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Spec-firstBuilt. Validated. Shipped.

Spec an AI agent.
Watch it run.

Describe your agent in plain English. Axtra specs it, validates it in a sandbox, and keeps it running. The code is yours.

See example backends

Pilot Seed

Start with lead enrichment. Replace it with any client backend.

POST /run

“Build a lead enrichment agent for an AI-agency client. Accept a lead JSON payload with email, company, role, website, and notes. Enrich the company profile, score buying intent from 0-100, explain the score, flag missing inputs, and return CRM-ready JSON with next_action.”

Returns

  • lead_score
  • company_profile
  • fit_reason
  • missing_inputs
  • next_action
Architecture & Validation

Built for agents. Validated to ship.

Typed schemas, predictable endpoints, sandbox validation, and clear deploy preflight. Generated backends are artifacts first; runtime endpoints exist only after deploy succeeds.

  1. 01

    Describe

    A typed backend, not a black box.

    The spec you approve compiles into FastAPI routes with Pydantic request/response schemas. Generated endpoints mount under the runtime API version.

    POST /api/v1/run
    ActionUseCaseAgent

    Any model can map it to its own tool-calling logic.

  2. 02

    Generate

    Built and checked inside an isolated sandbox.

    Each backend is packaged as a ZIP artifact, then validated in an isolated sandbox before you ever see it.

    • Endpoints
    • Schemas
    • Auth
    • Spec constraints

    All four run against actual execution, not just a lint check, before sign-off.

  3. 03

    Deploy

    Yours to keep, whether you host it here or not.

    Deployment starts once the artifact exists and your deployment credentials pass preflight.

    ZIP artifactDeploy preflightHosted runtime

    Export the ZIP any time — hosted deployment only continues while the artifact and active provider configuration stay valid.

Use AXTL when the backend contract matters.

Editors and app builders are useful. AXTL is narrower: reviewed spec, generated backend artifact, sandbox validation, and deploy or download handoff.

Code editors

Cursor, Codex, Claude Code

Best when you want hands-on control inside a codebase. You still own architecture, API shape, validation, and deploy handoff.

App builders

Replit, Lovable, Bolt

Best when you want an app preview quickly. Backend contracts and generated service ownership are usually secondary.

AXTL

Backend-first

Spec, artifact, validation, handoff

Best when the deliverable is a backend API package for an agent or automation workflow, not another chat transcript.

DecisionGeneral toolsAXTL
Primary deliverableEditor code, app preview, or hosted app shellGenerated backend artifact with download, validation, and deployment metadata
Source of truthConversation, editor state, or generated app structureReviewed ALMS spec before generation
Backend boundaryDepends on the project you write or the app builder outputFastAPI-style runtime with endpoint, usecase, action, and provider layers
Validation pathUsually manual run, build result, or preview checkSandbox validation result tied to the generated artifact
Change evidenceEditor history or app versioning if the tool supports itVersioned artifact history with validation, deploy, and log context
HandoffKeep editing, deploy the app, or export what the tool supportsDownload the ZIP or run deploy preflight before hosted deployment

AXTL does not try to replace your editor. It gives agent builders and automation teams a backend API artifact they can inspect, validate, trace through version history, download, or move toward hosted deployment.

Read the detailed comparison

Built for teams shipping agent backends.

AXTL fits when the deliverable is a working agent with a real API behind it, plus source and validation evidence a technical team can inspect.

Reviewed ALMS spec
Generated ZIP artifact
Sandbox validation result
Versioned evidence trail
Deploy preflight or download

Solo & small agency teams

Queued validation and an honest deploy preflight before anything ships, instead of finding out an agent broke at 3am.

Automation agencies

Package repeatable client workflows like lead enrichment, support actions, report APIs, webhook handlers, and CRM syncs.

In-house engineering teams

Customise business logic and integrations per team or client through an approved spec, without hand-forking the shared template.

