The Letta Insider’s Guide
Everything we know about Letta in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
Letta
The Insider’s Guide
Stateful agents with long-term memory, from the MemGPT team
Every plan, grade, refund rule and rival among AI agents, read from Letta’s own pages.
Made by Letta, Inc. · checked Nov 12, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from Letta’s own pages, its app-store listings and our grades. Every fact in it is on Letta’s page too, where it is kept up to date. Checked Nov 12, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
2.0
GPA, above 64 of the 178 other AI agents we grade
Letta is built by the creators of MemGPT and makes agents that keep memory between sessions and improve with use. The main product is Letta Code, an open-source agent harness run from a command-line tool, plus an Agent SDK for building stateful agents into your own apps. Hosted agents can also run in Slack and other channels.
To get you started, here are 9 things to know about Letta, taken from its own pages and our grades.
No store rating, and the main route is an npm-installed CLI and SDK, so you work from a command line.
- 1
Best for developers building agents that remember across sessions
Letta builds agents that keep memory between sessions, with a free plan, a $20 Pro plan and an open-source coding CLI.
- 2
Paid plans start at $20 a month
As its pricing page puts it: $20 per month.
- 3
There is a free plan
Up to 3 stateful agents and 5 MiB per memory repository; bring your own API keys or an external coding plan.
- 4
It runs on Web
Web.
- 5
Persistent agent memory
Agents are stateful: they carry memory across sessions, and memory repositories are versioned in git so changes can be tracked.
- 6
Letta Code CLI
An open-source harness installed with npm for coding agents, personal assistants and agents that work on local files, with skills and schedules.
- 7
Agent SDK and app server
Developers can embed stateful agents in their own applications, with a self-hosting option and a protocol for external tools.
- 8
A 2.0 GPA, above 64 of 178
That is against the other AI agents we grade, on value, the free plan, features, ease of use and platforms.
- 9
Keep it
To replace Letta you would be making an AI agent, with the models and the safeguards behind it. That is not a weekend's work, with an AI app builder or without one.
Letta at a glance
- Pricing
- Free plan, from $20 per month
- Free plan
- Yes
- Free trial
- None stated
- Runs on
- Web
- Made by
- Letta, Inc.
- Category
- AI Agents
- Our grade
- 2.0 GPA, fair
The report card
Best for developers building agents that remember across sessions
Letta builds agents that keep memory between sessions, with a free plan, a $20 Pro plan and an open-source coding CLI. The free plan includes no model usage, so you bring your own keys, and the pricing page says heavy coding use can run $100 to $200 a month or more.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | C | Pro is $20 a month with $20 of credits, around the category's $21 middle. Teams Pro is $20 a seat. |
| Free plan and trial | C | Free covers 3 stateful agents but no model usage, so you bring your own keys or buy credits. |
| Features | C | Persistent memory, a coding CLI, an SDK, and Slack and GitHub channels. Memory repositories are capped at 5 MiB on Free, and web search and tools spend credits. |
| Ease of use | D | No store rating, and the main route is an npm-installed CLI and SDK, so you work from a command line. |
| Platforms and integrations | B | Web plus a CLI and SDK, with Slack, GitHub, Telegram, Discord, WhatsApp and Signal channels. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who Letta is for
- Fits if you are a developer who wants agents that keep their memory between runs
- Works for people who already pay for a coding plan and can bring that key
Who it is not for
- Tight if you stay free, because there is no included model usage and 3 agents is the cap
- Pricey if you code heavily, as the pricing page says $100 to $200 a month or more of usage
- Watch out: server tool time is billed at $0.00015 a second against your credits
- Watch out: more than one person needs Teams Pro, since Pro covers a single user
Good to know
Good for
- Developers building agents that need memory across sessions
- Coding-agent users who already pay for ChatGPT or another coding plan
- Teams that want shared agents with permissions
Worth knowing
- The free plan has no included model usage; you bring your own keys or buy credits.
- Credits are spent by model usage at provider-based rates, and the pricing page says heavy coding use can run $100 to $200 a month or more.
- Server-side tool time is billed at $0.00015 per second against credits, and web search and fetch tools also cost credits.
- Adding members to an organization needs Teams Pro; Pro covers a single user.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
$20
A month to start. There is a free plan too
Letta has a free plan. Paid plans start at $20 per month.
Free
$0
per month
Up to 3 stateful agents; no included model usage, so bring your own keys or buy credits.
Pro
$20
per month
Includes $20 of credits a month for any model and remote sandboxes, up to 20 stateful agents.
Teams Pro
$20
per seat / month
Everything in Pro, plus teammates in an organization, shared agents and access control.
Enterprise
Custom
Volume-based pricing with role-based access control, SAML/OIDC SSO and dedicated support.
The free plan
Up to 3 stateful agents and 5 MiB per memory repository; bring your own API keys or an external coding plan.
Read from docs.letta.com on Nov 12, 2026.
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Web
Stateful agents with long-term memory, from the MemGPT team. Here is what it does, as its own site describes it, and what it covers: open source, public API, AI features, workflow automation, AI agents.
Persistent memory, a coding CLI, an SDK, and Slack and GitHub channels.
- Persistent agent memory
- Agents are stateful: they carry memory across sessions, and memory repositories are versioned in git so changes can be tracked.
- Letta Code CLI
- An open-source harness installed with npm for coding agents, personal assistants and agents that work on local files, with skills and schedules.
- Agent SDK and app server
- Developers can embed stateful agents in their own applications, with a self-hosting option and a protocol for external tools.
