Chrome Extension · Powered by AI

Reply smarter
on LinkedIn.

SparkIn generates on-brand LinkedIn comments in seconds using OpenAI or Claude. Set your voice once — reply to anything.

Get SparkIn — $19See it in action
One-time payment · Lifetime access · Your own API key
Live Demo

See SparkIn in action

Click the AI Reply button inside the post below. Watch it generate a reply in real time.

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Sarah Chen · 2ndSenior Product Manager at TechCorp · Following3h · 🌐

We just wrapped our Q1 AI productivity review across 6 teams. The results were honestly surprising — teams using AI writing tools saw 3.2× higher LinkedIn engagement and reclaimed 40% of time previously spent on routine communication.

The real lesson? AI doesn't replace your voice. It amplifies it.

What's your experience with AI tools for professional communication? 👇

#AI #Productivity #Leadership
👍 247 · 💬 89 comments34 reposts
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SparkInAI
47Generated
31Sent
66%Send rate
5🔥Day streak
3M5T8W6T9F7S9S
GeneratedSent
Recent
Totally agree — async-first culture is the unlock. Once you eliminate the expectation of instant replies, deep work becomes default rather than exception.
2h ago · gpt-4o-mini
✓ sent
The 3.2× engagement stat is compelling, but I'd love to know the variance across industries. Have you seen this hold in B2B-heavy sectors as well?
yesterday · gpt-4o-mini
Totally agree — async-first culture is the unlock. Once you eliminate the expectation of instant replies, deep work becomes default rather than exception.
2h ago · gpt-4o-mini
✓ sent
The 3.2× engagement stat is compelling, but I'd love to know the variance across industries. Have you seen this hold in B2B-heavy sectors as well?
yesterday · gpt-4o-mini
PersonasSwitch between writing styles
AI ProviderChoose which model generates your replies
API KeyStored locally in your browser
Modele.g. gpt-4o-mini, gpt-4o, o3
TemperatureCreativity vs. consistency
Focused
Creative0.70
Behaviour
Auto-post commentClick Send automatically after generating
Include post imageSend the post photo to the AI for analysis
Works with
Features

Everything you need
to engage like a pro

Built for professionals who want to stay active on LinkedIn without spending hours on it.

One-click AI Reply

A SparkIn button appears on every LinkedIn post and comment box. Click once — your personalized reply is generated and ready to post.

Multiple Personas

Create personas for different contexts — founder mode, thought leader, casual. Switch instantly. Every reply sounds authentically you.

Thread Context Aware

When replying to a comment, SparkIn reads the full discussion thread — so your reply is relevant to the conversation, not just the post.

OpenAI & Claude

Use any model — GPT-5.4, GPT-5.3, GPT-4o, Claude Sonnet, Claude Haiku, o3, and more. Just type the model name. Always up to date.

Analytics Dashboard

Track how many replies you generate and post each day. A clean 7-day chart lives right in the sidebar.

Private by Design

Your API keys never leave your browser. No account required, no data collection, no cloud sync. Everything is stored locally.

How it works

Up and running in minutes

No complicated setup. Install, configure once, and start replying smarter.

1

Install & activate

Add SparkIn from the Chrome Web Store, enter your license key in the sidebar. Done in under 60 seconds.

2

Set your voice

Add your OpenAI or Claude API key and describe your writing style. Save once — SparkIn remembers it.

3

Click AI Reply

Browse LinkedIn normally. Hit "AI Reply" on any post or comment — a personalized reply is ready instantly.

Pricing

Simple, one-time pricing

Pay once, use forever. No subscriptions, no surprises.

Most Popular
SparkIn Lifetime
Full access to every feature. Bring your own API key. One browser profile, lifetime access.
$19
one-time payment
  • Lifetime license — pay once, own it forever
  • OpenAI & Anthropic Claude support
  • Unlimited AI replies (your API key)
  • Multiple personas
  • Thread context & post image analysis
  • All future updates included
Get SparkIn for $19
License key delivered instantly by email.
FAQ

Common questions

Everything you need to know before buying.

Yes — SparkIn uses your own API key from OpenAI or Anthropic. This means you pay directly for what you use (usually fractions of a cent per reply) and your data never passes through our servers. Most users spend less than $1/month on API costs.
SparkIn is a writing assistant — it generates text you review and manually post. It doesn't automate clicks, scrape data, or interact with LinkedIn's servers in any way. The risk profile is the same as using Grammarly or any other AI writing tool.
After purchase you receive a license key by email. Enter it once in the SparkIn sidebar and the extension is permanently unlocked on that browser. If you switch to a new computer or reinstall, contact support and we will reset it free of charge.
Any OpenAI or Anthropic model — GPT-5.4, GPT-5.3, GPT-5.2, GPT-4o, o3, Claude Sonnet, Claude Haiku, and any future release. SparkIn is model-agnostic — just type the model name in the settings field and it works immediately.
Yes — that's the core feature. You write a short description of how you communicate (your role, tone, what you value in a comment) and every reply SparkIn generates matches that voice. You can create multiple personas and switch between them.
Absolutely. If SparkIn doesn't work for you within 7 days of purchase, email us for a full refund — no questions asked.