What are the best AI assistant apps?

Gemini is Google’s personal assistant on the web and in Android and iOS apps. It drafts text, and gathers and summarizes information from Google sources. It can also browse and carry out tasks beyond a single reply, and Google tells users to supervise them.

The free plan works in the web app, and some features need no sign-in. Deep Research, Canvas and Gems come on every tier, Free included, while paid plans raise the limits and the context window, from 32,000 tokens on Free to 128,000 on Plus and 1 million on Pro.

Google AI plans are billed monthly and cancelable from Google One settings. Gemini in Gmail comes with AI Plus, while Gemini in Docs and Sheets sits on Pro.

Copilot handles chat, writing, web search with cited sources and image generation, and routes each request to an OpenAI or Anthropic model. Cowork plans and runs multi-step work, pausing for your approval at sensitive checkpoints. Agent Builder lets you set up your own agents in plain language, with no code.

The free tier covers chat, search and image generation with usage limits Microsoft does not publish. Microsoft 365 Personal costs $9.99 a month or $99.99 a year and adds Word, Excel, PowerPoint, Outlook and higher Copilot usage. Family is $12.99 a month, with AI for the subscription owner alone.

Teams buy a separate line: Microsoft 365 Copilot Business starts at $18 a user a month as an add-on to a qualifying business plan. With auditing on, organizations get a log of each Copilot interaction.

Reclaim is an AI calendar that schedules focus time, habits, tasks, breaks and recurring meetings, then moves flexible work as conflicts arise. Smart Meeting agents find new times when attendees conflict or take time off. Its chat assistant lets you review and approve calendar changes before they are applied.

The Lite plan is free for one user, with five AI agents, one week of scheduling range and one calendar sync. You can start without a credit card, and the paid plans come with a 14-day free trial.

Starter costs $12 a seat a month on monthly billing or $10 a seat a month on yearly billing, for up to 10 seats. When you cancel, a paid plan ends after the current month or year, and fees are generally nonrefundable.

Claude is Anthropic’s assistant on web, desktop and mobile, with add-ins for Excel, Word, Chrome and Slack. You state a task in plain words and Claude works out the steps. Long tasks keep running after you close the laptop, and scheduled tasks repeat on their own.

The free plan includes chat on every device, web search, memory, connectors and Artifacts, with usage limits, and needs no card. Pro is $17 a month billed annually. Max starts at $100 a month for five times Pro’s usage.

Team Standard seats run $25 a seat a month, or $20 billed annually, for teams of 2 to 150. Programmatic access is a separate product, the Claude Platform, billed per token.

CosVoice provisions a US phone number and an email address and connects both to your AI agent over MCP or an API. The line answers inbound calls with a structured intake, places outbound calls on your instruction, and sends a written summary and transcript after each call.

Plans are metered on call minutes: Starter is $29 a month with 60 minutes, Plus $69 a month with 200 minutes and Pro $149 a month with 600 minutes. Extra minutes cost $0.25 each, rounded up per call, and texts and email never use minutes. A founding-member offer holds Plus at $49 a month for the first 12 months.

CosVoice says the line identifies itself as an AI when asked and never agrees to a charge on a call. It also says no call audio is stored and calls are not used to train models.

Speechify turns text into audio: an uploaded PDF can be read aloud, summarized or turned into a podcast, and the Chrome extension reads browser content and types from speech. The Voice AI Assistant understands over 60 languages and accents.

The free reader plan has listening up to 1.5x and ten robotic-sounding voices. Premium adds natural voices, Scan and Listen, summaries, cloud-storage integrations and the Voice AI Assistant, at $29 a month or $139 a year. Premium voice usage is capped at 1,000,000 words a month during 2026.

Speechify Studio, for voiceovers, is a separate subscription, and the terms say services other than Voice Over Studio are not intended for commercial use. The text-to-speech API is also a separate line with its own plans.

Lindy works from your existing Gmail or Outlook inbox, books meetings through Google Calendar, Google Meet and Zoom, and turns conversations into reminders in Slack or Notion. Routines run on a schedule or trigger, and actions that write or send stop for a human approver first. Setup takes plain-language instructions.

Pricing starts at $49.99 a seat a month, billed monthly per active user with included credits pooled across the team. Subscriptions can be canceled from the account and end after the paid term.

Lindy holds a SOC 2 Type II audit by Johanson Group. Healthcare teams need Enterprise for a signed business associate agreement under US health-privacy rules.

ChatGPT is OpenAI’s hosted assistant, running GPT-6.1 Sol and GPT-6 Astra for chat, uploads and reasoning. Connected apps bring outside information and actions into a conversation, and projects, tasks and custom GPTs keep repeat work in one place.

The Free plan has no set time limit and needs no credit card. Ads may appear on Free and Go accounts, while Plus, Pro, Business, Enterprise and Edu are ad free. Which models a plan reaches is set by its tier, with Free limited where Plus and Pro are expanded.

Personal accounts share conversations for model improvement by default, and you can turn it off in Data Controls. Temporary Chat stays out of history, with copies kept up to 30 days for safety. Business workspaces add administrator retention controls, single sign-on and audit logs.