Eight months. Six paid subscriptions. Four successful replacements and two failures - that's the honest result from a freelancer who ran a methodical test of whether AI tools could replace specific software they were paying for month to month.
The clearest win: Grammarly at $12/month. Both Claude and ChatGPT catch grammar issues and flag tone problems well enough that paying for a dedicated grammar tool stopped making sense. Large language models - the AI systems behind chatbots - were trained on enormous amounts of written text, and catching a misplaced comma or awkward phrasing is genuinely within what they do well. After actually testing it, the subscription became hard to justify.
But two of the six replacements didn't hold, which is the part that actually matters. The pattern here is neither "AI replaces everything" nor "AI replaces nothing" - it's more specific, and specificity is exactly what most AI-tool advice skips.
The Category That Actually Gets Replaced
Grammar and writing polish tools are the lowest-hanging fruit. Grammarly's core function - catching errors, suggesting cleaner phrasing - is something any capable chatbot handles competently. The same logic applies to tools built around summarizing, drafting, reformatting, or editing text. If the tool's core job is language work, there's a real case for replacement.
Tools built around integrations, persistent data, or structured workflows are a different story. A general-purpose AI assistant like Claude or ChatGPT doesn't know what you worked on last week unless you tell it. It doesn't sync with your calendar, remember a specific client's preferences, or update a shared document automatically. The two failed replacements almost certainly sat in this category - tools that did something structural, not just something language-based.
The Math Only Works If You Stack It
Replacing a $12 Grammarly subscription with ChatGPT Plus at $20/month isn't savings by itself. The cost consolidation argument only works if one AI subscription substitutes for multiple line items simultaneously. When that stacks up across four or five tools, the numbers get interesting. When it replaces only one tool that cost less than the subscription, you've made the budget worse.
The 8-month timeline is what makes this more useful than the usual "I tried AI for two weeks" take. Actual habits settle after a few months. You find out whether the replacement genuinely works or whether you quietly started looking for the original tool again after the novelty faded.
Four out of six replacements holding after eight months suggests AI can absorb a real portion of a freelancer's software stack - just not all of it, and not without knowing which category each tool belongs to before you cancel the subscription.