Kernel is a well-known name in the PST tool market. Their free PST Viewer downloads several million times and the paid Kernel for Outlook PST Repair / Recovery tier handles the higher-end use cases. Sherlock Forensics is the new entrant at the same general price point with a different product philosophy.
This page is the honest comparison for the buyer deciding between them.
Pricing
| Product | Price | License model | What you get |
|---|---|---|---|
| Sherlock Forensics PST Viewer Forensic Edition | $67 | Lifetime, one-time | PST, OST, MSG, EML viewing + forensic features + all export formats |
| Kernel PST Viewer (free) | Free | Free | Read-only viewing, no export, no forensic features |
| Kernel for Outlook PST Repair | $99 | Per-tier, renewable | PST repair + export to PST/EML/MBOX |
| Kernel for Outlook PST Repair (Corporate) | $299 | Per-tier, renewable | Bulk processing + technician licensing |
The free Kernel PST Viewer is genuinely free for viewing but produces no export. The buyer ends up at the $99 Kernel paid tier the moment they need to extract anything from the PST.
Sherlock at $67 sits below Kernel's first paid tier and includes export to EML, MBOX and PDF plus the forensic features Kernel does not offer at any tier.
Format Coverage
| File format | Sherlock | Kernel PST Viewer | Kernel for Outlook PST Repair |
|---|---|---|---|
| PST (ANSI) | Yes | Yes | Yes |
| PST (Unicode 2013+) | Yes | Yes | Yes |
| OST | Yes | No (separate Kernel product) | No (separate Kernel product) |
| MSG | Yes | No | No |
| EML | Yes | No | No |
Sherlock's single PST Viewer Forensic Edition covers PST, OST, MSG and EML at the $67 lifetime price. Kernel's coverage of OST, MSG and EML requires purchasing separate Kernel products, Kernel OST to PST Converter at $249, etc.
For a buyer who handles multiple Microsoft email file formats (common in IT, forensic and legal contexts), the format breadth alone justifies Sherlock over Kernel.
Forensic Features Compared
The structural product difference.
| Feature | Sherlock | Kernel PST Viewer / Repair |
|---|---|---|
| SHA-256 per-artifact hashing | Yes | No |
| Chain of custody logging | Yes | No |
| Court-ready forensic PDF report | Yes | Basic PDF report only |
| SMTP transport chain visualization | Yes | No |
| SPF / DKIM / DMARC authentication surfacing | Yes | No |
| Examiner attestation block | Yes | No |
| Tamper-evident report format | Yes | No |
| Bounds-checked forensic-resilience parsing | Yes | Standard |
| Encryption metadata surfacing | Yes | Limited |
Kernel produces a working PST tool. Sherlock produces a working PST tool plus the forensic chain that defends the output in court, in deposition or in regulatory review.
For non-evidentiary use, the difference does not matter and Kernel's free tier is the right purchase. For evidentiary use, the difference is the entire product distinction.
PST Format Compatibility : ANSI and Unicode
Both products handle Unicode PSTs (Outlook 2013+) without trouble.
ANSI PSTs (Outlook 2002 and earlier, plus Outlook 2003 Personal Folders mode) require different parsing. Kernel handles ANSI PSTs through its repair tools but the free viewer may not always open them cleanly. Sherlock's parser routes ANSI vs Unicode based on the header wVer field and produces diagnostic detail if the format cannot be matched.
For modern Outlook PSTs (2013-2026), both work. For legacy ANSI PSTs from inherited archives, Sherlock's explicit format handling is more reliable.
License Model Differences
Sherlock Forensics PST Viewer Forensic Edition is one-time purchase, lifetime license. The buyer pays $67 once and owns the tool for the entire forensic practice or IT career.
Kernel's tier pricing is per-version. Each major version upgrade typically requires re-purchase or maintenance renewal. Across a five-year forensic-practice horizon, Kernel's total cost meaningfully exceeds the upfront tier price.
For forensic practices building a long-term toolkit, the lifetime license simplifies budgeting and removes renewal-tracking overhead. For one-off project use, both license models are acceptable.
When Kernel Is the Right Choice
- You need PST repair capability specifically, heavily corrupted PSTs where the file structure is damaged enough that read-only examination is not sufficient.
- You are an existing Kernel customer with maintenance and workflow inertia around the Kernel toolchain.
- You need direct PST-to-PST conversion at scale (bulk migration tooling).
- Your use case is non-evidentiary and the free Kernel PST Viewer tier handles it.
In those scenarios, Kernel's tooling is purpose-built and the right purchase.
When Sherlock Is the Right Choice
- You handle PST examination in an evidentiary context, litigation, e-discovery, internal investigation, regulatory inquiry.
- You need format breadth across PST, OST, MSG and EML in a single tool.
- You want lifetime licensing rather than per-version renewal.
- You need SMTP transport chain visualization or SPF/DKIM/DMARC authentication analysis (Kernel does not produce these).
- You produce court-ready PDF reports with chain of custody as your standard deliverable.
In those scenarios, Kernel's repair-tool positioning does not match the forensic-tool requirement and Sherlock is the correct purchase.
Side-by-Side Feature Matrix
| Sherlock PST Forensic | Kernel PST Viewer (free) | Kernel for Outlook PST Repair ($99+) | |
|---|---|---|---|
| Price | $67 lifetime | Free | $99 - $299+ per-tier |
| License | One-time | Free | Per-tier renewal |
| Reads PST (ANSI + Unicode) | Yes | Yes | Yes |
| Reads OST | Yes | No (separate $249 Kernel product) | No |
| Reads MSG | Yes | No | No |
| Reads EML | Yes | No | No |
| Export to EML (with folder hierarchy) | Yes | No | Yes |
| Export to MBOX | Yes | No | Yes |
| Export to PDF (per-email or bundled report) | Yes | No | Limited |
| SHA-256 per artifact | Yes | No | No |
| Chain of custody log | Yes | No | No |
| Court-ready forensic PDF | Yes | No | Basic |
| SMTP transport chain visualization | Yes | No | No |
| SPF / DKIM / DMARC analysis | Yes | No | No |
| Forensic-resilience parsing | Yes | Standard | Standard |
| Cross-platform Windows + macOS | Yes | Windows only | Windows only |
| Refund / trial | 30 day money back | Free tier | 30 day money back |
Final word
If you are looking for a free PST reader for casual viewing, Kernel PST Viewer free is competently built. Download it, use it, move on.
If you are looking for a forensic-grade tool that handles PST plus OST plus MSG plus EML in one product with chain of custody documentation, Sherlock Forensics PST Viewer Forensic Edition at $67 lifetime is the better fit than Kernel's per-tier paid tools. The forensic features Kernel does not offer at any tier are what justify the structured premium.
30 day money-back guarantee. One-time purchase, lifetime license. Windows + macOS.