Build authority on LinkedIn, on autopilot.

There are two LinkedIn growth motions: posting your own content, and commenting on other people's. Most personal branding advice obsesses over the first. The second is where the actual leverage lives.

Consider the math. Your post reaches some percentage of your existing followers. A thoughtful comment on a 100k-follower creator's post gets shown to their 100k followers - most of whom you don't have access to otherwise. Show up in 5 of those conversations a day, in your niche, with comments that add real value, and your name compounds.

The data backs this up. Founders running consistent commenting motions report follower growth rates of 50-200 new followers/week within 60 days, against the LinkedIn baseline of 5-15/week from posting alone. Profile views climb 3-5x. DMs from people who've “been seeing your name everywhere” become routine.

Commentify has two distinct modes. This page covers personal branding mode - different defaults than sales agent mode (which is built around ICP targeting and pipeline outcomes).

The agent finds posts from top creators in your niche, drafts thoughtful comments in your voice, and publishes them on a natural cadence. You set up the targeting once. The system runs.

1. Voice model fine-tuned on your writing

The most important feature for this use case. Your personal brand depends on every comment sounding like you. Generic AI tools fail this test - sophisticated readers identify templated comments instantly, and the comment becomes a negative signal rather than a positive one.

Commentify trains a model on your actual writing samples. Output picks up your sentence rhythm, vocabulary, humor, depth, structure.

2. Targeting that matches how you'd build your brand manually

Pick the 30-50 creators in your niche whose audiences you want exposure to. Add keyword filters for the topics you want to be associated with. Add geographic filtering if you're building presence in a specific market. The agent only comments where it makes strategic sense.

3. Tone profiles for personal-brand-appropriate commentary

• ✓Thoughtful peer-to-peer commentary, not transactional
• ✓Adds substance - counterpoint, expansion, lived-experience anecdote - rather than agreement
• ✓Avoids overt sales angles or product mentions
• ✓Prioritizes comments that other commenters will reply to (compound reach)

4. Pricing that doesn't bleed your runway

$19/mo Starter, $39/mo Full. Most “LinkedIn growth” tools that try to do this charge $39-$199/mo (Taplio) or $59/mo (PowerIn). Commentify is the cheapest serious tool in the category - which matters when personal branding is a long compounding investment, not a 30-day campaign.

A founder building authority in the AI agent space sets it up like this:

Niche definition

• Topics: AI agents, LLM tooling, agent infrastructure, dev tools
• Geographic interest: global, with slight bias toward US tech ecosystem

Creator targeting

Pick 40 creators in your niche - researchers, founders of related tools, prominent VCs, technical writers whose work you respect.

Voice training

• Upload 10 of your most representative comments
• Optional: paste 2-3 longer-form posts so the model gets your full voice range

Tone preference

Thoughtful, slightly contrarian, builds on the post rather than agreeing with it.

Volume

• Starter: ~12-15 comments/day across LinkedIn
• Full: higher volume + multi-platform if you also want X and Reddit presence

The fine-tuned voice model is what makes this work, but it's worth being explicit about what it produces.

Bad AI comments (generic tools)

Bad AI comments (slightly more sophisticated tools)

Good personal-brand comments (Commentify)

The difference: the third comment adds something to the conversation. It positions you as a peer with relevant experience, asks a real question, and gives the original poster a reason to reply. That's what makes the comment a positive signal for your brand instead of a negative one.

The fine-tuning is what makes this output possible without manual writing. The model has read your past comments, understands how you build arguments, knows what you'd reference from your experience. It writes in that mode.

For personal branding specifically, the comparison comes down to two things: voice quality (most important) and multi-platform coverage (matters if your audience is also on X or Reddit). Commentify wins on both at the lowest price.

Personal branding is a long compounding game. Pricing matters because you're paying every month for years, not a 30-day burst. Commentify being the cheapest serious tool in the category meaningfully changes the LTV math.

Personal branding mode works for

• ✓Founders building authority in their niche while running a company
• ✓Operators and senior ICs building career equity and optionality
• ✓Consultants and coaches whose audience size directly drives bookings
• ✓Investors and angels building deal flow through visibility
• ✓Newsletter writers and creators building cross-platform presence

It's not a fit for

• ✗Pure ghost accounts that have no first-party content of their own (the agent works alongside your own posts, not as a replacement for them)
• ✗Anyone unwilling to pick a niche - the targeting needs strategic focus to compound
• ✗Someone whose brand is built on hot takes and provocation (the model defaults toward thoughtful commentary; you can tune it sharper but it's not its strength)