BUYER'S GUIDE · AI OBSERVABILITY
Fiddler AI and CrowdStrike: What the Acquisition Means and the Best Fiddler Alternatives (2026)
CrowdStrike signed a definitive agreement on November 3, 2026 to acquire Fiddler AI, with closing expected by January 31, 2027. Nothing forces Fiddler customers to move today, but the announcement leaves standalone availability, deployment options and pricing unanswered. This guide sets out what is confirmed, what to ask your vendor, and the Fiddler alternatives worth a look.
The short answer
- Announced: CrowdStrike will buy Fiddler AI and sell its technology inside the Falcon platform as Falcon Observe. The deal is expected to close by January 31, 2027.
- Unanswered: whether Fiddler stays available on its own, which deployment options carry over, and what happens to pricing and renewals.
- How to choose: start from what you used Fiddler for. Classic ML monitoring, LLM and agent evaluation, and agent governance each point to different tools.
Disclosure: Algen AI, the company behind Traccia, wrote this guide. Traccia is one of the alternatives listed, so we held it to the same criteria as the others and stated its limits as plainly as theirs.
What CrowdStrike Announced About Fiddler AI
CrowdStrike said on November 3, 2026, at Fal.Con Europe in Barcelona, that it will buy two AI security companies: Fiddler AI (agent observability) and Dreadnode (automated AI security testing). (CSO Online)
- Timing: both deals are expected to close in CrowdStrike's fiscal Q4 2027, which ends January 31, 2027, subject to customary conditions. (SecurityWeek)
- Product: Fiddler's technology will be sold inside the Falcon platform as Falcon Observe, with general availability planned for the same quarter. (CityBiz)
- Scope: CrowdStrike says Falcon Observe will evaluate agent accuracy, task completion and policy compliance before deployment, trace decisions and tool calls in production, detect drift, hallucinations and unintended actions, and keep audit records. It expects to support OpenTelemetry, LangGraph, Amazon Bedrock, AWS Strands and Google ADK. (CSO Online)
- Price: neither company disclosed financial terms. Press reports citing the Wall Street Journal put Fiddler at about $400 million and Dreadnode at about $95 million, roughly $495 million combined, mostly cash with some vesting stock. Treat that as reported, not confirmed. (AI Weekly)
What Happens to Fiddler AI Customers: What Nobody Has Said Yet
As of November 9, 2026, neither company has said whether Fiddler will stay available on its own after the deal, or whether the deployment options some customers chose it for will carry over. One analyst review of the announcement makes the same point about on-premises and government-cloud options. (The Daily Brief)
That matters because Fiddler markets in-environment deployment: single-tenant SaaS or self-hosting in your own AWS, GCP or Azure account, with evaluation models that run inside your environment. Those are Fiddler's own claims. (Fiddler)
A Gartner analyst quoted by CSO Online said the announced timelines are not confirmation of final capabilities or integration plans. She advised customers to ask about pricing, packaging, migration terms, service continuity, support commitments, deployment models, data handling, telemetry retention and API access. She also said that putting agent observability inside a security platform could help teams correlate agent behavior with identity, runtime activity and security events, so the deal has a real upside for some buyers. (CSO Online)
- Will Fiddler remain available without a Falcon subscription, and for how long?
- Which deployment modes carry over: SaaS, VPC or self-hosted, government clouds?
- Which model providers and agent frameworks stay supported?
- What happens to your price and renewal terms?
- Who can read stored prompts and outputs inside a security platform, and for how long?
- Can you export your data, evaluators and alert rules, including history?
Who Owns AI Observability Now
Fiddler is at least the fifth AI observability vendor to be sold in 2026, so the question for any shortlist is no longer only features but who owns the product and what they have promised.
| Product | Buyer | Date | What has been said |
|---|---|---|---|
| Fiddler AI | CrowdStrike | Nov 3, 2026 | Agreement signed; close expected by Jan 31, 2027; to be sold as Falcon Observe |
| Arize (AX and Phoenix) | Dynatrace | Aug 13, 2026 | $915 million deal, since closed; Arize says it will keep supporting Phoenix and AX, with features folded into Dynatrace over time (GovConWire) |
| Galileo | Cisco (Splunk) | Apr 9, 2026 | Closed May 22, 2026; extends agent monitoring in Splunk Observability Cloud |
| Helicone | Mintlify, since separated | Mar 3, 2026 | Moved to maintenance mode after the deal. Helicone's site now says it is no longer part of Mintlify, with details to come (Helicone) |
| Langfuse | ClickHouse | Jan 16, 2026 | Both companies said no immediate change to the product, roadmap or open-source commitment (InfoWorld summary) |
| WhyLabs | Apple | Jan 2025 | Listed by CB Insights as acquired by Apple |
Still independent as far as we found, in a list that is not exhaustive: Braintrust, Comet (Opik), Evidently, LangChain (LangSmith) and Traccia. We found no acquisition announcement for any of them as of November 9, 2026. That can change for anyone, including us, so ask every vendor, ours included, what happens to your contract if it is sold.
