PromptLayer
PromptLayer sells a platform for engineering teams and domain experts to manage prompts, evaluate language-model outputs, and monitor AI applications.
StageEarly-stage
Founded—
HeadquartersNew York, USA
New York, USAStatusPrivate
Product
Selected offerings — the AI products recorded here, not the vendor's full catalogue.
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PromptLayer Observability Developer tool
PromptLayer Observability logs and traces language-model requests and AI agent workflows to analyze prompts, costs, latency, and performance.
Similar products 40
No sourced competitor yet: no filing, vendor document or measured-market report read so far names a rival for this company, so none is asserted. The companies below are the closest by what their products do.
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HoneyHiveEarly-stagePromptLayer Observability and HoneyHive both serve buyers who need to test and evaluate an AI agent and watch an AI agent for suspicious or runaway behaviour; same layer and the same scale band (early-stage private).1 of 1 capabilityShared product typeSame scale bandCompareL
LunaryUndisclosedPromptLayer Observability and Lunary both serve buyers who need to test and evaluate an AI agent and watch an AI agent for suspicious or runaway behaviour; scale not recorded for either.1 of 1 capabilityShared product typeCompareL
LaminarEarly-stagePromptLayer Observability and Laminar Signals both serve buyers who need to test and evaluate an AI agent and watch an AI agent for suspicious or runaway behaviour; same layer and the same scale band (early-stage private).1 of 1 capabilityShared product typeSame scale bandCompareAA
Arthur AIEarly-stagePromptLayer Observability and Arthur Engine both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; scale not recorded for either.1 of 1 capabilityShared product typeCompareCM
Comet MLEarly-stageOverlaps on evaluation and observability; scale not recorded for either.1 of 1 capabilityShared product typeCompareAA
Arize AIUndisclosedPromptLayer Observability and Arize Phoenix both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; scale not recorded for either.1 of 1 capabilityShared product typeCompareC
CoreWeavePublicPromptLayer Observability and CoreWeave Agent Lens both serve buyers who need to test and evaluate an AI agent and watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded.1 of 1 capabilityShared product typeCompareL
LiteLLMEarly-stagePromptLayer Observability and LiteLLM Lens both serve buyers who need to test and evaluate an AI agent and watch an AI agent for suspicious or runaway behaviour; scale not recorded for either; ships AI agent, application and 1 more rather than the same layer.1 of 1 capabilityDifferent layerCompareD
DeepchecksAbsorbedOverlaps on evaluation and observability; PromptLayer's scale not recorded; Deepchecks is absorbed, with no independent scale.1 of 1 capabilityShared product typeCompareL
LangWatchUndisclosedPromptLayer Observability and LangWatch Instant Evals both serve buyers who need to test and evaluate an AI agent; scale not recorded for either.1 of 1 capabilityShared product typeCompareM
MastraEarly-stagePromptLayer Observability and Mastra Studio both serve buyers who need to test and evaluate an AI agent; scale not recorded for either.1 of 1 capabilityShared product typeCompareG
GalileoAcquiredPromptLayer Observability and Galileo both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded; Galileo is acquired, with no independent scale; ships API service and platform rather than the same layer.1 of 1 capabilityDifferent layerCompareL
LangfuseAcquiredPromptLayer Observability and Langfuse both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded; Langfuse is acquired, with no independent scale; ships application and platform rather than the same layer.1 of 1 capabilityDifferent layerCompareW&
Weights & BiasesAcquiredPromptLayer Observability and W&B Weave both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded; Weights & Biases is acquired, with no independent scale.1 of 1 capabilityShared product typeCompareO
OpenRouterLate-stagePromptLayer Observability and Ori Eval both serve buyers who need to test and evaluate an AI agent; PromptLayer's scale not recorded.1 of 1 capabilityShared product typeCompareB
BraintrustLate-stagePromptLayer Observability and Patterns both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded; ships AI agent, application and 1 more rather than the same layer.1 of 1 capabilityDifferent layerCompareMA
Maxim AIUndisclosedPromptLayer Observability and Maxim both serve buyers who need to test and evaluate an AI agent; scale not recorded for either; ships application, infrastructure service and 1 more rather than the same layer.1 of 1 capabilityDifferent layerCompareL
LangChainLate-stagePromptLayer Observability and LangSmith Chat both serve buyers who need to test and evaluate an AI agent; scale not recorded for either.1 of 1 capabilityShared product typeCompareR
