In 2025, the AI assistant market has exploded. ChatGPT, Gemini, Claude, Copilot, Perplexity, Hey Friday, and a dozen others all want to be your go-to AI. Each has real strengths and real weaknesses. Choosing the wrong one means either overpaying for features you do not use, or missing capabilities you actually need. Here is how to think through the decision.
Start With Your Primary Use Case
The single most important question is: what will you use an AI assistant for most of the time? The answer dramatically narrows your options.
If you want a voice assistant — one you can talk to and that talks back — most AI assistants are surprisingly bad at this. They were built for text. Hey Friday is built specifically for voice interaction: it uses your phone's on-device speech recognition, responds naturally, and supports a wake word on Android.
If you need deep research — summarizing papers, analyzing documents, web search — Perplexity and Claude tend to excel. ChatGPT with browsing is also capable here.
If you need coding help — GitHub Copilot and Claude are generally the strongest. ChatGPT is competent but shows its age in fast-moving areas.
If you want an all-rounder — something for daily questions, writing, and general assistance — ChatGPT, Gemini, and Hey Friday all work well. The differentiators are price, privacy, and how well they work on mobile.
Privacy: The Question Most Guides Skip
Most AI assistant comparison guides focus on benchmark scores and feature lists. They skip the question that matters most for daily use: what happens to your data?
Every AI assistant that processes your queries in the cloud collects some data. The important questions are: Is your data used to train future models? How long is it retained? Can you delete it? Is your voice (not just text) sent to the cloud?
Read the privacy policy before committing to any AI assistant you plan to use for personal conversations, health questions, or sensitive work matters. If the privacy policy is vague about training data, assume your conversations are being used.
Price: What You Actually Get for Free
Every major AI assistant has a free tier, but the limits vary enormously. ChatGPT's free tier uses GPT-4o Mini with limited access to the full model. Gemini's free tier is genuinely capable. Hey Friday's free tier gives 100 chat credits per day — enough for substantial daily use — plus unlimited basic image generation.
The question is not just how much you get, but what happens when you hit the limit. Some AI assistants stop responding entirely. Others slow down. Others switch you to a weaker model without telling you. Know the policy before you rely on a free tier for important work.
Mobile Experience: The Overlooked Factor
Most AI is used on mobile, but most AI assistants are designed for desktop. The result is apps with tiny text, awkward interfaces, and voice input that feels like an afterthought. Before committing to an AI assistant, spend a week using it exclusively on your phone. The friction differences between well-designed and poorly-designed mobile AI are enormous.
Progressive Web Apps (PWAs) deserve special consideration. They install from the browser, work like native apps, update automatically, and do not require App Store approval. Hey Friday is a PWA: add it to your home screen from Safari or Chrome and it works exactly like a native app, including fullscreen mode and offline caching.
Model Quality vs. Interface Quality
A common mistake is choosing an AI assistant based on the underlying model rather than the complete experience. The model matters, but so does latency, how well the interface handles long conversations, whether the AI remembers context, and how natural the voice interaction feels.
A slightly less capable model delivered with lower latency and a better interface often produces better real-world results than a more powerful model wrapped in a frustrating UI.
The Checklist
Before choosing an AI assistant, run through these questions:
- Does it support voice input and output, or is it text-only?
- What happens to my conversations — are they used for training?
- What does the free tier actually include, and what are the hard limits?
- How does it perform on mobile specifically?
- Is it available as a PWA or does it require a native app download?
- Does it support the AI models I want to use?
- What is the latency like for voice responses?
There is no universally correct answer. The right AI assistant is the one that fits how you actually work, not the one that scores highest on synthetic benchmarks.