Best AI Assistant for Android or Mac? 7 Free Checks

Search the best AI assistant for Android and you’ll get the same answer ten different ways: a list of app names, a feature grid, maybe a star rating. What you almost never get is a way to decide — a checklist you can apply to any assistant, so you know why one deserves the spot on your home screen and another doesn’t.

So here’s the checklist I run when I evaluate assistants, built around one question: does it actually reduce the steps between seeing something and doing something about it? I work on Arc, an AI screen assistant for Android and Mac, and I’ll score Arc against every point honestly — including where it’s weak. You can run the same seven checks against Gemini, ChatGPT, Bixby, Copilot, or whatever ships next, and get a consistent answer instead of a vibe.

Why “best” is mostly a category question

The first thing to understand when you compare AI assistant apps in 2026: you’re not choosing between brands, you’re choosing between architectures. Before the checklist, meet the contenders you’ll be scoring.

Gemini (built into Android) replaced Google Assistant, so it’s the default you already own. It answers general questions well and runs device commands — timers, smart home, app opening. What it generally can’t do is see or act on the content in your other apps; screen context isn’t part of its core Android surface, and its best knowledge features sit behind Google’s paid tiers.

ChatGPT, Claude, Perplexity, Copilot (standalone apps) are the strongest conversationalists on the list — genuinely excellent at writing and analysis. Their architecture is app-bound though: whatever you want help with has to be copied into their box first, and nothing they produce lands back in your phone’s real surfaces without another manual paste.

Bixby (Samsung) is device automation done well inside Samsung’s walls — settings, routines, app launching — but it’s not a general AI assistant and doesn’t read your screen contextually.

Arc (free, any Android 10+ phone, plus Mac) is the screen-aware contender that this checklist is mostly about: it reads what’s already on your screen from a floating overlay and finishes jobs in place — summarizing, extracting, drafting, and acting through Android’s own calendar, contacts, and clipboard.

Why does the category matter more than the brand? Because in practice, everything else in the checklist — platform fit, overlay access, actions, privacy, price — only matters after you’ve picked an architecture. A chat app that can’t see your screen may tick every other box and still fail check #1.

Check 1: Does it read your screen, in any app?

Arc: pass. Gemini: fail. Bixby: fail. ChatGPT/Claude/Copilot: fail.

This is the entry bar. If an assistant can’t see the content you’re looking at, everything else is workaround-shaped: you select text, copy it, switch apps, paste, ask, read the answer, switch back.

Screen awareness changes the math. You’re reading a long article in Chrome at midnight — swipe from the edge and Arc reads the visible page through the Accessibility layer, detects it’s an Article, and hands you a summary in 2–3 seconds with the source app and URL attached. Same tap works over a Gmail thread, a YouTube description, a Reddit post, a PDF in a viewer. Our GA4 export for this post shows about 1,400 AI summaries generated during its 30-day window (through early October 2026) — same tap, every time.

How to test any assistant yourself: open a random screen with text on it (article, email, chat thread) and count the steps to get a summary without leaving the app. Chat-first apps fail at step zero — they can’t start. Arc: one tap, no paste.

Check 2: Can you reach it from anywhere — without leaving your app?

Arc: pass. Gemini: fail (Google’s own on-screen workarounds cover a narrow allowlist). Bixby: fail. Chat apps: fail.

An assistant that requires an app switch fails quietly, because “quick question” becomes a round trip: leave → open → paste → ask → switch back. Multiply by twenty touches a day and the assistant loses.

Arc’s answer is the floating sidebar: a small semi-transparent bar on the screen edge that you summon from whatever app you’re in — system-wide by design, once you’ve granted the Accessibility and overlay permissions at setup. It’s draggable to wherever your thumb is, with an auto-hide option (3–15s) that fades it when idle. Swipe inward and the panel expands with spring physics — actions in a 2-column grid, glassmorphism panel, accent border.

The reach numbers are the ones I check first in our analytics: 39,873 sidebar opens in 30 days, from 2,016 users — roughly 20 taps per active user per month. Users aren’t installing Arc and wandering off; the sidebar becomes muscle memory. And when a floating overlay doesn’t fit how you use your phone, System Sidebar Integration mode plugs Arc into your device’s own system sidebar — Samsung’s Edge Panel, the OnePlus Shelf, or OPPO’s Smart Sidebar — so access feels native instead of bolted on.

The same model exists on desktop: on Mac, ⌃ Space summons a centered, Spotlight-style Arc menu over the app you’re working in — and the panel doesn’t steal focus (non-activating panel), so your cursor stays put while Arc reads the frontmost window. 7,978 MAU and 3,366 first-opens in the last 30 days — the assistant is getting used, not just installed.

