Keywords AI

Skip to main content[[][][[][]]]]]][]]][[]]][[]][[]][][[]]]]][[[[[]][[][[]]]]][[Respan announces $5M seed round, led by Gradient VenturesRead more ->][[]]]][]]]][]]][[][[][[][][]]][]]][]][[]][[]]]]]]]][[[]][]]Self-driving observability and evals for agentsTrace and evaluate agent behavior without guesswork. Surface issues automatically. Fix what breaks, faster.Start for freeGet a demoTraceEvaluateOptimizeDeployMonitorAI doesn't break. Its behavior shifts.Prompts change. Models update. Tools evolve. Respan gives teams the signals and controls to trace, evaluate, and ship AI that behaves the way it should.01 TraceKnow exactly what your agents did.Every prompt, tool call, and response - captured with rich context from real production traffic.End-to-end execution pathsSee every step from input to output with the context needed to debug fast. Search, filter, and sort traces by content, latency, cost, quality, tags, and custom metadata.Reproduce and inspect real sessionsOpen any production trace in the playground to replay behavior, test fixes, and debug failures in full context.Turn production traces into actionAssign runs for review or evaluation - or promote them into datasets to improve prompts, routing, and models.02 EvaluateTurn judgment into a system.Build evaluation workflows that combine human review, code checks, and LLM judges in one flow - all measured against the metrics that actually matter.Compose one evaluation flowRun code, human, and LLM judges in the same workflow instead of maintaining separate evaluation pipelines for each.Start from metrics, not toolingDefine the metrics first, then treat every judge as a function inside one evaluation system built around how quality is actually measured.Test against real product behaviorBuild and version datasets from production traces, generate synthetic cases, and compare prompts, models, and releases against baselines before shipping.03 OptimizeIterate on prompts, tools, and routing without losing control.Track every change, compare what actually improved, and keep optimization tied to real production signals.Version every moving partTrack prompt, tool, model, and workflow changes so you always know what changed, when, and why.Compare changes against real baselinesTest new prompt versions, tool behavior, and routing logic against prior versions using the same product data and evaluation criteria.Improve the system, not just the promptOptimize across prompts, tools, and orchestration together instead of treating each change like an isolated experiment.04 DeployShip through one gateway, not a mess of moving parts.Promote prompts, models, and workflows straight from the UI into production, with version control, rollout logic, and access to 500+ models through one gateway.Promote from UI to productionPush prompt and workflow versions live directly from the product, with prompt management and deployment connected in one system.Route across 500+ modelsDeploy through a single gateway that gives you flexible model choice, routing control, and provider abstraction without rebuilding infrastructure.Roll out with controlGate releases, compare live behavior, and keep a clean path to revert when prompts, models, or workflows regress.05 MonitorKnow when production shifts - and act before it spreads.Track the metrics that matter, sample live traffic for evaluation, and trigger alerts or automations when quality, cost, latency, or behavior moves in the wrong direction.Build monitoring around your businessCreate custom dashboards with 80+ graph types and metrics so teams can track quality, latency, cost, and product-specific signals their own way.Catch issues in real timeMonitor production behavior, sample live traffic for online evals, and get alerted in Slack, email, or text when something breaks or drifts.Turn monitoring into actionTrigger automations from production signals to build datasets, launch follow-up evaluations, or kick off response workflows automatically.The AI observability platform behind 80 trillion+ tokens. Loved by world-class founders, engineers, and product teams.“Imagine jumping to a log immediately after every LLM call. This is the dream for debugging.”Daniel WolfProduct Lead, AlphaSense“We scaled from 5M to 500M+ monthly API calls quickly. Respan gave us the debugging layer to resolve production issues 10x faster.”Read how Retell builds next-gen voice agents that scale ->Zexia ZhangCTO, Retell AI“Respan legit has some of the best UX/DX I’ve ever seen in my life. I truly don’t think I’ve ever integrated a product that was as easy.”Rahul BehalCo-founder, Gumloop“This one felt pretty nice.”Fabian HedinCTO, Lovable“Such a no brainer choice over LangSmith or anything else and super easy to set up.”Andy WangCEO, Finta“Respan has been key in helping us scale to trillions of tokens reliably with real-time observability.”Read how Mem0 builds reliable self-improving AI memory layer ->Deshraj YadavCTO, Mem0“Great product - really love the metrics dashboard.”Esha DinneCTO, Giga“We scaled from 5M to 500M+ monthly API calls quickly. Respan gave us the debugging layer to resolve production issues 10x faster.”Read how Retell builds next-gen voice agents that scale ->Zexia ZhangCTO, Retell AI“This one felt pretty