TL;DR: I cancelled Grammarly Premium, Copy.ai, Writesonic, Hemingway App, Calendly Premium, Mailmodo, and a social scheduling tool over 6 months. Total saved: $147/month. The replacements are specific ChatGPT prompts — not "just use AI" generic advice. Sharing all 7 below, free.
When you test 90+ AI tools seriously, you notice something nobody says out loud: a lot of paid tools are just wrappers around a prompt you could write yourself.
Not all of them. Some are genuinely engineered (workflow automation, structured database tools, tools with real integrations). But a surprising number of "AI writing and productivity" tools are essentially: a clean UI on top of an API call, plus a marketing page telling you this is the only way to do the thing.
Over 6 months, I cancelled 7 subscriptions one by one and replaced each with a ChatGPT prompt I keep in a Notion doc. Here is the full breakdown, with the actual prompts.
The savings table first
| Tool I cancelled | What I paid | Replaced by |
|---|---|---|
| Grammarly Premium | Prompt #1 | |
| Copy.ai Pro | Prompt #2 | |
| Writesonic | Prompt #3 | |
| Hemingway App | Prompt #4 | |
| Calendly Premium | Prompt #5 | |
| Mailmodo | Prompt #6 | |
| Publer (social scheduling) | Prompt #7 | |
| Total saved | $147/mo ($1,764/yr) | ChatGPT Plus: $20/mo |
Net cost with ChatGPT replacing all of them: $20/month vs $167/month before. That is an 88% reduction in AI tool spend.
Worth noting before I give you the prompts: the quality of replacement varies. Some are 95% replacements (Grammarly, Hemingway). Some are 80% (Copy.ai — dedicated marketing copy tools are still better for high-volume campaigns). I will note the delta honestly for each one.
The 7 replacement prompts
1. Replacing Grammarly Premium ($30/mo) — Saved $30/mo
Grammarly Premium checks clarity, tone, engagement, and delivery. It also rewrites. The free version handles basic grammar. Premium's main value is its rewrite suggestions and tone detection.
This prompt replicates that by giving you an explicit editorial pass with the same categories:
Proofread and improve the following text. Focus on:
1. Grammar and spelling (fix all errors)
2. Clarity (flag any sentence that requires re-reading to understand)
3. Conciseness (cut unnecessary words without losing meaning)
4. Tone (identify the current tone and flag if anything sounds off for a professional B2B context)
5. Passive voice (rewrite passive constructions in active voice where possible)
Return the full revised version, then a brief list of the changes made and why.
Text to edit: [paste your text]
Replacement quality: 90%. The main thing Grammarly does better is inline real-time editing as you type. For polishing passes before sending, this prompt is equivalent or better.
2. Replacing Copy.ai Pro ($49/mo) — Saved $49/mo
Copy.ai's value is its 90+ templated "workflows" for marketing copy: product descriptions, cold email sequences, blog intros. The problem: every output sounds like every other Copy.ai output, because thousands of users are running the same templates.
This prompt gives you the same templates but with your specific context baked in:
Write [FORMAT: product description / cold email sequence / blog intro / landing page section] for [PRODUCT/SERVICE: describe it in 2 sentences].
Context:
- Target audience: [their job, pain, and what they want - one sentence]
- Tone: [e.g. confident and direct / warm and helpful / provocative and edgy]
- Key benefit to lead with: [the single most important outcome the buyer cares about]
- Things to avoid: [e.g. cliches, AI buzzwords, passive voice, sounding corporate]
Output format: [e.g. 3 variations / 1 final version / 5-email sequence with subject lines]
Do not use these phrases: "game-changing", "revolutionary", "in today's world", "streamline", "leverage".
Replacement quality: 80%. For high-volume marketing copy teams, Copy.ai's speed still wins. For solo freelancers, this prompt produces better-differentiated copy because your context is specific.
3. Replacing Writesonic ($19/mo) — Saved $19/mo
Writesonic is a blog post generator. Put in a keyword, get a 1,500-word article. The quality has improved in 2026. The problem: every article follows the same H2/H3 outline structure and Google is getting good at detecting this pattern.
Write a 1,500-word article on [TOPIC/KEYWORD].
Important: do NOT use a generic H2 structure. Instead, organize it as [CHOOSE ONE: a problem-solution narrative / a numbered experiment log / a case study with real numbers / a contrarian argument with evidence].
Requirements:
- Hook (first 3 sentences must make the reader want to continue)
- One specific, counterintuitive insight that most articles on this topic miss
- Real examples or data points (state as estimates if you lack exact figures)
- One section titled "What I would do differently" or equivalent honesty
- CTA at the end pointing to [YOUR PRODUCT/SERVICE URL]
- No filler. Every paragraph must earn its place.
Replacement quality: 85%. Writesonic's advantage is SEO scoring (Surfer integration). For quality writing, this prompt wins.