Check 3: Does it act, or just answer?

Arc: pass (8 item types, one-tap system actions). Gemini: fail. Chat apps: fail. Bixby: partial (routines and device commands, not screen actions).

Chat-first assistants produce text you then have to do something with. A screen assistant should finish the job — turning screen content into a real action through the system’s surfaces.

Arc’s Smart Extract shows what “act” means: it scans the screen you have open and pulls out 8 item types — events, reminders, contacts, meeting links (Zoom/Meet/Teams), locations, OTP codes, phone numbers, and email addresses — each as a card with a one-tap system intent. “Add to Calendar” comes pre-filled with the date and time from the email. “Save Contact” writes through Android’s contacts UI. “Copy code” copies the OTP — and the clipboard auto-clears after 2 minutes for security. Items stay ephemeral: nothing is permanently stored unless you act on it.

That’s the line between a chatbot and an assistant: chat ends at the answer; the assistant ends at the action.

Check 4: Writing help in the app you’re already in

Arc: pass (4 modes, in place). Chat apps: help with text you paste in, not your live conversation. Gemini/Bixby: fail.

Replying is the highest-frequency phone task, and it happens in other apps’ text fields. So the test: can you draft the reply without switching?

AI Writer opens as a bottom sheet in the app you’re typing in (once the setup permissions are granted), with four modes:

• Reply — reads the surrounding conversation (with sender identification), drafts contextual responses, auto-fill from the focused field.
• Rewrite — polish your draft in tones: Rephrase, Professional, Polite, Shorten, Elaborate, Custom (500-char instruction).
• Fix Grammar — one-tap proofread.
• Create Post — social posts/reviews from screen context.

4,478 AI Writer uses by 302 users in 30 days — each averaging ~15 rewrites/replies. That’s a habit, not curiosity. And because the writer can integrate with My Info Vault, replies can sound like you: keep details in a local-sandbox vault, and AI Writer can use them when you explicitly include that entry for a draft; the vault itself (stored locally, optional encrypted Drive backup) is never uploaded to servers independently.

Check 5: Does it remember you — privately?

Arc: pass (local vault + on-demand screen context). Chat apps: server-side memory, governed by their settings. Gemini/Bixby: basic.

A “personal” assistant that needs you to re-explain context every time isn’t personal; it’s a search box with extra steps. The check has two halves: does it remember, and does it remember privately?

Arc splits the answer in two. Context on demand: Chat Screen opens with the screen pre-loaded as “Original Context” — ask about the screen you’re looking at, multi-turn, history keeps everything searchable. Last 30 days: 3,820 messages sent by 967 users across 4,265 chat sessions (~4 messages/session). Persistent personal context: My Info Vault — a local-sandbox vault (addresses, IDs, account numbers, preferences) that never uploads independently, with optional encrypted Drive backup, injected only when you turn it on for a specific AI Writer run; AI Read plays any note back as audio (1,965 TTS playbacks by 848 users in the last 30 days).

On privacy, the test is what happens to sensitive stuff. Arc’s posture, as designed and documented: on-device storage first — the vault lives in the app’s local sandbox, transcripts and results are stored on your device, audio is processed for analysis rather than kept as Arc-side storage, and screenshots are only captured with your consent. Assistants differ on this — check where your content sleeps before you commit.

Check 6: Where does it run? Android today, macOS today, Windows and iOS coming

Arc: Android 10+, any brand + macOS. Gemini/Bixby: Android (Bixby Samsung-only). Chat apps: everywhere — but app-bound everywhere. Windows/iOS Arc: coming soon.

Platform reach decides whether an assistant can follow your day. Arc today:

• Android — floating sidebar + Edge Panel/Shelf/OPPO sidebar integrations, all the screen actions, Call Insights (upload MP3/M4A/WAV/AAC/OGG/FLAC up to 100 MB; Auto Analysis folder monitoring runs every 6/12/24h; report = speaker-labeled transcript, summary, checkable action items, key insights; transcripts stay on-device).
• macOS — the same assistant through the ⌃ Space Arc menu: it reads any window’s screen and summarizes, extracts, replies, and reads aloud without stealing focus from the app you’re in.
• Windows and iOS — coming soon — the assistant isn’t there for you yet; check back at www.appsrethink.com or run it on Android/Mac today.

That honesty is what makes a buyer’s guide honest — assistants claiming platform parity usually can’t back it up. The “best” assistant is the one available where your work happens: if your day is phone + Mac, Arc covers both today; if it’s Windows-heavy, check back later.