RespanEarly-stagePromptLayer Observability and Respan both serve buyers who need to test and evaluate an AI agent; ships API service and infrastructure service rather than the same layer.1 of 1 capabilityDifferent layerSame scale bandCompareH
HeliconeAcquiredPromptLayer Observability and Helicone both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded; Helicone is acquired, with no independent scale; ships API service and platform rather than the same layer.1 of 1 capabilityDifferent layerCompareS
SplunkAcquiredPromptLayer Observability and Splunk Agent Observability both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded; Splunk is acquired, with no independent scale.1 of 1 capabilityShared product typeCompareHA
Hume AIUndisclosedPromptLayer Observability and User Testing API both serve buyers who need to test and evaluate an AI agent; scale not recorded for either; ships API service, application and 3 more rather than the same layer.1 of 1 capabilityDifferent layerCompareC
ClickHouseLate-stagePromptLayer Observability and ClickStack both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; scale not recorded for either; ships agent platform, application and 2 more rather than the same layer.1 of 1 capabilityDifferent layerCompareE
ElasticPublicPromptLayer Observability and Elastic Observability both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded; ships agent platform, application and 3 more rather than the same layer.1 of 1 capabilityDifferent layerCompareD
DynatracePublicPromptLayer Observability and Dynatrace AI Observability both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; scale not recorded for either; ships application and platform rather than the same layer.1 of 1 capabilityDifferent layerCompareNR
New RelicUndisclosedPromptLayer Observability and New Relic AI Observability both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; scale not recorded for either; ships AI agent, application and 2 more rather than the same layer.1 of 1 capabilityDifferent layerCompareT
TrueFoundryEarly-stagePromptLayer Observability and TrueFoundry Agent Gateway both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; scale not recorded for either; ships API service, agent platform and 2 more rather than the same layer.1 of 1 capabilityDifferent layerCompareD
DatadogPublicPromptLayer Observability and AI Agents Console both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded.1 of 1 capabilityShared product typeCompareG
Guild.aiUndisclosedPromptLayer Observability and Guild agent control plane both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; scale not recorded for either.1 of 1 capabilityShared product typeCompareC
CrusoeLate-stageOverlaps on evaluation and observability; PromptLayer's scale not recorded.1 of 1 capabilityShared product typeCompareP
ParloaLate-stagePromptLayer Observability and Parloa Performance Lab both serve buyers who need to test and evaluate an AI agent; PromptLayer's scale not recorded; ships AI agent, agent platform and 1 more rather than the same layer.1 of 1 capabilityDifferent layerCompareM
Micro1UndisclosedPromptLayer Observability and Cortex both serve buyers who need to test and evaluate an AI agent and watch an AI agent for suspicious or runaway behaviour; scale not recorded for either; ships data service rather than the same layer.1 of 1 capabilityDifferent layerCompareC
CrewAIEarly-stagePromptLayer Observability and CrewAI AMP both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; scale not recorded for either.1 of 1 capabilityShared product typeCompareD
DatabricksLate-stagePromptLayer Observability and Agent Bricks both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded.1 of 1 capabilityShared product typeCompareA
AlibabaPublicPromptLayer Observability and AgentLoop both serve buyers who need to test and evaluate an AI agent and watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded.1 of 1 capabilityShared product typeCompareH
HarnessLate-stagePromptLayer Observability and AI Evals both serve buyers who need to test and evaluate an AI agent; scale not recorded for either.1 of 1 capabilityShared product typeCompareD
DecagonLate-stagePromptLayer Observability and Experiments both serve buyers who need to test and evaluate an AI agent; PromptLayer's scale not recorded; ships AI agent, agent platform and 1 more rather than the same layer.1 of 1 capabilityDifferent layerCompareC
CognigyAcquiredOverlaps on evaluation and observability; PromptLayer's scale not recorded; Cognigy is acquired, with no independent scale.1 of 1 capabilityShared product typeCompareHA
Hippocratic AILate-stagePromptLayer Observability and AI Call Supervisor both serve buyers who need to test and evaluate an AI agent and watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded; ships AI agent, agent platform and 1 more rather than the same layer.1 of 1 capabilityDifferent layerCompareP
PalantirPublicPromptLayer Observability and AIP Evals both serve buyers who need to test and evaluate an AI agent; PromptLayer's scale not recorded.1 of 1 capabilityShared product typeCompare
