# Razorline: OBD Track assistant — GPS lap timer & car telemetry

> GPS lap timer & car telemetry (iPhone/iPad app by Federico Gusmeroli.)

- Source: https://appshunter.io/ios/app/razorline-obd-track-assistant/id6785917563 (this page in markdown: same URL + `.md`)
- Developer: [Federico Gusmeroli](https://appshunter.io/developer/1881094497)
- Category: Sports, Navigation
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 33 MB
- Languages: American English, German (Germany), Italian
- Released: 2026-08-02
- Data updated: 2026-08-12
- User reviews in markdown: https://appshunter.io/ios/app/razorline-obd-track-assistant/id6785917563/reviews.md

## What is Razorline?

Razorline brings GPS lap timing, vehicle telemetry and driving analysis together in a focused motorsport dashboard. Record a session with your iPhone, connect a compatible BLE OBD-II adapter when you want engine data, or use the built-in simulator with no external hardware.

TIME EVERY LAP
• Create custom start/finish and sector lines on the map
• Follow live lap time, delta, sector colors and theoretical best
• Compare your current run with a saved ghost reference
• Keep sessions, best laps and sector results organized by circuit and vehicle

UNDERSTAND THE DATA
• Review speed traces, G-force, route position and available OBD-II channels
• Compare laps and vehicles to see where time was gained or lost
• Monitor compatible ELM327 data such as RPM, throttle and temperature
• Read diagnostic trouble codes and test the telemetry flow with the simulator

BUILD, RECORD AND SHARE
• Draw routes, record Tours and import GPX files
• Replay sessions on the map and export CSV, GPX, VBO or NMEA data
• Share Razorline challenges and Tour files with other drivers
• Customize the HUD around the information you need

RAZORLINE PREMIUM
Premium unlocks advanced ghost, replay, comparison, export and customization tools, together with expanded saved-content limits. Availability depends on the active App Store subscription shown before purchase. You can restore purchases and manage or cancel the subscription from your Apple account settings.

No account or login is required. Razorline is designed for closed circuits, track days, private roads and controlled environments. On public roads, obey local laws, keep your attention on driving and never interact with your phone while the vehicle is moving. Measurements are indicative and are not a substitute for certified instruments.

Terms of Use (Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Razorline Premium | $3.99 | per month |



## Version history (last 3 releases)

### 1.0.2 — 2026-08-12

Razorline 1.0.2 improves live timing, circuit sessions and replay analysis.

• Smoother telemetry comparison and replay playback, including at 4x speed
• More reliable replay zoom and a clearer Telemetry Comparison button in Replay
• Correct theoretical-lap totals and predictive delta behavior
• Improved grid starts: lap 0 before the line, accurate lap and total times, and automatic completion after the selected laps
• Speed traps now update to the vehicle record and also appear on the Live Dashboard
• Clearer live STOP controls and less intrusive start-line guidance, including a warning when the car must move back behind START
• Consistent replay names and device-local date and time
• Additional timing, map and stability fixes

### 1.0.1 — 2026-08-11

Razorline 1.0.1 makes the cockpit clearer and more consistent across the app.

• Refreshed typography, spacing, cards, dialogs, controls and empty states
• Larger touch targets and improved accessibility for key actions
• Map markers now stay correctly anchored during pan and zoom, with clearer map controls
• Fixed Premium entitlement checks when a subscription expires
• Saved Tours beyond the free limit are now correctly locked until Premium is restored
• Ghost mode now reflects the current Premium status
• Fixed an onboarding translation issue and other minor bugs

### 1.0.0 — 2026-08-03

No release notes.

## More apps by Federico Gusmeroli

- [Shift Helper: Work Scheduler](https://appshunter.io/ios/app/shift-helper-work-scheduler/id6759839515)

All apps by Federico Gusmeroli: https://appshunter.io/developer/1881094497

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-12.*