ChatGPT vs Tanka AI

The same 33-row checklist and the same rules. Every cell shows vetted official evidence or “Not checked.”

Visit ChatGPT Visit Tanka AI ChatGPT alternatives Tanka AI alternatives

So which one?

Notis aside, ChatGPT has the highest checked-evidence score: 80% across 32 vetted rows; 1 row is not checked yet. Tanka AI: 27% across 31 vetted rows; 2 rows are not checked yet.

They are not really after the same job, though: ChatGPT for keeping the product and your data under your own control and Tanka AI for remembering context between conversations.

Cheapest way in is a tie: Notis, ChatGPT and Tanka AI all start at $0, and only ChatGPT has a free plan that does the product's main job.

Only Notis publishes anything on iMessage, Telegram and Email, and only ChatGPT on Bring your own API key and Joins and records your meetings.

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The whole grid, row by row

Capability comparison between Notis and the selected assistants
Capability	View pricing	ChatGPTVisit site	Tanka AIVisit site
Where you can use it
WhatsApp		Partial	—
iMessage		—	—Not named on any first-party page
Telegram		—	—Ingested as a source, not a channel
Slack			—
Email		—	—
SMS or a phone number	PartialInbound calls only, no SMS	Partial	—
Voice messages	Voice notes + live calls		Not checked
Web or desktop app	Web and desktop app		Web app only, no downloadable client
Its own iPhone or Android app	—		iOS + Android, both updated today
Bring your own AI
Runs on your own Claude plan		Not checked	—Not offered
Runs on your own ChatGPT plan			—Not offered
Bring your own API key	—		—Not offered
Works inside your own coding agent			—No MCP server or agent plugin published
You choose which model runs your work			—No model picker documented
What it can do
Ready-made app integrations	1,000+ apps	Partial	Partial80+ claimed; no browsable directory
Creates and edits documents			Documents, Meeting Notes, Databases
Save your own reusable instructions			Not checked
Browses the web for you			—Not documented
Posts to social media for you			—Not documented
Joins and records your meetings	—		—
Memory
Remembers you between conversations			EverMemOS, unlimited, cross-quarter
Reads your existing files and apps	Notion, Gmail, Drive, Granola, web		8 named sources with a documented flow
Runs without you
Runs on a schedule or a trigger			Partial
Reminds and nudges you			—
Computers it can use
Gives it a cloud computer of its own	1h/mo (Pro) to uncapped (Ultra)	Partial	—Not documented
Controls your own computer	Shell and apps, via the desktop app		—Clients are apps, not a local agent
Connects to MCP servers on your computer			—Not documented
Trust & control
Open source	—	Partial	—No repository or licence published
Run it on your own server	—	Partial	—Hosted service only
Says it will not train on your data	Covers Notis and its LLM providers	Partial	PartialScoped to Google Workspace APIs only
Published security certification	PartialSub-processors certified; Notis is not		Partial
Plans & support
Free plan does the product's main job	Partial		Partial
Shared team workspace
Price	FREEPRO$13/moyr (rate on a yearly commitment)+2 more	Codex CLI (free software; API/model usage billed separately)Free+7 more	FreePlus$22.92/moyr (rate on a yearly commitment)+1 more

IncludedPartial— Not documentedNot checked

The catch with each one

Numbered by support score across vetted capability rows, with incomplete evidence shown on every card. Unknown rows never count as a no, and this is not a score against your answers.

1. Notis

Personal AI assistant

Notis is a personal AI assistant you message from WhatsApp, iMessage, Telegram, Slack or email, and reach from your own coding agent through its MCP server.

Best for: reaching it from the apps you already message in

Documented strengths

Where you can use it: WhatsApp, iMessage, Telegram, Slack, Email, Voice messages and Web or desktop app
What it can do: Ready-made app integrations, Creates and edits documents, Save your own reusable instructions, Browses the web for you and Posts to social media for you
Bring your own AI: Runs on your own Claude plan, Runs on your own ChatGPT plan, Works inside your own coding agent and You choose which model runs your work

The catch

Official evidence records a gap in published guarantees about your data: no published support for Open source and Run it on your own server.

Pricing

FREEPRO$13/moyrPRO+$39/moyrULTRA$99/moyr

Free–$149/mo · help.notis.ai

Who should pick it

Pick Notis if reaching it from the apps you already message in is what decides it for you. Walk away if you need open source, self-hosting or a named certification.

See what those rows cost80% across 33 vetted rows (all 33)

2. ChatGPT

General-purpose AI assistant

Combines conversational help, multi-step Work, and Codex across web, mobile, and desktop.

