The AI tool landscape has settled enough to make judgements possible. What follows is not a list of everything that exists — it is the seven categories where AI tools now reliably save more time than they cost.
1. Writing assistants for first drafts
The value is not in having AI write for you. It is in getting past the blank page. Give a model your outline and three bullet points per section, ask for a rough draft, then rewrite it properly. You keep your voice and skip the hardest twenty minutes.
2. Code completion and review
Modern code assistants are genuinely strong at boilerplate, test scaffolding and explaining unfamiliar code. Treat them as a fast junior colleague: excellent at volume, requiring review on anything that touches security, money or data.
3. Meeting transcription and summarisation
Automatic transcription plus summarisation turns an hour-long meeting into a structured record with decisions and owners. The discipline it imposes — actually writing down who agreed to do what — is worth more than the time saved.
4. Research synthesis
Tools that read documents for you are excellent at the first pass: finding the five relevant pages in a 200-page report. They are much weaker at nuance and sourcing. Always verify any specific claim before you publish it.
5. Image and design generation
For placeholder art, blog headers and social assets, generated images have moved from novelty to practical. The key skill is prompt specificity — describe the composition, lighting and style, not just the subject.
6. Data analysis and spreadsheet help
Natural-language spreadsheet tools can write formulas, build pivot tables and flag anomalies. They are most useful when you already know roughly what you want to see and need the syntax.
7. Customer support triage
Classifying, routing and drafting responses to support tickets is one of the clearest productivity wins available to small teams. Drafting, not sending — the human review step is what keeps quality up.
How to choose what to adopt
Pick one tool per category, not three. Give it two weeks of genuine use before judging it. Measure one specific thing — hours saved, tickets closed, drafts shipped. And keep a manual fallback for anything that matters, because tools have outages and rate limits exactly when you need them most.

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Thanks Priya — the "one tool per category" rule came from painful personal experience.
The point about picking one tool per category rather than three is the most useful thing I have read on this topic.