HoneyHiveEarly-stagePromptLayer Observability and HoneyHive both serve buyers who need to test and evaluate an AI agent and watch an AI agent for suspicious or runaway behaviour; same layer and the same scale band (early-stage private).1 of 1 capabilityShared product typeSame scale bandCompareLLunaryUndisclosedPromptLayer Observability and Lunary both serve buyers who need to test and evaluate an AI agent and watch an AI agent for suspicious or runaway behaviour; scale not recorded for either.1 of 1 capabilityShared product typeCompareLLaminarEarly-stagePromptLayer Observability and Laminar Signals both serve buyers who need to test and evaluate an AI agent and watch an AI agent for suspicious or runaway behaviour; same layer and the same scale band (early-stage private).1 of 1 capabilityShared product typeSame scale bandCompareAAArthur AIEarly-stagePromptLayer Observability and Arthur Engine both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; scale not recorded for either.1 of 1 capabilityShared product typeCompareCMComet MLEarly-stageOverlaps on evaluation and observability; scale not recorded for either.1 of 1 capabilityShared product typeCompareAAArize AIUndisclosedPromptLayer Observability and Arize Phoenix both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; scale not recorded for either.1 of 1 capabilityShared product typeCompareCCoreWeavePublicPromptLayer Observability and CoreWeave Agent Lens both serve buyers who need to test and evaluate an AI agent and watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded.1 of 1 capabilityShared product typeCompareLLiteLLMEarly-stagePromptLayer Observability and LiteLLM Lens both serve buyers who need to test and evaluate an AI agent and watch an AI agent for suspicious or runaway behaviour; scale not recorded for either; ships AI agent, application and 1 more rather than the same layer.1 of 1 capabilityDifferent layerCompareDDeepchecksAbsorbedOverlaps on evaluation and observability; PromptLayer's scale not recorded; Deepchecks is absorbed, with no independent scale.1 of 1 capabilityShared product typeCompareLLangWatchUndisclosedPromptLayer Observability and LangWatch Instant Evals both serve buyers who need to test and evaluate an AI agent; scale not recorded for either.1 of 1 capabilityShared product typeCompareMMastraEarly-stagePromptLayer Observability and Mastra Studio both serve buyers who need to test and evaluate an AI agent; scale not recorded for either.1 of 1 capabilityShared product typeCompareGGalileoAcquiredPromptLayer Observability and Galileo both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded; Galileo is acquired, with no independent scale; ships API service and platform rather than the same layer.1 of 1 capabilityDifferent layerCompareLLangfuseAcquiredPromptLayer Observability and Langfuse both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded; Langfuse is acquired, with no independent scale; ships application and platform rather than the same layer.1 of 1 capabilityDifferent layerCompareW&Weights & BiasesAcquiredPromptLayer Observability and W&B Weave both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded; Weights & Biases is acquired, with no independent scale.1 of 1 capabilityShared product typeCompareOOpenRouterLate-stagePromptLayer Observability and Ori Eval both serve buyers who need to test and evaluate an AI agent; PromptLayer's scale not recorded.1 of 1 capabilityShared product typeCompareBBraintrustLate-stagePromptLayer Observability and Patterns both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded; ships AI agent, application and 1 more rather than the same layer.1 of 1 capabilityDifferent layerCompareMAMaxim AIUndisclosedPromptLayer Observability and Maxim both serve buyers who need to test and evaluate an AI agent; scale not recorded for either; ships application, infrastructure service and 1 more rather than the same layer.1 of 1 capabilityDifferent layerCompareLLangChainLate-stagePromptLayer Observability and LangSmith Chat both serve buyers who need to test and evaluate an AI agent; scale not recorded for either.1 of 1 capabilityShared product typeCompareRRespanEarly-stagePromptLayer Observability and Respan both serve buyers who need to test and evaluate an AI agent; ships API service and infrastructure service rather than the same layer.1 of 1 capabilityDifferent layerSame scale bandCompareHHeliconeAcquiredPromptLayer Observability and Helicone both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded; Helicone is acquired, with no independent scale; ships API service and platform rather than the same layer.1 of 1 capabilityDifferent layerCompareSSplunkAcquiredPromptLayer Observability and Splunk Agent Observability both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded; Splunk is acquired, with no independent scale.1 of 1 capabilityShared product typeCompareHAHume AIUndisclosedPromptLayer Observability and User Testing API both serve buyers who need to test and evaluate an AI agent; scale not recorded for either; ships API service, application and 3 more rather than the same layer.1 of 1 capabilityDifferent layerCompareCClickHouseLate-stagePromptLayer