KBReader vs DiagNova
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KBReader
This app allows you to view, organize, and share PDF documents. It supports encrypted files, custom folders, and easy transfer from computers. Export your PDFs to various cloud storage and email services.
- View, navigate, and zoom PDFs
- Organize documents into folders
- Support for encrypted PDFs
- Transfer files via iTunes
- Export to cloud services
- Open PDFs from other apps
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KBReader is the free, amazing and the smartest ever PDF reader. Store and view your documents, transferring them easily from any Mac or PC. Export to Box, Dropbox, Google Drive, Evernote, Gmail, Copy, Yahoo! and many others. VIEW PDFs • Quickly open PDF documents from email, the web, or any app that supports “Open In…” • Navigate, scroll, zoom in and out • Usual, iBooks-like document navigation • Device rotation and all orientations ORGANIZE & REVIEW PDFs • PDF documents can be organized into folders including custom folders • Work with encrypted (password protected) PDFs STORE AND SHARE FILES • iTunes File Sharing for file transfers • Easily access your recent files always stored in RECENT folder • Store and share files in email apps such as Evernote, Gmail, Yahoo! etc. DO AS MUCH AS YOU CAN WITH PDF FILES • Support of the PDF links • Support of the PDFs with rotated pages EXPORT PDF FILES EVERYWHERE YOU NEED • Universal: designed for iPad, iPhone and iPod touch • Export files in email apps such as Box, Dropbox, Google Drive, Copy etc.
DiagNova
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DiagNova turns any ELM327-compatible OBD2 adapter into a guided diagnostic assistant. Most scanners stop at "here are your codes." DiagNova tells you the likely cause, whether the car is safe to drive, and walks you through the fix — using your car's own live data. WHY DIAGNOVA IS DIFFERENT • Guided live diagnosis — A decision-tree engine reads your live sensor data (RPM, fuel trims, MAF, O2, coolant) and ranks the most likely causes with confidence scores. No more swapping parts on a guess. • Safe-to-Drive verdict — A clear, conservative call — stop now, drive with caution, or you're OK — based on misfire severity, temperature, battery and code criticality. • Pre-MIL prediction — Reads Mode 06 on-board monitor trends to warn you before the check-engine light actually comes on. • Second-Opinion certificate — Export a shareable PDF that proves the diagnosis with the live data behind it. Bring it to the mechanic so you don't get upsold. • Multi-code root-cause correlation — When several codes fire together, DiagNova spots the single underlying fault that explains them. • Plain-language symptom search — Describe the problem in your own words and jump straight to the right playbook. EVERYTHING FROM ONE CHEAP ADAPTER • Stored, pending and permanent DTCs (Mode 03 / 07 / 0A). • Mode 06 on-board monitor test results and Mode 09 vehicle info (CALID / CVN / IUMPR). • Freeze-frame analysis — ranks causes from the snapshot saved when the fault triggered, no driving needed. • Per-cylinder misfire localization. • 97 DTC playbooks and 22 repair playbooks — and it learns: your repair outcomes refine the next diagnosis. EVERYDAY DASHBOARD • Live vitals strip — coolant, battery, fuel level, intake air, in real time. • Last-scan summary and session compare (DTC diff + PID trend charts). • Threshold alerts (coolant, fuel trim, battery) and readiness monitors for inspection. • VIN decoder, trip fuel-cost tracker, maintenance log with service reminders. • Adapter health check — detects common ELM327 clones and connection quality. • PDF / CSV export. FREE, PRIVATE, LOCAL-FIRST • 100% free — no subscription, no ads. • No accounts, no cloud, no tracking, no analytics. • All data stays on your device in a local SQLite database. Anything shared is strictly opt-in. WORKS WITH • Any ELM327-compatible adapter — BLE (Bluetooth Low Energy) and WiFi. DISCLAIMER DiagNova is a diagnostic aid, not a replacement for professional service. Always follow your vehicle manufacturer's repair procedures and observe safety warnings.
Screenshots
Verdict
The clearest difference is in-app purchases: DiagNova at none against KBReader's 1. KBReader's advantage is iOS requirement (7.0 vs 13.0). On price, ads 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
Both are free to download. KBReader sells 1 one-off in-app purchase. DiagNova asks for nothing beyond the download.
| Parameter | KBReader | DiagNova |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) — better | — |
| Positive reviews | 80.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 4 months | — |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 7.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 12 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | VLADYSLAV YERSHOV | KING DROID SRL |
In-app purchases
KBReader
- Remove ADs$0.99
DiagNova
No in-app purchases





