API
Configuration / callbacks
flutter_otp_kit
A focused OTP toolkit for input states, validation, timers, paste/autofill behavior, masking, customization and integration.
PackageFlutter / Dart
CoreInput / Validation
StateTimers / Auto-submit
ModelOpen source
482
00 / 09Focused problem
Chapter 00
06 / OTP KIT
06 / OTP KIT
Focused problem
A small interaction can still deserve a proper system.
OTP input looks trivial until real requirements arrive: lengths, character sets, paste, autofill, timers, validation, masking and accessibility.
Small interaction. Real state system.
A small interaction can still deserve a proper system.
A small interaction can still deserve a proper system.
Chapter 01
06 / OTP KIT
06 / OTP KIT
API
Focused packages need focused contracts.
The package API aims to expose important choices without forcing consumers through a framework-sized configuration surface.
State
Input / timer / validation
Behavior
Paste / autofill / masking
Integration
Product / accessibility
Chapter 02
06 / OTP KIT
06 / OTP KIT
Input states
State is the component.
Empty, focused, partial, complete, invalid and submitted states are explicit visual and behavioral states.
OTP KIT
in use.
Interfaces, states and developer tooling are shown as evidence of product behavior rather than a technology logo collection.
06Structure
you can inspect.
The visual connects what a user touches to the decisions underneath it.
OTChapter 03
06 / OTP KIT
06 / OTP KIT
Validation
The package provides behavior while product policy stays configurable.
Validation feedback should be clear without making every product rebuild the same interaction details.
01
Make boundaries visible
Prefer explicit modules, state and contracts over hidden magic.
02
Keep workflows operable
Architecture earns its place by helping real people use and change the system.
03
Design for change
Build enough structure to protect the product without premature complexity.
Chapter 04
06 / OTP KIT
06 / OTP KIT
Timers
Timing is part of the interaction contract.
Countdown and resend behavior are user-facing state and have to remain predictable across rebuilds.
Enter
Timing is part of the interaction contract.
Validate
Timing is part of the interaction contract.
Submit
Timing is part of the interaction contract.
Reset
Timing is part of the interaction contract.
Chapter 05
06 / OTP KIT
06 / OTP KIT
Paste / autofill
The best component removes friction quietly.
Paste and platform autofill can make OTP flows dramatically faster when integrated carefully.
OTP KIT
in use.
Interfaces, states and developer tooling are shown as evidence of product behavior rather than a technology logo collection.
06Structure
you can inspect.
The visual connects what a user touches to the decisions underneath it.
OTChapter 06
06 / OTP KIT
06 / OTP KIT
Masking
UI privacy is one layer, not the threat model.
Masking behavior supports product-specific privacy needs without becoming the only security boundary.
01
Make boundaries visible
Prefer explicit modules, state and contracts over hidden magic.
02
Keep workflows operable
Architecture earns its place by helping real people use and change the system.
03
Design for change
Build enough structure to protect the product without premature complexity.
Chapter 07
06 / OTP KIT
06 / OTP KIT
Accessibility
Accessibility belongs in the component contract.
Focus semantics, input behavior and readable error state should work for more users by default.
OTP KIT
in use.
Interfaces, states and developer tooling are shown as evidence of product behavior rather than a technology logo collection.
06Structure
you can inspect.
The visual connects what a user touches to the decisions underneath it.
OTChapter 08
06 / OTP KIT
06 / OTP KIT
Customization
Reusable does not mean visually generic.
Visual customization lets the package fit a product identity without requiring a fork.
API
Configuration / callbacks
State
Input / timer / validation
Behavior
Paste / autofill / masking
Integration
Product / accessibility
Chapter 09
06 / OTP KIT
06 / OTP KIT
Open source
Smaller scope can still demand high ownership.
A small package is a test of restraint: solve one thing well, document it and avoid expanding into an unnecessary framework.
Small interaction. Real state system.
Smaller scope can still demand high ownership.
Smaller scope can still demand high ownership.