How to Evaluate a Fiddler Alternative
Start from what you actually used Fiddler for, because the tools below cover different parts of it. Then score each candidate on the same eight questions.
| Criterion | Question to ask |
|---|---|
| Workload fit | Does it cover your real workload: classic ML models, LLM apps, or autonomous agents? |
| Ownership | Who owns it today, and what has the vendor said about a future sale? |
| Deployment | Is SaaS, VPC, self-hosted or air-gapped available, and does it keep your data in your environment? |
| Enforcement | Can it block or stop an action at runtime, or only report it afterwards? |
| Open standards | Does it ingest and export OpenTelemetry, so you can change backends again later? |
| Compliance evidence | Does it produce audit trails and exports for the rules that apply to you, such as the EU AI Act or HIPAA? |
| Cost model | Is it priced per trace, event, seat or host, and what do evaluations cost at your volume? |
| Exit | Can you export your data, evaluators, alert rules and history? |
The enforcement question is the one most comparisons skip. For why it decides whether a tool can control agents or only watch them, see AI Observability vs AI Governance.
The Fiddler Alternatives
These are grouped by the job you probably used Fiddler for, and listed alphabetically inside each group. Facts come from the vendors' own announcements and third-party listings linked in each entry. Check current terms with each vendor before you buy.
Agent Governance and Runtime Control
Galileo (Cisco). An evaluation, observability and guardrails platform for multi-agent systems, now part of Cisco's Splunk Observability. It suits teams already on Splunk. It has just been through the same ownership change that Fiddler is facing. (Cisco)
Traccia. An AI agent control plane built for agents, with observability and governance designed together from the start. It combines OpenTelemetry-native tracing, evaluations, cost attribution and runtime policies such as Spend Cap, Loop Cap, Refund Guard and High-Risk Tool, which check a model or tool call before it runs. It has an open-source Python SDK, a TypeScript SDK and a hosted platform. The SDKs auto-instrument OpenAI and Anthropic clients, have integrations for LangChain, CrewAI, the OpenAI Agents SDK and Gemini, and export OTLP to backends such as Grafana Tempo, Jaeger, Zipkin and SigNoz. On the Enterprise plan, the Compliance Hub keeps an AI system registry, reviews, incidents and evidence packs, with EU AI Act and HIPAA modules. Traccia runs as Traccia Cloud, or on your own infrastructure on the Enterprise plan, and the Free plan includes 50,000 events a month. (EveryDev listing, Product Hunt launch page)
Limits: Traccia is an emerging challenger. Algen AI released it in February 2026 and gave it a wider public launch on Product Hunt on August 27, 2026, and it is already deployed in enterprise environments, but its public footprint is smaller than that of the established vendors. It is built for agent observability and governance rather than for monitoring and explaining tabular ML models. The Compliance Hub and on-premises deployment need the Enterprise plan.
LLM and Agent Observability and Evaluation
Arize Phoenix and AX (Dynatrace). Phoenix is Arize's free, self-hosted observability and evaluation tool, and AX is its enterprise product. Phoenix is source-available under the Elastic License 2.0, which does not allow offering it to others as a hosted or managed service (license). Arize says it will keep supporting both while Dynatrace integrates its features over time. A natural fit if you already run Dynatrace. (GovConWire) Compare it with Traccia in Traccia vs Arize.
Braintrust. An evaluation-first observability platform that is still independent. It raised an $80 million Series B at an $800 million valuation in February 2026. In May 2026 it confirmed unauthorized access to an AWS account holding customer data and told customers to rotate keys, which is worth reading before you buy. (SiliconANGLE, Atlan's summary of the TechCrunch report) See also Traccia vs Braintrust.
