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Harry Guinness

Harry Guinness is a writer and photographer from Dublin, Ireland. His writing has appeared in the New York Times, Lifehacker, the Irish Examiner, and How-To Geek. His photos have been published on hundreds of sites—mostly without his permission.

Harry Guinness

Harry's articles

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More from Harry

App tips

OpenAI models: Every model (including GPT-5.4) and what it's best for

This is your complete guide to all of OpenAI's major models. We'll look at what each one is good for, how much they cost, and how to make the most of them in your work. 

By Harry Guinness

12 min read

App comparisons

LastPass vs. 1Password: Which password manager should you use? [2026]

Passwords are terrible. They're either too easy to guess or impossible to remember, and using the same one everywhere is practically inviting hackers to take down all of your accounts at once. Which is why password managers are a good idea.

By Harry Guinness

13 min read

App tips

What is agentic AI? And how you can start using it

Agentic AIs are the latest attempt to create a framework for what these tools would look like and how they could safely operate.

By Harry Guinness

12 min read

Best apps

The 9 best social media management tools in 2026

Social media is a powerful tool for small businesses. You can use it to find new customers, drive traffic to your website, and keep in touch with existing clients.

By Harry Guinness

18 min read


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A Zap with the trigger 'When I get a new lead from Facebook,' and the action 'Notify my team in Slack'