Check 7: What it costs — and whether the core is real in the free tier

Arc: free core is the real product. Gemini: best features paywalled. Chat apps: freemium with tight caps. Bixby: free, device-scoped.

Cost is where “best” gets practical. There’s a pattern across the assistants on Android: several restrict their genuinely useful functionality behind subscription walls — Gmail’s Gemini features for example are paywalled; Gemini’s best screen-reading features are locked behind the Google AI paid tiers. The free cores are demos for the paid product.

Arc’s core is genuinely usable free: AI Summary, Smart Extract, AI Writer, Chat, Flashcards, Call Insights upload+analyze, My Info Vault, AI Read, Custom Actions with a 40,000-character prompt limit, and the community library for one-tap actions others have published. Free-tier limits exist (fair-use caps on AI calls; the sidebar and vault are not metered) — the honest framing: the core loop is free; the paid tier adds capacity. Revenue check: 114 purchase/subscription-renew events in 30 days from a ~8,000-user base — real people are paying, but not to unlock the front door.

The 7-point comparison — Arc vs. the field

Run all seven checks together and the landscape looks like this:

#	Check	Arc	Gemini	ChatGPT app	Bixby
1	Reads any screen, any app	✅	❌	❌	❌
2	Reachable in-app (overlay/hotkey)	✅ sidebar	❌	❌	❌
3	Acts, not just answers (Smart Extract)	✅	❌	❌	Partial
4	Writing help in place (AI Writer, 4 modes)	✅	❌	❌	❌
5	Remembers you, privately (vault local)	✅	❌	❌	❌
6	Platforms (Android + macOS now; Windows + iOS coming)	✅	Android	Multi-app	Samsung-only
7	Free core isn’t a paywall demo	✅	Paywalled	Limited	✅

One assistant passes all seven. That’s not marketing — it’s architecture: the overlay + screen reading + local vault + system intents are the pieces that make an assistant work in place, and no chat-first assistant has them, because their product is the chat.

Head-to-head? Our AI assistant alternatives page lines Arc up against the apps above feature by feature.

Getting started: 30-second setup

1. Download Arc free on Google Play — runs on Android 10+, no flagship required.
2. Grant overlay + Accessibility permission (30 seconds, standard for screen assistants).
3. The sidebar appears on the screen edge. Any app. Anywhere.
4. On Mac, press ⌃ Space in any app — same assistant, desktop mode. (Windows and iOS coming soon.)

Try the loop on your own content: open something long → swipe the sidebar → AI Summary → tap Listen if you’d rather hear it. That first minute tells you more than any review — including this one.

More depth per feature: the personal AI assistant hub explains the assistant-in-every-app idea end to end; the AI assistant vs chatbot explainer covers the category question for Android specifically; the AI keyboard vs overlay comparison explains why keyboards can’t do this job; and if you want the meetings angle, the no-bot AI note taker guide shows the same overlay loop applied to call recordings.

FAQ

What is the best AI assistant for Android?

The best AI assistant for Android depends on what you need, but for anything involving your screen — summarizing articles, extracting dates and OTPs, drafting replies in WhatsApp or Gmail — a screen-aware assistant like Arc fits best, because chat-first apps can’t see your screen and need copy-paste round trips.

Is there a truly free AI assistant for Android?

Yes. Arc’s core is free: AI Summary, Smart Extract, AI Writer, Chat, Flashcards, Call Insights upload+analyze, My Info Vault, and AI Read, with fair-use caps on AI calls. Several built-in assistants keep their best features subscription-only — Arc’s usable core is free, the paid tier mainly adds capacity. macOS app is free as well.

Which assistant works on every app on my phone?

Arc works on every app because it reads the screen through the Android Accessibility layer from a floating overlay — Chrome, WhatsApp, Gmail, Reddit, PDF viewers, anything. Gemini and Bixby mostly control the device; ChatGPT and Copilot see only what you paste. Integrations with Samsung Edge Panel, OnePlus Shelf, and OPPO Smart Sidebar make Arc feel native on those devices.

Is Arc available on Mac, Windows, or iPhone?

Arc is live on macOS today (⌃ Space over any app — the menu reads the frontmost window without stealing focus) and on Android today. Windows and iOS are coming soon — check www.appsrethink.com for status.

Is sending screen content to an AI assistant safe?

Arc is built privacy-first: My Info Vault and Call Insights transcripts are stored locally on your device, the vault is never uploaded to servers independently (optional encrypted Drive backup is opt-in), Smart Extract items stay ephemeral unless you act, and screenshots are captured only with per-consent. Review each assistant’s data policy — and prefer ones that read your screen locally via Accessibility rather than recording your screen continuously. It’s your data either way.