App2Api Turns Mobile Apps into Documented AI APIs

Overview

A new tool called App2Api is aiming to bridge the gap between mobile application interfaces and the backend APIs that power them. By allowing users to describe desired workflows in plain English, the service captures the underlying network traffic and generates a standardized OpenAPI 3.1 specification. This process effectively turns opaque mobile apps into documentable, testable, and automatable API surfaces for developers and security professionals.

The platform is currently available in a free beta period. During this phase, users can submit applications they own or are authorized to test without providing credit card details or undergoing complex setup procedures. The service operates by driving a live emulator, capturing HTTPS calls, and tracing authentication chains to produce reusable scripts and documentation.

How It Works

App2Api differentiates itself from traditional web crawling tools by employing a goal-directed approach rather than a blind scan. Instead of dumping every endpoint an application happens to touch, the system focuses on a single, user-defined workflow. It walks through the process end-to-end to isolate the specific request chain required to achieve that goal.

The User Workflow

The process begins when a user sends an app bundle along with a plain-English description of the desired action. Examples include commands such as "trigger the loyalty lookup" or "add an item to my cart." Users may also need to provide credentials, which are handled with specific security constraints. These credentials are typed locally on the user's machine and are never sent to a language model, ensuring that sensitive authentication data remains private during the interaction.

Traffic Capture and Analysis

Once the goal is defined, a vision planner drives a live emulator toward the stated objective. As the emulator interacts with the app, App2Api captures every HTTPS call made during the session. When the target action is triggered, the system identifies the specific network request behind it. It then traces backward to reconstruct the full auth chain, including session bootstrapping, token generation, and attestation requirements.

Deliverables

Upon completion, the user receives a structured set of three files via email:

• flow.sh: A runnable shell script containing the full authentication chain. This allows the generated API call to be executed standalone in a terminal environment without requiring the mobile app itself.
• openapi.json: A complete OpenAPI 3.1 specification detailing the endpoints touched during the workflow. This can be dropped directly into existing developer tooling for integration or further development.
• owner-report.html: A shareable report summarizing the captured requests. This document is designed to be handed directly to teammates, stakeholders, or clients for review.

Every run hands back the same set — a call to run, a spec to build on, and a report to share. The focus is on providing functional artifacts rather than static screenshots.

Target Audience and Use Cases

The tool is primarily built for mobile teams, quality assurance (QA) engineers, and security testers. It addresses the common challenge where mobile applications rely on undocumented or hidden backend APIs that are difficult to access programmatically.

Mobile and Backend Teams

For developers building mobile applications, App2Api offers a way to document the real API surface of their own software. It can help identify undeclared endpoints and generate a contract that can be tested against with every new release. This ensures that frontend changes do not inadvertently break backend dependencies that were previously invisible.

QA and Automation

QA teams can leverage the tool to convert manual testing workflows into scripted, replayable calls. By generating a runnable script, testers can automate regression checks. The platform is also developing update monitoring features, which will alert teams the moment an app update changes the underlying API contract, potentially breaking existing automation scripts.

Security Testing

Security professionals can use App2Api to trace complex authentication flows and attestation mechanisms during penetration testing engagements. The generated owner report provides a clear audit trail of the requests made, which can be shared with clients to demonstrate security findings or verify compliance with authentication standards.

Current Limitations and FAQ

While the beta is open to the public, there are important restrictions and operational details that prospective users should understand.

Authorization Requirements App2Api is strictly for applications that the user owns or is explicitly authorized to test. The system includes an authorization confirmation step for every request. If the operators cannot reasonably believe the app is authorized for testing, the request will be declined. This policy is designed to prevent the misuse of the tool for unauthorized access or scraping of third-party applications.

Processing Time Because the service is in beta and runs requests manually on managed infrastructure, there is a delay between submission and receipt of results. Users are emailed the traced call once the run is complete. The wait time depends on the current queue volume, but users are advised not to resubmit requests while waiting.

Supported Apps The tool supports various login flows, including those requiring complex token exchanges. However, it does not support all applications. Some hardened apps that ship with certain integrity protections may fail to run within the emulator environment. In such cases, users are notified when the app cannot be processed.

Cost There is no cost to use the service during the beta period. The company runs the infrastructure and emails the results to users free of charge. Future pricing models have not yet been announced.

Market Context

The emergence of tools like App2Api highlights a growing need for better interoperability between mobile experiences and backend systems. As mobile applications become more complex, the disconnect between the user interface and the underlying API often creates bottlenecks for developers and security auditors. By converting these opaque interactions into standard OpenAPI specifications, the tool aims to bring the same level of documentation and automation usually reserved for web APIs to the mobile ecosystem.