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AI-NATIVE API TEST FLOWS

Test APIs with context, history, and AI-powered diagnosis

Build readable test flows, reuse tokens and variables across requests, inspect historical results, and help your team understand why an API test failed.

Get Started

Open-source core, collaborative workspaces, and enterprise-grade diagnostics.

Context-aware test flow

POST /auth/login

Bearer token forwarded automatically from the login step

GET /me

Session cookie injected into downstream requests

POST /billing/preview

tenantId variable captured from the previous response

x-trace-context propagated through the entire flow

Treat every request as one step in the same engineered workflow.

AI diagnosis

The login step returned a new session_id, but step three still references a cached header from the old session. Remap the session variable after step two.

Built for modern API teams

NORTHSTACK
VECTORLAB
AURORA API
SHIPYARD
LATTICE
STACKPORT
TRACEGRID
MERIDIAN
UNIT 47
ORBITAL

Core capabilities

Put API testing, historical insight, and team collaboration in one workspace

kest is not just a request sender. It unifies execution chains, reusable context, historical results, and team signals into one engineered testing system.

Visual Test Flows

See the full request chain, step health, and dependency relationships in one visual flow.

Context-Aware Requests

Carry tokens, cookies, headers, and variables forward without manual copy-paste.

Historical Results

Review execution history, timing, state changes, and regression trends over time.

Team Collaboration

Share flows, annotations, status signals, and workspaces across the whole team.

.flow.md Workflow Files

Keep test definitions readable like docs while remaining structured enough for AI.

AI Failure Diagnosis

Explain failures with request context, response data, and the surrounding execution chain.

Visualize the chain

See every test as a connected flow

Stop reasoning about one request at a time. Inspect the full test chain, request dependencies, variable propagation, and execution status step by step.

Flow-based request organization
Dependency visibility
Step-by-step execution tracing
Token and variable propagation
Explore visual flows

Flow canvas

Login

Create auth.token and session.current

Identity

Read profile.id and assemble tenant context

Billing

Inject invoice_session from shared variables

Regression report

Publish failure summary and change impact

History and collaboration

Track results over time and keep teams aligned

Let the team inspect historical runs, failure records, release impact, and live collaboration state in one place so regressions are easier to triage together.

Execution history
Shared workspaces
Team status visibility
Comments and collaboration signals
Open shared workspaces

Team timeline

Today 09:42 · Billing regression failed

Lina added a comment: session refresh timing looks inconsistent

Marco confirmed the change came from auth-service@v2.18

Impacted flows: checkout-flow, billing-preview

AI + .flow.md

Readable workflows for humans, diagnosable by AI

.flow.md files keep test definitions readable like living documentation while exposing enough structure for AI to interpret context, explain failures, and speed up onboarding.

Human-readable test definitions
AI-readable structured workflows
Failure explanation with context
Faster debugging and onboarding
Review workflow examples

.flow.md snapshot

.flow.md snapshot

flow "billing-preview" uses auth.login -> user.profile -> billing.preview

capture response.token as session.current.token

replay headers.authorization from session.current.token
ai note: compare failure with last green run and auth refresh timing

Plans and pricing

Start open, then scale governance when the team needs it

Match the Miro-style four-tier structure with API testing plans for individuals, growing teams, production workspaces, and enterprise governance.

MonthlyAnnualSave 15%

Free

For individual developers building readable API workflows.

$0

per user / month

Start free
  • Local workspaces and request collections
  • Basic .flow.md authoring
  • Seven-day execution history

Starter

For small teams moving repeated tests into shared workspaces.

$8

per user / month

Choose Starter
  • Shared workspaces and environments
  • Reusable variables and examples
  • Thirty-day run history

Business

Popular

For teams that need reliable diagnostics and release confidence.

$16

per user / month

Choose Business
  • Priority AI failure diagnosis
  • Advanced workspace roles
  • Unlimited run history

Enterprise

For organizations with security, governance, and audit needs.

Custom

annual contract

Contact sales
  • Custom deployment and SSO
  • Dedicated audit and retention controls
  • Workspace governance support

