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FastCopy VS Keylight.dev

Compare FastCopy VS Keylight.dev and see what are their differences

FastCopy

FastCopy is the fastest copy, delete, & sync software on Windows.

Rating
0 reviews
Alternatives Is it good?
Keylight.dev

The simplest way to license your app.

Rating
5.0 · 1 review
Pricing
Open source Freemium $19 / Monthly (Up to 2000 licenses active.)
Alternatives Is it good?
Monitask
Employee Monitoring Software with Screenshots, Internet, Activity and Time Tracking sponsored
Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

Which is more popular?

Based on our record, Keylight.dev should be more popular than FastCopy. It has been mentioned 4 times since March 2021.

social mentions
1 vs 4
File Management popularity
100% vs 0%
alternatives listed
79 vs 1

Base details

Website, pricing, platforms and company facts side by side.

FastCopy
Keylight.dev
Website fastcopy.jp keylight.dev
Pricing —
Open source Freemium $19 / Monthly (Up to 2000 licenses active.) Official pricing
Platforms —
Web
Company — Startup from Belgium · 1 - 9 employees · 2026
Listed in
File Management File Sharing File Sharing And Backup Data Replication +1
Developer Tools Software Development License Management Productivity Tech Web App Tool +4

About FastCopy and Keylight.dev

In their own words, as submitted to SaaSHub.

FastCopy
Keylight.dev

No description of FastCopy yet.

Keylight sits between your payment provider and your app. Licenses, activations, customers, and usage all live here. Switch providers, or run several, without shipping a new build.

Read more about Keylight.dev

Features and specs

What each product offers, as listed by its team.

FastCopy 6 features
Keylight.dev 16 features
  • Speed
    FastCopy is well-known for its high-speed copying capabilities, often outperforming standard file copy tools.
  • Verification
    The software includes an option for verifying copied files, ensuring data integrity after the transfer.
  • Customization
    Users can customize copy operations to suit their needs, including options for buffer size and operation mode.
  • Error Handling
    FastCopy provides detailed error reporting and logs, making it easier to identify and resolve issues during file transfers.
  • Portable Version
    A portable version of FastCopy is available, allowing users to run it from a USB drive without installation.
  • Compatibility
    Compatible with a wide variety of Windows operating systems, from older versions to the latest releases.

Possible disadvantages

  • User Interface
    The user interface is somewhat dated and may not be intuitive for beginners.
  • Lack of Advanced Features
    While it excels at file copying, FastCopy lacks some of the more advanced features found in competitor tools, like file synchronization.
  • Limited Support
    Support and documentation are limited, which can make troubleshooting more difficult for less experienced users.
  • No Mac/Linux Versions
    FastCopy is only available for Windows, leaving users of other operating systems without a native option.
  • Learning Curve
    The array of options and settings can be overwhelming for new users, requiring time to learn and configure properly.
  • License Management
    Create, validate, revoke, and manage software licenses from one dashboard.
  • Device Activations
    Limit how many devices can use a license and manage individual activations.
  • Offline Access
    Keep apps working securely without a constant internet connection using signed offline leases.
  • License States
    Handle trial, free, paid, expired, limited, and grace-period access through one consistent state.
  • Payment Provider Integrations
    Connect Stripe, Paddle, Lemon Squeezy, Polar, Gumroad, and other payment platforms.
  • Provider Independence
    Change payment providers or use multiple providers without rebuilding your app’s licensing system.
  • Swift SDK Integration
    Add licensing to macOS and iOS apps using a native Swift package.
  • Secure License Validation
    Protect license data with cryptographic signatures and tamper-resistant validation.
  • Trials and Free Tiers
    Configure trials, free plans, fallbacks, and upgrade paths without building custom logic.
  • Customer Dashboard
    View licenses, customers, devices, activations, plans, and access status in one place.
  • License Analytics
    Track activations, active licenses, usage, and customer activity.
  • Key Rotation
    Rotate SDK signing keys without breaking older application versions.
  • Webhook Synchronization
    Convert payment, renewal, refund, cancellation, and subscription events into license updates.
  • Device-Bound Storage
    Store license data securely on the customer’s device without unnecessary Keychain prompts.
  • REST API
    Connect custom backends, checkout systems, and internal tools to Keylight.
  • Agentic Orchestration
    CLI usable by AI Agents to run the whole setup and more.

Analysis

An editorial look at what each product does well and who it suits.

FastCopy
Keylight.dev

No analysis of FastCopy yet.

Overall verdict

  • I don't have verified, up-to-date information about Keylight.dev specifically, so I can't confirm its quality, features, or reliability. It may be a newer or niche tool that isn't well-documented in my training data. I'd recommend checking recent user reviews, the official website's documentation, and community forums (like GitHub, Reddit, or Twitter) for firsthand feedback before making a decision.

