once, and the app calculates your personal stardate — a living number that reflects exactly where you are in your own journey through time. Your Personal Stardate Your stardate has three parts: the year of your life you're currently living, the day of that this year, and the percentage of today that has already passed. At 6:34pm on the 88th day of your 57th year, your stardate is 57088.77. It's a clock, a calendar, and a life odometer — all in one elegant number. More Than Just a Number Stardate also shows you how many days you've been alive, what percentage of your life this year represents, and what infinitesimally small slice of your entire life this single day accounts for. These aren't just statistics — they're perspective. The kind that makes you put down your phone and actually do something with your afternoon. Apple Watch Stardate includes a full Apple Watch app and complication so your personal time is always on your wrist. The complication displays the current percentage of your day — a quiet, constant reminder that time is moving. Stardate is for anyone who has ever felt that the conventional calendar is someone else's way of keeping score.

About

OpenOBD

Transform your iPhone into a real-time car dashboard. Connect an OBD2 adapter to monitor live engine data, track your trips with GPS, and diagnose fault codes with clear explanations. Explore all features in demo mode without hardware.

Highlights
  • Live engine data monitoring
  • Real-time speed, RPM, temperature gauges
  • Trip logging with GPS mapping
  • Read and clear diagnostic trouble codes (DTCs)
  • Vehicle information display
  • Demo mode for exploration
Features
Read full description

OpenOBD turns your iPhone into a real-time car dashboard. Connect any ELM327 OBD2 adapter (Bluetooth or Wi-Fi) and see what your car is really doing — live. LIVE ENGINE DATA • Speed, RPM, coolant temperature, intake, throttle, engine load, battery voltage and more • Clean, fast gauges that update in real time • Instant and average fuel consumption TRIP LOGGING • Automatically record your drives with the GPS route on a map • Keeps recording in the background, even with the screen locked • Review distance, duration, speed and fuel for every trip DIAGNOSTICS • Read and clear fault codes (DTCs) with plain-language explanations • Check-engine (MIL) status and stored trouble codes • Vehicle info: VIN, fuel type, supported sensors BUILT FOR DRIVERS • Beautiful dark interface designed for the car • Works with affordable ELM327 adapters — no subscription, no account TRY IT WITHOUT HARDWARE • Tap Connect, then Demo Mode, to explore every feature with simulated live data OpenOBD is not affiliated with any car manufacturer. An OBD2 adapter (sold separately) is required to read data from your vehicle. Most petrol cars built after 2001 and diesels after 2004 are supported.

Screenshots

Stardater2 screens
OpenOBD4 screens

Verdict

The call

The clearest difference is price: OpenOBD at Free against Stardater's $1.99. OpenOBD also leads on update cadence (every 2 days vs every 3 weeks) and iOS requirement (16.4 vs 26.1). On ads, in-app purchases 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

OpenOBD is free to download; Stardater costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Stardater ships an update every 3 weeks, OpenOBD every 2 days. The most recent releases landed on October 6, 2026 and October 13, 2026 respectively.

Scorecard3 real differences · 7 level
Stardater versus OpenOBD: the parameters behind the verdict, then further details
ParameterStardaterOpenOBD
Price$1.99Free — better
Rating—4.0 (1 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—1 — better
Update frequencyEvery 3 weeksEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPad
Requires iOS26.116.4 — better
Further details — not scored
Size3 MB36 MB
Age rating4+4+
DeveloperPaul SchmaldinstOsman Cengeri

In-app purchases

None

Stardater

No in-app purchases

None

OpenOBD

No in-app purchases

Questions

Is Stardater free?
Stardater costs $1.99, with no in-app purchases.
Is OpenOBD free?
OpenOBD is free to download, with no in-app purchases.
Do Stardater or OpenOBD have ads?
Neither Stardater nor OpenOBD shows ads.
Which is updated more often, Stardater or OpenOBD?
Stardater ships an update every 3 weeks, and OpenOBD every 2 days. Most recently, Stardater was updated on October 6, 2026 and OpenOBD on October 13, 2026.

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