App Overview

Spanish SFST icon

Spanish SFST

Jacob Capito · Utilities

Spanish SFST is a practical, reliable tool built to help law enforcement officers administer Standardized Field Sobriety Tests (SFST) in Spanish

$2.99 · In-app purchases

PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.6
9 ratings · Top 15%

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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What's included16 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Spanish SFST: map the core Utilities workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Expand vocabulary database with user-generated content.

Assumption to check: Limited vocabulary options compared to competitors

Validate with people who use this workflow before building.

Hypothesis 2

Add quizzes and games for better engagement.

Assumption to check: Lack of interactive features

Validate with people who use this workflow before building.

Hypothesis 3

Introduce forums or chat for users to practice together.

Assumption to check: No community or social features

Validate with people who use this workflow before building.

Hypothesis 4

Use higher quality audio recordings for better learning.

Assumption to check: Limited audio quality for pronunciation

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

Spanish SFST is a practical, reliable tool built to help law enforcement officers administer Standardized Field Sobriety Tests (SFST) in Spanish. By delivering clear, accurate translations, the app bridges language barriers, supports effective communication, and ensures fair, consistent testing in diverse communities. Officers can easily play spoken instructions aloud in Spanish, providing clarity for individuals being tested while maintaining accuracy in the process. With streamlined navigation and step-by-step guidance, Spanish SFST covers every component of the field sobriety tests. Key features include: - Audio prompts for each instruction - Spanish Miranda warning FAQ section to address common questions Whether used during roadside assessments or in training, Spanish SFST empowers officers with the tools they need to conduct sobriety testing with confidence, efficiency, and fairness. Case law supporting the usage of this app: Wisconsin v Alejandro Herrera Ayala: The Wisconsin Court of Appeals addressed the admissibility of SFSTs administered in Spanish. The court found that the SFSTs were administered properly according to NHTSA guidelines. It was established that Ayala understood the instructions given in Spanish, and there was no evidence suggesting that the language of administration had compromised the reliability of the tests. Therefore, the court upheld the admissibility of the SFST results, highlighting that proper procedural compliance and the suspect’s comprehension were the key factors, not the specific language used. United States v. Horn: This case highlights the importance of administering SFSTs in strict accordance with NHTSA standards, focusing on the scientific reliability and proper execution of the tests rather than the language used. It serves as an example where adherence to standardized procedures can validate test results in any language, including Spanish​. Rodriguez v. Texas (2013): This case involved the admissibility of SFSTs, emphasizing that the proper administration of the tests according to established protocols is crucial. The language of administration, including Spanish, does not impact the admissibility as long as the tests are conducted correctly​.

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Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

SUGGESTED BUILD STACK
React Native
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BUILD KIT DIFFICULTY
Starter

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.