Why this product is good

  • Unable to verify specific features, pricing, or performance claims for this product
  • No confirmed user reviews or independent testing data available
  • Cannot confirm company legitimacy, support quality, or security practices without direct verification

Recommended for

  • Users willing to conduct their own due diligence by visiting the official site directly
  • Developers who can test the product via a free trial or demo before committing
  • Anyone who checks third-party review sites, GitHub issues, or community discussions for real user experiences

Videos

Walkthroughs and reviews on video.

FastCopy 4 videos + Add
Keylight.dev 0 videos + Add

Windows 8.1 vs UltraCopier vs Teracopy vs SuperCopier4 vs ExtremeCopy vs FastCopy

More videos

  • - FastCopy, SuperCopier, TeraCopy, UltraCopier and Copy Handler Speed Comparison (2021)
  • - Slow Copying in Windows 11? Try FastCopy to copy your files.
  • - GS RichCopy 360 VS. FASTCOPY Performance Review

No Keylight.dev videos yet. You could help us improve this page by suggesting one.

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
FastCopy
Keylight.dev
100% 100%
File Management
0% 0%
0% 0%
Tool
100% 100%
100% 100%
File Sharing
0% 0%
0% 0%
Productivity
100% 100%

Questions & Answers

As answered by people managing FastCopy and Keylight.dev.

What makes your product unique?

Keylight.dev's answer:

Keylight keeps app licensing separate from payments. You can use Stripe, Paddle, Lemon Squeezy, Polar, Gumroad, or your own checkout without tying your app to one provider.

It handles license keys, device activations, trials, free tiers, offline access, grace periods, and signed license state through one SDK.

Why should a person choose your product over its competitors?

Keylight.dev's answer:

My goal is to make all apps work with Keylight. So all of your licenses, from any types of apps, is going through Keylight for analytics, customer portal, support, ...

Most licensing tools are bundled into a payment provider. Keylight is built as an independent licensing layer.

That means you can change payment providers, sell through multiple platforms, or change your pricing model without rebuilding licensing inside your app.

It also gives developers a ready-made SDK and dashboard instead of requiring them to build and maintain their own licensing backend.

How would you describe the primary audience of your product?

Keylight.dev's answer:

Keylight is primarily built for independent developers and software companies selling apps directly to customers.

Its main audience includes:

macOS and iOS developers Web app and SaaS developers Developers selling outside app stores Teams migrating from a payment provider’s built-in licensing Developers who need trials, device limits, offline access, and license analytics

What's the story behind your product?

Keylight.dev's answer:

Keylight started because I kept rebuilding the same licensing systems for different apps: license keys, trials, activations, offline access, device changes, and all the edge cases that come with them.

I also did not want licensing to be controlled by whichever payment provider an app happened to use.

So I built Keylight as a standalone layer between the app and the payment provider. Payment platforms send events to Keylight, and the app receives one consistent license state through the SDK.

Who are some of the biggest customers of your product?

Keylight.dev's answer:

That's confidential.

Which are the primary technologies used for building your product?

Keylight.dev's answer:

Swift and Swift Package Manager for the Apple SDK Rust SDK / JS SDK / C# SDK / C++ SDK TypeScript React Next.js Stripe Connect and payment-provider webhooks Cryptographic signatures for secure, offline-capable licenses REST APIs for application and provider integrations

User comments

Share your experience with using FastCopy and Keylight.dev. For example, how are they different and which one is better?

Log in or Post with

Reviews and articles

External articles and on-site reviews we used to compare the two products.

FastCopy no reviews yet
Keylight.dev 5.0 · 1 review

View more

Social recommendations and mentions

Recommendations tracked on public social media and blogs since March 2021.

FastCopy 1 mention
Keylight.dev 4 mentions
  • Copy-Item is 27% slower than File Explorer
    It's fortunately been years since I have used Windows, but it looks like the old staples are still ahead of the curve: https://fastcopy.jp/ https://www.codesector.com/teracopy (I have certainly forgotten at least one...). - Source: Hacker News / 10 months ago
  • How offline license activation actually works
    You don't want to hand-roll Ed25519 and lease parsing. Most licensing SDKs hide this behind a couple of calls. With Keylight, for example, the offline path collapses to: activate once, then a local checkOnLaunch() that verifies the lease... - Source: dev.to / 3 months ago
  • I compared the licensing tools for my indie Mac app — the honest breakdown
    Full disclosure: I now build Keylight, so weigh this accordingly — I'm telling you the seam it's designed for, not that it wins every row. - Source: dev.to / 3 months ago
  • How to add license keys to a SwiftUI macOS app (in under an hour)
    Full docs and the free tier are at keylight.dev. If you're on Tauri or Electron instead of native Swift, the same SDK pattern exists in JS/Rust. - Source: dev.to / 3 months ago

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Alternatives to FastCopy and Keylight.dev

When comparing FastCopy and Keylight.dev, you can also consider the following products.

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