What is the best OBD2 app for iPhone?

Which OBD2 apps work on iPhone, and how do they compare?

An iPhone OBD2 app can only talk to an adapter over Bluetooth Low Energy, Wi-Fi or Apple MFi, or to the app maker's own sensor. That rules out the classic Bluetooth adapters many Android apps use, which is also why Torque Pro, an Android app, is not in this comparison: see Is Torque Pro available for iPhone?

The six apps below were checked on September 28, 2026, against their US App Store page and the developer's own site. A cell reading Not listed means the developer does not advertise the feature, not that the app cannot do it. Prices are the ones the US App Store displayed that day and change often; the App Store always shows the current one.

Sources: App Store pages for Car Scanner, OBD Fusion, BlueDriver, OBD Auto Doctor and Infocar; BlueDriver store; OBD Auto Doctor pricing. Checked September 28, 2026.

Car Scanner ELM OBD2: a free scanner with manufacturer profiles

Car Scanner ELM OBD2, by Stanislav Svistunov, is free to download and rated 4.8 stars on 32,669 ratings on the US App Store. Its listing advertises readiness monitors ("Check if your car is ready for emission tests"), freeze frames, Mode 06, custom PIDs, dashboards you lay out yourself, and connection profiles for makes including Toyota, GM, Hyundai, Kia, VW and BMW. It works with Bluetooth LE or Wi-Fi ELM327 adapters and comes in 19 languages.

Car Scanner Pro is a one-time $7.99 purchase, with subscriptions from $3.99 as an alternative. Neither the App Store page nor the developer's site mentions CarPlay, an Apple Watch app, a fill-up log or maintenance reminders.

OBD Fusion: dashboards and paid packs per make

OBD Fusion, by OCTECH LLC, costs $9.99 and is rated 4.7 stars on 19,479 ratings. It reads readiness, freeze frame and Mode 06, supports more than 250 standard PIDs plus your own, logs drives with a GPS route colored by any parameter, and syncs through iCloud and Dropbox. Manufacturer modules such as ABS, airbag and transmission come as Enhanced Diagnostics packs at $14.99 per make.

On CarPlay, OBD Fusion shows "vital driving information in a list", so readings appear as text rather than gauges. It works with the Bluetooth LE adapters its page lists, or Wi-Fi ones, and states that it is not compatible with generic ELM Bluetooth scan tools.

BlueDriver: one sensor, no subscription, repair reports

BlueDriver, by Root Four Imagination, is a free app that only works with the BlueDriver sensor, sold for $99.95 (list price $119.95) on the maker's store on September 28, 2026. There is no subscription. It reads smog readiness, freeze frame and Mode 6, and includes ABS, airbag and transmission codes for makes such as GM, Ford, Chrysler, Toyota, Nissan, Mazda and Mercedes.

Its distinguishing feature is Repair Reports, fixes matched to your year, make, model and code from what BlueDriver calls "a database of millions" of real-world fixes. The app is in English only and uses a BlueDriver account rather than iCloud.

OBD Auto Doctor and Infocar: subscriptions and in-app plans

OBD Auto Doctor, by Creosys, is free to download and works with Bluetooth or Wi-Fi ELM327 adapters. Its developer's pricing page puts readiness monitors, freeze frame and Mode 06 in Premium; the App Store lists subscriptions from $4.99 to $6.99 a month and from $23.99 to $29.99 a year, including legacy tiers.

Infocar, by Infocar Co., is free with PRO at $8.99 a year or $23.99 once, and manufacturer data from $12.99 a month. It is the only other app in the table that advertises a maintenance schedule and an expense tracker, and it replays drives on a map. Its listing says it is optimized for Infocar's own adapter and that some features may be limited with third-party ones.

What do readiness, freeze frame and Mode 06 mean?

These are the columns that separate a code reader from a diagnostic app. An emissions test checks the readiness monitors, so they matter before an inspection; freeze frame explains a code; Mode 06 shows a problem before it becomes one. How to use an OBD2 scanner covers reading and clearing codes safely.