- Channels and cloud agents
- Cloud-hosted agents connect to Slack and a GitHub integration; the channels guide also lists Telegram, Discord, WhatsApp and Signal.
- Bring your own keys
- All plans accept your own model API keys, and usage then goes through your provider account instead of using Letta credits.
Where it runs
- Web
What it works with
- Slack
- GitHub
- Telegram
- Discord
- Signal
Letta is made by Letta, Inc.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
64/178
Other AI agents it is graded above
Letta's GPA of 2.0 is higher than 64 of the 178 other AI agents we grade, and level with 16.
It stands best on platforms and integrations (B, above 47 of 178) and worst on ease of use (D, above 0).
Its paid plans start at $20 a month, against a middle price of $25 for the category: 29 of the 98 others that charge start lower.
On features, ease of use and platforms it scores 2.0 out of 4. 26 tools score higher and cost less.
Each grade against the category
Every bar is all 179 AI agents we grade, cut by the letter each got. Letta’s own letter is outlined.
- CValue for moneyAbove 28 of 178
- CFree plan and trialAbove 64 of 178
- CFeaturesAbove 2 of 178
- DEase of useAbove 0 of 178
- BPlatforms and integrationsAbove 47 of 178
Price against what you get
Each dot is one of 109 AI agents. Further left costs less; higher up scores better on features, ease of use and platforms. Letta is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
Keep it
To replace Letta you would be making an AI agent, with the models and the safeguards behind it. That is not a weekend's work, with an AI app builder or without one.
It costs $240 a year. Letta is open source, so there is a third way: take its code and run it yourself.
What you could not
- An AI agent, with the models and the safeguards behind it.
- Connections to other products, each kept working as those products change.
What this rests on. Letta’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
Mem0, CrewAI, OpenHands, Hermes Agent and Mastra
The 5 tools Letta is most often weighed against, with where each one differs from it.
- 2.6GPA
Mem0
Free plan
Memory layer that lets AI agents remember across sessions.
- Mem0 is self-hostable, according to its own site.
- Letta also covers workflow automation.
- 2.2GPA
CrewAI
Free plan
Multi-agent platform to build, run and govern AI agents.
- CrewAI also covers no-code.
- 2.4GPA
OpenHands
Free plan · from $500/mo
Open-source platform for AI coding agents and automations.
- OpenHands is self-hostable, according to its own site.
- 2.8GPA
Hermes Agent
Free plan · from $20/mo
Open-source AI agent with persistent memory and a messaging gateway.
- Only Hermes Agent lists macOS, Windows and Linux apps.
- Hermes Agent is self-hostable, according to its own site.
- Hermes Agent also covers chat assistant.
- 2.8GPA
Mastra
Free plan · from $25/mo
TypeScript framework for building and running AI agents.
- Mastra is self-hostable, according to its own site.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
13
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is Letta free?
Letta has a free plan. Up to 3 stateful agents and 5 MiB per memory repository; bring your own API keys or an external coding plan.
How much does Letta cost?
Letta lists 4 plans. Free: $0 per month.
What platforms does Letta work on?
Letta is available on Web.
Does Letta have an Android app?
No Android app was listed when its pages were read on Nov 12, 2026. Letta is listed for Web.
Does Letta have an iPhone app?
No iPhone app was listed when its pages were read on Nov 12, 2026. Letta is listed for Web.
Is Letta open source?
Yes. Letta is open source, according to its own site.
Does Letta have an API?
Yes. Letta offers a public API, according to its own site.
What does Letta integrate with?
Letta's listing names Slack, GitHub, Telegram, Discord, WhatsApp and Signal.
Who makes Letta?
Letta is made by Letta, Inc.
What are the alternatives to Letta?
The closest alternatives to Letta in our directory are Mem0, CrewAI, OpenHands, Hermes Agent and Mastra.
How does Letta compare with other AI agents?
Letta's GPA of 2.0 is higher than 64 of the 178 other AI agents we grade, and level with 16.
Is Letta good value for money?
ToolGPA grades Letta C for value for money. Its paid plans start at $20 a month, against a middle price of $25 for the category: 29 of the 98 others that charge start lower.
Could I make my own version of Letta?
To replace Letta you would be making an AI agent, with the models and the safeguards behind it.
Where this guide comes from
The prices, plans, platforms and features were read from Letta’s own pages on Nov 12, 2026, and the grades were given on Nov 12, 2026. Graded from this listing, whose facts were read from Letta's own pages on 12 November 2026. Not based on using the product, and shorter than our full reviews.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by Letta, Inc. Prices change, so check letta.com before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
7,721
Tools graded, in 95 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
7,721
tools graded
95
categories
739
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- Letta, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/letta
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "Letta: The Insider's Guide", checked Nov 12, 2026. https://toolgpa.com/tools/letta
Know someone choosing between AI agents?
Send them this guide: toolgpa.com/tools/letta/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded AI agents after Letta, each with an Insider's Guide of its own.
- AI Agents Insider's GuideEvery one of the 179 AI agents we grade, compared
- Genspark Insider's GuideAI workspace with an agent for research, slides, sheets and docs3.2 GPA
- Manus Insider's GuideGeneral AI agent for research, slides, websites and browser tasks3.2 GPA
- OpenClaw Insider's GuideOpen-source personal AI agent you run yourself and message in chat3.2 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what Letta’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Letta is a trademark of its owner, and this guide is not made, paid for or approved by Letta, Inc. Prices and plans change: check letta.com before you buy.