Comparison

BlueDriver OBD2 Scan Tool vs SLO/SLA Calc

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

Head to head
About

BlueDriver OBD2 Scan Tool

This app turns your smartphone into a powerful OBD2 scan tool. It allows you to read and clear trouble codes, view live data, and generate detailed repair reports for your vehicle. Understand your car's issues and make informed repair decisions.

Highlights
  • Read and clear trouble codes (Check Engine, ABS, etc.)
  • Generate professional-grade Repair Reports
  • Access Mode 6 and smog readiness data
  • View live data with interactive graphing
  • Wireless Bluetooth scanning
  • Likely fixes explained in plain language
Read full description

BlueDriver® transforms your iPhone or iPad into a powerful OBD2 scan tool – trusted by over 1 million drivers, from professional mechanics to DIYers. Paired with the BlueDriver Bluetooth® Sensor (sold separately), it lets you read codes, diagnose issues, and fix your car with confidence—no wires, no guesswork. Whether you're checking a check engine light, running a smog test, or diving into enhanced diagnostics like ABS or transmission codes, BlueDriver gives you the tools you need to understand your vehicle and make smarter repair decisions – with clear, easy-to-understand information. What You Can Do with BlueDriver · Read and clear trouble codes - including check engine, ABS, airbag, transmission, and more · Generate, save, and share professional-grade Repair Reports based on your exact vehicle and trouble code · Access Mode 6 on-board monitoring test results · Check smog readiness and freeze frame data · View live data with multi-PID interactive graphing · Scan your vehicle wirelessly with Bluetooth—no cables required · Choose between metric and imperial settings · Get likely fixes for your vehicle’s issues, explained in plain language Enhanced Diagnostics Coverage · GM, Ford, Chrysler, Toyota, Nissan, Mazda, Mercedes (2005+ models) · Mitsubishi (2008+), Hyundai/Kia (2012+) – available worldwide · BMW/Mini, Honda/Acura, Volkswagen/Audi – available in North America · Subaru – available in the United States What Makes BlueDriver Different? · No subscription required · Backed by a database of millions real-world fixes · Repair Reports are specific to your vehicle’s year, make, and model · Works globally with the BlueDriver Sensor · App is free to install—just pair with the Sensor to start scanning You can even preview a Repair Report without a Sensor by entering your VIN and a trouble code. Account Setup Made Easy You’ll create a BlueDriver account during setup—it’s quick and easy, and gives you secure access to all your scans, reports, and new features across any device. Important Info The BlueDriver Sensor plugs into your vehicle’s data port (found in every car built since 1996). It connects to the app via Bluetooth® to deliver full diagnostic functionality. Sensor sold separately in-app or at www.BlueDriver.com

About

SLO/SLA Calc

This tool helps engineers and operators model system availability and evaluate designs before deployment. It calculates availability for various configurations, estimates device reliability, and allows users to build and visualize complex systems. Generate professional PDF reports and review key definitions for availability and reliability.

Highlights
  • Calculate system and device availability
  • Model series, parallel, and N:M designs
  • Estimate device availability using MTBF, MTTR
  • Save and reuse devices/subsystems as Blocks
  • Build larger Systems by connecting Blocks
  • Visualize system architecture
  • Generate and share PDF reports
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SLO/SLA Calc helps engineers, architects, SREs, and operators move from Device assumptions to resilient System decisions before deployment. Model operational availability and time-bound Mission Reliability. Calculate Series, Parallel, N:M, and Cross-Connected topologies. Estimate Device Availability from manufacturer MTBF or documented generic estimates, then account for repair time, spare logistics, support agreements, EOL sourcing, and redundant power. Review exactly how each assumption affects the result. Save Devices and subsystems as reusable Blocks, then arrange them into larger Systems. With Live Modeling, apply temporary failures to Blocks, internal Components, and switches. Remaining Availability updates immediately while animated Red and Blue paths show which inputs survive. Shared paths become Purple, and optional output switches select a healthy single handoff. MODEL AVAILABILITY - Calculate System and Device Availability - Review a transparent Device calculation breakdown - Edit the defaults used for new Device calculations - Translate availability into downtime per day, week, month, or year - Model Series, Parallel, heterogeneous N:M, and Cross-Connected designs - Reuse saved Devices as named topology Components EVALUATE A MISSION - Estimate Mission Reliability for a defined duration in hours, days, or weeks - Use stored MTBF or an explicit availability-only assumption - Compare Mission Success, Interruption Risk, and any-Component failure probability - See expected failed Components and the weakest individual contributor - Distinguish provided, estimated, assumption-based, and mixed data BUILD AND TEST SYSTEMS - Assemble Systems from reusable Blocks and ordered Stages - Use Direct or Full Cross multi-path Handoffs - Add optional output switches and explicit Ideal Paths - Simulate Block, Component, and switch failures - Trace surviving flows in portrait or full-screen landscape COMPARE AND SHARE - Compare complete Systems and quantify downtime reduction - Evaluate a design against a target SLO - See remaining or exceeded error budget - Generate and share professional PDF reports - Export, share, preview, and import editable JSON-based .slosla files - Edit imported Block Components and recalculate the design Learn through an expanded Guided Tour, worked examples, formulas, model assumptions, and practical design guidance. SLO/SLA Calc works entirely offline and stores Device defaults, Blocks, and Systems locally on your device. No account is required. Files leave your device only when you choose to export or share them. One purchase unlocks the complete app. No ads, analytics, tracking, subscriptions, or in-app purchases.

