Prefactor Pricing 2026
Complete pricing guide for Prefactor — plans, costs, and free options.
💰 Prefactor Pricing Overview
Prefactor uses a freemium pricing model. Free tier available with optional paid upgrades. Current pricing: Prices in USD; every plan is the full platform with unlimited seats. Dev is free with 25,000 spans a month included: every step recorded, scored and risk-checked live, hold/approve/block enforcement and an SDK install. Scaleup is $199/month with the first 100,000 spans included, then $2.50 per 1,000 up to 4M a month, cancel any time; or $2,000/year with 100,000 spans a month included and a commit rate of $2.00 per 1,000 up to 4M a month. Scaleup adds 100% of activity in real time, dev/staging/prod environments and unlimited seats. Enterprise is custom for 4M+ spans a month, with rates stepping down at scale, self-hosted deployment, SSO and extended audit retention, an SLA and named engineer, and payment by invoice or PO. Annual billing saves up to a stated 20%. The published estimate for 1,000,000 spans a month is $2,500/month or $24,000/year committed. Scores, risk checks and interventions never create billable spans, and Prefactor never resells or marks up model usage.. Prefactor is a popular ai agent infrastructure tool known for scores, risk-checks and enforces every agent step in production; free to 25k spans, then $199/month. You can get started with Prefactor for free and upgrade to a paid plan as your needs grow.
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🔍 Compare Before You Buy
See all 5 alternatives →Comparing Prefactor to similar tools helps you make the best choice for your budget and needs:
AgentsProof
FreemiumTrace, grade and share AI agent eval reports from a few SDK calls, with custom graders and golden cases
Free plan + paid from $29/month
Compare with Prefactor →Kelet
FreemiumContinuously diagnoses why LLM apps and agents fail in production and generates the prompt patch
Free plan + paid from $400/month
Compare with Prefactor →Mastra
FreemiumTypeScript agent framework with observability, evals, and cloud deployment, from the creators of Gatsby
Starting at The framework is open source and free. Hosted platform tiers exist on the pricing page but the tier table is rendered client-side and not readable from a plain fetch, so no figure is quoted here.
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Prefactor Plans & Pricing
Dev is free with 25,000 spans a month included: every step recorded, scored and risk-checked live, hold/approve/block enforcement and an SDK install
Scaleup is
with the first 100,000 spans included, then $2.50 per 1,000 up to 4M a month, cancel any time
or
with 100,000 spans a month included and a commit rate of $2.00 per 1,000 up to 4M a month
Scaleup adds 100% of activity in real time, dev/staging/prod environments and unlimited seats
Enterprise
is custom for 4M+ spans a month, with rates stepping down at scale, self-hosted deployment
The published estimate for 1,000,000 spans a month is
or $24,000/year committed
* Pricing information is based on publicly available data and may not reflect current promotions, annual discounts, or regional pricing. Visit the official Prefactor website for the latest pricing.
Is Prefactor Free?
Prefactor offers a free tier that lets you try the platform without any payment. The free plan typically includes core features with usage limits. For power users, paid plans unlock additional features, higher limits, and priority support.
Prefactor Feature Comparison
Here's how Prefactor's key features are typically distributed across pricing tiers. Feature availability is estimated based on common SaaS patterns — check the official site for exact tier details.
| Feature | Dev is free with 25,000 spans a month included: every step recorded, scored and risk-checked live, hold/approve/block enforcement and an SDK install | Scaleup is | or | Scaleup adds 100% of activity in real time, dev/staging/prod environments and unlimited seats | Enterprise | The published estimate for 1,000,000 spans a month is |
|---|---|---|---|---|---|---|
| Deterministic scoring and risk checks on 100% of agent activity, with no per-check cost | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Real-time enforcement — hold, approve or block an agent action mid-run | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Eval-gated promotion across dev, staging and production, with instant version rollback | ◐ | ✓ | ✓ | ✓ | ✓ | ✓ |
| PII checks built into the reliability loop rather than sold separately | — | ◐ | ◐ | ✓ | ✓ | ✓ |
| Unlimited seats on every plan; bring your own model keys with no token markup | — | — | ◐ | ◐ | ✓ | ✓ |
✓ = Full access · ◐ = Limited · — = Not available. Feature availability is estimated and may vary.