• Readiness monitors: the self-tests a car runs on its emissions systems, such as the catalytic converter or oxygen sensors. Each reads ready or not ready, and too many not ready can fail an emissions test even with no fault.
• Freeze frame: the snapshot of engine data (RPM, speed, coolant temperature, load) the car saves the moment it stores a fault, which tells you under which conditions it happened.
• Mode 06: the raw results of the car's on-board tests, with their limits. It can show a misfire count or a catalyst result creeping toward its limit before a code sets.
• Manufacturer modules: the generic OBD2 request reaches the engine and emissions side. ABS, airbag, transmission and body modules need make-specific commands, which is what OBD Fusion's packs, BlueDriver's enhanced coverage and Car Scanner's profiles add.

Which OBD2 app should you pick for your iPhone?

Pick by the job, not by the rating. Every app in the table reads and clears generic trouble codes; they differ on depth, adapter, price model and what else they keep about the car.

• Most depth on one make: OBD Fusion plus that make's $14.99 pack, or BlueDriver if you prefer one sensor, no subscription and repair reports.
• A free scanner with the widest adapter choice: Car Scanner ELM OBD2, with Bluetooth LE or Wi-Fi adapters and profiles for many makes.
• Emissions checks on a subscription: OBD Auto Doctor Premium.
• OBD data inside a car log: Infocar for maintenance and expenses, or WrenchTime for the fuel log, 56 maintenance procedures, automatic trip tracking, CarPlay gauges, Apple Watch and private iCloud sync. WrenchTime does not read Mode 06 or manufacturer modules, and needs a Bluetooth LE ELM327 adapter or the OBDLink MX+.

Is there a free OBD2 app for iPhone?

Yes. Car Scanner ELM OBD2, OBD Auto Doctor, Infocar and WrenchTime are free to download, and the BlueDriver app is free but needs its paid sensor. What the free tier includes varies, and each App Store page lists what the paid tier adds: OBD Auto Doctor's developer puts readiness, freeze frame and Mode 06 behind Premium, while WrenchTime's free tier includes 3 live gauges and puts trouble codes in Pro.

Which OBD2 apps for iPhone work without a subscription?

Five of the six advertise a one-time option: OBD Fusion at $9.99 plus optional one-time packs, BlueDriver through its sensor, Car Scanner Pro at $7.99, Infocar's Forever Plan at $23.99 and WrenchTime Pro lifetime at $34.99. OBD Auto Doctor's current tiers are subscriptions. Prices are the US App Store's on September 28, 2026.

Key takeaways: choosing an OBD2 app for iPhone

The comparison in five lines, as of September 28, 2026.

• Adapter first: an iPhone needs Bluetooth LE, Wi-Fi, MFi or the app maker's own sensor; classic Bluetooth adapters do not work.
• Emissions test: you need readiness monitors, which Car Scanner, OBD Fusion, BlueDriver, OBD Auto Doctor Premium and WrenchTime Pro all read.
• ABS and airbag codes: need manufacturer modules: OBD Fusion packs, BlueDriver's included coverage, Car Scanner's profiles or Infocar's manufacturer data.
• CarPlay: OBD Fusion shows a text list, WrenchTime shows gauges; the others do not list CarPlay.
• One-time purchase: offered by Car Scanner, OBD Fusion, BlueDriver, Infocar and WrenchTime; OBD Auto Doctor's current tiers are subscriptions.

WrenchTime: OBD2 data next to your fuel and service log

With a Bluetooth LE ELM327 adapter or the Apple MFi OBDLink MX+, WrenchTime reads live data (RPM, speed, load, temperatures, fuel rate), records it with every trip and shows it as gauges on CarPlay. With WrenchTime Pro it reads stored, pending and permanent trouble codes, the readiness monitors and the freeze frame, and saves each scan with its date and odometer reading; generic codes get a plain-language description in your language. It does not read Mode 06 or manufacturer modules.

Download WrenchTime on the App Store and try every OBD screen in the free demo mode before buying an adapter. The OBD2 app for iPhone guide lists the adapters that work and everything the app reads.