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Evidently AI alternatives: 3 apps ranked by verified data

Facts checked Nov 8, 2026AppBreakup editorialHow we rankAll LLM observability tools

Top picks

  • Fiddler AI logo

    Best overall

    Fiddler AI

    Developer plan: $0.002 per trace

  • Datadog logo

    Best free option

    Datadog

    Starting price: Infrastructure Pro, $15 per host/month billed annually

Common reasons people leave Evidently AI: code-first Python library, so non-engineers will struggle to set up checks, and you run and maintain the self-hosted platform yourself. We ranked 3 alternatives by how directly each one replaces Evidently AI, then by reviews, real visits and how recently each app's facts were checked against its own website. Fiddler AI currently ranks first.

Quick comparison

#AppPricingVerified priceOpen sourcePlatformsVerified factsScore
1Fiddler AI logoFiddler AIFree plan + paid$0.002 per traceNoWeb, Self-hosted4 of 468.8
2Datadog logoDatadogFree plan + paidInfrastructure Pro, $15 per host/month billed annuallyNoWeb, iOS, Android6 of 764.7
3Weights & Biases logoWeights & BiasesFree plan + paidFrom $60 a month (Pro), billed monthlyNoWeb, iOS6 of 652.6
  1. Fiddler AI logo

    1. Fiddler AITop pick

    Best for: Regulated enterprises that need agent observability, guardrails and AI governance in one platform

    Free plan + paidWeb, Self-hosted

    68.8

    score / 100

    Why switch from Evidently AI

    Managed enterprise platform with guardrails and governance on top of ML and LLM monitoring, if you'd rather not self-host.

    Pros

    • Monitors both predictive ML models and LLM agents in one place
    • Guardrails run on its own models, so checks don't add outside LLM API costs
    • Can be deployed as SaaS, in your VPC or on-premises
    • Governance and compliance features aimed at regulated industries

    Cons

    • Free plan covers guardrails only, not full observability
    • Not open source, unlike Evidently or Langfuse
    • Enterprise features and on-prem deployment need a sales contract
    Visit Fiddler AI Details and reviews
    How this score is calculated
    Editorial fit ×0.3100
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Fiddler AI a good Evidently AI alternative?

    Verified facts

    4 of 4 verified
    Free plan
    Real-time guardrails
    Checked Nov 8, 2026fiddler.ai(opens source in a new tab)
    Developer plan
    $0.002 per trace
    Checked Nov 8, 2026fiddler.ai(opens source in a new tab)
    Deployment
    SaaS, VPC or on-premise
    Checked Nov 8, 2026fiddler.ai(opens source in a new tab)
    Guardrail latency
    Under 80 ms
    Checked Nov 8, 2026fiddler.ai(opens source in a new tab)
  2. Datadog logo

    2. Datadog

    Best for: Cloud-heavy teams that want metrics, traces, logs and alerts in one hosted product and can budget for it

    Free plan + paidWeb, iOS, Android

    64.7

    score / 100

    Why switch from Evidently AI

    Adds LLM observability next to your existing APM, logs and infrastructure monitoring in one tool.

    Pros

    • Very wide integration catalogue that works with little setup
    • Metrics, traces and logs are linked in one interface
    • Mature dashboards, monitors and on-call features

    Cons

    • Per-product, per-host pricing makes bills hard to forecast
    • Custom metrics and log volume get expensive quickly
    • No self-hosted option
    Visit Datadog Details and reviews
    How this score is calculated
    Editorial fit ×0.341
    Reviews ×0.363
    Clicks (90 days) ×0.15100
    Freshness ×0.1590
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Datadog a good Evidently AI alternative?

