flutter_password_strength

Package Overview

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A Flutter package that evaluates password strength in real time, providing feedback on complexity and security. It supports Android, iOS, Web, macOS, Windows, and Linux, making it highly versatile for cross-platform applications. The checker analyzes passwords based on criteria like length, character variety, and common patterns, helping users create stronger credentials. It integrates seamlessly into forms and can be customized to fit various design needs. Ideal for apps requiring secure user authentication.

Use cases

User registration forms
Password validation in login screens
Security feedback during account setup
Compliance with password policies
Real-time strength indicators in form fields

Key features

Real-time strength assessment
Cross-platform compatibility
Customizable scoring rules
Supports multiple platforms
Simple integration with TextFormField
Visual feedback for password quality

Suitable for

Apps requiring strong password enforcement
Developers building secure authentication flows
Educational apps teaching password safety
Enterprise-level app development
UI/UX designers needing interactive form feedback

Considerations

May require customization for strict enterprise policies
Does not enforce password rules by default
Limited to strength analysis, not storage or hashing
Depends on client-side logic only
No built-in support for password history or reuse checks

Original README

Original README snapshot from the linked source repository. Visit the repository for the latest content.

A password strength checker for flutter.

Features

Linear strength indicator.
Customise colors, borders, etc.

Screenshot

Usage

  import 'package:flutter_password_strength/flutter_password_strength.dart';

  FlutterPasswordStrength(
    password: _password, 
    strengthCallback: (strength){
      debugPrint(strength.toString());
    }
  )

Arguments

Arguments	Default	Type	Description
password	required	String	Password
width	null	double	Strength bar width
height	5	double	Strength bar height
strengthColors	null	TweenSequence	`0.0 ~ 0.25 : red, 0.26 ~ 0.5 : yellow, 0.51 ~ 0.75 : blue, 0.76 ~ 1 : green`
backgroundColor	Colors.grey	Color	background for strength bar
radius	0	double	Strength bar radius
duration	milliseconds: 300	Duration	Animation duration
strengthCallback	null	`void Function(double strength)`	Strength callback, return between 0 to 1

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