Pastura - Local LLMs simulator
Like stargazing, but for LLMs
About
Observe AI agents interacting in scenarios entirely on your device. Write your own scenarios or use pre-built ones to watch their speech, inner thoughts, and decisions unfold in real-time. It's designed for observation, not direct chat, ensuring your data stays private.
What's New in Pastura
1.3
September 28, 2026
Browse - Tapping a scenario that needs a newer version of Pastura now explains why, with a button to open the App Store Editor - Conditions can now use vote_winner_count, the top vote count from the most recent vote - A warning now appears when an assign phase has fewer items than there are rounds Stability - Fixed a rare crash when opening the simulation screen - Fixed an issue where a turn could be skipped depending on how the AI formatted its reply - Other minor fixes
MoreFAQ
What is Pastura?
Pastura is an application that allows you to observe AI agents interacting within scenarios that run entirely on your iPhone. It focuses on watching their simulated thoughts and actions rather than direct chat.
Does Pastura have ads?
No, Pastura is completely free and does not contain advertisements. It also has no subscription fees or in-app purchases, offering a pure observation experience.
How does Pastura handle privacy?
Pastura runs entirely on-device, meaning no account is required, and none of your data, including scenarios and transcripts, ever leaves your phone. It functions perfectly in airplane mode.
What are the system requirements for Pastura?
Pastura requires a device with 6.5 GB of RAM or more, specifically recommended for iPhone 15 Pro and newer models. The initial LLM download is approximately 3 GB, with Wi-Fi recommended.
Can I create my own scenarios in Pastura?
Yes, you can write your own scenarios using a visual editor or switch to YAML for full control. You can also browse and import scenarios from a curated gallery.
How often is Pastura updated?
The latest version of Pastura is 1.3, last updated on September 28, 2026. This indicates a relatively recent update cycle for the application.
What is the age rating for Pastura?
Pastura has an age rating of 12+. This suggests it is suitable for users aged 12 and above, considering its content and complexity.
What kind of scenarios can I run in Pastura?
You can run built-in scenarios like Word Wolf or Prisoner's Dilemma, create your own, or import from a shared gallery. You can also swap between different local LLMs to see how scenarios change.
