> ## Documentation Index
> Fetch the complete documentation index at: https://help.notis.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Channels Compared
> Discover the difference and similarities of each channels supported by Notis.
This article provides a comprehensive overview of the different channels available for interacting with Notis and their respective capabilities. Each channel offers unique features and limitations that may make it more suitable for specific use cases.
## Channel Overview
| **Feature** | | **Desktop / Web app** | **Telegram** | **iMessage** | **WhatsApp** | **Slack** | **Email** |
| --------------------------- | --------------------------------------------------------------------------------- | --------------------- | --------------- | ---------------- | --------------- | ----------------- | ------------------- |
| Signup to Notis | Channels capable of onboarding you. | ✅ | ✅ | ✅ | ✅ | ❌ | ❌ |
| Character Limit | Limits for text messages. | Virtually unlimited | 4096 characters | 10000 characters | 2600 characters | 40’000 characters | Virtually unlimited |
| Reaction Support | [Emoji reaction ](/channels/telegram#reactions)to let you know what's going on. | ✅ | ✅ | ✅ | ❌ | ✅ | ❌ |
| Message Reactions | Notis captures your emoji reactions as replies. | ❌ | ✅ | ✅ | ✅ | ✅ | ❌ |
| Inline Reply | Being able to reply to a specific message to recall its context. | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
| Inline image rendering | Image URLs can render inside the message body instead of as separate attachments. | ✅ | ❌ | ❌ | ❌ | ❌ | ✅ |
| Inline link rendering | Named links can render inline in the message body. | ✅ | ❌ | ❌ | ❌ | ✅ | ✅ |
| Table rendering | Markdown tables can render as tables in the message body. | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ |
| Max attachment size | For documents (incl. audio attachments) | 100 mb | 20 mb | 100 mb | 16 mb | 1 gb | 25 mb |
| Voice messages max duration | | No limit | No limit | No limit | 30 minutes | N/A | N/A |
| Advanced voice mode | Call Notis for real-time capabilities. | ✅ | ❌ | ❌ | ✅ | ❌ | ❌ |
| Desktop overlay | Floating chat card summoned over any app with a global hotkey. | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ |
| Context window | Max conversation tokens kept in context before older messages are pruned. | 200k tokens | 60k tokens | 60k tokens | 60k tokens | 200k tokens | 200k tokens |
When your attachment exceeds the supported size, it is ignored by the WhatsApp API and the Telegram API completely, and we don’t have any way to be notified of this. This is an unfortunate limitation at the moment.
## Supported File Formats by Purpose
| **Purpose** | **File Extensions** | **Description** |
| ------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------------------------------- |
| [Vision](/tools/images) | .jpg, .jpeg, .png, .gif, .webp | Image files for visual analysis by AI models. This allows Notis to understand the content of the image you send. |
| [File search](/tools/documents) | .c, .cpp, .cs, .css, .doc, .docx, .go, .html, .java, .js, .json, .md, .pdf, .php, .pptx, .py, .rb, .sh, .tex, .ts, .txt, .xlsx | Notis can search those documents using RAG to extract the context of your documents. |
| [Transcription](/tools/transcription) | .mp3, .wav, .ogg, .opus, .m4a, .aac, .flac, .webm (audio), .mp4, .mov, .mkv, .avi, .mpeg | Audio and video files for speech-to-text conversion. |
| Notion storage | .csv, .xlsx, .xml, .tar, .zip, .pkl | Notion supports all the previous file extensions, plus those extras. |
## Default intelligence & priority
PRO+
Custom channel defaults are included with Pro+ and Ultra
**Beta.** Per-channel defaults for intelligence and priority are rolling out as a beta feature.
Each channel can run at its own level of **intelligence** and **priority**, so the place you use Notis can have the right setup. Set these from the [Channels](https://app.notis.ai/channels) page — open a channel's **Default intelligence & priority** (the sliders icon) and pick its defaults.
> Pick this channel's default intelligence level, or leave it on Auto to let Notis choose per turn. Priority defaults to Standard. Automations always run on Economy.
Defaults can be set per channel for the Desktop and Web app, Telegram, iMessage, WhatsApp, Slack, and Email.
**Intelligence** is how capable a model Notis uses: leave a channel on **Auto** (recommended) to let Notis pick the right model per turn, or pin **Low**, **Medium**, or **High**. **Priority** is how quickly Notis is served, independent of intelligence: **Standard** (default), **Fast**, or **Economy**.
For what each intelligence level and priority tier means — including the models, Auto mode, and rates behind them — see [Usage & model rates](/account-and-settings/billing/usage-and-rates#auto-mode).
Priority applies to interactive messages only — **automations always run on Economy**.
In the [Desktop and Web app](/channels/manager#intelligence-and-priority) you can also override the intelligence and priority for a single conversation, on top of the channel default.
## Switching between messaging channels
You can freely switch between any channels you have linked to your Notis account. Each channel keeps its own conversation threads, and the [Desktop and Web app](/channels/manager) inbox unifies them all in one place.
### One account, multiple channel identities
Notis no longer treats your phone number as the single authentication. Each linked identity — a phone number on WhatsApp, the same or a different number on Messages, a Telegram handle, a Slack workspace, an email address — is stored as its own **channel account** under your Notis user. You can link several accounts on the same channel (for example, a personal and a work email, or two phone numbers on Messages) and pick which one to use when sending reminders or running automations.
### How verification works
Every channel goes through the same verification model before it can send or receive messages on your behalf:
* **Telegram, WhatsApp, and Messages** — the portal mints a short **verification code** tied to your account. Opening the personalized deeplink or QR from the [Channels](https://app.notis.ai/channels) page sends that code as the first message, which links the inbound sender (phone number, Telegram handle, or Apple ID) to your Notis account.
* **Messages is its own namespace** — a phone number or Apple ID verified on WhatsApp or as an email alias does **not** automatically work on Messages. Each Messages sender (phone or email) must be verified specifically for Messages.
* **Email aliases** — additional sender addresses are added from the portal (or by asking Notis) and verified before Notis will accept mail from them. See [Email Aliases](/channels/email#email-aliases).
* **Slack** — connected through OAuth from the portal. Reinstalling the same workspace is idempotent and reuses the existing Slack channel account.
* **Desktop and Web app** — portal-native, authenticated with your Notis login, so no separate channel-account verification is required.
### Managing channel accounts
Open the [Channels](https://app.notis.ai/channels) page to add a new channel, link an additional account to a channel you already use, or disconnect one you no longer need. When more than one account is linked on the same channel, reminder and automation editors will ask you to pick which one should deliver — or auto-pick when only one is connected.