LLMnesia vs Echoes: AI Chat History Extension Comparison

Echoes and LLMnesia both attack the same problem: answers buried in past AI sessions that native history makes hard to find. They are also both local-first, so this is one of the closer comparisons in the category. Echoes is a fuller management suite with labels, bulk actions, export, and an AI assistant. LLMnesia is a free, local-first Chrome extension that indexes and searches the full text of your conversations across ChatGPT, Claude, Gemini and 10+ platforms, with direct jump-back to the original. The deciding question is whether you want a feature-rich suite whose free tier is now heavily metered, or a focused, unmetered retrieval layer.

LLMnesia vs Echoes at a glance

What Echoes does

Echoes (developed by R2bits, 4.0 stars from 252 ratings, around 9,000 users) is an established, monetised AI conversation manager across 7 platforms. Being an older paid product, it has accumulated a wide feature set:

• Powerful search: fuzzy matching, logical operators (AND, OR, NOT), stemming, scoring, exact match, and "Did you mean" suggestions. The free tier is capped at 20 searches per month.
• Echo AI assistant: a conversational layer that can search and summarise across your history; the Echoes site says the free Lite tier no longer includes Echo AI queries, although its Chrome Web Store listing still advertises 50 free queries a month, so check current terms.
• Labels and organisation: tag and group conversations, up to 5 labels and 10 favourites on the free tier, with unlimited labels on paid tiers.
• Bulk actions and export: act on many conversations at once and pull them out with AI summaries; the free tier allows 10 AI summaries and 5 exports per month.
• Cross-device sync (paid): favourites, labels, and settings sync across devices through Echoes' servers, which requires an account; the listing discloses it collects personally identifiable and authentication information.
• Conversation storage: conversation content itself is stored and processed in your browser.
• Pricing: the free Lite tier with the caps above, Echoes Plus at $8.99 a month, and a $199.99 one-time Lifetime tier; paid plans lift the caps, add unlimited labels, and unlock cloud sync.

That breadth is what you would expect from a mature paid suite. The real question is whether you need those extras enough to pay, sign in, and accept cross-device sync, or whether you just want to find past answers fast.

What LLMnesia does

• Fifteen platforms, one index: ChatGPT, Claude, Gemini, Google AI Mode, Perplexity, Microsoft Copilot, Meta AI, DeepSeek, Grok, Mistral, Kimi, Qwen, Google AI Studio, Character.AI and Z.ai. It also indexes local Claude Code and Codex sessions, which browser-based managers do not reach. Google AI Mode is optional site access.
• Automatic indexing plus one-click backfill: sessions are indexed in the background as you work, with no connect-and-organise step, and on nine platforms you can import the history you had before installing in one go.
• Unmetered full-text search plus semantic search: both run entirely on your device, so you can search by exact keywords or by meaning, with no monthly query cap.
• A search palette on a keyboard shortcut: query every platform at once without leaving the tab you are in.
• Jump-back to the exact message in the live original conversation, not a stored copy.
• Portable backup: export your whole index as JSONL at any time, and clear it whenever you want.
• Local-first and free: the index lives in your browser's storage, with no account and no extra modules to manage.

Where they differ most

Three differences matter more than the rest. First, cost and account. Echoes' best features sit behind a paid plan ($8.99 a month, or $199.99 one-time), and that plan adds an account: you sign in, and its cross-device sync sends your labels, favourites, and settings through Echoes' servers. LLMnesia is free, has no account, and nothing leaves your device. Second, metering. Echoes now meters even the basics on its free tier: 20 searches a month, 10 AI summaries, 5 exports, and no Echo AI assistant queries at all. Unless you upgrade, a heavy week of research can exhaust the free allowance; LLMnesia's full-text search has no such cap. Third, capture model. Echoes is a suite you point at the conversations already in your connected accounts to label, export, and summarise; LLMnesia indexes everything automatically in the background and links each result back to the live original, so there is nothing to file.

On conversation content, both keep the chats themselves local. The privacy line to watch is the paid sync layer: Echoes' cross-device features route metadata through its servers behind a sign-in, while LLMnesia keeps everything, including the index, on your machine with no account at all.

A concrete example

Say you worked out a tricky data-cleaning approach in ChatGPT three weeks ago, then half-revisited it in Claude. With Echoes you would search, from a free allowance of 20 searches a month, and its AI assistant could summarise what you found across both if you are on a paid tier. With LLMnesia you search pandas dedupe approach, get full-text hits from both platforms, and jump straight back into the original ChatGPT session to copy the exact code, no quota involved. Both recover the answer; one bundles AI summaries with a cap, the other is unmetered and lands you back in the source. This is the everyday retrieval covered in the best Chrome extensions to save and search AI conversations.

Can you use both together?

You can, but they overlap on search, so most people pick one. Choose Echoes if you want labels, bulk actions, export, and an AI assistant in a single suite and its free tier's monthly caps, or a paid plan, are fine for you. Choose LLMnesia if you want a lean, free, search-first tool that indexes automatically, never meters search, and gets out of the way.

Choosing between them

Echoes is a better fit if:

• You want a full management suite: labels, bulk actions, export, and AI summaries.
• An AI assistant that summarises across your history is worth a paid tier.
• Seven-platform coverage matches the tools you use.

LLMnesia is a better fit if:

• You want unmetered full-text and semantic retrieval with no monthly limits.
• Automatic background indexing with nothing to organise matters to you, and you want to backfill your existing history in one click.
• You want jump-back to the exact message across 15 platforms, plus local Claude Code and Codex sessions, free.

Want lean, automatic, unmetered retrieval? Install LLMnesia free.