Fello AI vs Mammouth

Fello AI

• Apple users who want one native app for many AI models
• People who want model access without managing API keys
• Turning notes and PDFs into Word, Excel or PowerPoint files

Mammouth

• People who want GPT, Claude, Gemini and other models on one bill
• Comparing answers from several models on the same prompt
• European teams that want GDPR-aligned processing and central billing

Fello AI

• It is available on Mac, iPhone and iPad only; the vendor says there is no Windows or Android version.
• Free users get 5 questions per hour with premium models before the app switches to its Free AI model.
• The vendor's FAQ lists lower prices ($3.99 weekly, $9.99 monthly, $79.99 yearly) than the US App Store listing. The price charged is the one shown in the app.
• Billing runs through Apple, and existing ChatGPT, Claude or Gemini subscriptions cannot be connected or used inside the app.

Mammouth

• There is no free plan, and the pricing page lists no free trial.
• Usage is limited per session and quotas renew after 3 hours. At a model's limit Mammouth switches to a lighter model.
• There is no App Store app: on iPhone, Mac and Windows it installs from the browser as a web app. Android has a Play Store listing.
• Prices are shown in euros or US dollars depending on the visitor's country, and dollar prices exclude VAT. Paying by bank transfer needs an annual commitment.

Fello AI

20+ models in one app

Switch between GPT, Claude, Gemini, Grok, DeepSeek, Kimi, Perplexity and other models from one menu, with no separate subscriptions. Reasoning mode is available across the major models.

Adaptive Search and Deep Research

The app decides when a question needs live web data and answers with sources. Online Search and Deep Research can also be picked by hand from the skills menu.

Skills that produce files

Describe what you need and the app builds a PowerPoint deck, Word document, Excel sheet or PDF in the conversation. A Podcast skill turns a document or topic into a two-host audio episode.

Files and images

Upload up to 16 files per conversation at up to 16 MB each, including PDFs of up to 500 pages and Office documents. Image models generate pictures and edit existing ones from a prompt.

Floating chat bar and dictation

On the Mac, Option-Space opens a chat bar over any app. Voice dictation records up to five minutes at a time and transcribes in more than 100 languages.

Projects, pins and bookmarks

Projects hold shared background, instructions and files for related chats. Conversations can be pinned, replies bookmarked, and everything searched in full text.

Mammouth

Many models in one subscription

One plan covers text models from OpenAI, Anthropic, Google, Mistral, xAI, DeepSeek and others, with Perplexity for web and deep research. The default model in each category can be reordered.

One-click reprompting

Send a prompt, along with the conversation history, to another model to compare or complement the answer without retyping it or opening a new chat.

Image, video and music generation

Image models include Nano Banana, GPT Image, FLUX, Recraft and Stable Diffusion. Video runs on Veo, Kling and Grok Imagine, and music on Lyria.

Custom mammouths

Custom assistants keep instructions and files for reuse across conversations. In a team they can be shared with read-only or edit access while conversations stay private.

Voice chat, dictation and read-aloud

Hold a real-time voice conversation and get a transcript afterwards, dictate a message as text, or have any answer read out with text-to-speech.

Connectors, API and Mammouth Code

MCP connectors link Microsoft 365, GitHub, Notion, Atlassian or a custom server to the chat. Every plan includes monthly API credits and the Mammouth Code tool for developers.

Fello AI

• Free$0

  Up to 5 questions per hour with premium models, then a Free AI model until the hour resets. Advanced features need a paid plan.

• AI Chatbot Weekly Plan$4.99

  per week

  Unlimited questions with every premium model and Skills on Mac, iPhone and iPad under one Apple ID.

• AI Chatbot Monthly Plan$11.99

  per month

  The same unlimited access to all premium models and Skills, billed monthly through Apple.

• AI Chatbot Quarterly Plan$24.99

  per quarter

  The same unlimited access to all premium models and Skills, billed every three months through Apple.

• AI Chatbot Yearly Plan$89.99

  per year

  The same unlimited access to all premium models and Skills, billed once a year through Apple.

Mammouth

• Starter$10

  per month, billed yearly ($120); $12 billed monthly, excl. VAT

  For regular use: all text, image and video models, web and deep research, projects, voice chat and $2 of API credits. A lighter model stays available at the limit.

• Standard$20

  per month, billed yearly ($240); $24 billed monthly, excl. VAT

  For intensive use: the same features with 3 times the usage of Starter and $4 of API credits.

• Expert$60

  per month, billed yearly ($720); $72 billed monthly, excl. VAT

  For maximum use: the same features with 10 times the usage of Starter and $10 of API credits.

• Team$10

  per user / month, billed yearly; $12 billed monthly

  The same per-user prices as the individual plans, which can be mixed, with an admin console for licences, centralized billing and shared projects.

• EnterpriseCustom

  For more than 100 licences: onboarding, SSO and flexible payment options such as wire transfer, by quote.

Fello AI

• Annual discount

  About 37% less with the yearly plan

  On the US App Store the yearly plan is $89.99, compared with $143.88 for twelve months on the $11.99 monthly plan.

Mammouth

• Annual discount

  About 17% off with yearly billing

  Paying yearly lowers Starter from $12 to $10 a month ($120 billed in advance), Standard from $24 to $20 and Expert from $72 to $60.