4. Replacing Hemingway App ($20 one-time)
Hemingway checks for sentence complexity and gives a readability grade. Worth having in your prompt toolbox because it is faster than opening another app:
Analyze the following text for readability. Report:
1. Estimated Flesch-Kincaid grade level
2. Sentences over 25 words - list them
3. Passive voice instances - list and suggest active rewrites
4. Adverbs that weaken the writing - list and suggest stronger verbs
5. Overall readability verdict (Easy / Medium / Hard)
Then provide a rewritten version fixing all flagged issues while keeping the meaning intact.
Text: [paste]
Replacement quality: 95%. Hemingway has a nicer visual UI with color-coded highlights. The analytical output from this prompt is equivalent and sometimes more actionable.
5. Replacing Calendly Premium ($10/mo) — Saved $10/mo
Calendly Premium handles routing rules, team scheduling, and integrations. For solo freelancers sending scheduling links, the free tier already does most of it. The remaining use case I was paying for: scheduling emails that handle reminders, rescheduling scripts, and timezone clarification.
I need to [CHOOSE: schedule an initial call / confirm a meeting / handle a reschedule request / send a pre-meeting reminder] with [CLIENT TYPE].
My timezone: [yours]
Their timezone: [theirs, or "unknown"]
Meeting purpose: [2-3 words]
My tone with this client: [formal / friendly professional / casual]
Write the email. Include:
- A subject line
- A clear time proposal with timezone specified
- A scheduling link placeholder [CALENDLY_LINK] or 3 slots to pick from
- A 1-sentence agenda so they arrive prepared
- Under 100 words total
Do not open with "I hope this email finds you well."
Replacement quality: 70%. This replaces the writing/communication part only. Actual scheduling automation still needs a tool. If you manually schedule 2-3 calls per week, downgrade to free and use this prompt for the emails.
6. Replacing Mailmodo ($25/mo) — Saved $25/mo
Mailmodo is email marketing focused on AMP interactive emails. For a solo newsletter under 1,000 subscribers, it is overkill. The use case I was paying for: email copy generation with subject line variants.
Write a newsletter issue for [TOPIC]. My newsletter is for [AUDIENCE]. My tone is [e.g. concise and direct / warm and conversational / slightly provocative].
Structure:
- 3 subject line options (A/B/C): one curiosity-gap, one direct benefit, one provocative
- Preview text (under 90 characters)
- Opening hook (2-3 sentences max - no "in today's newsletter")
- Main body (~300 words: one insight or story with a concrete takeaway)
- One practical recommendation with a brief why
- CTA (what you want readers to do)
Keep the whole issue under 500 words. Dense, not padded.
Replacement quality: 85%. Mailmodo's actual sending infrastructure still needs a real email tool (I use Buttondown, free up to 100 subscribers). But for content generation, this prompt is equivalent to Mailmodo's AI writing features.
7. Replacing a social scheduling tool ($14/mo) — Saved $14/mo
Social scheduling tools (Publer, Buffer, Later) are useful for multi-platform scheduling and content calendars. For a freelancer posting 1-2 times per day, the main value is usually the "repurpose one piece into multiple formats" feature:
I have the following piece of content: [PASTE THE ORIGINAL]
Repurpose it into all of the following formats. Keep the core insight intact. Adapt the format and length for each platform:
1. X (Twitter) thread - 5 tweets, each under 280 characters, first tweet is the hook
2. LinkedIn post - under 300 words, short punchy lines, ends with a question
3. Threads post - under 200 words, casual conversational tone
4. YouTube Short script - under 60 seconds, spoken conversationally, ends on a CTA
5. Newsletter excerpt - 2 paragraphs, links to original for full context
For each: include a suggested hashtag or two. Do not repeat the same phrasing across platforms.
Replacement quality: 75%. Scheduling tools still win on automation and analytics. But if you are paying $14/month mostly for the AI repurposing feature, this prompt is a full replacement.
What I kept (and why)
To be honest about the other side: there are tools I tested and absolutely kept, even at full price.
- Notion: A database is a database. No prompt replaces the actual structure of a project management system.
- Zapier (free tier): Automation between apps is not replaceable by a prompt. The integrations are the value.
- ChatGPT Plus ($20/mo): This is the tool replacing 7 other tools. It is doing more than it costs.
- Perplexity Pro: Real-time web search with citations is something you cannot replicate in a standard ChatGPT prompt. For research, Perplexity stays.
The pattern: tools with unique integrations, real-time data access, or database structure kept. Pure AI writing and generation tools got cancelled.
The honest caveat
These prompts require effort to write, refine, and save. The tools I cancelled were convenient because you did not have to think about the prompt — the product already encoded one for you. That convenience has a real cost in dollars.
The trade-off: pay for the convenience, or spend 30 minutes building a prompt library you use forever. For most of these, 30 minutes to build the prompt saves $200+ per year. That math is hard to ignore.
If you are paying for any AI writing or copy tool in 2026, check whether a well-structured ChatGPT prompt would do the same job. For 7 of the tools I was paying for, it did. The total saving across 6 months was over $800.
The 7 prompts above are a sample. The full prompt pack at AI Tools Insider has 75 prompts specifically for freelancers: proposals, client email sequences, scope creep handling, project retros, onboarding scripts, and more. All tested on ChatGPT and Claude.
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