Is Prefactor Worth It?
Prefactor is a freemium ai agent infrastructure tool that offers 5 key features including Deterministic scoring and risk checks on 100% of agent activity, with no per-check cost, Real-time enforcement — hold, approve or block an agent action mid-run, Eval-gated promotion across dev, staging and production, with instant version rollback. Prefactor is an evaluation runtime for AI agents in production, and the distinction it draws against agent observability tools is that it does not stop at recording — it scores every step live and can act on the score. The unit of measurement is a span, defined as one step an agent takes: an LLM call, a tool invocation, a message turn, or a custom business step you mark. The SDK records them automatically, and then deterministic scoring, risk checks, pattern and sequence checks and PII checks run on 100% of activity rather than a sample, with no per-check cost and no tokens consumed by the deterministic path. Scores and checks never create spans, so the meter measures your agent's work rather than the observability of it. Enforcement is the part most tools in this space lack: Prefactor can hold, approve or block an action in real time, gate promotion between development, staging and production on evaluation results, and roll an agent version back instantly. The problems it names are the ones teams actually hit — hidden failures, manual evaluation, being stuck at proof-of-concept, data leakage, runaway costs and having no kill switch — and it maps its controls to the EU AI Act, GDPR, ISO 42001, NIST AI RMF, SOC 2, ISO 27001, HIPAA and the OWASP LLM Top 10. Your models and keys stay yours with no token markup, seats are unlimited on every plan, and self-hosting is available. The meter climbs fast at scale: 1M spans a month runs $2,500 monthly or $24,000 committed annually.
✅ Prefactor is a good choice if you need:
- •Deterministic scoring and risk checks on 100% of agent activity, with no per-check cost
- •Real-time enforcement — hold, approve or block an agent action mid-run
- •Eval-gated promotion across dev, staging and production, with instant version rollback
- •PII checks built into the reliability loop rather than sold separately
- •Unlimited seats on every plan; bring your own model keys with no token markup
💡 Value Assessment
With a free tier available, Prefactor is an easy recommendation for anyone looking to try ai agent infrastructure tools without financial commitment. The paid plans offer good value for power users who need the additional features and higher usage limits.
Prefactor Key Features
Prefactor comes packed with features that make it a strong contender in the ai agent infrastructure space. Here's what you get:
Available in the free plan with limits — Deterministic scoring and risk checks on 100% of agent activity, with no per-check cost helps you work more efficiently with Prefactor.
Available in the free plan with limits — Real-time enforcement — hold, approve or block an agent action mid-run helps you work more efficiently with Prefactor.
Available in the free plan with limits — Eval-gated promotion across dev, staging and production, with instant version rollback helps you work more efficiently with Prefactor.
Available in the free plan with limits — PII checks built into the reliability loop rather than sold separately helps you work more efficiently with Prefactor.
Available in the free plan with limits — Unlimited seats on every plan; bring your own model keys with no token markup helps you work more efficiently with Prefactor.
Prefactor Alternatives & Their Pricing
Considering alternatives to Prefactor? Here's how competing tools compare on pricing:
AgentsProof
FreemiumTrace, grade and share AI agent eval reports from a few SDK calls, with custom graders and golden cases
Pricing: Two tiers. Free is $0 forever and is aimed at indie builders: 1 project, 200 eval runs per month, the default LLM grader, 10 golden test cases, 1 proof suite, public proof reports and basic email support; custom graders and private proof reports are excluded. Pro is $29 per month, or $290 per year which the page frames as two months free, with unlimited projects, 10,000 eval runs per month, unlimited custom graders, unlimited golden test cases, unlimited proof suites, both public and private proof reports, and priority email support. One eval run is one call to startRun(); steps and proof-suite cases within a run are not counted separately. Exceeding the free limit makes new runs return a 402 from the SDK while existing reports remain accessible. Pro can be cancelled from the billing portal at any time.
