Compare plans

• Free gives you the same answers a Basic subscriber gets, with fewer messages a day. You can open your most recent chat. Earlier chats are kept and appear once you upgrade.
• Basic adds more messages a day and saves every chat and calculation in your sidebar.
• Research finds and cites published scientific papers, reads the full pages behind web results, draws more reference material into each answer, and can lay out two or more compounds side by side or summarize one compound at a glance.
• Frontier answers with ChatPEP's most capable model, reviews more papers and web sources for each answer, and has the highest message limit.

• Answers grounded in cited research, with current sources from the web.
• Reading a web page when you paste its link into a chat.
• Studied protocol timelines, laid out phase by phase with their source.
• Interaction warnings when a compound could clash with a medication you have saved or mentioned.
• The reconstitution calculator.
• A profile ChatPEP remembers, including your goals, conditions, medications, and My Stack.
• Photos and documents attached to a message, within your plan's file limits.

• Prices are in US dollars. Each paid plan is billed monthly or yearly, and you choose which when you subscribe.
• Yearly billing costs about 16% less than paying monthly for a year. You pay for the whole year up front.
• You can subscribe on the web, in the iPhone app, or in the Android app, at the same prices. A plan belongs to your account, so it applies everywhere you sign in, wherever you bought it.
• Some accounts are offered a free trial. When yours is, the plans page says so and each plan's button reads Start 7-day free trial. The checkout shows Due today as nothing and names the day of the first charge. Cancel before that day and you are not charged. An account can have one free trial.
• You can cancel at any time. You keep your plan until the end of the month or year you paid for.

Unlimited messages on Frontier are subject to guardrails against abuse. See Change your plan to upgrade, or the pricing page for the full feature list.