    Verified facts

    6 of 7 verified
    Starting price
    Infrastructure Pro, $15 per host/month billed annually
    Checked Nov 8, 2026datadoghq.com(opens source in a new tab)
    Free tier
    Up to 5 hosts, 1-day metric retention
    Source changed Nov 8, 2026datadoghq.com(opens source in a new tab)
    Free trial
    14 days
    Checked Nov 8, 2026datadoghq.com(opens source in a new tab)
    Integrations
    1,000+
    Checked Nov 8, 2026datadoghq.com(opens source in a new tab)
    Enterprise plan
    $23 per host/month billed annually
    Checked Nov 8, 2026datadoghq.com(opens source in a new tab)
    APM plan
    From $31 per host/month
    Checked Nov 8, 2026datadoghq.com(opens source in a new tab)
    Free plan
    Yes, up to 5 hosts with 1-day metric retention
    Checked Nov 8, 2026datadoghq.com(opens source in a new tab)
  3. Weights & Biases logo

    3. Weights & Biases

    Best for: ML researchers and teams who want polished hosted experiment tracking and LLM evaluation

    Free plan + paidWeb, iOS

    52.6

    score / 100

    Why switch from Evidently AI

    Experiment tracking plus LLM tracing and evals in one hosted platform, if you already train models there.

    Pros

    • Very quick to add to existing training code
    • Integrations with nearly every major ML library
    • Covers experiments, sweeps, artifacts and LLM tracing in one place
    • Free for academic research

    Cons

    • Free plan has tight storage and seat limits
    • Costs grow with storage and data ingestion
    • Hosted product; the tracking server isn't open source like ClearML's
    Visit Weights & Biases Details and reviews
    How this score is calculated
    Editorial fit ×0.346
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Weights & Biases a good Evidently AI alternative?

    Verified facts

    6 of 6 verified
    Free plan
    Yes, $0 a month
    Checked Nov 8, 2026wandb.ai(opens source in a new tab)
    Pro plan
    From $60/month
    Checked Nov 8, 2026wandb.ai(opens source in a new tab)
    Free trial
    30 days (Pro)
    Checked Nov 8, 2026wandb.ai(opens source in a new tab)
    Academic use
    Free
    Checked Nov 8, 2026wandb.ai(opens source in a new tab)
    Mobile app
    iOS
    Checked Nov 8, 2026wandb.ai(opens source in a new tab)
    Starting price
    From $60 a month (Pro), billed monthly
    Checked Nov 8, 2026wandb.ai(opens source in a new tab)

The best Evidently AI alternative for…

The highest-ranked app in this list for each need.

Fiddler AI logo

Best Evidently AI alternative for most people

Fiddler AI

Managed enterprise platform with guardrails and governance on top of ML and LLM monitoring, if you'd rather not self-host.

Datadog logo

Best Evidently AI alternative for a free plan you can upgrade

Datadog

Adds LLM observability next to your existing APM, logs and infrastructure monitoring in one tool.

Datadog logo

Best Evidently AI alternative for iPhone and Android

Datadog

Adds LLM observability next to your existing APM, logs and infrastructure monitoring in one tool.

Weights & Biases logo

Best Evidently AI alternative for working in the browser

Weights & Biases

Experiment tracking plus LLM tracing and evals in one hosted platform, if you already train models there.

Evidently AI alternatives: common questions

What is the best alternative to Evidently AI?

Fiddler AI ranks first right now. Managed enterprise platform with guardrails and governance on top of ML and LLM monitoring, if you'd rather not self-host. Datadog and Weights & Biases follow it in our ranking.

Evidently AI vs Fiddler AI: what's the difference?

Evidently AI is free and open source; Fiddler AI is free with paid plans. Evidently AI is open source and Fiddler AI is not. Both run on Web.

Is Evidently AI free?

Evidently AI is free and open source.

How much do Evidently AI alternatives cost?

Verified prices for the top-ranked Evidently AI alternatives: Fiddler AI, $0.002 per trace; Datadog, Infrastructure Pro, $15 per host/month billed annually; Weights & Biases, From $60 a month (Pro), billed monthly. Each price was checked on the app's own site; see each card below for the date and source.

Is there a free alternative to Evidently AI?

Yes. Fiddler AI (free plan + paid), Datadog (free plan + paid) and Weights & Biases (free plan + paid) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to Evidently AI?

None of the 3 alternatives in this list is open source.

Why do people switch from Evidently AI?

The complaints we hear most: code-first Python library, so non-engineers will struggle to set up checks; you run and maintain the self-hosted platform yourself; lighter on prompt management and production tracing than LLM-first tools.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces Evidently AI, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.