Agency use case

Turn one client workflow into a spec, source artifact, validation result, and deploy or download decision.

Launch pricing, simple by design.

Signup is open. Start free, move to Builder when the workflow sticks, or step up to Studio for a bigger agent portfolio. Enterprise/BYOC starts with a conversation.

Free

Best for evaluating the spec-to-artifact flow before committing.

$0/month
  • 1 agent slot (draft and deployed combined)
  • 2 lifetime generations
  • 1 active deployment at a time
  • 100 agent calls/day
  • Download-ready artifact
  • No credit card required
Builder

Best for builders shipping AI agent backends regularly.

$29/month

Everything in Free, and:

  • 3 agent slots
  • Chat-to-Edit iteration (500k tokens per agent/month)
  • 15 generations/month
  • 90 deploy attempts/month
  • 1,000 agent calls/day
  • SQLite persistence included
Most popular
Studio

Best for agencies and teams running a portfolio of deployed agents.

$79/month

Everything in Builder, and:

  • 10 agent slots
  • 5× the Chat-to-Edit tokens (2.5M per agent/month)
  • 30 generations/month
  • 240 deploy attempts/month
  • 5,000 agent calls/day
Enterprise/BYOC

Best for teams needing private cloud or customer-owned deployment.

Everything in Studio, and:

  • Unlimited agents
  • Private architecture review
  • BYOC/runtime planning
  • Security and data review
  • Custom hosted-agent policy

Compare plans

Every limit across the self-serve tiers.

LimitFree$0Builder$29/moStudio$79/moEnterprise/BYOC
Agent slots1310Unlimited
Agent workspacesNot includedNot includedIncludedIncluded
Generation model accessStandardHigherBestCustom
Generations2 lifetime15 / month30 / monthCustom
Deployment allowance1 active at a time90 attempts / month240 attempts / monthCustom
Chat-to-Edit tokensNot included500k / agent / month2.5M / agent / monthCustom
Agent calls100 / day1,000 / day5,000 / dayCustom
SQLite persistenceNot includedIncludedIncludedIncluded
Download-ready artifactIncludedIncludedIncludedIncluded
One-click rollbackNot includedIncludedIncludedIncluded
Activity exportNot includedIncludedIncludedIncluded
Custom domainNot includedNot includedIncludedIncluded
Priority build queueNot includedNot includedIncludedIncluded
Priority supportBest effortBest effort24h, business days24h, business days

"Lifetime" is a one-time evaluation allowance per person or organization, not a permanent license. We can change Free tier allowances, with at least 30 days' notice to accounts already using them — see the Billing terms.

FAQ

Questions before you build.

The short version: AXTL is a spec-first backend generation pipeline, not a generic app builder or hidden chatbot wrapper.

What does AXTL generate?

A working agent packaged as a backend API, from a reviewed spec: workflow logic, endpoints, typed schemas, runtime code, validation checks, and deploy/download metadata.

Is AXTL a no-code app builder?

No. AXTL is not a drag-and-drop app builder. It generates agent workflow logic and its backend API from an approved spec as inspectable source code. Technical teams can review the source and validation evidence, download the artifact, and deploy it when the target runtime is configured.

How is this different from Cursor or Replit?

Those tools are broad coding environments. AXTL is narrower: spec-first backend generation, sandbox validation, and backend artifact handoff.

Do users own the generated code?

The product direction is code ownership and artifact handoff. Download and deploy behavior is explicit for every artifact version before you commit to either.

Can it deploy the backend?

The current platform supports deploy-preflight and deployment workflows where credentials/runtime are configured. Preflight reports what is missing instead of claiming a live endpoint.

Is signup open?

Yes. Create an account, start on the Free tier, and move to Builder when you need repeatable generation and deploy attempts. Enterprise and BYOC setups start with a conversation.

Get started

Ready to test a backend workflow?

Create an account, describe the workflow and expected API shape, and take the generated backend from approved spec to validated artifact — then deploy it or download the ZIP.

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