Cybersecurity · head to head
Resolver vs Sigstore
Resolver
Cybersecurity
Risk, incident and investigations platform for corporate security and operational risk teams, owned by Kroll
- From
- On request
- Rated
- -
Sigstore
Cybersecurity
Free public signing and transparency infrastructure for open source artifacts
- From
- Free
- Rated
- -
The short version
- Only Sigstore has a free tier, so it costs nothing to try first.
- Each has a real cost: Resolver kroll ownership since 2022 means the product is sold alongside risk consulting services, so buyers who want software with no services attach should expect that conversation and should price the licence separately in negotiation.; Sigstore the security model depends on somebody watching the log. The documentation states that compromise of an identity provider or of Fulcio itself is detectable only if third parties monitor the transparency log, the monitoring tool is a community-tier rather than core project, and almost no consumer runs one.
- They diverge on capability: Resolver covers Incident management, Sigstore covers Fulcio.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Resolver and Sigstore actually diverge.
Identical on both: user rating (Not yet rated), category (Cybersecurity).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Resolver
- Incident management
- Investigations
- Enterprise risk management
- Internal audit
- Compliance and obligations
- Business continuity
- Risk Event Management
- Configurable dashboards
Only in Sigstore
- Fulcio
- Rekor
- Keyless signing
- Multi-language clients
- Timestamp authority
- Neutral governance
What people use each for
The jobs each tool is most often brought in to do.
Resolver
- A national retailer consolidating store incident reporting, loss prevention cases and investigations into one system with defensible evidence handlingnot Sigstore
- A bank that needs operational risk events captured against a risk and control register rather than in spreadsheets and emailnot Sigstore
- A university security operations centre running dispatch, case management and clery-style reporting from a single recordnot Sigstore
- An organisation that already retains Kroll for investigations and wants case intake and vendor handoff in the same platformnot Sigstore
Sigstore
- Open source projects signing releases without running a certificate authoritynot Resolver
- Organisations meeting a signed-artifact requirement without buying a signing productnot Resolver
- Publishing provenance that a consumer can verify independently of younot Resolver
- Self-hosting the same components where a public log is unacceptablenot Resolver
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Resolver
- Kroll ownership since 2022 means the product is sold alongside risk consulting services, so buyers who want software with no services attach should expect that conversation and should price the licence separately in negotiation.
- Configuration flexibility comes at the cost of implementation time, with deployments commonly running several months and typically requiring vendor or partner services, so the first-year cost is well above the annual licence.
- Module-based pricing means the platform gets expensive quickly once you add audit, compliance and continuity to a security-led purchase, and modules bought later rarely carry the discount of the original deal.
- The IT and cyber compliance side is thinner than dedicated tools, so organisations chasing SOC 2 or ISO 27001 evidence automation will find it does not replace a Drata or Vanta.
- Reporting is capable but the drag and drop builder has a real learning curve, and organisations that do not train an internal administrator end up raising support tickets for changes that should be self-service.
Sigstore
- The security model depends on somebody watching the log. The documentation states that compromise of an identity provider or of Fulcio itself is detectable only if third parties monitor the transparency log, the monitoring tool is a community-tier rather than core project, and almost no consumer runs one.
- It is a 99.5 percent objective with no service level agreement, which permits several hours of downtime a month and offers no remedy. A pipeline that signs on every build has taken a hard dependency on a free service with no contract behind it.
- Log scale is a live engineering problem rather than a theoretical one. The active shard holds billions of entries, the log has already been sharded twice, and sharding version 1 requires stopping traffic, which is why a replacement was built.
- Ten-minute certificates make trust depend on log availability. Verifying an older signature relies on the log entry proving it was made inside that window, so a lost or unreachable entry can render a valid artifact unverifiable.
- Migration debt is substantial and ongoing. Version 2 of the log is generally available but not the public default, the signing client has an announced breaking release ahead, some official clients lag the new log format, and a post-quantum migration is named as the next break after that.
Pricing, plan by plan
Resolver
On request- Resolver Core$undefined/year
- Priced by modules selected and number of users
- Annual or multi-year enterprise agreement
- Implementation and configuration quoted separately
Sigstore
Free- Public good instanceFree
- Free to everyone with no contract
- 99.5 percent availability objective, not an agreement
- 100KB cap per attestation upload
- Self-hostedFree
- Apache-2.0
- Run your own Fulcio and Rekor
- Rekor v2 available for self-hosters
Which should you pick?
Choose Resolver if
- You need incident management.
- You work on Web, iOS, Android.
- You also want investigations.
Choose Sigstore if
- You need fulcio.
- You want to start without paying.
- You work on Web, Linux, macOS, Windows, Self-hosted.
- You also want rekor.
Questions people ask
- Is Resolver or Sigstore better?
- Neither clearly leads. Resolver starts at On request and Sigstore at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Resolver or Sigstore?
- Sigstore has a free tier; the other does not. Paid plans start at On request for Resolver and Free for Sigstore.
- Does Resolver or Sigstore run on more platforms?
- Resolver runs on Web, iOS, Android. Sigstore runs on Web, Linux, macOS, Windows, Self-hosted.
- Can I use Sigstore for free?
- Yes. Sigstore has a free tier, so you can try it without paying. Resolver starts at On request.
- What is Resolver best used for?
- Resolver is most often used for a national retailer consolidating store incident reporting, loss prevention cases and investigations into one system with defensible evidence handling, a bank that needs operational risk events captured against a risk and control register rather than in spreadsheets and email, a university security operations centre running dispatch, case management and clery-style reporting from a single record, an organisation that already retains kroll for investigations and wants case intake and vendor handoff in the same platform. Of those, a national retailer consolidating store incident reporting, loss prevention cases and investigations into one system with defensible evidence handling and a bank that needs operational risk events captured against a risk and control register rather than in spreadsheets and email are not what Sigstore is typically brought in for.
- What can Resolver do that Sigstore cannot?
- Resolver covers Incident management, Investigations, Enterprise risk management, Internal audit. Sigstore covers Fulcio, Rekor, Keyless signing, Multi-language clients.
Answered from the vendors’ own pages
Resolver: Who owns Resolver?
Kroll, which acquired it in 2022. It is marketed as a Kroll business and sold alongside Kroll risk and investigations services.
Sigstore: Is the public instance really free?
Yes, with no contract and no paid tier. That is also the weakness: a 99.5 percent objective with no agreement, no remedy and support through Slack.
Resolver: What does Resolver cost?
Pricing is not published. It is quoted by module and user count on an annual or multi-year enterprise agreement, with implementation charged separately.
Sigstore: Has the public log moved to Rekor v2?
No. Version 2 reached general availability in October 2025 and self-hosters can use it, but the public instance still defaults to version 1 and the project has said it will for the foreseeable future.
Resolver: Is Resolver a SOC 2 compliance tool?
No. It is a risk, incident and investigations platform. Automated evidence collection for security certifications is not its strength.
Sigstore: Does Sigstore make my dependencies safe?
No, and this is a category error worth avoiding. It tells you who published something. It has no knowledge of what the artifact contains or whether it is vulnerable.
Resolver: How long does implementation take?
Months rather than weeks for a multi-module deployment, and most customers use vendor or partner services to configure it.
Sigstore: What are the rate limits?
Not published. Only the 100KB cap per attestation upload is documented, so do not design a high-volume pipeline around assumed throughput.
Sigstore: Should we self-host it?
If a public record of every signature is unacceptable, or if a free service with no agreement cannot sit in your build path, then yes. Otherwise the public instance is what most projects use.
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