nice.”Fabian HedinCTO, Lovable“Respan has been key in helping us scale to trillions of tokens reliably with real-time observability.”Read how Mem0 builds reliable self-improving AI memory layer ->Deshraj YadavCTO, Mem0See our wall of love →Respan is committed to maintaining compliance with the most rigorous international safety and security standards.ISO 27001Respan is fully compliant with ISO 27001, the internationally recognized standard for information security management.SOC 2We meet SOC 2 requirements to ensure secure and compliant management of data across all our systems.GDPRWith operations designed for global compliance, we operate under GDPR - the world's strictest standard for data privacy.HIPAARespan is HIPAA compliant with a Business Associate Agreement available for healthcare organizations.Works with your entire stackUse Respan with your favorite frameworks and tools.RespanBuilt for AI agents. Break less. Ship more.Start for freeGet a demo --- Skip to main content[]]][[][[[[[[[[[[[][[[]]][[]][]][[[[[[[[[[][]]]][[[][[][[][[Respan announces $5M seed round, led by Gradient VenturesRead more ->][[[[][[[[]]]]]][][[][][[]]]][[][][[[[][[]][][[[[[[][[][][]]PricingStart for free with your team, no credit card required. Designed to scale as you ship and grow like crazy.Pro$0For getting startedFull platform100k logs1k scores5 datasets2 evaluators5 promptsSign up for freeTeamPopular$199 per month-17%For startups and growing teamsEverything in ProUnlimited datasetsUnlimited evaluatorsUnlimited promptsPrivate Slack channelSOC 2 reportBilled yearlyTry for freeBook a demo ->EnterpriseContact usFor large organizationsEverything in TeamCustom packagesVolume discountCustom SLAsDedicated support engineerHIPAA BAATalk to salesBilled yearlyPro$0Sign up for freeTeamPopular$199 per month-17%Try for freeEnterpriseContact usTalk to salesObservabilityLogs100k logs100k logsCustomAdditional logs$8 / 100k logsVolume discountAgent tracingCost & usage trackingUser analyticsCustom propertiesTest environmentLog managementOpenTelemetry supportMulti-modality (image, voice)Error monitoringAlertsCustom dashboardsAdvanced filtersFull-text searchPrompt managementPrompts5 promptsUnlimitedUnlimitedCollaborative IDEVersion controlOne-click deploymentRelease managementModel playgroundExperimentsJinja templatesPrivate promptsEvaluationsScores1k scores10k scoresCustomAdditional scores$1 / 1k scoresVolume discountDatasets5 datasetsUnlimitedUnlimitedLLM-as-judge evaluators2 evaluatorsUnlimitedUnlimitedAnnotation queuesAI GatewayProxy throughput412 requests / min8,400 requests / minCustomUnified endpoint (500+ models)Key vault (BYOK)Built-in loggingRequest cachingAuto retries & fallbackLoad balancingSpending & rate limitsDataIngestion throughput412 logs / min4,200 logs / minCustomDefault retention period7 days30 daysCustomCustom retention periodConditional retentionPostHog integrationBatch export (JSONL, CSV)Scheduled webhooksCollaborationWorkspaces1 workspaceUnlimitedUnlimitedSeatsUnlimited5 membersCustomAdditional seats$0$15 / memberCustomGuest seatsCustomSecurityDeploymentCloudCloudCloud, Self-hostedSSOGoogleGoogleGoogle, SAMLAdmin rolesBasicAdvancedData retention managementOmit logsPII maskingSOC II reportsDPAHIPAA complianceAdd-on $249 / moSupportCommunity DiscordEmail supportPrivate Slack channelPriority supportSupport SLA8hCustomDedicated support engineerUptime SLA99.9%99.99%Built for AI agents. Break less. Ship more.Start for freeGet a demo --- Skip to main content]][[][[[]][[]]][[][[[[]][[]]][]][][]][[]]]]][[[[][[[][]][][[Respan announces $5M seed round, led by Gradient VenturesRead more ->][][][[]]][][]][[]][][[][[]]]]][[]]][]][[[[[[]]][][][][[[]]]Defining the next generation of the agent infra stackLLMs are changing how software is built, and the teams that ship AI in production need a whole new class of tooling.See open rolesOur storyRespan (formerly Keywords AI) started at the University of Illinois, where co-founders Andy and Raymond met as engineering students. They began by building an API to dynamically route LLM calls. Andy left school to lead the company full time, and the company later joined Y Combinator's Winter 2024 batch. Hendrix joined afterward and became the third co-founder.Early feedback made one thing clear: routing alone wasn't enough - developers needed visibility into how their agents behaved in production.Respan was rebuilt around that insight. Today, it helps teams trace workflows, evaluate agent behavior, and continuously improve quality in production. Hundreds of startups and enterprise teams now use Respan to operate AI agents at scale.Backed by incredible investorsOur backers include top venture firms and some of the most exceptional founders and operators building AI today.Zach Bratun-Glennon->General Partner, GradientDenise Teng->Partner, Gradient Harj Taggar->Managing Partner, Y Combinator Peter Pan->Managing Partner, Hat-Trick Capital Xiaohan XiangFounding Partner, XiaoXiao Fund Gadi Borovich->Managing Partner, Antigravity Fabian Hedin->CTO, LovableZexia Zhang->CTO, Retell AITodd Li->President, Retell AIDeshraj Yadav->CTO, Mem0Daniel Kivatinos->Co-founder, DrChrono & JustPaidWilliam Zeng->CEO, SweepJude Rizzo->Co-founder, CarouselDaniel WolfCo-founder, CarouselDawson