Kelet
FreemiumContinuously diagnoses why LLM apps and agents fail in production and generates the prompt patch
Pricing: Starter is $0 forever: 500 sessions/month, 15-day data retention, full root-cause analysis, prompt patch generation, OTEL and Langfuse integration, and community support. Startup is listed at $400/month but is free during early access — 5,000 sessions included per month with pay-per-session above that, 30-day retention and email support. Enterprise is custom with unlimited sessions, custom retention and integrations, SSO/SAML, an SLA and dedicated support. Human signals and feedback collection are free forever on every tier. No credit card required to start; the vendor states 30 days' notice before pricing changes and grandfathering for early users.
Mastra
FreemiumTypeScript agent framework with observability, evals, and cloud deployment, from the creators of Gatsby
Pricing: The framework is open source and free. Hosted platform tiers exist on the pricing page but the tier table is rendered client-side and not readable from a plain fetch, so no figure is quoted here.
Manufact
FreemiumCloud hosting, testing, and observability for MCP servers and ChatGPT/Claude apps, built on the mcp-use SDK
Pricing: Usage-based pricing that scales with you: every plan includes a monthly pool of credits, then pay-as-you-go once the pool is used. Per-credit rates are rendered client-side and not readable from a plain fetch.
Agnost AI
FreemiumAnalyzes production agent conversations to find the failures your evals miss, then proposes reviewed fixes
Pricing: The site offers a self-serve 'try now' entry point and docs but publishes no tier pricing as of July 2026, so cost above the trial is a sales conversation.
Is Prefactor your tool?
Claim this listing to get a Featured badge, correct the pricing on this page yourself, and stand out from the 5 alternatives listed above. All plans include a permanent dofollow backlink to your site.
Claim Now →Ready to try Prefactor?
Visit the official website for the latest pricing and to get started.
Frequently Asked Questions
Is Prefactor free to use?
Yes, Prefactor offers a free tier that you can use without paying. Paid plans starting at See website unlock additional features and higher usage limits.
How much does Prefactor cost in 2026?
As of 2026, Prefactor pricing is: Prices in USD; every plan is the full platform with unlimited seats. Dev is free with 25,000 spans a month included: every step recorded, scored and risk-checked live, hold/approve/block enforcement and an SDK install. Scaleup is $199/month with the first 100,000 spans included, then $2.50 per 1,000 up to 4M a month, cancel any time; or $2,000/year with 100,000 spans a month included and a commit rate of $2.00 per 1,000 up to 4M a month. Scaleup adds 100% of activity in real time, dev/staging/prod environments and unlimited seats. Enterprise is custom for 4M+ spans a month, with rates stepping down at scale, self-hosted deployment, SSO and extended audit retention, an SLA and named engineer, and payment by invoice or PO. Annual billing saves up to a stated 20%. The published estimate for 1,000,000 spans a month is $2,500/month or $24,000/year committed. Scores, risk checks and interventions never create billable spans, and Prefactor never resells or marks up model usage.. Pricing may vary based on billing cycle (monthly vs annual) and region. Visit the official Prefactor website for the most current pricing.
What is the cheapest Prefactor plan?
The cheapest option is the free tier. If you need premium features, the most affordable paid plan is Dev is free with 25,000 spans a month included: every step recorded, scored and risk-checked live, hold/approve/block enforcement and an SDK install at See website.
Does Prefactor offer enterprise pricing?
Yes, Prefactor offers custom enterprise pricing with features like dedicated support, custom integrations, enhanced security, and volume discounts. Contact their sales team for a personalized quote.
What are the best alternatives to Prefactor?
Popular alternatives to Prefactor include AgentsProof, Kelet, Mastra. Each offers different features and pricing structures. Compare them on AISO Tools to find the best fit for your needs and budget.
Is Prefactor worth the price?
Prefactor is well-regarded in the agent-infrastructure space, offering features like Deterministic scoring and risk checks on 100% of agent activity, with no per-check cost, Real-time enforcement — hold, approve or block an agent action mid-run, Eval-gated promotion across dev, staging and production, with instant version rollback. Whether it's worth the investment depends on your specific needs, usage volume, and budget. The free tier lets you try it before committing to a paid plan.
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