Alter: macOS-native AI meeting assistant that records and transcribes calls locally with built-in Whisper and Parakeet models, no bots required. Celeste AI: Brazilian Portuguese-focused AI voice and transcription platform offering on-demand transcription plus a meeting assistant and AI notes, with credit-based and subscription plans. Here's where each one pulls ahead on pricing, features, and the meetings it suits best.
How Hosiqo compares and tests toolsFinal recommendation
Shortlist Alter when freelancers and consultants privately capturing client calls without a visible bot matters most, and Celeste AI when companies needing pay-as-you-go transcription without fixed subscriptions matters most. Try them side by side on real calls before deciding — needs vary by team.
macOS-native AI meeting assistant that records and transcribes calls locally with built-in Whisper and Parakeet models, no bots required.
Brazilian Portuguese-focused AI voice and transcription platform offering on-demand transcription plus a meeting assistant and AI notes, with credit-based and subscription plans.
Alter is a native macOS application that records, transcribes, and analyzes meetings directly on the user's Mac without sending a bot into the call. Instead of joining a meeting as a visible participant, Alter captures audio from the system output and microphone, so it works across Zoom, Microsoft Teams, Google Meet, WhatsApp, FaceTime, Skype, Discord, and in-person conversations. Transcription runs through on-device models, with a choice of an optimized Parakeet model for major languages or Whisper for broader language coverage, and speaker identification is performed locally. Because processing happens on the device, recordings and transcripts stay on the Mac and the app can operate without an internet connection. Beyond raw transcripts, Alter generates summaries and action items, lets users chat with their meetings, and connects to tools such as Notion, Slack, Linear, Asana, and Jira. It targets solopreneurs, freelancers, consultants, and other professionals who want private, bot-free meeting capture on macOS. The product is actively developed and operating in 2025 and 2026. Pricing varies by plan. Check the official website for current pricing.
Best suited for
Celeste AI is a Brazilian voice AI and transcription platform that specializes in Portuguese, particularly Brazilian Portuguese, while also processing audio in additional languages such as English, Spanish, German, Italian, and French. Originally known for automated audio-to-text transcription that the company positions as far more efficient than manual transcription, Celeste AI has expanded into a broader suite that includes a Meeting Assistant (Assistente de Reunião) and AI Notes (Notas de IA), alongside transcription and quality-monitoring offerings. The platform uses machine learning speech models tuned for Portuguese and is offered both as an on-demand service and via an API, so users and businesses can transcribe content as needed. Its on-demand model lets customers pay only for the hours they actually use by purchasing credits, with flexible subscription plans available for those who have recurring transcription needs. As a Brazilian company connected to local institutions such as FGV Ventures and the São José dos Campos technology park, Celeste AI is oriented toward the Brazilian market and Portuguese-language workflows, and it reports a growing user base. The service is currently operating, with a functioning login, demo requests, and support, and is suited to professionals and companies that need accurate Portuguese transcription and meeting documentation. Pricing varies by plan. Check the official website for current pricing.
Best suited for
Alter is a free tier with paid upgrades (freemium); Celeste AI is a free tier with paid upgrades (freemium). Always confirm current pricing on each vendor's site before buying.
| Feature | Alter | Celeste AI |
|---|---|---|
| Core capability | On-device transcription using built-in Whisper and Parakeet models | AI transcription specialized for Brazilian Portuguese |
| Standout feature | Bot-free capture of system audio and microphone across any meeting or call app | Meeting Assistant for capturing and documenting meetings |
| Team usage | Automatic speaker identification performed locally | AI Notes for organizing transcribed content |
| Integrations | AI summaries, action items, and chat-with-your-meeting Q&A | Support for multiple languages including English, Spanish, German, Italian, and French |
| Languages & capture | Integrations with Notion, Slack, Linear, Asana, Jira and other tools | On-demand credit-based usage plus flexible subscription plans |
| Best-fit workflow | Offline operation with recordings and transcripts stored locally | API access for integrating transcription into other workflows |
Alter
Choose Alter if you need freelancers and consultants privately capturing client calls without a visible bot — strengths include local processing keeps recordings and transcripts on the user's own mac.
Celeste AI
Choose Celeste AI if you need brazilian teams transcribing meetings and calls in portuguese — strengths include strong focus on brazilian portuguese transcription accuracy.
Alter
Celeste AI
It depends on your workflow. Alter is strong for freelancers and consultants privately capturing client calls without a visible bot, while Celeste AI is strong for brazilian teams transcribing meetings and calls in portuguese. Both transcribe and summarize meetings.
Alter is a free tier with paid upgrades and Celeste AI is a free tier with paid upgrades. Check each vendor's pricing page for the latest plans and free-tier limits.
Sure. Running both makes sense when their strengths don't overlap and the budget allows.
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