Best for: keeping the product and your data under your own control

Documented strengths

What it can do: Creates and edits documents, Save your own reusable instructions, Browses the web for you, Posts to social media for you and Joins and records your meetings
Bring your own AI: Runs on your own ChatGPT plan, Bring your own API key, Works inside your own coding agent and You choose which model runs your work
Where you can use it: Slack, Voice messages, Web or desktop app and Its own iPhone or Android app

The catch

The checked gap is messaging channels. Nothing published on iMessage, Telegram and Email.

Pricing

Codex CLI (free software; API/model usage billed separately)FreeGo$8/moBusiness Standard$20/user/moyrPlus$20/moBusiness Premium$100/user/moyrPro 5x$100/moPro 20x$200/moEnterpriseCustom pricing

$0-$200/month individual; Business $25-$125/user/month ($20-$100 annual); Enterprise custom · free tier available · chatgpt.com

Who should pick it

ChatGPT is the one to take when keeping the product and your data under your own control is the deciding factor. Walk away if you need it in the other apps you message from.

Our take on how it differs from Notis: A broad destination assistant with first-party models and agentic Chat, Work, and Codex surfaces, rather than a channel-first cross-provider execution layer.

Visit ChatGPT80% across 32 vetted rows; 1 row is not checked yet

3. Tanka AI

AI agent platform for startups with shared long-term memory (EverMemOS)

An agent platform for startup teams that turns connected chat, mail and files into one shared long-term memory (EverMemOS) its agents read, write and act from.

Best for: remembering context between conversations

Documented strengths

Memory: Remembers you between conversations and Reads your existing files and apps
Where you can use it: Web or desktop app and Its own iPhone or Android app
Plans & support: Shared team workspace

The catch

No support for your own AI plan, at all. We found nothing published on Runs on your own Claude plan, Runs on your own ChatGPT plan, Bring your own API key, Works inside your own coding agent and You choose which model runs your work.

Pricing

FreePlus$22.92/moyrPro$199/mo

Free–$199/mo (Plus $29/mo or $274.99/yr; Pro $199/mo) · apps.apple.com

Who should pick it

Worth it for remembering context between conversations — that is what Tanka AI is built around. Walk away if you need to reuse an AI subscription or key you already pay for.

Our take on how it differs from Notis: Tanka makes team communication itself the memory system and routes tasks between connected apps on its own; Notis is a channel-first assistant that acts across WhatsApp, iMessage, Telegram, Slack, email and voice with an execution layer across model providers.

Visit Tanka AI27% across 31 vetted rows; 2 rows are not checked yet

What this table does not tell you

One more thing, because a table like this can be read for more than it is worth. It counts what each product documents. It says nothing about how reliable any of them is, how fast it replies, how good its writing is, or what it does when an integration breaks on a Friday night. A lower support score can still be the better daily driver. The only way to know is to put a real week of work through both.

A dash means the capability was not documented on the official pages we checked. Not checked means the evidence is still incomplete.

Questions people ask

Which of ChatGPT or Tanka AI scores highest in the evidence checked so far?

ChatGPT, with 80% across 32 vetted rows; 1 row is not checked yet. Tanka AI: 27% across 31 vetted rows; 2 rows are not checked yet. Unknown rows stay out of the score, so treat this as an evidence status, not a complete market verdict.

How much do they cost?

ChatGPT: $0-$200/month individual; Business $25-$125/user/month ($20-$100 annual); Enterprise custom; Tanka AI: Free–$199/mo (Plus $29/mo or $274.99/yr; Pro $199/mo). Notis, ChatGPT and Tanka AI all start at $0, and only ChatGPT has a free plan that does the product's main job.

Which of them can I try for free?

ChatGPT and Tanka AI have a free tier.

Which of them work in Slack?

ChatGPT does. Tanka AI does not.

How was this comparison put together?

We read whatever each product publishes — 76 first-party sources across 3 products — and scored all of them on the same 33 rows. Last checked 21 August 2026. A dash means the capability was not documented on the official pages we checked. Not checked means the evidence is still incomplete.

Where does Notis fit in?

At number 1, scored by the same code on the same 33 rows as everything else. Against ChatGPT specifically: A broad destination assistant with first-party models and agentic Chat, Work, and Codex surfaces, rather than a channel-first cross-provider execution layer.

How we checked all this

We read every product on this page against whatever it publishes — docs and pricing pages where there are any, the homepage where that is all there is — against the same 33 buyer-focused rows. A support score uses only rows with an explicit vetted state; every unchecked row remains visible and never becomes a no. Notis chose the questions and is scored by the same rule. Count the links below before you weigh a result; some vendors give us three pages and some give us one. Last checked 21 August 2026. No vendor briefings, no affiliate links, no press releases.

Sources

Spotted something out of date? These things move weekly and we would rather be corrected. Tell us at flo@mindtheflo.com and the row gets rechecked.

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