Compare the essentials

FreeStarterBusinessEnterprise
Visual test flows
Flow canvasBasicStandardAdvancedCustom
Request dependenciesLimitedIncludedPriorityCustom
Step health signalsBasicStandardAdvancedCustom
Variable captureLimitedIncludedIncludedCustom
Shared flow templatesLimitedStandardAdvancedCustom
Branch comparisonBasicTeamAdvancedCustom
Reusable environmentsBasicStandardAdvancedCustom
Collection nestingBasicStandardAdvancedCustom
Flow commentsLimitedTeamIncludedCustom
Run queueBasicStandardPriorityCustom
Scheduled checksLimitedStandardAdvancedCustom
Reusable assertionsBasicStandardAdvancedCustom
Team librariesLimitedTeamAdvancedCustom
Flow importBasicStandardIncludedCustom
Flow exportBasicStandardIncludedCustom
Visual diffLimitedLimitedAdvancedCustom
Workspace graphBasicStandardAdvancedCustom
Context replayLimitedStandardPriorityCustom
Shared scratchpadsBasicTeamIncludedCustom
Flow approvalsLimitedLimitedAdvancedCustom
Execution history
Run history retention7 days30 daysUnlimitedUnlimited
Failure timelineBasicStandardAdvancedCustom
Response snapshotsLimitedStandardIncludedCustom
Latency trendsBasicStandardAdvancedCustom
Change markersLimitedTeamAdvancedCustom
Environment timelineBasicStandardIncludedCustom
Request replayBasicStandardPriorityCustom
Regression baselinesLimitedStandardAdvancedCustom
Artifact retentionLimited30 daysUnlimitedCustom
Team activity feedBasicTeamIncludedCustom
Run annotationsLimitedTeamIncludedCustom
Exportable reportsBasicStandardAdvancedCustom
Webhook eventsLimitedStandardAdvancedCustom
Incident linksLimitedTeamIncludedCustom
Historical searchBasicStandardAdvancedCustom
Status archive7 days30 daysUnlimitedUnlimited
Run ownershipBasicTeamIncludedCustom
Saved filtersLimitedStandardIncludedCustom
Timeline sharingLimitedTeamIncludedCustom
Audit timelineLimitedLimitedAdvancedCustom
AI diagnosis
AI failure summaryLimitedIncludedPriorityCustom
Root-cause hintsLimitedStandardPriorityCustom
Context-aware promptsBasicStandardAdvancedCustom
Last-green comparisonLimitedStandardPriorityCustom
Suggested remapsLimitedStandardAdvancedCustom
Schema explanationBasicStandardAdvancedCustom
Run summarizationBasicStandardPriorityCustom
Workflow generationLimitedStandardAdvancedCustom
Prompt controlsLimitedTeamAdvancedCustom
Sensitive-field maskingBasicTeamAdvancedCustom
Custom diagnosis rulesLimitedLimitedAdvancedCustom
AI handoff notesBasicStandardIncludedCustom
Spec draftingLimitedStandardAdvancedCustom
Error clusteringLimitedStandardPriorityCustom
Team prompt libraryLimitedTeamAdvancedCustom
AI usage controlsBasicStandardAdvancedCustom
Model routingLimitedLimitedAdvancedCustom
Private context windowsLimitedLimitedAdvancedCustom
Diagnostic exportsBasicStandardIncludedCustom
AI review queueLimitedTeamAdvancedCustom
Governance controls
Workspace rolesBasicTeamAdvancedCustom
Workspace permissionsBasicTeamAdvancedCustom
SSOLimitedLimitedAdvancedCustom
Audit logsLimited30 daysUnlimitedCustom
Data retention policyBasicStandardAdvancedCustom
Environment secretsBasicStandardAdvancedCustom
Deployment controlsLimitedLimitedAdvancedCustom
Domain controlsLimitedLimitedAdvancedCustom
SCIMLimitedLimitedLimitedCustom
Legal holdLimitedLimitedAdvancedCustom
Priority supportBasicStandardPriorityCustom
Workspace templatesBasicTeamAdvancedCustom
Approval policiesLimitedTeamAdvancedCustom
Compliance exportsLimitedLimitedAdvancedCustom
Private deploymentLimitedLimitedLimitedCustom
Custom onboardingLimitedLimitedPriorityCustom
Security reviewLimitedLimitedAdvancedCustom
Admin analyticsBasicTeamAdvancedCustom
Dedicated workspace controlsLimitedLimitedAdvancedCustom
Enterprise success planLimitedLimitedLimitedCustom

Why teams switch

Designed for execution-heavy API teams that need clarity at scale

From context propagation to failure diagnosis, every layer is tuned for engineering speed, shared visibility, and trustworthy debugging.

10K+

test runs visualized

Keep every execution in one place, from urgent incident traces to long-lived regressions.

500+

teams collaborating

Shared workspaces, comments, and status streams keep engineering and QA aligned.

90%

faster debugging

Use context-aware history and AI explanations instead of manually replaying the chain.

100%

readable workflow files

.flow.md serves engineers, reviewers, and AI analyzers without extra translation layers.

Start building

Build smarter API test workflows with your team

Start with an open-source workflow foundation, then scale into team collaboration, execution history, and AI-powered diagnostics without changing tools.

Start Free

Open-source at the core, with room for stronger governance as API teams grow.