Observability and ClickStack both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; scale not recorded for either; ships agent platform, application and 2 more rather than the same layer.1 of 1 capabilityDifferent layerCompareEElasticPublicPromptLayer Observability and Elastic Observability both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded; ships agent platform, application and 3 more rather than the same layer.1 of 1 capabilityDifferent layerCompareDDynatracePublicPromptLayer Observability and Dynatrace AI Observability both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; scale not recorded for either; ships application and platform rather than the same layer.1 of 1 capabilityDifferent layerCompareNRNew RelicUndisclosedPromptLayer Observability and New Relic AI Observability both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; scale not recorded for either; ships AI agent, application and 2 more rather than the same layer.1 of 1 capabilityDifferent layerCompareTTrueFoundryEarly-stagePromptLayer Observability and TrueFoundry Agent Gateway both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; scale not recorded for either; ships API service, agent platform and 2 more rather than the same layer.1 of 1 capabilityDifferent layerCompareDDatadogPublicPromptLayer Observability and AI Agents Console both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded.1 of 1 capabilityShared product typeCompareGGuild.aiUndisclosedPromptLayer Observability and Guild agent control plane both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; scale not recorded for either.1 of 1 capabilityShared product typeCompareCCrusoeLate-stageOverlaps on evaluation and observability; PromptLayer's scale not recorded.1 of 1 capabilityShared product typeComparePParloaLate-stagePromptLayer Observability and Parloa Performance Lab both serve buyers who need to test and evaluate an AI agent; PromptLayer's scale not recorded; ships AI agent, agent platform and 1 more rather than the same layer.1 of 1 capabilityDifferent layerCompareMMicro1UndisclosedPromptLayer Observability and Cortex both serve buyers who need to test and evaluate an AI agent and watch an AI agent for suspicious or runaway behaviour; scale not recorded for either; ships data service rather than the same layer.1 of 1 capabilityDifferent layerCompareCCrewAIEarly-stagePromptLayer Observability and CrewAI AMP both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; scale not recorded for either.1 of 1 capabilityShared product typeCompareDDatabricksLate-stagePromptLayer Observability and Agent Bricks both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded.1 of 1 capabilityShared product typeCompareAAlibabaPublicPromptLayer Observability and AgentLoop both serve buyers who need to test and evaluate an AI agent and watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded.1 of 1 capabilityShared product typeCompareHHarnessLate-stagePromptLayer Observability and AI Evals both serve buyers who need to test and evaluate an AI agent; scale not recorded for either.1 of 1 capabilityShared product typeCompareDDecagonLate-stagePromptLayer Observability and Experiments both serve buyers who need to test and evaluate an AI agent; PromptLayer's scale not recorded; ships AI agent, agent platform and 1 more rather than the same layer.1 of 1 capabilityDifferent layerCompareCCognigyAcquiredOverlaps on evaluation and observability; PromptLayer's scale not recorded; Cognigy is acquired, with no independent scale.1 of 1 capabilityShared product typeCompareHAHippocratic AILate-stagePromptLayer Observability and AI Call Supervisor both serve buyers who need to test and evaluate an AI agent and watch an AI agent for suspicious or runaway behaviour; PromptLayer's scale not recorded; ships AI agent, agent platform and 1 more rather than the same layer.1 of 1 capabilityDifferent layerComparePPalantirPublicPromptLayer Observability and AIP Evals both serve buyers who need to test and evaluate an AI agent; PromptLayer's scale not recorded.1 of 1 capabilityShared product typeCompareClosest alternatives are pairs a vendor page itself compares. Similar products are matched from what each product does; nothing in that group is asserted as a rivalry.
Sources
- Stage, from total funding
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Company disclosure · 14 Oct 2026
"PromptLayer has raised $4.8 million"
- Valuation
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Pages read for this record state no valuation or market capitalisation.
- Founded
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Pages read for this record state no founding year.
- Public listing
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No listing on the pages read; treated as private.
- Description
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Official documentation · 14 Oct 2026
Company page: "combines a prompt registry and visual prompt CMS with LLM evaluations, observability, and agent tracing."
Open PromptLayer in the directory
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