Chen->CEO, MartinEthan Hou->CTO, MartinShuangling Yin->CTO, InspectMind AIPennie Li->CTO, A1BaseJinjing Liang->CEO, StablyAnand Chowdhary->CTO, FirstQuadrantRaymond Wang->CEO, AeroVectKarthik Narayanan->Co-founder, inaiIshaan Kolluri->Product, HeadwayMatthew Eggertson->Angel InvestorRichard Deng->Angel InvestorSteef Van Winkel->Angel InvestorWe care deeply about the quality of our workWe're a small team where every person has outsized impact. We ship weekly, talk to customers constantly, and live together in our company hacker house in Alameda.Andy Li->Co-founder, CEORaymond Huang->Co-founder, CTOHendrix Liu->Co-founder, Head of SalesFrank Chen->Head of DevRelMichael Mao->Founding EngineerRuifeng Zhang->Founding EngineerMarcus Huang->Product EngineerLeo Yu->Product EngineerYuyang Liu->Integrations EngineerTaro Ma->GTMWe're hiringWe're a 10-person team building the next generation agent infra stack. We care about craft and move fast. 13 open roles.See open rolesFrom our blogCompanyAnnouncing our new brand: RespanAI agents are becoming real software, but observability and eval tools haven't kept up. Respan is the first proactive LLM observability platform that closes the loop from agent observability to evaluation to iteration.Respan · February 20, 2026 --- Skip to main content[[]]]]]][][][][][]]][]][][[[]][]][[][]]]][]]]][[][[[]]][[[][Respan announces $5M seed round, led by Gradient VenturesRead more ->]]][[][]][]][[[[[][][][[][[]]][[[]]]][[][][[][]]]][[[]]]]][[<- BlogAnnouncing our $5M seed round led by Gradient VenturesRespan, a proactive observability platform for AI agents, has raised $5M in seed funding led by Gradient Ventures (Google's AI-focused venture fund), with participation from Y Combinator, Hat-Trick Capital, XIAOXIAO FUND, Antigravity Capital, Alpen Capital, and incredible angels and AI founders. The problem Teams shipping AI agents to production today are flying blind. The gap between a working prototype and a reliable production system is enormous — and most existing tools only help you look backward. You can collect traces. You can log requests. You can run evals in CI. But when an agent starts failing in production, most teams don't find out until users complain. And even then, figuring out what changed, why it broke, and what to do next takes hours of manual investigation. As AI agents get more complex — chaining multiple models, using tools, managing long-running sessions — the surface area for failure grows fast. Teams need more than dashboards. They need a system that connects observability to action. What we're building Respan is the first proactive AI observability platform that closes the loop from evals to production. Instead of just showing you what happened, Respan helps teams: Monitor production behavior across LLM providers with full traces, error payloads, and latency breakdowns Evaluate output quality continuously using model-based evals, user feedback, and custom scoring Detect regressions, drift, and cost anomalies before they become incidents Act on insights by connecting evaluation results to concrete next steps We built Respan because we experienced these problems firsthand. Every AI team we talked to was stitching together logging, eval frameworks, and alerting tools — and still struggling to maintain confidence in production. Our progress Over the last year, Respan has grown to support 100+ startups and enterprise teams. Today the platform processes 1B+ logs and 2T+ tokens every month, supporting 6.5M+ end users. We grew revenue more than 8x YoY in 2025. Teams across industries — from AI-native startups to Fortune 500 companies — rely on Respan to keep their agents running reliably at scale. What's next This funding accelerates our work on proactive observability: deeper evaluation frameworks, smarter alerting, and tighter integrations with the tools teams already use. Every serious AI team will need a system that connects observability, evaluation, and iteration — and we're building it. We're grateful to our customers, investors, and everyone who believed in this vision early. If you're building with LLMs and want better visibility into what's happening in production, get started with Respan.AuthorRespanCategoryCompanyDate15 hours agoReading time2 minTry Respan for freeMore articlesYou might also likeBrowse all posts ->CompanyAnnouncing our new brand: RespanAI agents are becoming real software, but observability and eval tools haven't kept up. Respan is the first proactive LLM observability platform that closes the loop from agent observability to evaluation to iteration.Respan · February 20, 2026ArticleHow AI agents actually work: a mental model for buildersLearn the mental model behind AI agents, from graph theory to finite state machines to LLM-driven transitions. A practical framework for designing, debugging, and communicating agent architecture.Frank Chen · March 9, 2026GuideBest Helicone alternatives after the Mintlify acquisitionHelicone was acquired by Mintlify and is entering maintenance mode. Compare the best Helicone alternatives for LLM observability, tracing, caching, and evaluation including Respan, Langfuse, LangSmith, Portkey, and more.Respan · March 4, 2026Built for AI agents. Break less. Ship more.Start for freeGet a demo