Comet Opik. Open-source (Apache 2.0) LLM evaluation and tracing with a prompt playground. A good fit for teams that want an open-source stack from an independent vendor. (Market analysis)
Langfuse (ClickHouse). Open-source LLM observability, evaluation and prompt management that you can self-host, with the core under the MIT license. The hosted service has a free Hobby plan, and paid hosted plans start at $29 a month as of November 2026. Both companies said nothing changes immediately after the January acquisition; as with any acquisition, long-term priorities can shift. (Langfuse, Langfuse pricing) See also Traccia vs Langfuse.
LangSmith (LangChain). Tracing and evaluation that integrate most tightly with LangChain applications, priced per seat. (MojoAuth comparison) See also Traccia vs LangSmith.
Classic ML Monitoring and Explainability
Evidently. An open-source (Apache 2.0) framework that evaluates and monitors both predictive ML models and LLM applications, with more than 100 built-in metrics and open-source LLM tracing added in November 2025. The closest match if your Fiddler use was mostly model drift and data quality. (EveryDev listing)
Inside a Platform You Already Run
If you already pay for Dynatrace, Splunk or Datadog, check their AI modules first: Dynatrace now includes Arize, Splunk includes Galileo, and Datadog offers an LLM Observability product (see Traccia vs Datadog). One vendor and one bill are a real advantage, at the cost of less specialist depth.
We left Helicone out of the recommendations because it moved to maintenance mode after Mintlify bought it in March, and it has since left Mintlify with no word yet on what comes next. We left out WhyLabs because Apple bought it.
Fiddler Alternatives at a Glance
| Tool | Owner | Best fit | Watch-out |
|---|---|---|---|
| Arize Phoenix and AX | Dynatrace | Self-hosted tracing; Dynatrace customers | Phoenix is under the Elastic License 2.0; integration into Dynatrace planned over time |
| Braintrust | Braintrust | Evaluation-heavy engineering teams | Review the May 2026 security incident |
| Comet Opik | Comet | Open-source evaluation and tracing | Verify enterprise controls and support terms |
| Evidently | Evidently AI | Classic ML drift and data quality, plus LLM evaluation | Evaluation and monitoring focus; check whether you need runtime enforcement |
| Galileo | Cisco | Splunk shops that need agent evaluation and guardrails | Just acquired; roadmap tied to Splunk |
| Langfuse | ClickHouse | Open-source, self-hosted tracing and prompt management | New owner since January 2026 |
| LangSmith | LangChain | Apps built on LangChain | Seat-based pricing; strongest with LangChain |
| Traccia | Algen AI | Agent-native observability and governance, audit evidence, OpenTelemetry-first teams | Emerging challenger; not for tabular ML monitoring |
Which Way to Go
The right move depends on what you used Fiddler for, and nothing in the announcement forces a decision before the deal closes.
| If you used Fiddler for | Start with |
|---|---|
| Mostly classic ML monitoring and explainability | Evidently. Also ask CrowdStrike whether that workload is in scope for Falcon Observe, since its announcement describes agents. |
| Agents in production that need runtime policy and audit evidence | Compare Galileo and Traccia, and Falcon Observe if you already run CrowdStrike Falcon. |
| Traces, evaluations and prompt management for developers | Compare Arize Phoenix, Braintrust, Comet Opik, Langfuse and LangSmith. |
| Anything, and you already run Dynatrace, Splunk or Datadog | Check that platform's AI module before adding another vendor. |
Staying with Fiddler for now is reasonable too. Route agent telemetry through an OpenTelemetry collector you control, so a later switch is a configuration change rather than a re-instrumentation project. Fiddler advertises OpenTelemetry-compatible telemetry. (Fiddler)
Frequently Asked Questions
Has CrowdStrike finished acquiring Fiddler AI?
No. As of November 9, 2026 the two companies have signed a definitive agreement. Closing is expected in CrowdStrike's fiscal Q4 2027, which ends January 31, 2027, subject to customary conditions.
How much is CrowdStrike paying for Fiddler?
Neither company has disclosed terms. Press reports citing the Wall Street Journal put it at about $400 million for Fiddler and about $95 million for Dreadnode, roughly $495 million combined. Treat those figures as reported, not confirmed.
What is Falcon Observe?
Falcon Observe is the name CrowdStrike plans to use for Fiddler's technology inside its Falcon platform. General availability is planned for the same fiscal quarter as the close.
Will Fiddler stay available as a standalone product?
That has not been stated. CrowdStrike's announcement describes only a sale through the Falcon platform, so ask your account team for a written answer and a commitment period.
Do I need to switch away from Fiddler now?
Nothing in the announcement sets a deadline. Check your contract's change-of-control and renewal clauses, send your questions in writing, and keep your telemetry portable with OpenTelemetry.
