The honest trade-off
Paid LinkedIn tools sell convenience: scheduling, analytics, voice-matching that improves over time. What they're built on, underneath, is a general-purpose language model with a LinkedIn-specific wrapper around it. If you're willing to build that wrapper yourself — through custom instructions and a small library of reusable prompts — you can get most of the writing quality without the monthly fee.
What you give up: no scheduling, no analytics, no automatic voice-learning over time. You're trading convenience for cost.
Step 1 — Set up custom instructions
Both ChatGPT and Claude let you save persistent instructions that apply to every conversation. Use this once, and every future prompt benefits from it. A good starting template:
- Who you are: your role, industry, and what you want to be known for
- Your voice: 3–4 adjectives describing your tone (e.g. "direct, a little dry, no corporate buzzwords")
- What to avoid: specific phrases or structures you've noticed sound generic ("In today's fast-paced world...", excessive emoji, hashtag spam)
Step 2 — Use these starting prompts
Copy and adapt these. Replace the bracketed parts with your specifics.
- Story post: "Turn this experience into a LinkedIn post using a personal story structure: situation, tension, turning point, lesson. Keep it under 200 words. Experience: [describe what happened]"
- Opinion post: "Write a LinkedIn post arguing this point of view, written for [your audience]. Open with a contrarian or surprising first line. Point of view: [your take]"
- Listicle/tips post: "Turn these into a numbered LinkedIn post with one-line explanations for each point. Points: [your list]"
- Repurpose from long content: "Read this [article/transcript] and pull out the single most interesting insight. Write a LinkedIn post built entirely around that one idea, not a summary of everything. Source: [paste content]"
Step 3 — Always edit the first line
The first one to two lines are what shows before someone clicks "see more" — this matters more than anything else in the post. AI-generated openings tend to be generic ("Here's what I learned..."). Rewrite this line yourself every time, even if you use AI for everything else.
When to upgrade to a paid tool
This approach works well until volume or consistency becomes the bottleneck. If you're posting daily and the manual prompt-and-edit cycle is eating real time, that's the signal to look at Supergrow for voice-matching at scale, or Taplio if you also need scheduling and analytics in the same place.