Screenshots

BlueDriver OBD2 Scan Tool4 screens
SLO/SLA Calc4 screens

Verdict

The call

The clearest difference is price: BlueDriver OBD2 Scan Tool at Free against SLO/SLA Calc's $1.99. BlueDriver OBD2 Scan Tool also leads on ratings volume (14K vs 1). SLO/SLA Calc's advantage is review sentiment (100% vs 58%) and rating (5.0 vs 4.6). On update cadence, 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

BlueDriver OBD2 Scan Tool is free to download; SLO/SLA Calc costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

SLO/SLA Calc holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: BlueDriver OBD2 Scan Tool has 14K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 58% of BlueDriver OBD2 Scan Tool's written reviews are positive against 100% of SLO/SLA Calc's.

UpkeepUpdate frequency

BlueDriver OBD2 Scan Tool ships an update fortnightly, SLO/SLA Calc every 11 days. The most recent releases landed on November 8, 2026 and October 31, 2026 respectively.

Scorecard5 real differences · 5 level
BlueDriver OBD2 Scan Tool versus SLO/SLA Calc: the parameters behind the verdict, then further details
ParameterBlueDriver OBD2 Scan ToolSLO/SLA Calc
PriceFree — better$1.99
Rating4.6 (14K ratings)5.0 (1 ratings) — better
Positive reviews58.5% of reviews100.0% of reviews — better
Number of ratings14K — better1
Update frequencyFortnightlyEvery 11 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.6 — better17.0
Further details — not scored
Size273 MB5 MB
Age rating4+4+
DeveloperLemur Vehicle MonitorsRuben Calzadilla

Customer experience

BlueDriver OBD2 Scan Tool

All ratings13,728 ratings
Positive90.7%
Neutral2.2%
Negative7.1%
Written reviews930 reviews
Positive58.5%
Neutral5.5%
Negative36.0%

SLO/SLA Calc

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

BlueDriver OBD2 Scan Tool

Reported bugs

3 issues
  • Occasional app crashes
  • Failure to detect vehicle faults in some cases
  • Inability to update firmware on certain devices

Requested features

10 requests
  • Add support for more vehicle makes and models
  • Improve Bluetooth stability and connectivity
  • Implement odometer reading functionality
  • Expand diagnostic capabilities to include more advanced features
  • Add support for European vehicle VINs
Show 5 more
  • Enable reading of additional fault codes (e.g., airbag)
  • Maintain compatibility with older iOS versions
  • Introduce CarPlay integration
  • Add customizable live data dashboards
  • Implement audible alerts for critical sensor readings

SLO/SLA Calc

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

BlueDriver OBD2 Scan Tool

No in-app purchases

None

SLO/SLA Calc

No in-app purchases

Questions

Is BlueDriver OBD2 Scan Tool free?
BlueDriver OBD2 Scan Tool is free to download, with no in-app purchases.
Is SLO/SLA Calc free?
SLO/SLA Calc costs $1.99, with no in-app purchases.
Which has better reviews, BlueDriver OBD2 Scan Tool or SLO/SLA Calc?
SLO/SLA Calc is rated higher. BlueDriver OBD2 Scan Tool averages 4.6 out of 5 from 14K ratings, while SLO/SLA Calc averages 5.0 from 1 ratings.
Do BlueDriver OBD2 Scan Tool or SLO/SLA Calc have ads?
Neither BlueDriver OBD2 Scan Tool nor SLO/SLA Calc shows ads.
Which is updated more often, BlueDriver OBD2 Scan Tool or SLO/SLA Calc?
BlueDriver OBD2 Scan Tool ships an update fortnightly, and SLO/SLA Calc every 11 days. Most recently, BlueDriver OBD2 Scan Tool was updated on November 8, 2026 and SLO/SLA Calc on October 31, 2026.

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