What are the best open-source Fiddler alternatives?
Langfuse (core under the MIT license), Comet Opik and Evidently (both Apache 2.0), and the open-source Traccia SDK. Arize Phoenix is free to self-host, but it is source-available under the Elastic License 2.0, which does not allow offering it to others as a hosted or managed service. Langfuse now belongs to ClickHouse, and Phoenix to Dynatrace.
Is Traccia an alternative to Fiddler?
For agent observability, evaluation, runtime governance and audit evidence, yes. It is not a replacement for tabular ML model monitoring and explainability. As disclosed at the top, Algen AI makes Traccia.
Sources
All pages below were accessed on November 9, 2026. Ownership and pricing in this market change often; confirm with each vendor.
- CSO Online: CrowdStrike to acquire Fiddler, Dreadnode (https://www.csoonline.com/article/4244500/crowdstrike-to-acquire-fiddler-dreadnode-to-extend-ai-security-across-agent-lifecycle.html)
- SecurityWeek: CrowdStrike reportedly paying $495 million (https://www.securityweek.com/crowdstrike-reportedly-paying-495-million-for-ai-security-firms-fiddler-dreadnode/amp/)
- AI Weekly: reported prices for Fiddler AI and Dreadnode (https://aiweekly.co/alerts/crowdstrike-reportedly-to-pay-495m-for-fiddler-ai-dreadnode)
- CityBiz: Falcon Observe and timing (https://www.citybiz.co/?p=928416)
- The Daily Brief: what customers should get in writing (https://www.beri.net/article/crowdstrike-fiddler-acquisition-reported-400-million-falcon-observe-agent-observability-customer-continuity)
- Fiddler: deployment and OpenTelemetry claims (https://www.fiddler.ai/compare/fiddler-vs-arize)
- Dynatrace: press release on acquiring Arize (https://www.dynatrace.com/news/press-release/dynatrace-to-acquire-arize/)
- GovConWire: Dynatrace closes Arize deal (https://www.govconwire.com/?p=346020)
- Cisco: intent to acquire Galileo (https://blogs.cisco.com/news/cisco-announces-the-intent-to-acquire-galileo)
- Mintlify and Helicone announcement summary (https://www.plushcap.com/content/mintlify/blog/mintlify-mintlify-acquires-helicone-to-redefine-ai-knowledge-infrastructure)
- Helicone: no longer part of Mintlify (https://www.helicone.ai/)
- ClickHouse: acquisition of Langfuse (https://clickhouse.com/blog/clickhouse-acquires-langfuse-open-source-llm-observability)
- InfoWorld summary: ClickHouse acquires Langfuse (https://feedbagel.com/post/clickhouse-acquires-langfuse-llm-engineering-platform)
- Langfuse: joining ClickHouse (https://langfuse.com/blog/joining-clickhouse)
- CB Insights: Fiddler vs WhyLabs (https://www.cbinsights.com/compare/fiddler-labs-vs-whylabs)
- EveryDev: Traccia listing (https://www.everydev.ai/tools/traccia)
- Traccia Product Hunt launch page (https://www.hunted.space/product/traccia)
- SiliconANGLE: Braintrust Series B (https://siliconangle.com/2026/02/17/braintrust-lands-80m-series-b-funding-round-become-observability-layer-ai/)
- Atlan: Braintrust alternatives and the May 2026 incident (https://atlan.com/know/ai-agent/ai-agent-evals/braintrust-alternatives/)
- Langfuse pricing (https://langfuse.com/pricing)
- Arize Phoenix license (Elastic License 2.0) (https://github.com/Arize-ai/phoenix/blob/main/LICENSE)
- Market analysis: AI observability and LLMOps, March 2026 (https://moklabs-research.pages.dev/reports/market-analysis/2026-03-19-ai-observability-llmops-market)
- MojoAuth: AI eval and observability platforms (https://mojoauth.com/blog/top-9-ai-eval-observability-platforms)
- EveryDev: Evidently AI listing (https://www.everydev.ai/developers/evidently-ai)
- Traccia pricing (https://traccia.ai/pricing/)
- Traccia policies documentation (https://traccia.ai/docs/platform/policies/)
- Traccia Compliance Hub documentation (https://traccia.ai/docs/platform/governance/)
- Traccia integrations documentation (https://traccia.ai/docs/integrations/)
Keep your agent telemetry portable
Traccia traces every model and tool call with OpenTelemetry, checks runtime policies before a call runs, and keeps the evidence. Start free with 50,000 events a month.